Journal of Threatened Taxa |
www.threatenedtaxa.org | 26 September 2020 | 12(13): 16715–16735
ISSN 0974-7907 (Online) | ISSN 0974-7893
(Print)
doi: https://doi.org/10.11609/jott.6524.12.13.16715-16735
#6524 | Received 04 August 2020 | Final
received 07 September 2020 | Finally accepted 17 September 2020
A history of primatology in India
(In memory of Professor Sheo Dan Singh)
Mewa Singh 1, Mridula Singh 2, Honnavalli
N. Kumara 3, Dilip
Chetry 4 & Santanu
Mahato 5
1,5 Biopsychology Laboratory,
Institution of Excellence, Vijnana Bhavan, University of Mysore, Manasagangothri,
Mysuru, Karnataka 570006, India.
1 Zoo Outreach Organization, No.
12, Thiruvannamalai Nagar, Saravanampatti
- Kalapatti Road, Saravanampatti, Coimbatore,
Tamil Nadu 641035, India.
2 Department of Psychology, Maharaja’s
College, University of Mysore, Mysuru, Karnataka 570005, India.
3 Salim Ali Centre for Ornithology
and Natural History, Anaikatti P.O., Coimbatore,
Tamil Nadu 641108, India.
4 Aaranyak, 13 Tayab
Ali Byelane, Guwahati, Assam 781028, India.
1 mewasinghltm@gmail.com
(corresponding author), 2 mridulasingh15@gmail.com, 3 honnavallik@gmail.com,
4 dilip.aaranyak@gmail.com, 5 santanumahato94@gmail.com
Editor: Anonymity
requested. Date of publication:
26 September 2020 (online & print)
Citation: Singh, M., M. Singh, H.N. Kumara, D. Chetry & S. Mahato (2020). A history of
primatology in India (In memory of Professor Sheo Dan
Singh). Journal of
Threatened Taxa 12(13): 16715–16735. https://doi.org/10.11609/jott.6524.12.13.16715-16735
Copyright: © Singh et al. 2020. Creative Commons Attribution
4.0 International License. JoTT allows unrestricted use, reproduction, and
distribution of this article in any medium by providing adequate credit to the
author(s) and the source of publication.
Funding: SERB Distinguished
Fellowship (Award Number:
SB/S9/YSCP/SERB-DF/2018(1)).
Competing interests: The authors
declare no competing interests.
Author details: Mewa Singh is a
renowned wildlife biologist at University of Mysore with over 45 years of
research experience on Indian wildlife, especially primates. His interests are ecology, animal behavior
and conservation management. He has
trained a generation of students who are now excelling in many institutions all
over the world. Mridula Singh is a PhD in animal behavior and
teaches psychology at Maharaja’s College, University of Mysore. She carried out a long-term field study on
maternal parental investment patterns in relation to dominance hierarchy in
Lion-tailed Macaques in the Anamalai Hills. H.N. Kumara is
principal scientist at Salim Ali Centre for Ornithology and Natural
History. His research interests
encompass a large variety of taxa and topics in ecology, behavior and
conservation. He initiated the first
long-term studies on the Nicobar Long-tailed Macaques. Dilip Chetry is a senior biologist with
Aaranyak and carries out conservation research and
action for wildlife, especially primates, in northeastern India. He also trains people in ecological research
through various workshops and training programs. Santanu Mahato is a researcher at the
University of Mysore and will be starting long-term studies on primates in the Anamalai Hills soon.
Author contribution: Mewa Singh conceptualized the article
and other authors contributed to literature search and helped in article
preparation.
Acknowledgements: Mewa Singh acknowledges the Science and
Engineering Research Board, Government of India for the award of a SERB
Distinguished Fellowship (Award Number: SB/S9/YSCP/SERB-DF/2018(1)) which also
supports Santanu Mahato. The authors acknowledge the assistance of Sayantan Das in preparing the figure in the article.
Abstract: India harbors
a wide diversity of primates with 24 species that include lorises, macaques,
langurs and gibbons. Systematic research
on the primates in India started about 60 years ago. In order to develop a historical perspective,
we recognize three broad phases of primate research: largely natural history
and base line research, primarily behavioral ecology
research, and increasingly question and hypothesis-driven research. We describe the old and the recent primate
research in the country and suggest research areas for the future.
Keywords: Gibbon, Indian primates,
langur, loris, macaque.
Introduction
India is home to at least 24 species of nonhuman
primates that include two species of lorises, 10 species of langurs, 10 species
of macaques, and two species of small apes, with several of them being
threatened or vulnerable (Table 1) (Molur et al.
2003). Several species including the
Slender Loris, Bonnet Macaque, and Assamese Macaque also have distinct
subspecies making India very rich in primate taxa. Due to this diversity, research in
primatology in India has made prominent strides. Although in the past, many researchers came
to India from other countries and carried out pioneering studies on different
primate taxa, most of the published research on Indian primates today is by
Indian scientists, unlike in many other habitat countries. At a conference organized by the Association
of Indian Primatologists, a group recently established by young primatology
researchers, at Bengaluru in 2019, one of us (Mewa
Singh) delivered the inaugural address on the development of primatology in
India, and was surprised to know that many young scholars had not even heard
the names of many of the pioneers. This
fact motivated us to prepare this article so that the historical information is
made available at one source before such valuable information becomes
inaccessible or is forgotten. This will
also provide a historical perspective for the development of primate research
in India. Primates have been used in a
wide variety of research in India.
Classical paleontological and evolutionary studies have been carried out
by S.R.K. Chopra and Ashok Sahni at Panjab
University, Chandigarh. Research on
primate physiology has been carried out by N.K. Lohia
at University of Rajasthan, Jaipur, by N.R. Moudgal,
M.R.N. Prasad, N. Ravindranath and Polani B. Sheshagiri at the
Indian Institute of Science, Bengaluru, and by scientists at the National
Institute for Research in Reproductive Health, Mumbai. At the Indian Institute of Science, Aditya
Murthy studies neurophysiology of primates and Praveen Karanth
works on primate taxonomy. In addition,
primates have also been employed for biomedical research at the Central Drug
Research Institute, Lucknow, National Institute of Nutrition, Hyderabad,
National Institute of Virology, Pune, Post Graduate Institute of Medical
Education and Research, Chandigarh, National Institute of Immunology, and All
India Institute of Medical Sciences, New Delhi.
In this article, however, we will focus only on research on primates in
their natural habitats concerning ecology and behavior.
As it could probably be true for primatology globally,
we recognize three phases of primatology research in India to develop a
historical perspective. These include: a largely, natural history and baseline
research; primarily behavioral ecology research; and
increasingly question and hypothesis driven research. It must, however, be made clear that these
are not strictly discrete phases as all types of research have been carried out
at all times, but it is only a working time frame to trace the research
perspectives and developments. Further,
since there has not been any institution in the country with the primary focus
on primate research and conservation, most research has been individual
initiatives scattered across different institutions. In this review, therefore, we will primarily
refer to Ph.D. theses and only few references, and website(s) wherever
available, of each researcher since the total number of references on Indian
primates number in thousands. This will
help readers to find other publications of the same researchers. To our knowledge, we have included all Ph.D.
theses written on primates in India, either by an Indian or by foreign
researchers. We clarify that this
article is not a critical review of the contributions of Indian primatology,
which remains another topic to work on, but a repository of information on the
subject. It is, however, more than an
annotated bibliography as the contributions of all the scientists are discussed
briefly. A brief timeline of crucial
developments in Indian primatology is illustrated in Figure 1.
A LARGELY NATURAL HISTORY AND BASELINE RESEARCH
Although a few short articles on Indian primates in
their natural habitats were published earlier (McCann 1933; Nolte 1955), it was
only in the late 1950s and early 1960s that systematic and relatively long-term
studies were taken up. The main emphasis
in those studies was on the natural history of the study species, and these
descriptive studies provided a baseline for further research. The researchers, therefore, focused on the
species rather than on specific research questions. The pioneers of that era are Charles H.
Southwick, Phyllis Jay Dolhinow, Paul E. Simonds, Yukimaru Sugiyama, and Sheo Dan
Singh.
Charles H. Southwick
Although short descriptions of the behavor
of Rhesus Macaques and Hanuman Langurs were published before 1959 (McCann 1933;
Nolte 1955), the first long-term field study on the distribution, population
status, ecology and behavior was undertaken by
Charles H. Southwick (https://neurotree.org/neurotree/publications.php?pid=56382&searchstring=&showfilter=all). Southwick conducted his studies from 1959 to
60 in Uttar Pradesh and in 1962 in West Bengal.
The results of the surveys conducted on the Rhesus Macaque populations
in 280 villages, 30 towns, and 200 Hindu temples revealed that 16% villages,
69% towns and 6% Hindu temples had Rhesus Macaques (Southwick et al. 1961a), and
406, 37, 84 and seven groups of macaques were located along roadsides, canal
banks, railroads, and forest areas, respectively (Southwick et al.
1961b). The first detailed study on the
ecology and behavior of the Rhesus Macaque was
published in 1965 (Southwick et al. 1965). The group size was 15.1 individuals with an
average of 3.5, 6.9, 3.8, and 0.9 adult males, adult females, infants, and
juveniles, respectively. The study found
a clear inter-group and within-group hierarchy and peaceful to violent inter-individual
relationships. This study also laid
foundations for further research in ecology and behavior
of Rhesus Macaques. Southwick maintained
his research collaborations with Indian primatologists and continued to publish
on population trends in Rhesus Macaques until 2001 (Malik et al. 1984;
Southwick & Siddiqi 1966, 1977, 1988, 2001).
Phyllis Jay Dolhinow
Though there were reports about the taxonomy of
Hanuman Langurs, the first comprehensive field study on the demography, ecology
and behavior of this species was published in 1965 by
Phyllis Jay (Jay 1965, later known as Dolhinow,
P.J.). Jay conducted an 18-month field
study between October 1958 and April 1960 at Orcha, a
small village close to a forest in Madhya Pradesh, and Kaukori,
a village among agricultural lands in Uttar Pradesh. The two habitats of langurs varied with
respect to availability of forest, food items of langurs, human density and
human interactions, interactions with other primates and forest dwelling
mammals including predators. The groups
were largely bisexual with 1.5 to 2 adult females per male, but there were also
all-male groups. The groups remained
relatively stable. Activity peaked
during dawn and dusk. The home ranges of
the groups averaged from 1 to 3 square miles.
The social interactions were usually peaceful and relaxed. There were no overt dominance interactions
and activities such as grooming could occur for over five hours per day. The infants and juveniles were found to
undergo a fairly long process of socialization.
Jay also provided a detailed ethogram of langurs describing a multitude
of gestures and vocalizations used by various age-sex classes. Dolhinow also
carried out a survey on Rhesus Macaques from 1964 to 1965 covering 9,510 kilometers in rural and forest areas, and found one group
per 11.6km in forests and 32.8km in rural areas (Dolhinow
& Lindburg 1978).
Paul E. Simonds
After a short-term study by Nolte (1955), the first
detailed study on the behavior of Bonnet Macaques was
published by Simonds (1965). Paul
Simonds (https://anthropology.uoregon.edu/profile/simonds/) conducted his study
on Bonnet Macaque between October 1961 and June 1962 on the Mysore-Ooty road near Bandipur
forests. The group size of Bonnet
Macaques varied from >10 to 40–60 individuals. Simonds described the macaques as gregarious
and spending much time in grooming and play.
Hierarchies within the group were found to be subtle. Females indulged in promiscuous mating with
extreme male tolerance. Groups had
overlapping home ranges. Simonds later
visited India in 1963, 1970, and 1975 for subsequent research. Simonds (1965) became a base line for
subsequent studies on Bonnet Macaques.
Yukimaru Sugiyama
A contemporary of Phyllis Jay Dolhinow
was Yukimaru Sugiyama (https://www.researchgate.net/profile/Yukimaru_Sugiyama)
from Kyoto University, Kyoto who conducted studies on Hanuman Langurs and
Bonnet Macaques in Dharwad from April 1961 to April 1963. Dr. D. Miyadi, Kyoto University, Kyoto was the project director
and the Indian collaborator was Dr. M.D.
Parthasarathy from Central College, Bangalore.
Sugiyama reported the social structure of one-male groups and instances
of infanticide in Hanuman Langurs for the first time and proposed that such a
pathological behavior could be due to high population
densities, and could occur to induce estrus in
females (Sugiyama 1964, 1965, 1966). The
process involved ousting the dominant male and other males of a langur group by
an outside male who took over the group, and the ousted males formed an
all-male group. He also carried out
short-term studies on Lion-tailed Macaques (Sugiyama 1968) and Bonnet Macaques
(Sugiyama 1971) during the afore-mentioned period. Later, Sugiyama made several visits to India
in 1972–73 to study Himalayan langurs (Sugiyama 1976) and Rhesus Macaques, and
in 1976, 1978, and 1997 to study Hanuman Langurs (Sugiyama 1984).
Sheo Dan Singh
When these field studies were going on in the 1960s,
there was also experimental work carried out on Rhesus Macaques at the Department
of Psychology, Punjab University, Chandigarh by Sheo
Dan Singh that resulted in some exceptional findings which unfortunately have
not found much mention in later literature on Indian primates. Singh captured monkeys from urban and forest
environments and studied behavioral differences
between them under laboratory conditions.
When presented with novel stimuli, the urban monkeys were far more
active and manipulated presented objects more than the forest monkeys (Singh
& Manocha 1966) and were more responsive to
stimuli of higher complexity (Singh 1968).
Urban monkeys were more aggressive than forest monkeys whereas forest
monkeys groomed more often than urban monkeys (Singh 1969). The urban and forest monkeys, however, did
not differ in their problem-solving capabilities (Singh 1969) indicating that
whereas the selection pressures of an urban environment have shaped many new
adaptive patterns in urban monkeys, the basic intelligence does not seem to be
affected. S.D. Singh was invited to head
the Psychology Department at the newly established university at Meerut in
1971. At Meerut, he continued laboratory
experiments on Rhesus Macaques primarily on selective lobectomy and learning,
and also started experimental studies on these macaques in their natural
habitats in Siwalik Hills in the Asarori Range
forests near Dehradun. The Rhesus
Macaque infants were separated from their mothers shortly after birth and were
reared in social isolation and in peer-groups of six monkeys each. There were also mother-infant pairs in these
experiments. The idea behind these
experiments was to study the contribution of mothers, peers, and the group on
the behavioral development of infant monkeys. Infants raised in peer groups when separated
from others showed disturbed behaviors including
‘protest’ and ‘despair’ (Singh 1977).
When these infants were exposed to strangers, they reacted aggressively
just like the Rhesus Macaques in their natural groups (Singh 1980). S.D. Singh passed away on 26 June 1979 when
he was less than 50 years old. The
students trained by him continued their work and three of them, Waheeda Khan, Kiran Lata, and Suraj Bhan,
submitted their theses under B.S. Gupta at Meerut. Waheeda Khan (Khan
1980) studied the effect of urban environment on social, emotional, and
curiosity behaviors in Rhesus Macaques at different
age levels. The urban monkeys were more
aggressive whereas the forest monkeys were shy and timid. Urban monkeys also needed high levels of stimulation
to satiate their curiosity. The same
urban and forest monkeys were studied by Kiran Lata (Lata 1980) for development
of cognitive behaviour. Environmental
enrichment showed no effect on delayed response learning, object discrimination
learning set, and oddity discrimination learning; however, the forest monkeys
were slower to adapt to experimental situations than the urban monkeys. The above two studies were carried out in the
Primate Laboratory at Meerut University.
A field study carried out by Suraj Bhan (Bhan 1983) on the development of behaviour in Rhesus
Macaque infants found developmental trends in play and social interactions at
different age blocks, with male infants and juveniles being more playful than
females. N.K. Chandel
(Chandel 1981), though trained at Meerut, submitted
his thesis at the University of Rajasthan, reported that patterns of
affiliative behaviors in adult and adolescent Rhesus
Macaques changed with age and mating season.
Rajbir Singh (Singh 1981), who also went to Rajasthan from Meerut,
reported that in free-ranging Rhesus Macaques, the social interactions among
group members are not random but patterned by age, sex, and relative dominance
in the social hierarchy.
Two other students of S.D. Singh, Raghubir
Singh Pirta and Mewa Singh,
made their careers in primatology and established many milestones in Indian
primate research later. Pirta did his Ph.D. at Kashi Vidyapith University, his
post-doctoral research at Utkal University, and later
worked in Himachal Pradesh University till his retirement. Mewa Singh did his
Ph.D. at the University of Mysore and continues to work there as Professor (for
Life) (The works of Pirta and Singh are discussed in
later sections).
PRIMARILY BEHAVIORAL ECOLOGY RESEARCH
This was the phase when baseline data were available
on some Indian primates and researchers could now look at the ecology and behavior of their study species in greater detail. The approach still was primarily
species-oriented.
Donald G. Lindburg
D.G. Lindburg came to India
to study Rhesus Macaques in 1964. Of the
21 months that the study lasted, the first nine months were devoted to a field
survey on Rhesus Macaques under the leadership of Phyllis Jay Dolhinow and during the remaining 12 months, Lindburg carried out an ecological and behavioral
study of Rhesus Macaque at Asarori Forest, Siwalik
Hills, at the Forest Research Institute, near Dehradun (Lindburg
1971). Prior to this study, only a few
experimental studies were carried out on the behavior
of Rhesus Macaques by S.D. Singh (cited earlier) and Lindburg’s
was the first account of Rhesus Macaque behavior from
its natural habitats. The Rhesus Macaque
is the most widespread non-human primate from 200E in Afghanistan to
1200E in China, and from 180N in India to 400N
in China. The habitat occupied by the
species included Sal Shorea robusta dominated deciduous forest and the area was
heavily grazed by domestic buffaloes.
The mean group size was about 32 though it varied significantly from one
habitat type to another. The groups were
bisexual with adult male to female ratio being about 1:3 and the reproductive
rate was about 90%. The home range of a large group was approximated to 15km2. The Rhesus Macaque is largely frugivorous but
occasionally feeds on insects and grasshoppers.
Lindburg also provided detailed information on
intergroup interactions, social behavior, and social
organization and his article became the general reference for later research on
the ecology and behavior of Rhesus Macaques. Lindburg continued
his association with Indian primatologists (Singh et al. 1999) and also carried
out conservation breeding of Lion-tailed Macaques at San Diego Zoo, San Diego,
USA.
Frank E. Poirier
Frank E. Poirier
(https://anthropology.osu.edu/people/poirier.1) studied Nilgiri
Langurs in the Nilgiri Hills between September 1965
and August 1966. This was the time when
base line studies were already published on many Indian primates, and Poirier
advanced the research to finer details of ecology and behavior. He published several articles in various journals
from 1966 to 1970 but a detailed single report on the Nilgiri
Langur was published in 1970 (Poirier 1970).
The Nilgiri Langurs are distributed in the
southern Indian states of Kerala, Tamil Nadu, and Karnataka. The home ranges of Nilgiri
Langur groups overlapped with Bonnet and Lion-tailed macaques and occasionally
with Hanuman Langurs, and varied from ¼ to 1 square mile. The average group size was 8–9 individuals in
bisexual groups, and solitary and uni-sex male groups
were also observed. The main food of Nilgiri Langurs were leaves, flowers, buds, seeds, and bark
or stem. Poirier also reported other behaviors including social communication, dominance
hierarchies, grooming, and play in detail.
This report, therefore, provided an excellent background for analytical
studies later.
Suraj Mal Mohnot
Though there were a few Indian primatologists
including M.A. Beg, M.R. Siddiqi, M.D. Parthsarathy,
and H. Rahman who carried out field work with the previously-mentioned foreign
scientists, the first independent field study in India was undertaken by S.M. Mohnot at Jodhpur University. Mohnot started
studying Hanuman Langurs near Jodhpur in 1965, obtained his Ph.D. in 1974 and
became a faculty member at the Department of Zoology at Jodhpur
University. In the years since then, Mohnot has carried out many long-term studies on primates,
guided several Ph.D. students, hosted many foreign scholars, and made Indian
primatology known to the world over. The
duo of Roonwal and Mohnot
also published the first comprehensive book on primates of South Asia (Roonwal & Mohnot 1977). The
langur population near Jodhpur is unique in many ways, it is an isolated population since hundreds
of years with no distribution of any other primates up to at least a hundred kilometers. The
rocky and open nature of the region allows close day-long observations
throughout the year (Mohnot 1984). The basic social system, social changes, and
infant-killing were reported in the Jodhpur langurs (Mohnot
1971; Makwana 1979a). (More details on Mohnot’s work
will come later along with his students and collaborators).
Steven Green, Karen Minkowski,
John F. Oates, Rauf Ali, and Jayashree Ratnam
Steven Green and Karen Minkowski
(http://www.momentum2.miami.edu/donors_steven_green.html) from Rockefeller
University collaborated with the Bombay Natural History Society to carry out a
long field study lasting 19 months from September 1973 to April 1975 on the
Lion-tailed Macaque at Ashambu Hills in Tamil
Nadu. Except for a short term study by
Sugiyama (1968) and Karr (1973), nothing was published about the ecology and behavior of Lion-tailed Macaques till 1977 (Green & Minkowski 1977).
Surveys by Green & Minkowski revealed that
there were about 405 Lion-tailed Macaques in the wild in the states of Karnataka,
Tamil Nadu, and Kerala. The Lion-tailed
Macaque is an obligate rainforest dweller and primarily arboreal. The average group size is about 15
individuals. Sexual maturity in females
is attained at about five years of age and very few infants are produced by a
female in her lifetime. The primarily
fruit diet of the species is supplemented with insects. Green & Minkowski
also initiated long-term conservation plans for the endangered Lion-tailed
Macaque. Green offered a post-doctoral
fellowship to John F. Oates (https://anthropology.commons.gc.cuny.edu/john-f-oates/)
to continue research on the Lion-tailed Macaques. The conservation initiatives taken up by
Green & Oates finally resulted in a large area in Kalakad-Mundanthurai
being maintained as a reserve primarily for the Lion-tailed Macaques (Sekhsaria 2015).
Oates, however, shifted his focus to the Nilgiri
Langur and commented on its geographical distribution and status (Oates 1979),
and reported that most food items of the Nilgiri
Langur had low fibre and condensed tannin content but the staple food items
were highly digestible (Oates et al. 1980).
As John Oates took over from Steven Green, Rauf Ali
(https://www.feralindia.org/user/78) came to Kalakad-Mundanthurai
to take over from John Oates. Ali was
registered for Ph.D. at the University of Bristol With John Crook (Ali 1981)
and reported for the first time that in the subspecies of Bonnet Macaques that
he was studying at Agastyamalai, it was the females
that emigrated and dispersed between the groups, a behavior
not known in the other subspecies of the Bonnet Macaque or most other macaque
species. Ali also observed that at the
time of intergroup encounters, there was also heightened within-group
aggression that he explained as the group males trying to prevent the females
from crossing over to the opposite group.
Years later, following Rauf Ali, Jayashree Ratnam
(https://www.ncbs.res.in/mscprogram/program-management) arrived at the Mundanthurai forests to study Bonnet Macaques with a more pointed
question about the foraging decisions in a social forager (Ratnam 2002). Ratnam
analyzed foraging decisions in response to
experimentally-induced variations in ecological and social variables. Social dominance determined which individual
fed at a given time, and social rank affected spatial distribution and the
feeding rate of an individual.
Ajith Kumar
Ajith Kumar
(https://www.ncbs.res.in/mscprogram/program-management) carried out a
six-year-long study on the ecology and population dynamics of Lion-tailed
Macaques in the Anamalai Hills and received his Ph.D.
degree from University of Cambridge in 1987 (Kumar 1987). He examined variations in the demographic
parameters and correlates of ecology and behavior. He reported delayed sexual maturity in females,
long inter-birth intervals, low population turnovers but high infant survival
rates. These macaques fed on fruits and
insects. Larger groups had larger ranges than smaller groups. The low birth rate was explained to be due to
high mating interference resulting in suppression of conception in many
females. This study site in the Anamalai Hills became one of the most important centers for wildlife research in subsequent years.
INCREASINGLY QUESTION-ORIENTED AND HYPOTHESIS-DRIVEN
RESEARCH
Although several researchers continued to focus on
particular species, primate research, from the mid 1970s, became increasingly
question-oriented and hypothesis-driven.
Therefore, while discussing this phase of development of primatology
research in India, we will not focus on the research by any individual but by
several institutions where primate research was conducted or is still underway.
Jai Narayan Vyas University, Jodhpur
S.M. Mohnot (Mohnot 1974) established a major primate research program
at Jodhpur where he trained a large number of Indian students and hosted
several researchers from abroad. The
unique Jodhpur population of Hanuman Langurs became a major focus of ecological
research. Sarah Blaffer
Hrdy (Hrdy 1975)
(http://www.citrona.com/hrdy), a graduate student of Irvin DeVore and tutored
by E.O. Wilson and Robert Trivers arrived in Jodhpur
in 1971 and S.M. Mohnot advised her to study Hanuman
Langurs at Mount Abu in Rajasthan.
Infanticide in langurs, reported by Sugiyama and Mohnot,
was just becoming a hot topic in primatology and it was generally being
characterized as a ‘social pathology’ occurring primarily due to
overcrowding. Hrdy
observed many cases of usurping control of different groups of langurs and
instances of infanticide. The females
who lost infants gave birth within 6–8 months after the death of their infants
whereas the normal inter-birth interval was up to about 27 months. Infanticide could also occur in places where
there was no overcrowding. Hrdy, therefore, proposed that infant killing was not a
social pathology but a male reproductive strategy to garner reproductive access
to females. In the years to come, sexual
selection as an explanation for infanticide became the main focus of research
on Hanuman Langurs. In 1977, the Indo-German
project, conceptualized by Christian Vogel, was launched at Jodhpur to study
interrelations between individual life-histories and troop histories (Vogel
1988). This project continued for many
years and sponsored several German researchers who worked on Jodhpur
langurs. These langurs feed on 35
species of plants, and a unique foraging ‘invention’ is feeding on the ‘waternut’ Trapa natans recently introduced to the region. The main food items of a large number of
troops were Prosopis juliflora and the food
provided by humans (Winkler 1981). The
females reached menarche at the age of 29 months, cycled for 24 days, had
gestation of about 200 days, and an inter-birth interval of 15.3 months. About 80% infants survived for six months but
only 35.9% completed two years of life (Winkler et al. 1984). Volker Sommer (Sommer 1985)
(https://www.ucl.ac.uk/anthropology/people/academic-and-teaching-staff/volker-sommer),
a student of Christian Vogel at Gottingen, and hosted by S.M. Mohnot studied the Jodhpur langurs for his Ph.D. between
October 1981 and December 1982, and again as a post-doctoral research fellow in
1986–1987. He witnessed and also
inferred many cases of infanticide and discussed the male reproductive strategy
with respect to three conditions, postulating that the infanticidal male is not
the father of the killed infants, but actually sires the subsequent offspring,
and infanticide shortens inter-birth interval, and found that these conditions
were largely met (Sommer & Mohnot 1985).
Makwana (1979b) studied rhesus monkeys in Asarori, Siwaliks, and reported
group size to vary from 6 to 90 with a male to female ratio of 1:2.7. Home range size varied with group size, and
the daily range was about 1803 m. P.R.
Ojha (Ojha 1979) observed that the tail carriage of the Rhesus Macaque alpha
male with the basal half carried upright, distal part leaning forward and the
tip forming a loop is unique and is not shown by any other member in the group.
The upright posture is usually assumed in tense situations such as intergroup
interactions or alarms. L.S. Rajpurohit (Rajpurohit 1987)
(https://www.researchgate.net/profile/Lal_Rajpurohit2) reported that the ousted
males did not achieve residency in their natal groups and weaned sons follow
their fathers after ousting. Emigrating
males have a higher mortality than females resulting in female-biased sex
ratios. G. Agoramoorthy
(Agoramoorthy 1987) observed several cases of
abortions in Hanuman Langurs happening probably due to stress after male
take-over of a group and conjectured that an abortion may be a female
reproductive strategy to avoid infanticide after the birth of the infant. Since the inter-birth interval in females
whose infants were killed by the new males was shorter than other females, it
appears that the male achieves higher reproductive success by infanticide. Hanuman Langurs are primarily folivorous but were also observed to spend considerable
time feeding on insects, especially during the monsoon season, which supported
the ‘energy/nutrient maximization’ hypothesis (Srivastava 1989). Carola Borries (Borries 1989)
(https://www.stonybrook.edu/commcms/anthropology/faculty-and-staff/borries.php),
a student of Christian Vogel, and hosted by S.M. Mohnot,
studied competition in female langurs of Jodhpur from October 1984 to January
1986. She found that the young females
occupied high ranks, and the hierarchical position of a female declined with
age. Reproductive success was rank
related that declined significantly from high, over middle, to low ranking
females (Borries et al. 1991). In Kumbalgarh Wildlife Sanctuary, there were about 69%
bisexual and about 31% all-male band groups of Hanuman Langurs, and their
social organization was the same as in the Jodhpur langurs (Chhangani
2000) (https://mgsubikaner.ac.in/wp-content/uploads/2015/10/1396502908-2014Faculty_MemberDrAnilKumarChhangani.pdf). D.S. Rajpurohit (Rajpurohit 2005) determined dominance hierarchy and its
role in social organization in Hanuman langurs, and G. Sharma (Sharma 2007)
reported details of paternal care in these langurs. In 1994, S.M. Mohnot
launched a mega research project (Indo-US Primate Project) for a period of five
years, which was further extended by three years. Most of the research under this project was
in northeastern India where Mohnot
collaborated with P.C. Bhattachrjee at Gauhati University, Guwahati. Since most researchers were from the
northeast, we will have a separate section for the research on northeastern Indian primates.
Hanuman Langurs being widespread have also been
studied in different habitats in India.
The Himalayas are a different ecological niche and the Himalayan Hanuman
Langurs, though studied at different altitudes in Indian and Nepalese
Himalayas, exhibit traits such as multi-male groups which are different from
the langurs in the Indian plains that are largely uni-male
(Bishop 1975). Hanuman Langurs in Kanha Tiger Reserve are organized in mostly uni-male groups with an adult sex ratio of 1:7.9. In Kanha, an attack
by a male band on the uni-male study group, resulting
in killing of three infants, and the timing of takeover with respect to the
birth season, supported the ‘sexual selection’ and not the ‘social pathology’
hypothesis (Newton 1984). At Morni Hill ranges of Siwalik Hills, 75% groups of Hanuman
Langurs were uni-male with a sex ratio of 1:3.2, and
these langurs shifted home ranges seasonally (Bala
2013). In Bidar
District of Karnataka, there were 142, 55, and 28 uni-male,
multi-male and all-male groups, respectively, with a total population of 6,384
individuals (Patil 2019). In the six study groups, the population size
of 199 in 2012 increased to 270 in 2014.
University of Delhi and Vatavaran
Several studies were carried out on primates at the
Department of Anthropology, University of Delhi by Praveen K. Seth. Though most of his work was on primate
anatomy (which is beyond the scope of this article), Iqbal Malik
(http://www.vatavaran.org/) and he carried out studies on population trends and
behavior of Rhesus Macaques. The surveys conducted between 1975 and 1980
revealed that in several localities, the population of Rhesus Macaques
increased by 66–79%, mainly due to human-provisioning (Seth & Seth 1983a;
Malik et al. 1984). The populations, however,
showed a declining trend in the later years (Malik 1989). Malik was also involved in translocations of
urban Rhesus Macaques and found that most translocated monkeys appeared to
exhibit normal behavior (Imam et al. 2000).
University of Mysore, Mysuru
Mewa Singh (http://uni-mysore.ac.in/psychology/faculty/dr-mewa-singh)
started research on primates at the University of Mysore in 1975 and has
studied Bonnet, Rhesus, Lion-tailed, and Long-tailed macaques, Hanuman and Nilgiri langurs, and Slender Loris. The group has carried out extensive studies
on the ecology, behavior, and conservation
management, both in situ and ex situ, on primates with over 150 publications
(see https://uni-mysore.ac.in/psychology/faculty/dr-mewa-singh). Long-term field studies were initiated on
Slender Loris (Singh et al. 1999, 2000; Kumara et al.
2006) and other primates (Kumara & Singh 2004) in
various habitats. Population trends in
Bonnet Macaques have been monitored in and around Mysuru for over 30 years
showing a nearly 70% decline in the population (Erinjery
et al. 2017a). Bonnet Macaques showed
laterality in various activities as a division of labor
between the two hands (Mangalam et al. 2014, 2016). Sindhu Radhakrishna (Radhakrishna 2001)
(https://www.nias.res.in/professor/sindhu-radhakrishna) carried out a 21-month-long
study on the Slender Loris in the forests of Dindigul,
Tamil Nadu. Most of the aggressive
interactions among individuals were observed in the contexts of territorial defense and mating; individuals communicated through
chemical and vocal signals, and immigrations were frequently seen in the study
area (Radhakrishna & Singh 2002).
Females were seen to be in estrus largely in
October–December and births occurred in April–June; gestation lasted for 5.5
months and there was an inter-birth interval of seven months (Radhakrishna
& Singh 2004). Anantha
Krishna Sharma (Sharma 2002)
(https://www.researchgate.net/profile/Ananthakrishna_Sharma) studied
reproductive biology of the Lion-tailed Macaques in the Western Ghats and
reported that there were two birth peaks in January to April and in September
to December, which remained constant over the years and across forest fragments
of different sizes (Sharma et al. 2006).
In contrast, births in captive Lion-tailed Macaques occurred throughout
the year. H.S. Sushma (Sushma 2004)
(https://www.sacon.in/adjunct-scientist/) studied sympatric Lion-tailed
Macaques, Nilgiri Langurs, Bonnet Macaques, and
Indian Giant Squirrels and found that both macaque species had relatively
narrow food niche breadth and high niche overlap resulting in co-occurrence of
these species only in a few months of the year.
On the other hand, Nilgiri Langurs had a low
niche overlap with Lion-tailed Macaques and both langurs and squirrels had
broad niches resulting in tolerance and co-occurrence of all three species
(Sushma & Singh 2006). B.A. Krishna
(Krishna 2007) studied maternal and parental investment patterns in Lion-tailed
Macaques and observed that weaning occurs from five and a half months to about
nine months of age of the infant (Krishna et al. 2008) and the weaning patterns
indicated that the dominant females are positively biased towards their male
offspring (Singh et al. 2007). Kuladeep Roy (Roy 2011)
(https://www.researchgate.net/profile/Kuladeep_Roy) also studied sympatric
primates in a different forest and found that though there was a high niche
overlap between Lion-tailed and Bonnet macaques for about two months, it
occurred at the time of resource abundance of the shared resources, and as a
result, both of these macaques species and the Hanuman Langur which is a
folivore, unlike frugivore macaques, could co-exist throughout the year (Singh
& Roy 2011). Kavana
T.S. (Kavana 2015) and Joseph J. Erinjery
(Erinjery 2016)
(https://www.researchgate.net/profile/Joseph_J_Erinjery) studied individual
differences indicating behavioral variability in
macaques (Bonnet and Lion-tailed) and langurs (Nilgiri
and Hanuman), respectively. Behavioral variability was higher in macaques than in
langurs (Erinjery et al. 2017b). The ideal gas model approach showed that
primates in the Western Ghats do not form active associations with each other (Erinjery et al. 2015).
In context to langurs, Hanuman Langurs are more social than Nilgiri Langurs as the latter are more folivorous
and require to spend much time in resting to digest leaves (Kavana
et al. 2015). Prerna Singh (Singh 2017) observed
abandonment of infants by Bonnet Macaque females after a group split, and
reported that weaning may also occur without aggressive responses from mothers.
Matthew Cooper from University of
Georgia studied Assamese Macaques under the supervision of Irvin Bernstein in
1997–98 for his Ph.D. (Cooper 1998) and worked as a post doc in 1999–2001 at
the University of Mysore on dominance style and relationship quality in Bonnet
Macaques (Cooper et al. 2004a,b). Under
the supervision of Clifford Jolly, Lisa Schlotterhausen
(Schlotterhausen 2000)
(https://as.nyu.edu/departments/anthropology/graduate/alumni/doctoral-alumni/schlotterhausen-lisa.html)
from New York University, New York in affiliation with the University of Mysore
reported that wild Bonnet Macaques moved and fed on more food items but engaged
less in social activities than the commensal bonnets. Anna Nekaris (Nekaris 2000) (https://www.brookes.ac.uk/templates/pages/staff.aspx?wid=&op=full&uid=p0029554)
from Washington University, Missouri under the supervision of David Tab
Rasmussen, affiliated with the University of Mysore and observed that the
Slender Loris was exclusively faunivorous feeding on insects and small
vertebrates, and distributed their activity budget evenly between foraging and
travelling. Cornelia Bertsch from
Austria collaborated with the research group and studied Lion-tailed Macaques
from 1998 to 2003 in the Anamalai Tiger Reserve.
National Institute of Advanced Studies, Bengaluru
At NIAS, primate research was initiated by Anindya Sinha (https://www.nias.res.in/professor/anindya-sinha)
and joined later by Sindhu Radhakrishna.
The group has been focusing on primate ecology, behavior,
conservation, and cognition. After
Simonds (1965), Sinha (2001) provided the first detailed description of
distribution, ecology, and behavior of the Bonnet
Macaque. Inarguably the best long-term
field study on behavior of any primate species in
India is Sinha’s research on Bonnet Macaques in Bandipur
National Park, Karnataka, the study now covering a period of two decades. The Bonnet Macaques usually live in bisexual
groups with each group having several adult males and adult females. Sinha, however, found that in Bandipur, 11 of the 21 groups of Bonnet Macaques were uni-male-multi-female groups (Sinha et al. 2005). The origin and evolution of this unique
social organization in the Bonnet Macaque has been explained through a
research-based model illustrating the following process (Sinha &
Mukhopadhyay 2013). In deciduous
forests, food becomes scarce and patchy in the dry season, and at the same
time, tourists passing through the forest offer food which is rich and
clumped. These two factors induce intense
competition among females in a multi-female-multi-male group, leading to group
fission, resulting in small groups of females.
In such a situation, it becomes easier for a single male to monopolize
reproduction, and consequently, the evolution of uni-male
social organization takes place.
Sinha (Sinha et al. 2005) and his group also described
a new macaque species, the Arunachal Macaque Macaca
munzala from the forests of Arunachal
Pradesh. Four students have carried out
their Ph.D. research with Sinha. Rishi
Kumar (Kumar 2012) (https://www.researchgate.net/profile/Rishi_Kumar24)
reported the distribution, demography, and behavioral
ecology of mixed groups of Bonnet and Rhesus macaques in peninsular India and
observed that Rhesus Macaques were extending their range into the range of
Bonnet Macaques, due perhaps to human intervention (Kumar et al. 2011,
2013). Mayukh
Chatterjee (Chatterjee 2013)
(https://www.wti.org.in/members/mayukh-chatterjee/) studied behavioral
flexibility and social diversity in Bonnet Macaques with special reference to uni-male groups.
Ecological differences can cause intra-specific and even
intra-population differences in social systems which, in turn, produce
flexibility and variability in behavioral strategies
such as grooming and proximity. Narayan
Sharma (Sharma 2013) (https://www.researchgate.net/profile/Narayan_Sharma3)
studied effects of habitat fragmentation on primate populations in Upper
Brahmaputra Valley where at least one species was lost in the last 30
years. Many, largely habitat specialist
species, have shown decline in their populations whereas a more commensal and
generalist Rhesus Macaque has become more abundant. Geographical distance, dissimilarity in
spatial features and anthropogenic factors affected turnover in primate species
composition. Shreejata
Gupta (Gupta 2016) (https://www.researchgate.net/profile/Shreejata_Gupta2)
found that Bonnet Macaques produce flexible and intentional gestures with
context variability. Gestures such as
those used in play decrease with age and others such as those related to
aggression and affiliation appear at the adult stage. Females had a higher repertoire of signals
than males. Anindya
Sinha also hosted Avanti Mallapur
(https://www.linkedin.com/in/avanti-mallapur-b9b2a615), a Ph.D. student from
the University of Edinburgh, Edinburgh (Mallapur
2005). Mallapur
studied the effect of visitor presence on behavior of
captive Lion-tailed Macaques and found that the visitor presence might
adversely affect welfare of animals causing an increase in abnormal and other
social behaviors (Mallapur
et al. 2005).
Sindhu Radhakrishna joined NIAS in 2002 and continued
surveys on lorises in northeastern India and
Kerala. In Meghalaya, the Bengal Slow
Loris was found in only two of the 16 sites surveyed and the habitat was found
to be severely affected by anthropogenic activities (Radhakrishna et al.
2010). In Tripura, the encounter rate of
the Slow Loris was 0.22 individuals (Swapna et al. 2008). The Slender Loris was found in 22 of the 36 forest
ranges surveyed in Kerala with an abundance ranging from 0.02 to 1.44
individuals/km (Radhakrishna et al. 2011).
She is also tracing human-monkey relationships in literature and
folklore (Radhakrishna 2018). Asmita Sengupta (Sengupta 2015) (https://www.atree.org/users/dr-asmita-sengupta)
studied seed dispersal as an ecosystem function by Rhesus Macaques in Buxa Tiger Reserve in 2012–2014. Macaques dispersed 84% of the 49 species they
fed on. The macaque-handled seeds were
largely deposited outside the tree canopy, were undamaged and had enhanced
germination. Provisioning reduced the
daily range of macaques and resulted in lesser seed dispersal than in unprovisioned macaque group. Shaurabh Anand
(Anand 2019) (https://www.researchgate.net/profile/Shaurabh_Anand3) studied
perceptions about human-Rhesus Macaque conflict in Himachal Pradesh. Whereas higher level forest officers proposed
strict rules for management of negative interactions, the lower level officers
agreed more with the farmers who actually suffered losses. Forest officers believed that sterilization
and culling of monkeys were the effective interaction resolution measures, the
farmers found these ineffective and against cultural and religious beliefs. Therefore, there appears to be higher
human-human conflict than human-animal negative interactions (Anand &
Radhakrishna 2020).
Northeastern India and Gauhati
University
Northeastern India is an extremely rich region for primate
diversity with 13 of the 27 Indian primate species including loris, macaques,
langurs, and small apes found there.
Until the early 1980s, virtually nothing was known about these primates
in northeastern India. Anwaruddin
Choudhury (Choudhury 1989) (https://en.wikipedia.org/wiki/Anwaruddin_Choudhury)
was the first person to begin primate research in northeastern
India in 1986 when he reported that the Pig-tailed and the Stump-tailed
macaques were restricted by the Brahmaputra River towards west of their
range. He also discovered a new
population of macaques which he described as a subspecies of Macaca thibetana
but the same has now been described as a new species with the name Macaca munzala.
In one of the earlier studies conducted in 1987–1991
on the Golden Langurs (Dutta 1992), it was found that they were confined to the
northwestern belt of Assam. The group had 7–13 individuals and shifted
the home range seasonally. They fed on
flowers, blossoms, leaves and fruits of 34 plant species. Atul Kumar Gupta (Gupta 1997)
(http://tdu.edu.in/governance/akgupta/) observed that due to continuing loss of
forests, primate populations in northeastern Indian
region were being adversely affected.
Although a few field studies were carried out in the
1980s and 90s, it was in 1994 that long-term studies on several primate species
in northeastern India were initiated under the
Indo-US Primate Project with S.M. Mohnot of J.N.V.
University, Jodhpur and P.C. Bhattacharjee of Guwahati University as the
principal investigators. Prabal Sarkar
(Sarkar 2000) (https://www.ustm.ac.in/zoology-list-of-faculties/dr-prabal-sarkar/)
reported that in Assamese Macaques, a provisioned group spent more time on
clumped resources than forest groups. As
a result, the provisioned monkeys were more aggressive towards each other, and
to reduce tension, also indulged more in grooming than the forest monkeys. Jayanta Das (Das 2002) found Gibbons in three
and five reserved forests in Silchar and Karimganj divisions respectively with a median group size
of three. In Borajan
where the forest damage was extensive, Gibbons were forced to move on ground to
cross between food patches and they showed many vigilance behaviors
while walking on open grounds. Dilip Chetry (Chetry
2002) (https://www.researchgate.net/profile/Dilip_Chetry2) recorded altitudinal
distribution range of Stump-tailed Macaques from 50–1,300 m in northeastern India with group size ranging from 2–63
individuals. Home range size was 336–587
ha. These monkeys fed on 200 food
plants. Stump-tailed Macaques are
terrestrial and non-seasonal breeders.
Habitat loss, fragmentation, jhum cultivation, and traditional hunting
were determined as the major threats.
Rekha Medhi (Medhi
2004) (https://www.researchgate.net/profile/Rekha_Chetry) studied the behaviour
of a semi-provisioned introduced troop of Golden Langur outside its
distribution range. Grooming played an
important role in maintaining inter-individual relationship. She also reported development of neonate,
neonate behaviour, intra-troop social dynamics and development of inert
individual relationships. Jihosuo Biswas (Biswas 2004)
(https://www.researchgate.net/profile/Jihosuo_Biswas) found that in Golden
Langurs, the home ranges of the two study groups were 25 and 58 ha. Home range
size correlated with group size and there was an overlap between ranges of
different groups. There was a bimodal
feeding peak in the mornings and evenings.
These langurs spent about 44.75% of their time resting, probably to
digest leaves which are their primary food items ingested. Joydeep Bose (Bose
2005) reported that Phayre’s Leaf Monkey is found
only in southern Assam, Tripura, and Mizoram.
The home range size correlated with group size and varied from 2.7 to
17.6 ha with a day range of 304 to 592 m.
Time-activity budgets differed between groups in plantations and
forests. Leaves (54%), followed by
shoots (23.2%) and fruits, flowers, and seeds were ingested. Dhiraj Kumar Borah (Borah 2010) studied
ecology and behavior of Capped Langurs and found that
though the time-activity budgets did not differ, the home range was larger and
the day time length of movement was smaller in the undisturbed habitat than in
the disturbed habitat. Langurs spent
most time resting, followed by feeding, and grooming was the predominant social
activity. Nabajit
Das (Das 2013) (https://www.researchgate.net/profile/Nabajit_Das) found Bengal
Slow Lorises in seven protected areas and two reserved forests in Assam with a
density ranging from 2.78 to 9.21 animals/km2. Lorises spent 42.59% of their time resting,
followed by 27.46% in locomotion, and 21.28% in feeding. They used 44 trees and
12 lianas and the food consisted of 80.93% plant exudates and only 2.32% animal
matter. The average home range size was 15.60ha.
Primate studies from the
north-east in other universities
University of Cambridge
Kashmira Kakati (Kakati
2005) (https://www.researchgate.net/profile/Kashmira_Kakati/research) found
that in Hoolock Gibbons, the encounter rates were 0.09 animal/km, 0.23
animal/km, and 0.58 animal/km in small (<5km2), medium (20–30 km2),
and large (>100km2) forest patches, respectively. Likewise, the group size was 2.5, 3.29, and
3.9 in small, medium, and large fragments.
There were fewer young in small fragments than in medium and large
fragments.
North Eastern Hill University, Shillong
G.S. Solanki (Solanki 1987) and Awadhesh
Kumar (Kumar 2006) (https://nerist.ac.in/forestry/faculties/awadhesh) studied
the behavior of Capped Langurs in Pakhui
Wildlife Sanctuary in Arunachal Pradesh and found that the langurs spent 54%
time resting and 36% in feeding. Age-sex
classes did not differ in their time-activity budgets. Most activities occurred between the heights
of 10 and 15m. Langurs fed on 52 plant species, mostly of the family Moraceae, and 68% of their diet comprised leaves. Hunting for meat was the major threat for
these langurs.
Mizoram University, Aizawl
Zothansiama (Zothansiama 2013)
(https://mzu.edu.in/department-of-zoology/) found that Stump-tailed Macaques
were scarcely distributed to the south bank of Brahmaputra River. In a captive group of Stump-tailed Macaques,
copulations in females correlated with sexual attractiveness indicated by the
bright red genital skin color. Males often indulged in homosexual behavior perhaps to regulate aggression. The forest study group fed on fruits, leaves,
shoots, and flowers of 36 plant species.
Pallab Deb (Deb 2015) studied the Western
Hoolock Gibbon in southern Assam and Mizoram and found 51 individuals in 16
family groups with a mean group size of 3.1.
Tree density varied among different habitats. Gibbons used tree from 5 to 30 m, though most
of their activities were between the heights of 6 and 25 m. They fed on fruits, flowers, leaves and
petioles of 32 plant species. Most of
the habitats of Gibbons were under anthropogenic pressures.
North Orissa University, Baripada
Raju Das (Das 2012)
(https://www.researchgate.net/profile/Raju_Das2) found that in the Chirang Reserved Forest, Golden Langurs fed on 91 plant
species of trees and climbers. The
spectrum of food plant species in the diet of langurs appeared to be determined
by the floristic composition of the habitat.
Assam University, Silchar
Mofidul Islam (Islam 2015)
(https://www.researchgate.net/profile/Mofidul_Islam) studied Hoolock Gibbons in
the Inner-Line Reserved Forest in Assam and observed that gibbons mainly fed on
Ficus, Artocarpus,
Dysoxylum, Gmelina, and
Syzygium.
Gibbon population positively correlated with canopy cover and tree
density. The dramatically changing land
cover due to reasons such as shifting cultivation is a major threat to the
gibbons in the region.
North Eastern Regional Institute of Science and
Technology, Nirjuli, India
Kuldip Sarma (Sarma 2015) studied the Eastern Hoolock Gibbon in Lower Dibang Valley and Lohit districts
of Arunachal Pradesh and found 77 groups and three solitary individuals with a
mean group size of 3.04. He estimated
the presence of 6,953 groups of gibbons with 21,710 individuals in the
state. Groups in protected forests had
larger home ranges than in unprotected forests.
Tezpur University, Tezpur
Mrigankhi Borah (Borah 2016) found that Hoolock Gibbons in Hoolongapar fed on 54 plant species in which Ailanthus, Ichnocarpus, Trichosanthes,
and Ficus were the most preferred
species. Fruits comprised 51.14% of the
diet. Vatica
lanceaefolia and Artocarpus
chaplasha grew and survived better in the
gaps than in understory whereas Artocarpus chaplasha grew better in the understory.
Some other centers of primate
research
Salim Ali Center for
Ornithology and Natural History, Coimbatore
Ajith Kumar initiated a study to explore the impact of
habitat fragmentation on various taxa including primates. G. Umapathy (Umapathy 1998)
(https://www.ccmb.res.in/People/Research-Group/G-Umapathy) found that in forest
fragments, tree density and canopy height best predicted occurrence of
primates, and it is suggested that arresting further degradation, and improving
quality, of habitats along with retention of jackfruit orchards may help
primate conservation in the fragmented landscape (Umapathy
& Kumar 2000). An Indo-German
Project funded by the Volkswagen Foundation with Werner Kaumanns
from German Primate Centre, Gottingen and Ajith Kumar from SACON as Principal
Investigators was launched to further study the effect of forest
fragmentation. Though not based at
SACON, the effect of forest fragmentation on the behavior
of Lion-tailed Macaques was also studied by Shaily
Menon (Menon 1993), a student of Frank Poirier from The Ohio State
University. Menon studied groups of
Lion-tailed Macaques in 1989–91 in a degraded forest fragment near Valparai and in an undisturbed forest at Varagaliyar and reported that the monkeys in fragments
spent more time in ranging than resting or feeding, and were more terrestrial
than the macaques in undisturbed forest.
R. Krishnamani (Krishnamani
2002) (https://www.researchgate.net/profile/Krishnamani_Ramanathan) reported
that of the 190 woody plant species in the study area, Lion-tailed Macaques
used 74 as food trees. The relative
density of these species being 57.1% indicated that the habitats in Karnataka
could support a good population of Lion-tailed Macaques. H.N. Kumara
(https://www.sacon.in/division/conservation-biology/#ffs-tabbed-12) joined the
institute in 2010 and continued studies on primates. Surveys were carried out on Lion-tailed
Macaques, Nilgiri Langurs, and Slender Loris in the
unexplored forests, and several conservation actions were initiated, resulting
in the formation of Sharavathi Lion-tailed Macaque
Wildlife Sanctuary. K. Santhosh
(Santhosh 2017) (https://www.researchgate.net/profile/K_Santhosh2) reported
that in the Lion-tailed Macaque in its northernmost population in the Western
Ghats, the mean monthly day path length correlated positively with the number
of fruiting trees, and tree density and fruit tree density also correlated
positively with habitat use (Santhosh et al. 2015). Kumara initiated
long-term studies on the Nicobar Long-tailed Macaque (NLTM). This island population surveyed earlier (Umapathy et al. 2003) suffered a heavy loss to the 2004
Indian Ocean tsunami, however, in the following decade or so, the population of
these macaques has not only recovered but increased (Velankar
et al. 2016). Arijit
Pal (Pal 2018) (https://www.researchgate.net/profile/Arijit_Pal4) found that in
NLTM, the number of births correlated with the monthly rainfall, and about 71%
of the births occurred in the rainy season (Pal et al. 2018a). These macaques showed six extractive foraging
behaviors, including some being tool-aided, and teeth
flossing (Pal et al. 2018b). Partha Sarathi Mishra (Mishra
2020) (https://www.researchgate.net/profile/Partha_Mishra3) found reciprocity,
though not equitable, in grooming among NLTM males, but no rank-related
differentiation of affiliation, indicating lack of social bonds in this
subspecies (Mishra et al. 2020a).
Females directed grooming towards high ranking males, though dominance
hierarchy was less steep than expected in Macaca
fascicularis (Mishra et al. 2020b).
University of Rajasthan, Jaipur
It was found that multi-male Hanuman Langur groups
split only after a takeover by a male from an all-male band, and the split
resulted in formation of two uni-male groups (Mathur
& Manohar 1990). In another study,
Mathur & Manohar (1992) demonstrated that population density and not
habitat disturbance was correlated with takeover in Hanuman Langurs. Reena Mathur
(https://www.researchgate.net/profile/Reena_Mathur2) at the University of
Rajasthan also hosted Linda D. Wolfe who arrived from the USA in 1984 on an NSF
grant and studied feeding ecology of Rhesus Macaques. The monkeys in a town group foraged more,
moved less, engaged in fewer aggressive acts, and slept less during the day
than the monkeys in a forest/temple complex (Wolfe 1992).
Himachal Pradesh University, Shimla
R.S. Pirta
(https://www.researchgate.net/profile/Raghubir_Pirta) carried out his Ph.D.
research at Kashi Vidyapith University, Varanasi where he studied cooperative behavior in Rhesus Macaques and reported that adult females
were the main groomers, and grooming duration increased during the mating
season; play was largely restricted to infants and juveniles (Pirta 1983). In
cooperative attacks, adult females were help-givers in both forest and urban
groups, though cooperative attacks were more among the latter (Pirta 1984). Human
disturbance caused more detrimental effects on Hanuman Langurs who were largely
restricted to broad-leaf forests than Rhesus Macaques who often visited towns
too (Ross et al. 1993). Anita Chauhan
(Chauhan 2009) (https://www.researchgate.net/profile/Anita_Chauhan5) reported
that the Rhesus Macaques subsisting in temple areas interacted more
aggressively with humans than the macaques in a marketplace and the Hanuman
Langurs, due possibly to the heavy dependence of the temple macaques on human
resources. Santosh Kumar Sahoo (Sahoo
1993) carried out a study from 1988 to 1991 in Shimla and found that the Rhesus
Macaques engaged in agonistic interactions more than the Hanuman Langurs, and
most of these agonistic interactions occurred during human feeding. Pramod Kumar (Kumar 1992) studied Rhesus
Macaques and Hanuman Langurs in Shimla between 1987 and 1991 and found that
populations of both species increased 26.61% and 25.86%, respectively, during the
study period. Rhesus Macaques were more
urban than langurs and the adult sex ratio in the two species was 1:2.3 and
1:5.6, respectively. As Shimla gets very
cold in winter, there were significant seasonal variations in the behavior of both species.
Kerala Forest Research Institute, Peechi
K.K. Ramachandran
(http://www.kfri.res.in/whois.asp?ID=10&sub=1) initiated primate research
at KFRI, primarily on Lion-tailed Macaques and Nilgiri
Langurs and supervised Ph.D. research of two students. Gigi K. Joseph (Joseph 1999a)
(https://nirmalacollege.ac.in/department-faculty/dr-gigi-k-joseph/) reported
the presence of 14 groups of Lion-tailed macaques and 85 groups of Nilgiri Langurs in Silent Valley. The food of Lion-tailed Macaques comprised
91% plant and 9% animal matter. The
average group size of Nilgiri Langurs was 5.89. R. Suganthasakthivel
(Suganthasakthivel 2011)
(https://www.researchgate.net/profile/R_Suganthasakthivel) found a total of 13
groups with an average group size of 15.4 of Lion-tailed Macaques and 23 groups
of Nilgiri Langurs with an average group size of 6.5
in the Nelliampathy forests. The relative
abundances of diurnal arboreal mammals ranged between 1.2 and 12.6 individuals
per 10km.
Centre for Cellular and Molecular Biology, Hyderabad
After his Ph.D. from SACON and post-doc from
University of Mysore, G. Umapathy joined Laboratory
for the Conservation of Endangered Species (LaCONES)
at CCMB, Hyderabad and continued his studies on effects of habitat
fragmentation on demography, genetic status, hormones, and endoparasites in primates
in the Anamalai Hills. Sustained habitat fragmentation and exposure
to human and livestock increased the prevalence of endoparasite in Lion-tailed
Macaques (Hussain et al. 2013) and Nilgiri Langurs
(Tiwari et al. 2017). M.S. Ram (Ram
2018) (https://www.researchgate.net/profile/Ram_M_S2) constructed phylogeography of the Lion-tailed Macaque across its range
and found that these macaques in forest fragments had depleted mitochondrial
diversity and that the Palghat gap in the Western Ghats separated their
populations into two almost 2.11 million year ago (Ram et al. 2015). In the Endangered Golden Langur in Assam,
though the genetic diversity was high, populations in smaller forest fragments
showed lower nucleotide diversity than in larger fragments (Ram et al. 2015).
Aligarh Muslim University, Aligarh
Ekwal Imam (Imam 2000)
(https://www.researchgate.net/profile/Ekwal_Imam) monitored populations of
Rhesus Macaque near Aligarh. In the
study region, 963 monkeys in 1993 increased to 1337 in 1995 with a birth rate
of 0.81 infant/female/year and high infant survivorship. These observations agree with general trends
in population increase in Rhesus Macaques in several places in 1980s and 1990s.
University of California, Davis
Uma Ramakrishnan (Ramakrishnan 1999) found that in the
wild bonnet macaques, discrimination of predators, and anti-predatory
responses, develop ontogenetically as juveniles, subadults and adults respond
to the stimuli differently.
University of Burdwan, Bardhaman
Sangita Mitra (Mitra 2000) studied behavior of
Assamese Macaques near Darjeeling during 1996 and 1999 in broadleaf forests up
to 2,500m, though the macaques were found mostly between 200 and 500 m. The adult sex ratio was 1:2.88 and the ranges
varied from 0.6 to 3.5 km2.
University of Calicut, Kozhikode
Arboreal mammals with special reference to the Nilgiri Langur were studied in the high ranges in Kerala
(Joseph 1999b). A surprising finding was
that Nilgiri Langurs were observed to feed on fruits
(50%) more than on leaves (30% and flowers (20%). More carbohydrates containing food were used
by langurs in summer and more protein and lipid were consumed during rainy
season and winter.
Maharaja Ganga Singh University, Bikaner
Rhesus Macaques in the Aravali
Hills were active during mornings and evenings in summer, but more active
during the day in winter (Sharma 2009).
Indian Institute of Science, Bengaluru
Though taxonomy research on primates has been going on
in the Indian Institute of Science for long, it is only recently that an
ecological study by Mehreen Khaleel (Khaleel 2020)
(https://www.researchgate.net/profile/Mehreen_Khaleel) has shown that Hanuman
Langurs in Kashmir Himalaya are distributed wider than previously thought. These langurs show seasonal variations in home
ranges and diet in accordance with the energy maximizing strategy.
University of Madras, Chennai
R. Sasi (Sasi
2018) provided the status and distribution pattern of lion-tailed macaque and
slender loris for the less explored regions including Parambikulam
landscape and Megamalai-Srivilliputhur-Tirunelveli
hills in the southern Western Ghats.
Bharathiyar University, Coimbatore
Shanthala Kumar (Kumar 2019)
(https://www.researchgate.net/profile/Shanthala_Kumar) reported that the
relocation of Bonnet Macaques from urban areas to a wild habitat facilitated
the spread of alien endoparasites to Lion-tailed Macaques where these parasites
were otherwise absent. Even on an
isolated island system, the increased use of human-dominated spaces by Nicobar
long-tailed Macaques has resulted in an increased endoparasite richness and
prevalence.
FUTURE
National survey of primates
There have been some attempts in the past to census
primates in different regions of the country.
The earliest surveys were on the Rhesus Macaques in certain parts of
northern India initiated by Charles Southwick (described earlier in this
article). Zoological Survey of India
undertook surveys in northern India under the leadership of R.P. Mukherjee (Mukherjee
& Mukherjee 1972), in southern India by G.U. Kurup
(Kurup 1984), and in the northeastern
India by J.R.B. Alfred (Alfred & Sati 1990; Alfred et al. 2004) and some
others at localized places the details of which are available with ZSI at
http://faunaofindia.nic.in/. Primates
in northeastern India were also surveyed under the
Indo-US Primate Project (Srivastava 1999).
Ullas Karanth (Karanth 1985) surveyed Lion-tailed Macaques in the state of
Karnataka. Most of these surveys are now
outdated and were largely localized. It
is only recently that a systematic survey on Rhesus Macaques has been carried
out in Himachal Pradesh (Kumara & Singh
2020). There have been several status
assessments of primates by Zoo Outreach Organization including PHVAs for the
Lion-tailed Macaque (Kumar et al. 1995), primates of South Asia (Molur et al. 2003) and Hoolock Gibbon (Molur
et al. 2005). There is, therefore, an
urgent need to take up a nationwide survey of primates in India.
Population monitoring
Population dynamics can be studied if a population is
monitored for decades. Most research
studies are of two to three year durations, and hence cannot bring out the
stochasticity of primate populations. A
lesson is learnt from the monitoring of Bonnet Macaque populations around the
city of Mysore for over 30 years now by Mewa Singh
and his team which has shown a ~70% decline in these macaques (Erinjery et al. 2017a).
We need to identify populations that are representatives of each species
in different habitats and monitor them at least once in three years for several
decades to comprehensively know the trends.
Taxonomic studies
Several species of primates in India are classified
into subspecies. In order to prioritize
conservation, it is necessary that genetic studies are carried out on all
subspecies to determine whether there are more distinct species. For example, the Hanuman Langur was
considered as only one species but it is now shown that there are many distinct
species of this langur (Ashalakshmi et al.
2015). Morphologically similar
populations of the Lion-tailed Macaque north and south of the Palghat gap have
been genetically differentiated for the past 2.1 million years (Ram et al.
2015).
Ecological and behavioral
research with long term field studies
There are many subspecies of few primate species in
India for which even baseline ecological and behavioral
information are not yet available. There
is therefore a need to not only study these subspecies, but also all species
across varied habitats. There are hardly
any long-term field studies carried out in India. The one carried out by Anindya
Sinha and his group on Bonnet Macaques at Bandipur
brought out excellent results about evolution of sociality (Sinha &
Mukhopadhyay 2013). A study on the
Himalayan Grey Langur near Chamba by the Wildlife
Information Liaison Development / Zoo Outreach Organization has been going on
since 2012
(https://www.speciesconservation.org/case-studies-projects/himalayan-grey-langur/9744)
though the results are yet to be published.
Conservation and management
Many species of primates, because of their threatened
or vulnerable status, require active intervention for in situ management. Wildlife Trust of India has been carrying out
rehabilitation of Eastern Hoolock Gibbon from small and isolated forest
fragments to large forest complexes (Roy et al. 2015). Since different species inhabit different
ecological settings and experience anthropogenic pressures, Singh (2019), for
example, has provided approaches to management of urban- and forest-dwelling
species. Likewise, appropriate
management strategies need to be synthesised through dialogues between primate
biologists and wildlife managers.
Conservation breeding
Several species of primates in India are
threatened. An expert group of
primatologists and wildlife managers should decide which of these species
require conservation breeding in order to develop sustainable captive
populations for restocking or rehabilitation, if required in the future. An initiative has already been taken for
conservation breeding of Lion-tailed Macaques but it has not yielded desired
results. Perspectives for systematic
management on the basis of analysis of conservation breeding programs in
various countries have been provided to aide planning (Kaumanns
et al. 2005, 2013, 2020).
National Primate Research Centre
There is a long pending demand of primatologists to
have a National Primate Research Centre that should be managed both by primate
biologists and wildlife managers, and funded by the Ministry of Environment,
Forest and Climate Change and Ministry of Science and Technology, Government of
India. This Centre would not only
initiate new research but will also coordinate among various institutions and
governmental agencies in the country that are engaged in primate research and
management. The Primate Centre could
also host a National Primate Museum to showcase primate taxa, educate people
and build awareness for their protection and conservation.
A Platform for Interactions
A Primatological Society of
India was established in the late 1970s but it became inactive in the
1980s. Since then, there has not been a
single platform for Indian primatologists to meet and exchange information
except a CAMP meeting conducted by Zoo Outreach Organization (Molur et al. 2003).
An enthusiastic group of Indian primatologists have established a new
platform named, Association of Indian Primatologists (https://www.indianprimates.org/)
in 2019 and conducted its first national workshop at Indian Institute of
Science, Bengaluru in November 2019.
This platform needs to be strengthened.
International Cooperation
Only three important international meetings have been
held in India: the 7th Congress of the International Primatological Society at Bengaluru in January 1979,
International Symposium on Primates at Jodhpur University in February 1982, and
the 7th Asian Primate Symposium at Gauhati
University in February 2020. The
proceedings of the Bengaluru and Jodhpur meetings led to seminal publications
(Seth & Seth, 1983b, 1989a,b; Roonwal et al.
1984, respectively). We encourage the research groups in India to become more
active in developing international cooperation so that expertise from different
countries could be integrated in research and conservation. A successful example of such a cooperation
has been the conduct of an international workshop on macaques at the University
of Mysore that resulted in the publication of an outstanding volume with
contributions from prominent primatologists from several countries (Thierry et
al. 2004). This cooperation also helped
develop strategies for conservation management, both in situ and ex situ, of
the endangered Lion-tailed Macaque (Singh et al. 2009; Kaumanns
et al. 2013).
Table 1. Primate species in India with their IUCN and
Indian Wildlife (Protection) Act status.
|
Common name |
Species |
Conservation status |
|
IUCN |
IW(P)A |
|||
|
Lorises |
|||
1 |
Slender Loris |
Loris lydekkerianus |
EN |
I* |
2 |
Slow Loris |
Nycticebus bengalensis |
EN |
I |
|
Langurs |
|||
3 |
Himalayan Grey Langur |
Semnopithecus ajax |
EN |
II |
4 |
Bengal Hanuman Langur |
Semnopithecus entellus |
LC |
II |
5 |
Lesser Hill Langur |
Semnopithecus hector |
NT |
II |
6 |
Dark-legged Malabar Langur |
Semnopithecus hypoleucos |
LC |
II |
7 |
Coromandal Grey Langur |
Semnopithecus priam |
NT |
II |
8 |
Central Himalayan Langur |
Semnopithecus schistaceus |
LC |
II |
9 |
Nilgiri Langur |
Semnopithecus johnii |
VU |
I |
10 |
Capped Langur
|
Trachypithecus pileatus |
VU |
I |
11 |
Golden Langur |
Trachypithecus geei |
EN |
I |
12 |
Phayre’s Leaf Monkey |
Trachypithecus phayrei |
EN |
I |
|
Macaques |
|||
13 |
Rhesus Macaque |
Macaca mulatta |
LC |
II |
14 |
Assamese Macaque
|
Macaca assamensis |
NT |
II |
15 |
Stump-tailed Macaque |
Macaca arctoides |
VU |
II |
16 |
Pig-tailed Macaque |
Macaca leonina |
VU |
II |
17 |
Arunachal Macaque |
Macaca munzala |
EN |
Not listed |
18 |
White-cheeked Macaque |
Macaca luecongenys |
Unknown |
Not listed |
19 |
Tibetan Macaque |
Macaca thibetana |
NT |
Not listed |
20 |
Lion-tailed Macaque |
Macaca silenus |
EN |
I |
21 |
Bonnet Macaque |
Macaca radiata |
VU |
II |
22 |
Nicobar Long-tailed Macaque |
Macaca fascicularis umbrosus |
VU |
I |
|
Gibbons |
|||
23 |
Eastern Hoolock Gibbon |
Hoolock leuconedys |
VU |
I |
24 |
Western Hoolock Gibbon |
Hoolock hoolock |
EN |
I |
*Schedule
types under IW(P)A. Lower schedule types have higher protection than higher
schedule types.
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