Mammals of the Meghamalai landscape, southern
Western Ghats, India - a review
Santhanakrishnan Babu 1, Gopalakrishnan Srinivas 2, HonnavalliN. Kumara 3, Karthik Tamilarasu4 & Sanjay Molur 5
1,3 Śalim Ali Centre for Ornithology and Natural History, Anaikatty(PO), Coimbatore, Tamil Nadu 641108, India
1,2,5 Wildlife Information Liaison Development
Society, 96, Kumudham Nagar, VilankurichiRoad, Coimbatore, Tamil Nadu 641035, India
5 Zoo Outreach Organization, 96, Kumudham Nagar, VilankurichiRoad, Coimbatore, Tamil Nadu 641035, India
4 Department of
Zoology, AVC College, Mannampandal, Mayiladuthurai, Tamil Nadu 609305, India
1 sanbabs@gmail.com (corresponding author), 2 sriniherp@gmail.com,3 honnavallik@gmail.com, 4 karthikherp@gmail.com, 5 herpinvert@gmail.com
Abstract: Reports on the concurrence of mammals in
the Meghamalai landscape were collated from published
literature and also the data obtained from a recent study spanning over 18
months (June 2011–December 2012). Sixty-three species belonging to 24 families occur in the landscape,
which include 24 globally threatened (one Critically Endangered; seven
Endangered; 11 Vulnerable and five Near Threatened) species. Of the recorded species, four species
are endemic to India and nine are endemic to the Western Ghats. The present study added five species,
viz., Rusty-spotted Cat Prionailurus rubiginosus, Malabar Spiny Tree Mouse Platacanthomys lasiurus,
Grizzled Giant Squirrel Ratufa macroura, Common Palm Civet Paradoxurushermaphrodites and the Indian Grey Mongoose Herpestes edwardsii to the six decade oldmammal list. But, 13 species
reported by Hutton were not recorded during the study. Among them, occurrence
of Malabar Civet Viverra civettina and Fishing Cat Prionailurus viverrinus in southern India remains
unresolved. During our study,
anthropogenic pressures such as conversion of natural habitats, encroachment,
hunting, cattle grazing and tourism were observed to affect the distribution of
mammals in the landscape.
Keywords: Arboreal mammals, conservation issues, endemism, species richness,
Western Ghats.
doi: http://dx.doi.org/10.11609/JoTT.o3596.4945-52 | ZooBank:urn:lsid:zoobank.org:pub:8F2C191C-691F-4CD8-A019-587E8F9FA11E
Editor: Mewa Singh, Mysore University, Mysuru, India. Date
of publication: 26 November 2013 (online & print)
Manuscript details: Ms #
o3596 | Received 26 April 2013 | Final received 03 August 2013 | Finally
accepted 05 October 2013
Citation: Babu,
S., G. Srinivas, H.N. Kumara, K. Tamilarasu& S. Molur (2013). Mammals of the Meghamalailandscape, southern Western Ghats, India - a review. Journal
of Threatened Taxa 5(15): 4945–4952; http://dx.doi.org/10.11609/JoTT.o3596.4945-52
Copyright: © Babu et al. 2013. Creative Commons Attribution 3.0 UnportedLicense. JoTT allows unrestricted use of this
article in any medium, reproduction and distribution by providing adequate
credit to the authors and the source of publication.
Funding: This work is part of the ATREE-CEPF and Rufford Small Grant research project and we appreciate them
for the financial support.
Competing Interest: The
authors declare no competing interests.
Acknowledgements: We thank Tamil
Nadu Forest Department and Theni Forest Division for
the permission to carry out this study; the directors and other colleagues in
SACON and WILD for the facilities and support; VANAM and WAR for their logistic
support during field work.
This article forms part of a special
series on the Western Ghats of India, disseminating the results of work supported
by the Critical Ecosystem Partnership Fund (CEPF), a joint initiative of l’Agence Française de Développement, Conservation International, the European
Commission, the Global Environment Facility, the Government of Japan, the
MacArthur Foundation and the World Bank. A fundamental goal of CEPF is to
ensure civil society is engaged in biodiversity conservation. Implementation of
the CEPF investment program in the Western Ghats is led and coordinated by the Ashoka Trust for Research in Ecology and the Environment
(ATREE).
For figures, images, tables -- click here
The Meghamalailandscape is situated in the northeastern side of Periyar Tiger Reserve, encompassing High Wavy Mountains, Varusanad Valley and Hill, and Vellimalai.
High Wavy Mountains is popularly referred to as ‘Pachchaikoomachi’
and ‘Meghamalai’ by locals that explicate dense
forest and cloud covered hill respectively (Fig. 1). Summit ridges of the landscape receive
high precipitation during the south-west and
north-east monsoons and have a narrow strip of wet forests. Meghamalaiforms an imperative wildlife corridor with PeriyarTiger Reserve to the south-west, Grizzled Squirrel
Wildlife Sanctuary to the south and the Cumbum West
forests to the north. Furthermore,
it is bestowed with certain remnant patches of wet forests in high elevation
plateaus (>1400m), which have been severely fragmented and over-exploited
for raising commercial crops and plantations that have left the natural forests
as fragments or islands.
In spite of being an important wildlife
corridor, updated data on mammals of the landscape is lacking. The earliest survey on mamals in the hill
range was started in the beginning of the 19th century by Prater. He explored and collected mammals from the CumbumValley and the northern slopes of High Wavy Mountains, and these specimens were
preserved in Bombay Natural History Society (BNHS) Museum collections. Subsequently, Wroughton(1917) wrote the descriptions for collections made by Prater,
from which he identified 24 species mainly of rodents and bats. After a lapse of three decades, Hutton
(1949) made collections and described the behaviour, habitat and distribution
of 56 mammalian species including a few range restricted and threatened
species. More than two decades
later (1972), while working on the specimens of megachiropteransat BNHS, Thonglongya had noticed that the specimen
labelled Cynopterus sphinx, collected
at the High Wavy Mountains, was wrongly identified. He identified it as a new genus Latidens and named the species Latidens salimalii (Thonglongya 1972), which is endemic to southern India. A subsequent survey by BNHS and Harrison
Zoological Museum rediscovered L. salimalii at the High Wavy Tea and Coffee Estates (KardanaCoffee Estate). In addition, a few
short surveys were also attempted to address the roost site characteristics of
the bat (Singaravelan & Marimuthu2003a,b). Kumara et al. (2011)
highlighted that the landscape harbours one of the largest populations of
globally threatened Lion-tailed Macaque Macaca silenus. Bhupathy et al. (2012) have highlighted the
conservation significance of the landscape using select vertebrates. Although
the landscape has been well explored in terms of mammals over the decades
(1917–2012) through a series of short-term studies at different time
periods (1917–2012), the updated list of mammals and their current status
(qualitative) in the landscape has not been attempted. In this context, we
update the mammals of the Meghamalai landscape based
on primary (June 2011–December 2012) and secondary information.
Materials and Methods
We carried out a study on the status and
distribution of large mammals in the landscape between June 2011 and December
2012. The entire landscape was gridded into 133 grids on the base map and each
grid was sampled for the presence/absence of the mammals by walking on
pre-determined paths. During these
walks all sighted animals were recorded, droppings on trail were recorded with
species identity, and also animal presence was recorded based on tracks and
signs. We also conducted night
surveys using flash lights or by using a motor vehicle
with lights by driving slowly and recording animals found on either side of the
road. The total sampling effort amounted to 85km. Further, we also reviewed the literature
to prepare a comprehensive list of mammals for the landscape (Wroughton 1917; Hutton 1949; Thonglongya1972; Muni 1994; Singaravelan & Marimuthu 2003a,b). The status of each mammal species observed by Hutton was compared with
the current population status (consolidated from the study) to understand the
influence of six decades of disturbance on the distribution of large mammals
(41 species). IUCN status, endemism and schedule category in Indian Wildlife
Protection Act (1972) were compiled to highlight the conservation significance
of the landscape in terms of mammals.
Results and Discussion
Sixty three species of mammals belonging to 24 families were recorded from the
landscape. The family Muridae (rats and mouse) was recorded with a maximum number
of species (Fig. 2) followed by Sciuridae (squirrels)
and Felidae (cats). Among the 63 species, 24 are globally threatened
(including one Critically Endangered; seven Endangered; 11 Vulnerable and five
Near Threatened species), nine are endemic to the
Western Ghats and four to India (Fig. 3). The number of species recorded as common (C) and very common (VC) were
lower than Hutton’s observation, however uncommon (UC) and rare (RR) were
higher than the earlier observation (Fig. 4). Five species, viz., Rusty-spotted Cat,
Malabar Spiny Tree Mouse, Indian Grey Mongoose, Grizzled Giant Squirrel
and Common Palm Civet were added for the first time to the existing list of
mammals in Meghamalai. Further, three species of bats, viz., Salim Ali Fruit bat Latidens salimalii, Lesser Dog-faced Fruit Bat Cynopterus brachyotisand Rufous Horseshoe Bat Rhinolophus rouxii were not recorded by Hutton though
recorded by Singaravelan & Marimuthu(2003a,b). Some of the sight
records of earlier notes raise doubts of its accuracy, in particular the
sightings of Malabar Civet and Fishing Cat. Detailed species information, for each
new site record, obtained from the present study is presented here.
Rusty-spotted Cat Prionailurus rubiginosus: Four observations of the
Rusty-spotted Cat (RSC) were obtained during the present study. This included two direct sightings (June
2012; Vannathiparai of GudalurRange) and two indirect sightings (July 2012, a dead one found at Manjanoothu of Varusanad Valley
and a road kill near Rajapalayam Town). The species presumably prefers low
elevation, leeward side and next to human settlements in Meghamalai.
Malabar Spiny Tree Mouse Platacanthomys lasiurus: A single individual was located at No. 29 coffee estate, located in the
south-eastern slopes of High Wavy Mountains, at 20:00 hours on 21 December 2011
during a night survey in the coffee estate areas. It was observed on a shrub at 1.5m height from the ground.
Grizzled Giant Squirrel Ratufa macroura: At five different occasions, seven individuals were observed along the
tributaries and the main river of Vaigai. The western most location of the species
in the Varusanad Valley is Arasaradi,
where the rain-shadow region starts. The distribution of the species was confirmed down towards Gandhigramam near Kadamalaikunduand in other parts of Varusanad Valley. The hill ranges that extend towards the
eastern side require an intensive survey. Although highly scattered in distribution, around 20 nests of the
species were located in riparian forests in low elevations (>400m)
Indian Grey Mongoose Herpestes edwardsii: It was frequently seen in the
dry zones of Varusanad Valley and the eastern
portions of Meghamalai. Mostly single individuals were seen but
occasionally they were observed in pairs.
Common Palm Civet Paradoxurushermaphrodites: Although it is commonly seen along the foothills next
to coconut plantations, Hutton (1949) had not reported the species during his
survey. During the night survey in
January 2012 at Meghamalai Tea Estate, a single
individual was sighted. However,
later it was found that the species had frequently been sighted in the plains
than in the mountains. The species
had been considered as a pest in the coconut plantations downhill.
Arboreal mammals: We recorded eight
arboreal mammals including five primates, two giant squirrels and one flying
squirrel. The distribution of
Lion-Tailed Macaque Macaca silenus and Nilgiri Langur Semnopithecus johnii was restricted to the high rainfall areas on the
western side, viz., No. 29 Estate, Vellimalai, Ammagajam and Jyothi estates,
whereas Bonnet Macaque Macaca radiata was recorded from all the elevation gradients
while Tufted Grey Langur Semnopithecus priam was recorded only
from drier forests mostly downhill. Grey Slender Loris Loris lydekkerianus was sighted frequently in the low
elevation dry forests. Among giant
squirrels, the Indian Giant Squirrel Ratufa indica was found in the high
canopied forests of mid and high elevations, whereas a small population
of Grizzled Giant Squirrel (seven individuals) was observed along the Vaigai River and its tributaries. The Indian Giant Flying Squirrel Petaurista philippensiswas recorded during the night surveys in thick canopiedforests areas such as Vellimalai and High Wavy
estates.
Large herbivores: About 12 herds of Asian
Elephant Elephas maximuswere located during the survey, and the maximum herd size recorded was 10. Frequent sightings of Asian Elephants
were made in Meghamalai, High Wavy, Manalar estates, Manjanoothu, Vellimalai, Vannathiparai and Arasaradi. Gaur Bos gaurus was recorded across the hill range but
direct sightings were made in the Varusanad Valley
i.e., the eastern slopes of Vellimalai. Among the ungulates, Sambar Rusa unicolor was observed widely
across the landscape and indirect evidence was recorded in all the sampled
grids. Chital Axis axis was recorded mostly in the dry eastern plains of Varusanad Valley and northern slopes of Meghamalai. Southern Red Muntjac Muntiacus muntjakwas recorded across the altitudinal gradients. Indian Chevrotain Moschiola indica was recorded and found to be highly selective
in habitat utilization and during our survey most of the sightings were made
from the riparian forests. Nilgiri Tahr Nilgiritragus hylocrius was recorded in Varayattu Parai and the southeasternslopes of High Wavy Mountains.
Carnivores: Although the landscape shares
the western side with Periyar Tiger Reserve, direct
and indirect evidence of Tigers Panthera tigris were mostly restricted
to the western plateau of the landscape. Indirect evidence was recorded in Maavadi, upper Manalar, Vellimalai and along the forest
road between upper Manalar and Vellimalai. Indirect evidence of Leopard Panthera pardus and
Dholes Cuon alpinuswas frequently observed across the sampling grids. Among other carnivore
species, Jungle Cat Felis chaus, Leopard Cat Prionailurus bengalensis, Rusty-spotted Cat, Small Indian
Civet Viverricula indica,
Brown Palm Civet Paradoxurus jerdoni, and Common Palm Civet were seldom seen during
the night surveys. Indian Grey and
Striped-necked Mongooses Herpestes vitticollis were uncommon during the study but Ruddy (Herpestes smithii)
and Indian Brown Mongoose Herpestes fuscus were observed occasionally. A single individual of Nilgiri Marten Martes gwatkinsi was sighted near the evergreen forests of
Upper Manalar.
Sixty-three species of mammals are
reported hitherto from the landscape. However, it is presumed that it is short of a few more species of
mammals, in particular rats, mice and bats. The high species richness of mammals in
the landscape can be attributed to wide elevation gradients (200–2000 m),
varied rainfall pattern (rainfed and rainshadow) and highly mosaic vegetation. These characteristics of landscape
endowed with diverse eco-climatic zones and niches act as a refuge for diverse
species of mammals. Further, the
landscape shares the corridor with important wildlife areas such as Periyar Tiger Reserve and Grizzled Squirrel Wildlife
Sanctuary in the western and southern side of the landscape, and so it
facilitates the mammals to utilize this area.
The scope of the present study (2012) was
restricted to large mammals. Hence,
bats and small rodents (rats, shrews and mice), were
not considered for comparison with Hutton’s (1949) anecdotal notes, as it
involves capturing for species identification. Six decade-old data showed the
distribution of 57 species of mammals including 41 species of large mammals, of
which the persistence of 38 large mammals in the landscape was observed, and
three were not recorded during the study, viz., Malabar Civet, Fishing Cat and
Golden Jackal. The species level
status of Malabar Civet in India remains unresolved but land-use practices in
low elevations of Varusanad Valley (cashew
plantations) matches with Elayur (Kozhikode District,
Kerala) from where a dead specimen of the species was collected during the
1990s (Ashraf et al. 1993). Moreover, Hutton (1949) categorised the species as common in high
elevations but we were informed by locals that there
was no large sized civet in the landscape. This raises the question on the report by Hutton (1949). Furthermore, recent surveys targeting
the Malabar Civet had failed to locate them in previously known distribution
localities (Nandini & Mudappa2010). The distribution of the
Fishing Cat in southern India is another doubtful record; however, the species
is also reported from Periyar Tiger Reserve, the southwestern boundary of the landscape. In addition, Menon(2009) also sketched the southern Western Ghats as the distribution limit of
the species. More intensive
sampling employing camera traps may address this unconfirmed distribution
record. Although we have not seen
the Golden Jackal during our survey, locals and forest department staff have
reported that they seldom see the jackal in the plains next to the foot hills. Though we have not
quantified threats on mammals, during our study, anthropogenic pressures such
as conversion of natural habitats (to monoculture plantations such as coffee,
tea, silk cotton etc), encroachment, poaching, cattle
grazing and tourism were observed to affect the distribution of mammals in the
landscape.
Species
richness of mammals in the Meghamalai landscape is
comparable with other protected areas/reserved forests in the eastern slopes of
the southern Western Ghats with similar landscape features, viz., Kalakkad-Mundanthurai Tiger Reserve, Grizzled Squirrel
Wildlife Sanctuary, Palani Hills and Anamalai Tiger Reserve. The distribution of mammals in Meghamalai is also comparable with a few key sites in the
southern Western Ghats such as Periyar Tiger Reserve
and Parambikulam Tiger Reserve.
As
a positive sign in the conservation initiative of the landscape, a portion of
the landscape was recently declared as a wildlife sanctuary. Although Vellimalai, the entire stretch of High Wavy Mountains and
high elevation of Varusanad Hills are rich in terms
of biodiversity, it is still under the non-protected area category
which requires further consideration for management and conservation
initiatives.
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