The butterfly community of an urban wetland system - a case study of Oussudu Bird Sanctuary, Puducherry,
India
M. Murugesan 1, P.R. Arun 2 & B.A.K. Prusty3
1,2,3 Division of Environmental Impact
Assessment, Sàlim Ali Centre for Ornithology and
Natural History, Anaikatty (PO), Coimbatore, Tamil
Nadu 641108, India
1 taxonmurugesh@gmail.com (corresponding author), 2 eiasacon@gmail.com,3 anjaneia@gmail.com
Abstract: In a study on the butterfly community of the Oussudu(Ousteri) Bird Sanctuary and its environs at Puducherry, a total of 63 butterfly species belonging to 47
genera under five families were recorded which included two endemics and three
Schedule I species. Nymphalidae was the most diverse and abundant butterfly
family of the area followed by Pieridae. The paper also discusses the abundance
and species assemblage pattern in the local butterfly fauna along with their
legal/protection status and distribution patterns in the study area.
Keywords: Butterfly community,
India, insects, Lepidoptera, Oussudu Bird Sanctuary, Oussuteri, Ousteri, Puducherry, urban wetland.
doi: http://dx.doi.org/10.11609/JoTT.o3056.4672-8 | ZooBank:urn:lsid:zoobank.org:pub:7676808F-8B0A-4D0A-AC71-26D2D51B0131
Editor: George Mathew, Kerala Forest
Research Institute, Peechi, India. Date of publication:26 August 2013 (online & print)
Manuscript details: Ms #
o3056 | Received 05 January 2012 | Final received 05 June 2013 | Finally
accepted 23 July 2013
Citation: Murugesan, M., P.R. Arun & B.A.K.Prusty (2013). The butterfly community
of an urban wetland system - a case study of OussuduBird Sanctuary, Puducherry, India. Journal
of Threatened Taxa 5(12): 4672–4678; http://dx.doi.org/10.11609/JoTT.o3056.4672-8
Copyright: © Murugesan 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: Department of Forests and
Wildlife, Government of Puducherry.
Competing Interest: Authors
declare no competing interest.
Acknowledgements: The
authors are thankful to the Forest Department of Puducherryfor all their support and enthusiastic support. Dr. A. Anil Kumar, DCF has been
especially helpful and supportive throughout the study, especially during our
field visits to Oussudu. We are also grateful to Dr.
P.A. Azeez (Director) and Dr. S. Bhupathyof SACON for their support and valuable inputs. We are thankful to Mr. P.
Subramanian, Field Assistant, for his help during the study period.
For figures, tables -- click here
In recent times, biological
diversity is increasingly being recognized as a vital parameter to assess
global and local environmental changes and sustainability of developmental
activities. Though the tropical region
contains very rich and diverse butterfly fauna, the information on species found in different habitats is very
poor particularly for the Indian region (Rajagopal et
al. 2011). In Tamil Nadu, the
systematic study of invertebrates particularly on butterflies has not been
carried out in most of the protected areas. Oussudu is one
of the unexplored inter-state protected areas shared between Tamil Nadu and Puducherry whichis also an important bird area (IBA). Even though various aspects of studies on birds, fishes, plants have been conducted in this area, there is no
previous study on butterflies. Therefore, an attempt was made to study the diversity and status of
butterfly fauna in and around the Oussudu Bird
Sanctuary, Puducherry, India.
Much of the Oussudu bank along the Tamil Nadu side consists of rural
settlements, while the Puducherry side of the lake is
predominantly urban or suburban (Abbasi & Chari
2008), which contributes to the severe anthropogenic stresses on the lake. Oussudu Lake
has been facing serious threats from multiple fronts such as reclamation,
agriculture, siltation, weed invasion, encroachments, runoff from agricultural
fields, Illegal fishing and poaching. A medical college and an amusement park are operational on the banks of
the lake. Apart from these, various
industries are also present in the vicinity of the lake (Prustyet al. 2011).
In the recent past, Oussudu Lake has also been identified as a wetland of
national importance under the National Wetland Conservation Programmeof MoEF. The Bombay Natural History Society, has designated Oussuduas one of the Important Bird Areas (IBA) of India; as over 20,000 birds
belonging to nearly 40 migratory species inhabit or winter at Oussudu (Chari et al. 2003). The Asian Wetland Bureau declared Oussudu lake as
one of the 93 significant wetlands in Asia (Alexander & Pushparaj 2010) and has been identified as one of the
heritage sites by IUCN and also ranked among the most important wetlands of
Asia. The structure of the lake is
complex, consisting of water, wetland/marsh and mudflats (Prustyet al. 2011).
The activities associated
with agriculture and urban land use have brought about dramatic ecological
changes affecting the quality of the Oussuduwatershed in terms of direct destruction of natural habitat types, increased
nutrient input to the watercourses and the lake through increased erosion,
agriculture run-off and waste disposal as well as increased natural resource
utilization such as gravel extraction, firewood harvest and fisheries. Considering the area has adequate
ecological, faunal, floral, geomorphological, natural or zoological
significance, it was declared as a bird sanctuary on 07 October 2008 for the
purpose of protecting, propagating and developing wildlife and its environment
(Prusty et al. 2011).
Study area
Oussudu Bird Sanctuary, located at
11056’19.51”–11058’38.89”N
& 79044’07.27”–79045’30.26”E, is a large
shallow wetland situated along the border of Puducherry(Fig. 1). The OussuduLake (Oussudu Eri in Tamil)
is the largest freshwater lake in Puducherryregion. It is an inter-state lake
with the water-spread area almost equally shared between the states of Puducherry and Tamil Nadu. The lake situated at a distance of 12km
from Puducherry town in the Western side on Puducherry-Villupuram-Valuthavur main road is a major
wintering ground for a large number of migratory birds. The lake is rich in flora and fauna and
is known to provide several ecological services and livelihood options for the
local communities. The lake covers
an area of about 800 ha (spread across both Tamil Nadu and Puducherry),
of which 390 ha is in Puducherry and the rest in
Tamil Nadu (Alexander & Pushparaj 2010).
Climate
The
climate of Oussudu Lake is humid and the average
annual rainfall of this region is 1300mm, of which around 63% occurs in
north-east monsoon from October–December, while the remaining is
scattered sporadically throughout the year. The climate is tropical dissymmetric
with the bulk of the rainfall during northeast monsoon
(October–December). The mean number of annual rainy days is 55 and the
mean monthly temperature ranges from 21.3–30.2 0C.
Methods
The present study was
conducted between July 2010 and May 2011. The butterflies in and around Oussudu Lake
were documented by direct observations, random walks and opportunistic
observations mostly during the morning (07:00–11:00 hr)
and in the evening (16:00–19:00 hr). These
timings were found to be suitable since the maximum butterfly activity happened
during these times. The butterfly survey was carried out by searching for a distance of 5m
on either side of the transect. Gunathilagarajet al. (1998), Kunte (2000) and Kehimkar(2008) were referred to for the identification of Butterflies. Larsen (1987a,b,c;
1988), Evans (1932) and Wynter-Blyth (1957) were also
referred to for the scientific nomenclature of butterflies. To find out species diversity, density
and richness of the butterfly species occurring in the study area, a line
transect survey was also conducted, by covering three different sides of the
lake. The
transects representative of the area were selected considering
topography, vegetation and habitat structure. A total of 15 transect counts were made
from the three transects (five counts per transect during the study). Based on abundance figures (the number
of individuals encountered per transect), the recorded butterfly species were
classified into the following four broad categories: Common (more than 10
individuals per transect); fairly common (6–10 individuals per transect);
uncommon (3–5 individuals per transect); and ‘rare’ (1–2
individuals per transect). Species
diversity, species richness and Shannon-Wiener’s index of diversity (H’) were
analyzed in the study by using the software ‘Species diversity and richness
(version 2.65, Colwell, 1994–2004).
Results
A total of 63 butterfly
species falling under 47 genera and spread over five families were recorded
during the present survey (Appendix 1). At family level, the family Nymphalidae was
dominant with 21 species (34%) followed by Pieridaewith 14 species (22%) and Lycaenidae with 10 species
(16%). The least number of butterfly species were recorded in the families Papilionidae (14%) and Hesperiidae(14%) with nine species each (Table 1).
During the present study
period, species such as Chocolate Pansy, Common Jezebel, Plain Tiger, Danaid Eggfly, Common Crow, Lime
Butterfly and Common Grass Yellow were recorded as common around the lake. The butterflies such as Tailed Jay,
Peacock Pansy, African Babul Blue, Banded Blue Pierrot were reported as rare. Three butterflies namely Common-banded
Peacock, Southern Birdwing and Great Eggfly were
reported only once during the entire study period with less than six
individuals each.
Of the 63 species, Crimson
Rose, Danaid Eggfly and
Common Pierrot are protected under schedule - I of
Indian Wildlife Protection Act 1972. Common Gull is included under Schedule - II. Species such as Blue Mormon, Crimson
Rose and Common-banded Peacock are endemic to South India and Sri Lanka. Two species namely Southern Birdwing and
Double-branded Crow are endemic to peninsular India (Kunte2000).
Butterfly community structure
From 15 transect counts, 2693
individuals of butterflies belonging to 49 species and 37 genera, spread over
five families were recorded (Appendix 1). The Shannon Index of diversity for the butterfly species was 3.40,
Simpson Index 0.96 and Fisher Alpha was 8.51 (Table 2).
Among the 49 species,
Chocolate Pansy was the dominant species with 306 individuals followed by
Common Jezebel (n=188), Small Grass Yellow (n=169), Common Grass Yellow
(n=169), Common Wanderer (n=150) and Common Crow (n=130) (Table 3).
Based on the observed
abundance during the present study period, 14 of the total 49 butterfly species
were rare in the area with less than two sightings per transect. While nine species were uncommon (3–5
sightings), 6 species were fairly common (6–7 sightings), 12 were common
(8–10 sightings) and 8 were abundant (>10 sightings) per transect
(Table 4).
Discussion
The present study indicates
that the family Nymphalidae is the dominant
family in the study area. Recently, Ramesh et al. (2010) reported a
similar pattern of dominance in the Eastern plains of the Coromandel coast. A similar pattern of predominance of Nymphalidae was also reported by different researchers from the different ecosystems of
Western Ghats (Mathew & Rahamathulla 1993;Kunte 1997; Kunte et al.
1999; Arun 2000; Devi & Davidar2001; Eswaran & Pramod2005; Kumar et al. 2007; Dolia et al. 2008; Krishnakumar et al. 2008). However, the species
richness of Nymphalidae recorded in Aringnar Anna Zoological Park, Chennai, TamilNadu differs from this general pattern and Pieridaewas the dominant butterfly family in this region according to Rajagopal et al. (2011).
But in the case of abundance,
the most abundant butterfly family in the present study area was Pieridae. A similar pattern of abundance is also reported
from various locations in Western Ghats (Ramesh et al. 2010; Rajagopal et al. 2011; Eswaran& Pramod 2005), Vikhroli,
Mumbai (Arun 2009) and SiruvaniHills (Arun 2000, 2002). One of the reasons for the higher
abundance of Pieridae butterflies in the Oussudu area might be the higher availability of their
larval food plants such as Capparis sp. around
the lake.
The representation from the
family Hesperiidae was very low when compared to the
proportion of other families in the study area. The same kind of low species richness was recorded in the
Eastern Plains of southern India (Ramesh et al. 2010; Rajagopalet al. 2011) and in the Western Ghats (Eswaran & Pramod 2005) also. It might partly be
attributed to the sampling/observer bias, since Hesperiidsare generally crepuscular in nature, and are small and cryptically coloured.
We conclude that the Oussudu Bird Sanctuary area supports a rich butterfly
community dominated by the nymphalids and pierids. The
present visitors’ areas of the sanctuary such as the boat
house and surroundings have very poor butterfly activity because of the
absence of suitable plant species, and wind breaks coupled with vehicular
movements and human disturbances. Butterfly activity is higher in the relatively undisturbed areas around
the banks of the lake with ample nectar and food plants. The butterfly diversity and abundance is
comparable to the other parts of the eastern plains and Western Ghats
also. The area may be given
importance while planning conservation programmes. Since the study area harbourssome of the endemic and protected species, it highlights the conservation
importance of the butterfly fauna of this area. From the conservation point of view,
butterflies play a very important role in plant propagation through
facilitating cross-pollination and are major ecological indicators. Part of the area may be developed into a
butterfly garden by appropriate habitat management that can improve the habitat
quality and aesthetic beauty of the sanctuary thus attracting more
visitors. Further, long term
research and monitoring on the diversity of butterflies with special reference
to their host plants and factors that affect their distribution, diversity and
abundance may be taken up in the area. It may be taken up by utilizing the rich and diverse butterfly community
of the area more effectively for conservation and education purposes.
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