Abstract :
Wetland ecosystems play a critical role in supporting avian biodiversity, particularly in tropical regions. The present study evaluates the diversity, habitat selection and seasonal dynamics of wetland bird communities in Kilpathi Lake, Tamil Nadu, India, over a six-month period from September 2025 to February 2026. Standard ornithological survey techniques, including point count and line transect methods were employed to document species composition and abundance. A total of 18 species belonging to 6 families and 5 orders were recorded. Simpson’s Diversity Index (1–D) indicated higher diversity during winter (0.71 ± 0.02) compared to monsoon (0.68 ± 0.02). Seasonal analysis revealed variations in abundance, density and relative abundance of species with Egretta garzetta, Ardeola grayii and Microcarbo niger emerging as dominant taxa. The overall bird density was higher in winter (3984.19 individuals/km²) than in monsoon (2765.46 individuals/km²). Habitat selection was strongly influenced by water depth, vegetation structure and resource availability. The findings highlight the ecological importance of small inland wetlands as critical habitats for sustaining avian diversity and emphasize the need for targeted conservation strategies in human-modified landscapes.
Keywords :
Avifauna, Conservation ecology, Diversity index, Habitat selection, Wetland birds.References :
- Aarif, K.M., Muzaffar, S.B., Babu, S. and Prasadan, P.K. 2017. Traditional fishing activities enhance water bird abundance. Avian Research, 8 : 16.
- Acharya, B.K., Sanders, N.J., Vijayan, L. and Chettri, B. 2011. Elevational gradients in bird diversity in the Eastern Himalaya. PLoS ONE, 6 (12): 29097.
- Ali, S. 2002. The book of Indian birds. Oxford University Press. 13th ed., 45-78.
- Ali, S. and Ripley, S.D. 1987. Handbook of the birds of India and Pakistan. Oxford University Press.
- Basaula, R., Kandel, P. and Sharma, H.P. 2021. Wetland bird diversity and seasonal variation. Ecological Studies.
- Bibby, C. J., Burgess, N. D. and Hill, D. A. 1992. Bird census techniques. Academic Press.67-89.
- Bibby, C.J., Burgess, N.D., Hill, D.A. and Mustoe, S.H. 2000. Bird census techniques (2nd ed.). Academic Press.
- Birdlife International. 2016. Important bird and biodiversity areas factsheets.
- Buckland, S.T., Anderson, D.R., Burnham, K.P. and Laake, J.L. 2008. Introduction to distance sampling. Oxford University Press.
- Canterbury, G.E., Martin, T.E., Petit, D.R., Petit, L.J. and Bradford, D.F. 2000. Bird communities as indicators of ecosystem health. Conservation Biology, 14 (2) : 544–558.
- Chatterjee, A., Adhikari, S., Pal, S. and Mukhopadhyay, S.K. 2020. Foraging guild structure of wetland birds. Ecological Indicators, 108: 105693.
- Clough, Y., Kruess, A. and Tscharntke, T. 2009. Local and landscape factors in agricultural landscapes. Biological Conservation, 142(5): 1032–1041.
- Convention on International Trade in Endangered Species. 2012. CITES appendices.
- Evans, P.R. and Dugan, P.J. 1984. Coastal birds and food resources. Cambridge University Press.
- Grimmett, R., Inskipp, C. and Inskipp, T. 2011. Birds of the Indian subcontinent. Oxford University Press.
- International Union for Conservation of Nature. 2023. The IUCN Red List of threatened species.
- Jamwal, P.S., Sharma, R. and Kour, D. 2017. Avifauna of Gharana wetland reserve. BMC Zoology, 2 : 7.
- Jha, K.K. and McKinley, C.R. 2015. Composition and diversity of migratory birds in wetlands. Notulae Scientia Biologicae, 7(1) : 1–15.
- Kaur, R. and Brraich, O. S. 2021. Diversity of wetland birds in Punjab. Journal of Threatened Taxa, 13(12) :19733–19742.
- Kaur, S., Kler, T.K. and Javed, M. 2018. Waterbird assemblages in village ponds. Journal of Entomology and Zoology Studies, 6(1) :1375–1380.
- Kumar, A., Sati, J.P., Tak, P.C. and Alfred, J.R.B. 2005. Handbook on Indian wetland birds and their conservation. Zoological Survey of India.
- Kumar, P. and Gupta, S.K. 2013. Status and diversity of wetland birds. Journal of Threatened Taxa, 5(5) : 3969–3976.
- Mandal, S., Das, K. and Saha, G.K. 2021. Bird diversity assessment in wetlands. Environmental Monitoring Studies.12 (2) : 88-101.
- Mukherjee, A., Borah, J. and Deka, P. 2021. Mid-winter diversity of waterbirds in West Bengal wetlands. Journal of the Bombay Natural History Society.118: 33-45.
- Rajpar, M.N. and Zakaria, M. 2015. Density and diversity of water birds in wetlands. Ecological Research.30(4):635-648.
- Singh, N., Kumar, R., Sharma, V. and Singh, P. 2024. Wetlands as vital ecosystems for aquatic birds. Springer Nature.
- Sutherland, W.J. 2004. Bird ecology and conservation: A handbook of techniques. Oxford University Press.112-145.

