Abstract
Natural wetlands are disappearing globally due to a multitude of factors. In contrast, man-made artificial wetlands (irrigation tanks) have proliferated due to agricultural expansion. Constructing irrigation tanks is an ancient practice widespread in India, and elsewhere around the world. The semi-arid plains of south India have the largest network of irrigation tanks and support diverse flora and fauna, especially waterbirds. However, research on waterbird diversity and abundance has been restricted to a few specific water bodies, and landscape scale data is lacking. In this study we analyse the trends in waterbird abundance based on total counts of birds done in January each year by over 100 volunteers across twelve years from 2011 onwards in 133 irrigation tanks of the Tamiraparani river basin, south India. We performed similar counts in the dry season for 4 years. We developed a novel approach of using total counts and abundance of species showing declining trends to prioritize tanks for conservation in this region. Trend analysis indicated insignificant variation in species richness, while total waterbird abundance declined marginally. Fourteen out of the 50 species showed declines, of which 12 were residents and 2 were winter migrants. At the family level ducks, jacanas, terns, wagtails and waders showed a significant negative trend and guild analysis indicated a decline in the abundance of species using wetland vegetation for food and foraging. We also observed that large reservoirs in the river basin serve as a refuge for waterbirds during periods of severe drought. Some tanks in summer provide vital foraging resource for birds during water scarcity. We prioritised a cluster of seven tanks in summer and winter respectively for future conservation efforts.
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Data availability
The data that support the findings of this study are available from the corresponding author, [TG], upon reasonable request.
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Acknowledgements
We would like to thank Tamil Nadu Forest Department, Public Works Department and other line departments for joining with us for the survey and sharing tank information. The District Science Centre, Tirunelveli, St. John’s College, Palayamkottai and Muthamil Public School, Munneerpallam for providing the hall support to conduct the volunteers orientation programme. We convey our heartfelt thanks to our co-organizers Pearl City Nature Trust, Thoothukudi and Nellai Nature Club Trust and support from Annai Velankanni Multi Speciality Hospital, Tirunelveli. We would like to convey thanks to our donors IUCN Ecosystem Grants Programme (EGP), Sundaram Finance and Brakes India, Chennai. We thank all volunteers who participated in the survey.
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IUCN Ecosystem Grants Programme (EGP) and CSR grants from Sundaram Finance and Brakes India, Chennai, India.
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All authors were involved in data collection in the field. T. Ganesh and M.B. Prashanth analysed the data and presented the results. Patrick David prepared the first draft of the manuscript and all authors commented on the previous versions of the manuscript.
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David, P., Prashanth, M.B., Saravanan, A. et al. Developing a novel approach to prioritizing irrigation tanks for conservation in the Tamiraparani river basin based on long term trends of waterbirds. Wetlands Ecol Manage 31, 381–399 (2023). https://doi.org/10.1007/s11273-023-09923-6
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DOI: https://doi.org/10.1007/s11273-023-09923-6