Population trends and effects of local environmental factors on waterbirds at Tanguar Haor freshwater wetland complex in northeast Bangladesh

作者：A. B. M. Muksudul Alam, Sakib Ahmed, Kazi Zenifar Azmiri, Raquibul Amin, Mariëlle L. van Toor, Ashis Datta, Jonas Waldenström, Enam Haque, Sayam U. Chowdhury · 发表于：Avian Conservation and Ecology · 年份：2023 · DOI：10.5751/ace-02405-180118 · 被引用次数：6 · 研究领域：Fish Ecology and Management Studies、Flood Risk Assessment and Management、Hydrology and Sediment Transport Processes

Analysis of long-term datasets on bird populations can be used to answer ecological and management questions that are useful for conservation. Tanguar Haor (9500 ha) is one of the major freshwater wetlands in Bangladesh and supports a large number of migratory and resident waterbirds. Because of its unique ecological and economic values, it is arguably the most notable wetland in the floodplains of northeast Bangladesh and in the region. This Ramsar site supports globally important populations of threatened waterbirds, such as the Baer’s Pochard Aythya baeri , Common Pochard Aythya ferina , Falcated Duck Mareca falcata , Ferruginous Duck Aythya nyroca , Oriental Darter Anhinga melanogaster , and Black-tailed Godwit Limosa limosa . Considering the international significance of this site, knowledge gaps on waterbird population trends, and key ecological factors, we conducted waterbird census between 2008 and 2021 to identify priority sites for conservation, population trends of resident and migratory waterbirds, and environmental factors that influence their abundances. We recorded a total of 69 species of waterbirds (maximum count of 166,788 individuals in 2013) and assessed population trends of 47 species. Of these, peak counts of 15 species exceeded the 1% threshold of their Asian-Australian Flyway population estimates. Most species (59%) showed a declining trend, including the critically endangered Baer’s Pochard and the vulnerable Common Pochard, and 16 species (41%)...