Abstract Construction of permanent barrages in an estuary significantly alters morphology, hydrography and biodiversity, eventually leading to alteration of ecosystem structure and species distribution. Present study analyses the spatio-temporal variations in fish diversity, distribution and assemblage structure, across a permanently-built saltwater barrage in Vembanad Lake, a tropical estuary along the south-west coast of India. A barrage constructed in the middle part of the Lake in 1975, and its unscientific management over the last 45 years has hydrologically transformed the estuary into three distinct zones with distinct salinity regimes (an upper freshwater estuary, middle estuary on either side of the barrage, and a predominantly saline lower estuary). Monthly sampling was carried out in each zone from June 2015 to May 2016, representing three seasons, i.e. monsoon, post-monsoon and pre-monsoon. Fish diversity in the estuary is currently represented by 90 species belonging to 17 orders and 48 families, a 40% reduction since the 1980s. Two distinct fish assemblage were recorded on either side of the barrage indicating a lack of, or reduced habitat connectivity, with greater species diversity observed in the middle estuary. The spatial and temporal distribution of fish in the estuary was influenced primarily by salinity. Most marine species recorded prior to construction of the barrage has now disappeared and are replaced by freshwater and estuarine species. Since saline stretch of the estuary has reduced considerably d...
Fish Distribution South-west Coast Of India Middle Estuary Fish Assemblage Construction Of Barrages Fish Diversity Assemblage Structure Vembanad Lake Fish Assemblage Structure Tropical Estuary
AI-powered Research feed
Introducing Weekly Round-ups!Beta
Round-ups are the summaries of handpicked papers around trending topics published every week. These would enable you to scan through a collection of papers and decide if the paper is relevant to you before actually investing time into reading it.
Climate change Research Articles published between Jan 23, 2023 to Jan 29, 2023
Jan 30, 2023
Articles Included: 3
Climate change adaptation has shifted from a single-dimension to an integrative approach that aligns with vulnerability and resilience concepts. Adapt...Read More
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on “as is” basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The Copyright Law.