Eutrophication induced changes in benthic community structure of a flow-restricted tropical estuary (Cochin backwaters), India.

Environmental Monitoring and Assessment
G D MartinG V M Gupta

Abstract

The influence of anthropogenic loading on the distribution of soft bottom benthic organisms of a tropical estuary (Cochin backwaters) was examined. The industrial activities were found to be high in the northern and central part of the estuary, where dissolved inorganic nitrogen (DIN > 210 μM) and phosphorus (DIP > 6.5 μM) have caused high abundance of chlorophyll a (up to 73 mg m(-3)) and accumulation of organic carbon in sediments (up to 5%). Principal component analysis distinguished three zones in the estuary. The central zone (Z1) was characterized by organic enrichment, low species diversity, and increased number of pollution tolerant species. Long-term deterioration of the estuary is indicated by an increase in the nutrients and chlorophyll a levels by sixfold during the last few decades. Flow restrictions in the lower estuary have lead to a fourfold increase in sediment organic carbon over the period of three decades. The reduced benthic diversity followed by an invasion of opportunistic polychaetes (Capitella capitata), are indicative of a stress in the estuary.

References

Jul 10, 2007·Environmental Monitoring and Assessment·K K BalachandranP Sheeba
May 31, 2011·Nucleic Acids Research·Lars Rønn OlsenRasmus Wernersson

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Citations

Mar 28, 2013·Environmental Monitoring and Assessment·Ammini ParvathiMaheswari Nair
Apr 17, 2014·The Science of the Total Environment·Larissa DsikowitzkyJan Schwarzbauer
Oct 13, 2016·Marine Pollution Bulletin·A RamziN Chandramohanakumar
Apr 25, 2017·Marine Pollution Bulletin·P M SalasEldhose Cheriyan
Dec 5, 2018·World Journal of Microbiology & Biotechnology·Puthiya Veettil VipindasAnas Abdulaziz
Aug 21, 2020·Environmental Science and Pollution Research International·Kiran KrishnaShanta Nair
Mar 15, 2021·Environmental Science and Pollution Research International·Pandiya Rajan Rethinam SubramanianVishnu Chandrababu

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