Impact of a catastrophic flood on the heavy metal pollution status and the concurrent responses of the bentho-pelagic community in a tropical monsoonal estuary

Vineetha, G and Kripa, V and Karati, Kusum Komal and Rehitha, T V and Vishal, C R and Vineetha Valsalan, K C and Madhavan, Manu (2020) Impact of a catastrophic flood on the heavy metal pollution status and the concurrent responses of the bentho-pelagic community in a tropical monsoonal estuary. Marine Pollution Bulletin. pp. 1-15.

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Abstract

Consequences of a catastrophic flood on the habitat quality and the concurrent responses of the bentho-pelagic community were studied in Cochin estuary, a eutrophic estuary along the southwest coast of India. The episodic flood in 2018 led to a marked decline in the dissolved nutrients and heavy metal concentrations in water and sediments of the estuary. The pre-flood phytoplankton abundance dominated by a bloom-forming species Cerataulina bicornis experienced a significant drop after the flood. Contrarily, zooplankton and macrobenthos responded favorably towards the flood-imposed habitat alterations. Higher susceptibility to heavy metal pollution and increased grazing pressure from gelatinous carnivores restricted the abundance of Copepoda, the dominant zooplankton taxon during pre-flood. The lower heavy metal concentration in the sediment after the flood favored higher macrobenthic abundance and diversity with a conspicuous change in the community structure from opportunistic polychaetes, indicators of pollution to molluscans and crustaceans, indicators of the healthy benthic zones.

Item Type:	Article
Uncontrolled Keywords:	Flood; Cochin estuary; Heavy metals; Phytoplankton; Zooplankton; Benthos
Subjects:	Marine Environment > Marine Pollution Marine Environment
Divisions:	CMFRI-Kochi > Fishery Environment Management Division Subject Area > CMFRI > CMFRI-Kochi > Fishery Environment Management Division CMFRI-Kochi > Fishery Environment Management Division Subject Area > CMFRI-Kochi > Fishery Environment Management Division
Depositing User:	Arun Surendran
Date Deposited:	12 May 2020 06:03
Last Modified:	08 Apr 2022 05:52
URI:	http://eprints.cmfri.org.in/id/eprint/14236

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