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Spatio-temporal occurrence and distribution of copepod in the Karnaphuli river estuary, Bangladesh – JBES

Abu Sayeed Muhammad Sharif, Md. Shafiqul Islam, Md. Simul Bhuyan

National Oceanographic Research Institute, Bangladesh

Institute of Marine Science and Fisheries, University of Chittagong, Bangladesh

Key words: Spatio-temporal, Copepod, Occurrence, Distribution, Karnaphuli river

Abstract

A total of 25 major taxa of zooplankton were identified from the Karnaphuli River of which 23 taxa during monsoon, 20 taxa during post monsoon and 20 taxa during pre-monsoon. The sampling sites count started from the Karnaphuli River mouth towards the upstream. The seasonal highest peak of zooplankton recorded 423.54 indivs/m3, 654.4 indivs/m3 and 437.39 indivs/m3 accordingly during monsoon, post-monsoon and pre-monsoon season at site-6, site-4 and site-6 respectively. Copepod occurred at all sites as a dominating species and contributed 40.18% annually. The seasonal highest peak of copepod was 83.02% at site-2 during monsoon, 89.39% at site-4 during post-monsoon and 36.82% at site-1 during pre-monsoon season. Copepod exhibited a weak positive linear relationship with dissolved oxygen; a moderate negative linear relationship with air temperature, water temperature, pH, salinity and a weak negative linear relationship with TDS. In this study copepod showed euryhaline nature. As a consequence, their abundance increased with decreasing salinity and maximum was found in the freshwater region.

Get the original articles in Source: Spatio-temporal occurrence and distribution of copepod in the Karnaphuli river estuary, Bangladesh

Journal Name: Journal of Biodiversity and Environmental Sciences (JBES)

Published By: International Network for Natural Sciences

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