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Effect of tropical rainfall in structuring the macrobenthic community of Mandovi estuary, west coast of India

Published online by Cambridge University Press:  26 March 2013

Udaykumar V. Gaonkar ,
Sanitha K. Sivadas  and
Baban S. Ingole
Udaykumar V. Gaonkar
Affiliation:
Biological Oceanography Division, National Institute of Oceanography (CSIR), Dona Paula Goa, India-403004
Sanitha K. Sivadas
Affiliation:
Biological Oceanography Division, National Institute of Oceanography (CSIR), Dona Paula Goa, India-403004
Baban S. Ingole*
Affiliation:
Biological Oceanography Division, National Institute of Oceanography (CSIR), Dona Paula Goa, India-403004
*
Correspondence should be addressed to: B. S. Ingole, Biological Oceanography Division, National Institute of Oceanography (CSIR), Dona Paula Goa, India-403004 email: baban@nio.org
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Abstract

Macrofaunal community structure is determined by a number of environmental variables. The riverine run-off during the monsoon brings about drastic changes in the physico-chemical parameters of a tropical estuary. The aim of the present study was to investigate the influence of rainfall in structuring the benthic macrofaunal community of a tropical estuary. The temporal dynamics of the macrobenthic community in the monsoon dominated Mandovi estuary (central west coast of India) was studied fortnightly from June 2007 to June 2009. A fixed location, downstream of the Madovi river, was sampled for benthic and water parameters. Ten replicates were collected during each sampling date using a Van Veen grab (0.04 m2). The macrofaunal abundance showed temporal fluctuation. The multivariate analysis showed the clustering of the samples linked to the environmental parameters (CCA and LINKTREE). The temporal variation observed in the macrofaunal abundance was basically due to changes in abundance of the dominant species. The variation in macrofaunal abundance was brought about by the recruitment and settling of re-suspended adults. It can be concluded that the macrofaunal structuring is influenced by temporal changes in the environment associated with the annual monsoon rainfall. Hence climate induced changes in the monsoonal pattern may affect the macrobenthic assemblages of tropical estuaries.

Keywords

macrobenthosrecruitmenttropical estuarymonsoonrainfallwest coastIndia
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 93 , Issue 7 , November 2013 , pp. 1727 - 1738
Copyright
Copyright © Marine Biological Association of the United Kingdom 2013 

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