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Plankton food web and its seasonal dynamics in a large monsoonal estuary (Cochin backwaters, India)-significance of mesohaline region

DRS at CSIR-National Institute of Oceanography

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Title Plankton food web and its seasonal dynamics in a large monsoonal estuary (Cochin backwaters, India)-significance of mesohaline region
 
Creator Sooria, P.M.
Jyothibabu, R.
Anjusha, A.
Vineetha, G.
Vinita, J.
Lallu, K.R.
Paul, M.
Jagadeesan, L.
 
Subject AQUATIC COMMUNITIES::Phytoplankton
AQUATIC ECOLOGY, PRODUCTIVITY::Ecosystems and energetics
AQUATIC ECOLOGY, PRODUCTIVITY::Biological productivity
OCEANOGRAPHY AND LIMNOLOGY::Dynamics of lakes and rivers
 
Description The paper presents the ecology and dynamics of plankton food web in the Cochin backwaters (CBW), the largest monsoonal estuary along the west coast of India. The data source is a time series measurement carried out in the CBW during the Spring Intermonsoon (March?May) and the Southwest Monsoon (June?September). The plankton food web consisting of autotrophic/heterotrophic picoplankton, autotrophic/ heterotrophic nanoplankton, microzooplankton, and mesozooplankton was quantified in relation to the seasonal hydrographical settings in the CBW. The study showed that significant changes in the abundance and dynamics of plankton food web components were governed mostly by the spatial and seasonal changes in hydrography rather than short-term changes induced by tide. During the Spring Intermonsoon, all plankton consumers in the CBW was higher than the Southwest Monsoon, and the trophic interaction was more effective in upstream where there was a close coupling between all prey components and their consumers. During the Southwest Monsoon, on the other hand, the trophic interaction was more effective downstream where the abundance of all plankton consumers was significantly higher than the upstream. Based on statistical analyses NMDS/SIMPROF and RDA, we demarcated the spatial difference/mismatch in the prey and consumer distribution in the CBW and showed that a more efficient plankton food web exists in the mesohaline regions during both seasons. This suggests that a noticeable spatial shift occurs seasonally in the active plankton food web zone in the CBW; it is upstream during the Spring Intermonsoon and downstream during the Southwest Monsoon
 
Date 2015-09-08T09:46:27Z
2015-09-08T09:46:27Z
2015
 
Type Journal Article
 
Identifier Environmental Monitoring and Assessment, 187(427); 2015; 1-22
no
http://drs.nio.org/drs/handle/2264/4787
 
Language en
 
Relation Environ_Monit_Assess_187_1.jpg
 
Rights An edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2015] Springer
 
Publisher Springer