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Picophytoplankton as tracers of environmental forcing in a tropical monsoonal Bay

DRS at CSIR-National Institute of Oceanography

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Title Picophytoplankton as tracers of environmental forcing in a tropical monsoonal Bay
 
Creator Mitbavkar, S.
Patil, J.S.
Rajaneesh, K.M.
 
Subject AQUATIC COMMUNITIES::Phytoplankton
AQUATIC ECOLOGY, PRODUCTIVITY::Environmental effects
POPULATION STUDIES::Population dynamics
 
Description In order to better understand the picophytoplankton (PP) dynamics in tropical monsoon influenced coastal regions, samples were collected daily (June?September 2008: monsoon, December 2008: post-monsoon and April 2009: pre-monsoon) from a fixed station in Dona Paula Bay, India. Eight PP abundance peaks comprising Prochlorococcus-like cells, picoeukaryotes, and three groups of Synechococcus occurred. The chlorophyll biomass and PP abundance were negatively influenced by reduced solar radiation, salinity and water transparency due to precipitation and positively influenced by the stabilized waters during precipitation break/non-monsoon periods. Responses to environmental conditions differed with PP groups, wherein the presence of Synechococcus-PEI (phycoerythrin) throughout the year suggested its ability to tolerate salinity and temperature variations and low light conditions. Synechococcus-PEII appearance toward monsoon end and non-monsoon during high water transparency suggests its tidal advection from offshore waters. Dominance of Synechococcus-PC (phycocyanin) at intermediate salinities under low water transparency during MON and high salinities in PrM coinciding with high nitrate concentrations implies a greater influence of light quality or nutrients. Cyanobacteria and not picoeukaryotes were the dominant picophytoplankton in terms of numbers as well as biomass. This study suggests that PP could be used as tracers of environmental forcing driven by tides and freshwater influx and also highlights the importance of high-frequency samplings in dynamic coastal regions through which transient responses can be captured
 
Date 2015-12-08T09:19:51Z
2015-12-08T09:19:51Z
2015
 
Type Journal Article
 
Identifier Microbial Ecology, vol.70(3); 2015; 659-676
no
http://drs.nio.org/drs/handle/2264/4869
 
Language en
 
Relation Microb_Ecol_70_659.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