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Title of Journal: Estuaries and Coasts

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Abbravation: Estuaries and Coasts

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Springer US

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DOI

10.1002/bbpc.18990061611

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1559-2731

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Impacts of SW Monsoon on Phytoplankton Community S

Authors: Debasmita Bandyopadhyay Haimanti Biswas V V S S Sarma
Publish Date: 2016/11/28
Volume: 40, Issue: 4, Pages: 1066-1081
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Abstract

The major Indian rivers bring significant amount of freshwater along with inorganic nutrients and sediment load in to the northern Bay of Bengal BOB during the southwest monsoon SWM the southern bay does not experience equal freshening This contrasting pattern may considerably impact the physicochemical features and phytoplankton community composition in this bay and was investigated during a coastal cruise during the SWM covering eight river plumes from both northern and southern bay phytoplankton pigments and physicochemical parameters were analysed from different depths 0 10 25 and 50 m Significant freshening stratification and warmer waters were noticed in the northern bay relative to its southern part Phytoplankton pigment analysis and diagnostic pigmentbased size class analysis revealed the dominance of microphytoplankton mainly diatoms in the northern bay and were mostly confined to the surface waters Their abundance was positively correlated with dissolved silicate DSi concentrations and inversely with salinity Nanophytoplankton and picophytoplankton prymnesiophytes chrysophytes and cyanophytes were mostly noticed in the subsurface waters and dominated the southern bay This finding suggests that the dominance of microphytoplankton in the northern bay may significantly contribute to higher particle flux which has been reported earlier Therefore any modification in future river discharge which is in turn related to the intensity of Indian summer monsoon will alter the phytoplankton community structure in the coastal BOB and may be further cascaded to the other vital ecosystem components like fisheries resources organic carbon export flux and benthic productionWe thank the director CSIR National Institute of Oceanography NIO Goa and Scientist in Charge SIC Visakhapatnam for their continuous support and encouragement We appreciate the help of the ship’s master officers and crew members during sampling We are thankful to the Ministry of Earth Science MoES for allotting ship time for this study All other help and cooperation from all the participants of CSIRNIO RC Visakhapatnam are gratefully acknowledged here NIO contribution number for this publication is 5961

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  2. Watershed Controls on the Geomorphology of Small Coastal Lagoons in an Active Tectonic Environment
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