Phytoplankton diversity, biomass, and production

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dc.contributor.author Madondkar, S.G.P.
dc.contributor.author Gomes, H.
dc.contributor.author Parab, S.G.
dc.contributor.author Pednekar, S.
dc.contributor.author Goes, J.I.
dc.date.accessioned 2007-07-25T05:46:18Z
dc.date.available 2007-07-25T05:46:18Z
dc.date.issued 2007
dc.identifier.citation In "The Mandovi and Zuari estuaries. eds. by: Shetye, S.R.; DileepKumar, M.; Shankar, D.", 67-81p.
dc.identifier.uri http://drs.nio.org/drs/handle/2264/629
dc.description.abstract Mandovi-Zuari (M-Z) estuarine system, Goa, India experiences large variations in freshwater input, land runoff and seawater input in different seasons. The changes in input of these waters are also influenced by tides. In recent times, the M-Z system is also subjected to human influence through alterations in catchment area and ore mining activities, and the consequent land runoff. These aspects had prompted us to examine changes in phytoplankton diversity during last two decades. Phytoplankton counts in M-Z are high during non-monsoon period compared to monsoon. In Mandovi estuary phytoplankton varied from 1.32 to 5.22 X 10 sup(5) L sup(-1) during April whereas these were from 0.628 to 3.078 X 10 sup(5) L sup(-1) in Zuari. During monsoon phase (September) phytoplankton counts range in Mandovi was 0.68 –1.36 X 10 sup(5) L sup(-1) and that of Zuari were 1.02 – 3.07 X 10 sup(5) L sup(-1). Similar pattern was also observed in pigment distribution. In Mandovi Chl a during non monsoon period was as high as 6 mg m sup(-3) and that in Zuari was 10 mg m sup(-3). During monsoon the Chl a was mostly less than 4 mgm sup(-3), which is lower compared to that in non monsoon period. In Mandovi estuary Nitzschia spp., Melosira spp., Synedra sp., Rhizosolenia spp., Chaetoceros spp. and Coscinodiscus spp. were the dominant phytoplankton found in April whereas Nitzschia spp., Coscinodiscus spp. were the dominant ones in Zuari. In September Nitzschia spp., Syndera sp., Thalassiosira spp, Dinophysis sp. were dominant in Mandovi but Zuari waters were dominated by Pheodactylum sp. and Nitzschia spp. These differences in two estuaries are compared and discussed. Although the number of species in both seasons varied greatly the diversity index remained unchanged (1 to 3.4) in both Mandovi and Zuari rivers. The low diversity less than equal to 1 was associated with development of phytoplankton blooms of species Nitzschia spp., Coscinodiscus spp. and Navicula spp in the study area. These data are compared with historical data collected in the last 20 years and long term (decadal) changes in phytoplankton biomass and diversity in M-Z estuarine system of Goa is discussed.
dc.format.extent 355777 bytes
dc.format.mimetype application/pdf
dc.language.iso en
dc.publisher National Institute of Oceanography, India
dc.subject phytoplankton diversity
dc.subject estuaries
dc.title Phytoplankton diversity, biomass, and production
dc.type Book Chapter


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