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    Waning of plankton food web in the upstream region of the Cochin backwaters during the southwest monsoon

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    Indian_J_Geo-Mar_Sci_44_1145a.pdf (431.8Kb)
    Date
    2015
    Author
    Jyothibabu, R.
    Madhu, N.V.
    Martin, G.D.
    Aneesh, C.
    Sooria, P.M.
    Vineetha, G.
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    Abstract
    Heterotrophic bacteria (0.2-2 µm), pico-phytoplankton (0.2-2 µm), nano-phytoplankton (2-20 µm), micro-phytoplankton (>20 µm), heterotrophic nanoflagellates (2-20 µm), and micro-zooplankton (20- 200 µm) present in the Cochin backwaters were quantified during the Southwest Monsoon High fresh water influx during the period transformed the Cochin backwaters into an extensive fresh water zone with high levels of nutrients (nitrate av 20 µM; phosphate av 3 µM), which favoured high phytoplankton abundance (av 31±9 x 10<sup>4</sup> No L<sup>-1</sup>) and chlorophyll a (av 5.2 ± 3.2 mg m<sup>-3</sup>) Autotrophic pico-plankton and nano-plankton contributed the majority (av 69 ± 16%) of the total chlorophyll a while heterotrophic bacteria was found to be high throughout the study area (av 3 ± 0.6 x 10<sup>8</sup> No L<sup>-1</sup>) Abundance of heterotrophic nano-flagellates and micro-zooplankton were markedly lower in the freshwater dominant region (av 0.5 ± 0.3 x 10<sup>6</sup> No L<sup>-1</sup> and av 3 ± 1 No L<sup>-1</sup>) as compared to the downstream region (av 6 ± 3 x 10<sup>6</sup> No L<sup>-1</sup> and av 3222 ± 3619 No L<sup>-1</sup>) This clearly indicated a weak microbial food web in a major part of the Cochin backwaters during the Southwest Monsoon The ecological implication is that it leads to inefficient transfer of bacterial and pico/nano-phytoplankton biomass to higher trophic levels This study provides further evidences to our earlier observation that most of the heterotrophic bacteria and phytoplankton carbon in monsoonal estuaries gets transported to the coastal regions during the Southwest Monsoon.
    URI
    http://drs.nio.org/drs/handle/2264/7684
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