Phytoplankton community structure at the juncture of the Agulhas return front and subtropical front in the Indian Ocean sector of Southern Ocean: Bottom-up and top-down control

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dc.contributor.author Naik, R.K.
dc.contributor.author George, J.V.
dc.contributor.author Soares, M.A.
dc.contributor.author Devi, A.
dc.contributor.author Anilkumar, N.
dc.contributor.author Roy, R.
dc.contributor.author Bhaskar, P.V.
dc.contributor.author Murukesh, N.
dc.contributor.author Achuthankutty, C.T.
dc.date.accessioned 2016-05-12T10:59:20Z
dc.date.accessioned 2017-09-30T03:12:37Z
dc.date.available 2016-05-12T10:59:20Z
dc.date.available 2017-09-30T03:12:37Z
dc.date.issued 2015
dc.identifier.citation Deep-Sea Research Part II-Topical Studies in Oceanography, vol.118; 2015; 233-239
dc.identifier.issn 0967-0645
dc.identifier.uri http://drs.nio.org/drs/handle/2264/7669
dc.description.abstract The juncture of the Agulhas Return Front (ARF) and Subtropical Front (STF) in the Indian Ocean sector of Southern Ocean (SO) is characterized by high mesoscale turbulence, which results in sporadic, short lived phytoplankton proliferation The biota, mainly the phytoplankton community from such a complex hydrodynamic region and its response to the mesoscale turbulence, are areas of interest for investigation Hence, during the sixth Indian expedition to SO, a two-day time series was occupied at the ARF and STF merged region (40�S 58�30`E) from 13 to 15 January, 2012 The vertical profiles of phytoplankton (based on pigment indices) indicated variation in the percentage contribution of phytoplankton functional groups (Micro, Nano and Pico) Though the overall community structure was dominated by nanoplankton, as exhibited by pigment indices and CHEMTAX analysis, drastic shifts in the community were observed at 120 m depth at six hourly intervals The oscillation between Flagellates (nanoplankton) to prokaryotes (picoplankton) and then to diatoms (microplankton) at this depth in three consecutive observations coincided with the significant variations in phosphate and nitrate concentrations, along with increase in abundance of the grazer community (ciliates and heterotrophic dinoflagellates) From the present study, it is evident that the flagellate group is the ideal one to survive in such a complex regime However, the observed small interval oscillation in the phytoplankton community could be a coupled effect of bottom-up (vertical advection that alters the nutrient flux), and top-down (increased abundance of microzooplankton) factors.
dc.language en
dc.publisher Elsevier
dc.relation.ispartof Deep-Sea Res Pt II
dc.relation.isreferencedby SCI
dc.subject Population Studies
dc.subject.other Primary productivity
dc.subject.other Ecological diversity
dc.subject.other Spatial variation
dc.subject.other ISW, Indian Ocean
dc.title Phytoplankton community structure at the juncture of the Agulhas return front and subtropical front in the Indian Ocean sector of Southern Ocean: Bottom-up and top-down control
dc.type Journal Article
dc.affiliation.author National Centre for Antarctic and Ocean Research, Vasco da Gama, Goa, India


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