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    Seasonal variation of pteropods from the Western Arabian Sea sediment trap

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    Geo_Mar_Lett_26_265.pdf (928.7Kb)
    Date
    2006
    Author
    Mohan, R.
    Verma, K.
    Mergulhao, L.P.
    Sinha, D.K.
    Shanvas, S.
    Guptha, M.V.S.
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    Abstract
    Sediment trap samples collected from the Western Arabian Sea yielded a rich assemblage of intact and non-living (opaque white) pteropod tests from a water depth of 919 m during January to September 1993. Nine species of pteropods were recorded, all (except one) displaying distinct seasonality in abundance, suggesting their response to changing hydrographical conditions influenced by the summer/winter monsoon cycle. Pteropod fluxes increased during the April--May peak of the summer monsoon, and reached maximum levels in the late phase of the southwest summer monsoon, probably due to the shallowing of the mixed layer depth. This shallowing of MLD coupled with enhanced nutrient availability provides ideal conditions for pteropod growth which is also reflected in corresponding fluctuations in the flux of the foraminifer Globigerina bulloides. Pteropod/planktic foraminifer ratios displayed marked seasonal variations, the values increasing during the warmer months of April and May when planktic foraminiferal fluxes declined. The variation in fluxes of calcium carbonate, organic carbon and biogenic opal show positive correlations with fluxes of pteropods and planktic foraminifera. Calcium carbonate followed by biogenic opal was the main contributor to the total particulate flux especially during the SW monsoon. In the study area pteropod flux variations follow the other flux patterns indicating that they too could be used as a potential tool for palaeoclimatic reconstruction of the immediate past.
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    http://drs.nio.org/drs/handle/2264/521
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