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    Influence of allochthonous input on autotrophiceheterotrophic switch-over in shallow waters of a tropical estuary (Cochin Estuary), India

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    Estuar_Coast_Shelf_Sci_78_551.pdf (879.9Kb)
    Date
    2008
    Author
    Thottathil, S.D.
    Balachandran, K.K.
    Gupta, G.V.M.
    Madhu, N.V.
    Nair, S.
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    Abstract
    Bacterial productivity (BP) and respiration (BR) were examined in relation to primary productivity (PP) for the first time in a shallow tropical ecosystem (Cochin Estuary), India. The degree of dependence of BP (6.3 199.7 mu g C L sup(-1) d sup(-1)) and BR (6.6 - 430.4 mu g C L sup(-1) d sup(-1)) on PP (2.1–608.0 mu g C Lsup(-1) d sup(-1)) was found to be extremely weak. The BP/PP (0.05-8.5) and PP/BR (0.02-7.9) ratios widely varied in the estuary depending on the season and location. There was a seasonal shift in net pelagic production from autotrophy to heterotrophy due to terrestrial organic matter input through rivers which enhanced the bacterial heterotrophic activity and very high pCO sub(2) (106-6001 mu atm) levels. The heterotrophic zones were characterized by low PP but high bacterial production and respiration leading to oxygen undersaturation and exceptionally high pCO sub(2). We propose that the CO sub(2) supersaturation caused by increased bacterial respiration (in excess of PP) was a result of bacterial degradation of allochthonous organic matter. This indicates that sources other than planktonic compartment need to be explored to understand the C-cycling in this estuary. These results are of particular relevance to tropical ecosystems in general, where the bulk of world's river discharges occur.
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    http://drs.nio.org/drs/handle/2264/1087
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