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Influence of suspended particulate matter on nutrient biogeochemistry of a tropical shallow lagoon, Chilika, India
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Influence of suspended particulate matter on nutrient biogeochemistry of a tropical shallow lagoon, Chilika, India
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Journal Article
Influence of suspended particulate matter on nutrient biogeochemistry of a tropical shallow lagoon, Chilika, India
2016
Overview
The behaviour of suspended particulate matter (SPM), salinity profile, dissolved nutrients, total (T.Chl-
a
) and size fractionated chlorophyll-
a
(F.Chl-
a
) were studied seasonally at Chilika Lagoon, east coast of India, during 2008–2009. The study showed large spatio-temporal variations among these parameters. The concentration of dissolved inorganic nitrogen and inorganic phosphate were found to be maximum during the monsoon, followed by post- and pre-monsoon, although the mean N:P ratios, which indicate the relative availability of N with respect to P, were 9.13 ± 3.09, 16.57 ± 11.53 and 5.47 ± 3.13, respectively. It was evident from the results that during pre-monsoon and postmonsoon, the lagoon exhibits nitrogen limitation. Mean T.Chl-
a
biomass in the lagoon showed distinct seasonality with maximum values during the pre-monsoon (23.12 ± 9.75 mg m
−3
) followed by monsoon and post-monsoon. Irrespective of seasons, maximum T.Chl-
a
was found in the northern part of the lagoon. SPM concentrations during the monsoon were relatively higher in the freshwater dominated zones compared to seawater dominated areas, indicating its riverine sources. The correlation between SPM and various dissolved nutrients (
p
< 0.05) suggests its influence on the physico-chemical conditions at varying levels. It is summarized that seasonal variation of SPM and nutrients contributed by rivers, wind induced re-suspension events and in situ regeneration processes play a crucial role in the lagoon biogeochemical cycle.
