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dc.contributor.authorSahoo, S.
dc.contributor.authorBaliarsingh, S.K.
dc.contributor.authorLotliker, A.A.
dc.contributor.authorPradhan, U.K.
dc.contributor.authorThomas, C.S.
dc.contributor.authorSahu, K.C.
dc.date.accessioned2017-09-27T13:08:45Z
dc.date.available2017-09-27T13:08:45Z
dc.date.issued2017
dc.identifier.citationEnvironmental Monitoring and Assessment, vol.189; 2017; No.153 doi.org/10.1007/s10661-017-5850-5
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/5185
dc.description.abstractA comprehensive analysis on spatiotemporal variation in physico-chemical variables and their control on chlorophyll-a during 2013-14 was carried out in the Chilika Lagoon. Spatiotemporal variation in physico-chemical regimes significantly controlled the phytoplankton biomass of the lagoon. Further, precipitation-induced river/terrestrial freshwater influx and marine influence controlled the physico-chemical regimes of the Chilika Lagoon, such as nutrients (NH<sub>4</sub><sup>+</sup>, NO<sub>3</sub><sup>-</sup>, NO<sub>2</sub><sup>-</sup>, PO<sub>4</sub><sup>3</sup><sup>-</sup> and Si(OH)<sub>4</sub>), temperature, salinity, total suspended matter and dissolved oxygen. This study revealed significant effects of tropical cyclones Phailin (2013) and Hudhud (2014) on physico-chemical regimes and in turn the phytoplankton biomass of the lagoon. Although both cyclones Phailin (2013) and Hudhud (2014) were intense, Phailin (2013) had a greater impact on the Chilika Lagoon due to the proximity of its landfall. Heavy precipitation caused an influx of nutrient-rich freshwater, both during each cyclone’s passage, through rainfall, and after, through increased river flow and terrestrial run-off. The increase in nutrients, carried by the run-off, promoted phytoplankton growth, albeit in lag phase. In general, phytoplankton growth was controlled by nitrogenous nutrients. However, the addition of SiO<sub>4</sub> through terrigenous run-off fuelled preferential growth of diatoms. The salinity pattern (which can be considered a proxy for fresh and marine water influx) indicated injection of freshwater nutrients into the northern, southern and central sectors of the lagoon through riverine/terrestrial freshwater run-off; marine influx was restricted to the mouth of the lagoon. Present and past magnitudes of salinity and chlorophyll-a were also compared to better understand the pattern of variability. A significant change in salinity pattern was noticed after the opening of an artificial inlet, because of the resulting higher influx of marine water. The overall phytoplankton biomass (using chlorophyll-a concentration as a proxy) remained consistent in the lagoon pre- and post-restoration. Due to the wide range of salinity and temperature tolerance, diatoms remained dominant in both pre- and post-restoration periods, but the overall phytoplankton diversity increased after the artificial inlet was dredged
dc.language.isoen
dc.publisherSpringer
dc.rightsAn edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2017] Springer.
dc.subjectAquatic ecology, productivity
dc.subjectChemistry and biogeochemistry
dc.subjectAquatic communities
dc.subjectMeteorology and climatology
dc.titleEffect of physico-chemical regimes and tropical cyclones on seasonal distribution of chlorophyll-a in the Chilika Lagoon, east coast of India
dc.typeJournal Article


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