Change search
ReferencesLink to record
Permanent link

Direct link
Variability of nutrients and phytoplankton biomass in a shallow brackish water ecosystem: (Chilika Lagoon, India)
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). (Johan Wikner)
Department of Marine Sciences, Berhampur University, Berhampur, Orissa, India.
Environmental and Industrial Safety Section, Tam,ilnadu, India.
Show others and affiliations
2009 (English)In: Limnology, ISSN 1439-8621, E-ISSN 1439-863X, Vol. 10, no 2, 73-85 p.Article in journal (Refereed) Published
Abstract [en]

Seasonal and spatial variations in water quality parameters, such as nutrients [NH4 (+)-N, NO (2) (-) -N, NO (3) (-) -N, PO (4) (3-) -P, total nitrogen (TN) and total phosphorus (TP)], Secchi disc depth, salinity, dissolved oxygen, chlorophyll a, primary productivity and phytoplankton standing stock, were studied in Chilika Lagoon (from 27 sampling locations) during 2001-2003 to assess the present ecological status. The study was undertaken after a major hydrological intervention in September 2000, which connected the lagoon body and the Bay of Bengal via a manmade opening (new mouth). Current and old data on water quality were also compared to establish the changes that had occurred after the hydrological intervention. Multivariate techniques and gridding methods were used to investigate the spatial and seasonal variability of the data and to characterize the trophic evolution of the basin. Results of principal component analysis (PCA) indicated that the 27 stations can be classified into five groups based on similarities in the temporal variation of nutrients, chlorophyll a concentration, salinity, and other physicochemical parameters. The tributaries and the exchange of lagoon water with the Bay of Bengal most probably determine the water quality and the dynamics of the ecosystem. Hydrodynamics of the lagoon, weed coverage, input of urban sewage through tributaries and agricultural runoff are probably the key factors controlling the trophic conditions of the lagoon. An increase in salinity and total phosphorus was noted after the new mouth was opened, while the total suspended sediment load, the water column depth, and nitrogenous nutrients decreased. The new mouth opening also brought changes in the phytoplankton species composition.

Place, publisher, year, edition, pages
2009. Vol. 10, no 2, 73-85 p.
Keyword [en]
Siltation, Eutrophication, Chilika, New mouth
National Category
Research subject
URN: urn:nbn:se:umu:diva-40581DOI: 10.1007/s10201-009-0262-zISI: 000268017800001OAI: diva2:401094
Available from: 2011-03-01 Created: 2011-03-01 Last updated: 2012-02-27Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Panigrahi, SatyaWikner, Johan
By organisation
Department of Ecology and Environmental SciencesUmeå Marine Sciences Centre (UMF)
In the same journal

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 89 hits
ReferencesLink to record
Permanent link

Direct link