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Some aspects of photosynthetic characteristics in a set of perennial irrigation reservoirs located in five river basins in Sri Lanka

Silva, E., Amarasinghe, U., De Silva, Sena, Nissanka, C. and Schiemer, F. 2002, Some aspects of photosynthetic characteristics in a set of perennial irrigation reservoirs located in five river basins in Sri Lanka, Hydrobiologia, vol. 485, no. 1-3, pp. 19-33, doi: 10.1023/A:1021310119462.

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Title Some aspects of photosynthetic characteristics in a set of perennial irrigation reservoirs located in five river basins in Sri Lanka
Author(s) Silva, E.
Amarasinghe, U.
De Silva, SenaORCID iD for De Silva, Sena orcid.org/0000-0001-9381-2136
Nissanka, C.
Schiemer, F.
Journal name Hydrobiologia
Volume number 485
Issue number 1-3
Start page 19
End page 33
Publisher Kluwer Academic Publishers
Place of publication Dordrecht, Nethrlands
Publication date 2002-10
ISSN 0018-8158
1573-5117
Keyword(s) Tropical reservoirs
Primary productivity
Underwater light climate
Sri Lanka
Summary Phytoplankton primary productivity of eleven irrigation reservoirs located in five river basins in Sri Lanka was determined on a single occasion together with light climate and nutrient concentrations. Although area-based gross primary productivity (1.43–11.65 g O2 m−2 d−1) falls within the range already established for tropical water bodies, net daily rate was negative in three water bodies. Light-saturated optimum rates were found in water bodies, with relatively high algal biomass, but photosynthetic efficiency or specific rates were higher in water bodies with low algal biomass, indicating nutrient limitation or physiological adaptation of phytoplankton. Concentrations of micronutrients and algal biomass in the reservoirs are largely altered by high flushing rate resulting from irrigation release. Underwater light climate and nutrient availability control the rate of photosynthesis and subsequent areabased primary production to a great extent. However, morpho-edephic index or euphotic algal biomass in the most productive stratum of the water column is not a good predictor of photosynthetic capacity or daily rate of primary production of these shallow tropical irrigation reservoirs.
Language eng
DOI 10.1023/A:1021310119462
Field of Research 070401 Aquaculture
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2002, Kluwer Academic Publishers
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008507

Document type: Journal Article
Collection: School of Ecology and Environment
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