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Nitrogen uptake by phytoplankton and zooxanthellae in a coral atoll

DRS at CSIR-National Institute of Oceanography

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Title Nitrogen uptake by phytoplankton and zooxanthellae in a coral atoll
 
Creator Wafar, M.V.M.
Devassy, V.P.
Slawyk, G.
Goes, J.I.
Jayakumar, D.A.
Rajendran, A.
 
Subject Aquatic Communities
Atolls
Food Conversion
Nitrogen
Zooxanthellae
Phytoplankton
ISW, India, Laccadive I.
 
Description This paper describes the nitrogen uptake, measured by assimilation of @u15@@N - labelled nitrate, ammonium, urea and @u14@@C - labelled urea, by phytoplankton, intact corals and freshly isolated zooxanthellae from the Kavaratti Atoll of the Lakshadweep Archipelago (Indian Ocean). This paper also presents the ambient concentrations of these nitrogenous nutrients in the lagoon and surrounding waters. In addition, the excretion of these nitrogen compounds by major coral species of the atoll was also measured. Based on these data, and in conjunction with microbiological studies carried out, nitrogen dynamics in the coral atoll ecosystem located in the nitrogen-impoverished oceanic waters is discussed. NH@d4@ is the principal form in which N is excreted by corals, and the rates varied from 223 to 775 ng-at (mg coral tissue) @u-1@@h@u-1@@ in 4 species. Urea excretion forms about 5% of total N excreted. N balance (NH@d4@@, urea, NO@d3@@) calculated from 4 species of corals shows that zooxanthellae can derive all their N requirements from coral excretion alone, and that about 80% of the N taken up by zooxanthellae is translocated to corals in 4 hours
 
Date 1995-06-13T10:01:11Z
2017-09-29T13:48:26Z
1995-06-13T10:01:11Z
2017-09-29T13:48:26Z
1985
 
Type Conference Article
 
Identifier Proceedings of Fifth International Coral Reef Congress, Tahiti, 27 may - 1 June 1985. Vol. 6. vol.6; 1985; 29-37
http://drs.nio.org/drs/handle/2264/6347
 
Language en
 
Relation 5th International Coral Reef Congress, Tahiti, 27 may - 1 June 1985. Vol. 6
NON-SCI