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On the nutrition and metabolism of zooplankton III. Nitrogen excretion by Calanus

Published online by Cambridge University Press:  11 May 2009

E. D. S. Corner ,
C. B. Cowey  and
S. M. Marshall
E. D. S. Corner
Affiliation:
The Plymouth Laboratory
C. B. Cowey
Affiliation:
Unit for Biochemical Research bearing on Fisheries Problems1, National Institute for Research in Dairying, Shinfleld, Reading
S. M. Marshall
Affiliation:
Marine Station, Millport
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Extract

Nitrogen excretion by Calanus finmarchicus (Gunnerus) and C. helgolandicus Claus collected at Millport and Plymouth has been measured under various experimental conditions.

Adult females feeding on Brachiomonas submarina, Cricosphaera elongata and Skeletonema costatum at cell concentrations corresponding to the mean annual level of particulate nitrogen in Plymouth Sound excrete 12·4, 9·0 and 6·4 μg N/mg dry body weight/day respectively. When the concentration of food is raised, as might occur during a spring outburst of phytoplankton, there is an increase in the quantity of nitrogen excreted. On the other hand, nitrogen excretion rapidly diminishes in the absence of food.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 45 , Issue 2 , June 1965 , pp. 429 - 442
Copyright
Copyright © Marine Biological Association of the United Kingdom 1965

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