Rates of nitrogen excretion by species of Mytilus (Bivalvia: Mollusca)
In: Journal of the Marine Biological Association of the United Kingdom. Cambridge University Press/Marine Biological Association of the United Kingdom: Cambridge. ISSN 0025-3154; e-ISSN 1469-7769, meer
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| Trefwoorden |
Bivalvia [WoRMS]; Mollusca [WoRMS]; Mytilus Linnaeus, 1758 [WoRMS]; Mytilus californianus Conrad, 1837 [WoRMS]; Mytilus edulis Linnaeus, 1758 [WoRMS]; Mytilus galloprovincialis Lamarck, 1819 [WoRMS]
Marien/Kust |
| Abstract |
There is variability with season and with habitat in both the rates of nitrogen excretion by Mytilus and the proportionality between ammonia and amino acids in the excreta. Amino-N, as a proportion of total ninhydrin-positive-substances, varied between 0 and 63%. Excretion rates were highest in the summer and lowest in the winter. These changes are related to seasonal cycles of gametogenesis and the storage and utilization of body reserves. During the winter nitrogen excretion rates increased as a result of starvation; in the summer and autumn, rates decreased during starvation. As a result, nitrogen balance was better controlled during starvation in the summer than in the winter. Rates of ammonia excretion increased with rise in temp between 11 and 21° C(Q10 =1.75) and there was no evidence of temp compensation of the excretion rate in M. edulis. |
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