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On the Biology of Calanus Finmarchicus XII. The Phosphorus Cycle: Excretion, Egg Production, Autolysis*

Published online by Cambridge University Press:  11 May 2009

S. M. Marshall ,
P. Orr  and
R. J. Conover
S. M. Marshall
Affiliation:
The Marine Station, Millport
P. Orr
Affiliation:
The Marine Station, Millport
R. J. Conover
Affiliation:
Woods Hole Oceanographic Institution
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Extract

It is shown that equilibrium of 32P throughout the body of Calanus is reached only after a feeding period of about a week. The time required to liberate by excretion the amount of P present in a Calanus is about 20 days. Fed Calanus excrete at a higher rate than starved. The implications of excretion in feeding experiments using 32P is discussed.

There are large differences in the total P content of individual Calanus. Figures are given for ripe and unripe females, fat and lean Stage V, and eggs. A high percentage, up to 55% of the total P, may be lost by excretion during starvation.

A high proportion of the P in the food assimilated (up to 70%) may appear within a week as eggs laid.

Liberation of P from dead Calanus is very rapid and is almost complete in three days.

The relation of excretion and autolysis to the P cycle in the sea is discussed.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 41 , Issue 2 , June 1961 , pp. 463 - 488
Copyright
Copyright © Marine Biological Association of the United Kingdom 1961

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