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The Vertical Distribution of Marine Macroplankton. XII. Some Observations on the Vertical Distribution of Calanus finmarchicus in Relation to Light Intensity.

Published online by Cambridge University Press:  11 May 2009

F. S. Russell
F. S. Russell
Affiliation:
Naturalist at the Plymouth Laboratory
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Extract

1. Observations are given on the vertical distribution of adult Calanus finmarchicus in the daytime off Plymouth in July and August, 1931, as a result of collections made simultaneously with the photo-electric measurement of submarine illumination.

2. A series of nets, usually six, was towed simultaneously in such a manner that the depth of each net was known approximately.

3. The female Calanus in July preferred higher intensities of light than did the females in August; this change was coincident with a change in the Calanus population as shown by size measurements. A similar change in distribution and in population was shown by the males.

4. The females in July were living in intensities of 20,000 m.c. and more; but those in August were avoiding such high intensities. The males in July avoided intensities of 40,000 m.c. and over, while in August their upper limit was about 10,000 m.c.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 19 , Issue 2 , May 1934 , pp. 569 - 584
Copyright
Copyright © Marine Biological Association of the United Kingdom 1934

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References

REFERENCES

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