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The Distribution Of Some Plankton Animals In The English Channel And Approaches: III. Theories About Long-Term Biological Changes, Including Fish

Published online by Cambridge University Press:  11 May 2009

A. J. Southward
A. J. Southward
Affiliation:
The Plymouth Laboratory
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Extract

Various biological and environmental changes that have been observed during the present century in the area of the western English Channel are briefly described, and then theories that have been put forward to account for them discussed and compared critically with one another.

At the moment, the rise in sea temperature and a possible accompanying change in emphasis of water movements offers the best explanation of all the changes. Such a theory is obviously applicable to the replacement of coldwater northern forms by warmer-water species that has taken place in many habitats (e.g. demersal fishes, pelagic fishes, intertidal zone). A decline in number of macroplankton animals, including the pelagic young of some demersal fish, can be regarded as another aspect of the temperature change, in part related to a shift in distributional boundaries, but also influenced by the replacement of herring by pilchard, which has apparently led to increased stocks of pelagic fish, and perhaps a higher level of predation throughout the year. It is suggested that the plankton production cycle may have become slightly smoother, and possibly a little more efficient, with less' wastage' to the bottom-fauna, the biomass of which may also have suffered indirectly from the increased stocks of pelagic fish.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 43 , Issue 1 , February 1963 , pp. 1 - 29
Copyright
Copyright © Marine Biological Association of the United Kingdom 1963

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