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By R. C. Newell (Eds.)

ISBN-10: 040870778X

ISBN-13: 9780408707787

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Extra info for Adaptation to Environment. Essays on the Physiology of Marine Animals

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This lack of compensatory change in the feeding rate of Mytilus edulis suggests that the species may be limited on the upper shore by a predominantly negative index of energy balance, which yields little scope for growth or reproduction. In contrast to this apparently simple 4 on/off' feeding response when Mytilus is covered by the tide, some other bivalves are apparently able to compensate for the reduced feeding period on the upper shore by increasing their rate of food assimilation. Morton, Boney and Corner (1957) studied the filtration rate of the small crevice-dwelling bivalve Lasaea rubra.

2. The environmental temperatures, or more strictly the tissue temperatures of the animals, are commonly not known in detail under natural conditions. 3. The upper lethal temperature of the animals may be different in air and in water as, for example, in chitons (Kenny, 1958), Uca (Wilkens and Fingermann, 1965) and in trochid gastropods (Micallef, 1966). 4. Large scale mortality of intertidal animals has only rarely been related causally to environmental and tissue temperatures of animals whose thermal tolerances are known (Orton, 1933; Hodgkin, 1959; Frank, 1965; Sutherland, 1970; Wolcott, 1973).

In general, the shore environment is a complex one in which temperature and desiccation interact to produce stresses which are characteristic of the upper shore whilst temperature and salinity may be the predominant factors affecting survival in estuarine situations. The effects of 44 A D A P T A T I O N S ΤΟ INTERTIDAL LIFE these factors on survival are, however, also controlled by age and sex of the organism whilst other indicator processes such as growth may also be implicated in the effects of environmental factors on survival.

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Adaptation to Environment. Essays on the Physiology of Marine Animals by R. C. Newell (Eds.)


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