R. C. Newell (Eds.)'s Adaptation to Environment. Essays on the Physiology of PDF

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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17). Although the absolute levels cannot be validly compared because of 0. 17 Graphs showing the relationship between zonational distribution and upper limit of thermal tolerance in (a) a series of gastropods from False Bay, South Africa (data from Broekhuysen, 1940) and (b) a series of trochid gastropods from Wembury, Devon (data from Micallef, 1966). (After Newell, 1970; courtesy Paul Elek (Scientific Books) Ltd) the different experimental methods used, nevertheless the correspondence between the lethal limits and zonational position are striking.

Many intertidal animals including polychaetes such as Arenicola marina, Nereis diversicolor and Thoracophelia mucronata (Wells, 1949; Dales, 1963), some bivalves such as the cockle Cardium edule (Boyden, 1972), the gastropod Nassarius (Kushins and Mangum, 1971) and intertidal fishes such as Blennius pholis (Daniel, 1971; Wallace, 1973a) are able to utilise atmospheric air at some stages of the tidal cycle as long as they are able to do so without incurring water loss. Finally, there is a series of animals which are able to maintain aerial gas exchange even under conditions of desiccation stress.

25 from which it can be seen that their rate on immersion was similar to that of upper shore winkles. Upper shore animals can also take up the slower rate of lower shore animals by submersion for a long period in seawater. The tidal rhythm is thus controlled by the immersion sequence and its amplitude is governed by the period of exposure to air. Whether a lowering of metabolic reserves by starvation during the intertidal period induces the higher rate of feeding is not known. These experiments do show, however, that prolonged immersion of experimental animals in the laboratory prior to experimental studies on feeding rates would effectively mask any tidal-dependent compensation in the feeding rates which occur under natural conditions.

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

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