By R. C. Newell (Eds.)
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Extra resources for Adaptation to Environment. Essays on the Physiology of Marine Animals
His data show that there is an interaction between temperature and desiccation in controlling the local distribution of the organisms. In general, however, there is a correlation between resistance to desiccation and the position the animal occupies in the crevice. Animals which occupy the inner parts of the crevice such as Ovatella myosotis, Anurida maritima, Dynameme bidentata and Porcellana platycheles are less resistant to desiccation than species living in the outer regions such as Campecopea hirsuta, Lasaea rubra, Littorina saxtilis and Eulalia viridis.
Comparatively minor differences in the heat-lethal temperature of organisms may acquire an ecological significance following prolonged periods of exposure to near lethal temperatures. Equally, the effects of concentration of the body fluids by water loss may interact with the effects of temperature to produce a lethal situation within the zone of tolerance for each factor independently. Some of the possible interactions between the effects of temperature and salinity are discussed below. 3 TOLERANCE OF SALINITY STRESS The effects of external salinity change make themselves felt on both the survival and growth rates of many marine organisms.
In the winkle Littorina littorea, the situation is similar to that in Clymenella, an increase in acclimation temperature between 5 and 16°C having a major effect on the heat tolerance of the organism (Newell, Pye and Ahsanullah, 1971b). 19 which shows that further acclimation to temperatures between 16 and 25°C resulted in little further enhancement of the heat tolerance. 5, 16, 21 and 25°C on the heat tolerance of the winkle Littorina littorea. Note that thermal acclimation between 5 and 16°C was most effective in increasing the upper lethal temperature.
Adaptation to Environment. Essays on the Physiology of Marine Animals by R. C. Newell (Eds.)