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

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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.

PATELLA N O T E T H A T B O T H I N T R A - A S WELL A S INTERSPECIFIC D I F F E R E N C E S O C C U R IN T H E T O L E R A N C E O F W A T E R LOSS ( A F T E R D A V I E S , 1 9 6 9 ) % weight loss which all survive % weight loss for 5 0 % mortality % weight loss for 1 0 0 % mortality High level P. vulgata Low level P. aspera (low level) 60 60-65 65 44 50-55 55-60 24 30-35 40 specimens of P. vulgata on the sea-shore rarely showed evidence of experiencing dehydration amounting to 60% weight loss.

Equally in species with overlapping distribution on the shore, differences in thermal tolerance were related to conditions in the microhabitats which they select. Sassaman and Mangum (1970) have also demonstrated that the southern distribution of three different species of North Atlantic sea anemones is correlated with their lethal temperature. The main problem in any interpretation of the ecological relevance of such studies is that: 1. The heat-lethal temperatures obtained experimentally appear to be much higher than the actual environmental temperatures recorded, which suggests that these tolerances may not limit distribution on the shore.

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