STUDIES ON THE PHYSIOLOGICAL VARIATION BETWEEN TROPICAL AND TEMPERATE ZONE FIDDLER CRABS OF THE GENUS UCA. II. OXYGEN CONSUMPTION OF WHOLE ORGANISMS

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Abstract
Comparison of the metabolic rate of 7 species of Uca from the tropics and the temperate zone as influenced by starvation, size, season and temperature indicates that marked metabolic adaptation has resulted in animals from different latitudes. Q10''S of temperate and tropical zone species were similar at intermediate and higher temperatures but differed at lower thermal levels. Q10 varied with size and temperature. Seasonal variation in metabolism was observed in temperate zone animals but not tropical forms. When comparing the metabolism of 2 latitudinally isolated populations of the tropical species, U. rapax, with a closely-related temperate zone species, the pattern of metabolic response of the northernmost population of U. rapax was intermediate between the tropical and temperate zone forms.