Abstract
ABSTRACT A correlation between the oxygen consumption of aquatic animals and their ecology has been demonstrated on many occasions (see Prosser, 1950, table 42; Whitney, 1942; Walshe, 1948; and Berg, 1952). Regarding fresh-water forms, two main conclusions emerge: (1) that many inhabitants of rapid streams have a higher rate of oxygen consumption than similar and closely related forms from slow streams or standing water ; and (2) that inhabitants of oxygen-deficient water are often able to maintain a steady rate of oxygen consumption in the face of falling oxygen tension in the medium, until a critical level of oxygen tension is reached, below which the oxygen consumption falls rapidly.
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