Abstract
Abstract Community metabolism was measured over a 24-month period by a modified diel oxygen procedure in three Missouri strip-mine lakes, one acid and two formerly acid. Water pH ranged from 3.2 to 8.1. Biotic diversity was inversely related to acidity. Maximum daily values of gross photosynthesis were similar in the lakes (7.9, 7.6 and 6.5 g O2 m-2 day-1). The highest rates of annual gross volumetric photosynthesis (586 and 682 g O2 m-3 yr-1) were found in the more nearly eutrophic alkaline lake in both 1963–64 and 1964–65. Annual areal gross photosynthetic values were variable among the lakes in 1963–64, but similar in 1964–65. Community respiration values, which were reasonably similar in the lakes, were considerably lower than in ponds and Texas coastal bays of similar photic depth. Rates of community respiration closely paralleled gross photosynthesis so that the P/R ratio of each lake fluctuated about unity. Community function in these acid and alkaline strip-mine lakes, judged by rates of photosynt...
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