Abstract
Cobalt‐57 was added to bottles of lake water to see whether there were any seasonal changes in the apportionment of cobalt between solution (filtrate) and seston after 24‐hr incubation or whether any differences in this distribution could be found between lakes.Several distinct patterns in the seasonal apportionment of 57Co between “solution” and seston were observed, but no explanation of the basic mechanism causing these changes is offered. In two of the lakes there was a statistically significant relation between certain detrital particles, rhizopods, and the per cent of introduced 57Co associated with solids.In general, direct biological uptake did not appear to be significant in removing 57Co from solution in Lake Mendota’s epilimnion. Photosynthetic activity was of little influence. Experiments with inhibitors and heated water also indicated that nonbiological processes were most important. Autoradiographs showed little radioactivity associated with algae.
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