The normal dissolved oxygen patterns in certain temporary heterotophic pools in southeastern Louisiana are characterizd by relatively high values after initial flooding followed by a gradual decline to as low as 10% saturation as the pond ages. Laboratory delimitation of lethal oxygen thresholds for several characteristic temporary pond invertebrates revealed LD 50's of 0.1—0.4 ppm under test conditions. An unusual 8—day period of complete subsurface oxygen depletion during summer flooding in one such pond is described. Except for the conchostracans, there was little adverse effet on the macrofauna. This is attributed to the seeking of the partly oxygenated surface layer of the pond by the animals.
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Moore et al. (1968) studied this question.