Abstract
1. 1. Compression of freshwater gammarids from Lake Baikal elicits a series of 9 distinguishable response stages reflecting successive phases of hyperactivity, convulsions and immobilization. 2. 2. Convulsion threshold pressures are much greater for abyssal than for shallow water gammarids and average at a pressure near the maximum existing in the lake. 3. 3. Threshold pressures for the other two phases are substantially greater than can possibly be encountered in Lake Baikal and differ little between deep and shallow water gammarids. 4. 4. The relation of these observations to the problem of the role of hydrostatic pressure as a selection factor in the evolution of deep water fauna is discussed.
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