ABSTRACT
Periodic spontaneous gill movements (SGMs) are one of the most obvious of the 21 general action patterns described in the ethogram of Aplysia californica (Leonard and Lukowiak, 1986). SGMs are thought to be a prime component of Aplysia’s respiratory cycle (Koester et al. 1974; Byrne and Koester, 1978) and in the intact animal the frequency of SGMs can be modified by changes in the partial pressures of CO2 and O2 of the sea water (Croll, 1985; Levy et al. 1989).
© 1993 The Company of Biologists Limited
1993
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