Energetic and Behavioral Implications of Pulsed Food Availability for Zooplankton
Abstract:Evidence that short-term food deprivation can appreciably increase the subsequent ingestion rate has led to speculation in the literature that zooplankton might eat as much or more by feeding intermittently. Our calculations suggest that patchy food may result in equivalent or increased growth only if some or all the following conditions are met: (1) sufficient increase in the post-deprivation ingestion rate above the rate when food is available continuously; (2) slow decline in the enhanced post-deprivation ingestion rate; (3) no appreciable change in the assimilation efficiency for post-deprivation ingestion compared to continuous food availability; (4) sufficiently small metabolic demands associated with feeding. Patterns predicted from our calculations are consistent with the limited experimental investigations of pulsed food availability, and suggest that some zooplankton are well adapted to patchy food, while others are not. Results of pulsed feeding experiments presented here for two species of ctenophores, Mnemiopsis mccradyi and Pleurobrachia bachei, show that intermittent feeding was energetically inferior to continuous feeding, even when prey availability was equal. Heterogeneous prey distribution would therefore seem to be advantageous only if the ctenophores are able to remain in areas of higher than average prey density.
Document Type: Research Article
Publication date: November 1, 1988
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