Effects of El Niño on the Foraging Energetics of the California Sea Lion
For a marine mammal foraging on widely dispersed prey items, the distribution and availability of prey and its species composition determine the rate of energy expenditure and acquisition. Models of central place foraging, optimal diet choice, and maximization of energy intake have attempted to predict how an animal should behave under a given set of circumstances (Charnov 1976; Dunstone and O’Connor 1979; Orians and Pearson 1979; Pyke 1984; Kramer 1988). However, few studies have documented how the rate of energy acquisition is modified when environmental circumstances change dramatically during a catastrophic event, such as the 1982/83 El Niño (EN).
KeywordsWater Influx Trip Duration Female Body Mass Water Influx Rate Total Water Influx
Unable to display preview. Download preview PDF.