Ontogeny of diving behaviour in the Australian sea lion: trials of adolescence in a late bloomer

The Journal of Animal Ecology
Shannon L FowlerCarey E Kuhn

Abstract

1. Foraging behaviours of the Australian sea lion (Neophoca cinerea) reflect an animal working hard to exploit benthic habitats. Lactating females demonstrate almost continuous diving, maximize bottom time, exhibit elevated field metabolism and frequently exceed their calculated aerobic dive limit. Given that larger animals have disproportionately greater diving capabilities, we wanted to examine how pups and juveniles forage successfully. 2. Time/depth recorders were deployed on pups, juveniles and adult females at Seal Bay Conservation Park, Kangaroo Island, South Australia. Ten different mother/pup pairs were equipped at three stages of development (6, 15 and 23 months) to record the diving behaviours of 51 (nine instruments failed) animals. 3. Dive depth and duration increased with age. However, development was slow. At 6 months, pups demonstrated minimal diving activity and the mean depth for 23-month-old juveniles was only 44 +/- 4 m, or 62% of adult mean depth. 4. Although pups and juveniles did not reach adult depths or durations, dive records for young sea lions indicate benthic diving with mean bottom times (2.0 +/- 0.2 min) similar to those of females (2.1 +/- 0.2 min). This was accomplished by spending higher propor...Continue Reading

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Mar 4, 2006·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Julie P RichmondLorrie D Rea
Nov 8, 2006·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Cheryl A ClarkMike O Hammill
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