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Variation in the foraging location of antarctic fur seals (Arctocephalus gazella) and the effects on diving behavior

Staniland, I.J.; Boyd, I.L.. 2003 Variation in the foraging location of antarctic fur seals (Arctocephalus gazella) and the effects on diving behavior. Marine Mammal Science, 19 (2). 331-343. 10.1111/j.1748-7692.2003.tb01112.x

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Abstract/Summary

This study investigated how female Antarctic fur seals adapt their foraging behavior, over time scales of days, to spatial unpredictability in the distribution of their food. Lactating Antarctic fur seals are central-place foragers that feed on highly patchy but spatially and temporally dynamic food. We measured the foraging distribution of 28 fur seals to test whether variation in foraging trip durations was reflected in variation in the location of foraging and the diving behavior of seals at sea. Based on the maximum distance travelled from the breeding beach, three categories of foraging trips were denned: those to the continental shelf area (n= 12, median = 71 km), to oceanic water (n= 11, median =164 km), and to farther offshore oceanic waters (n= 5, median = 260 km). Trip duration and mean surface speed were positively correlated with the maximum distance travelled from the breeding beach. Seals on longer trips spent proportionally less of their time submerged, but there was no significant difference in the total number of dives or the total time spent foraging by seals in relation to trip duration. Evidence from this study and previous work investigating energy gain suggests that an animal on a longer foraging trip could potentially have a higher mean energy return per dive than a similar animal on a shorter foraging trip. Evidence presented suggests that the type of foraging trip (near or far) is not predetermined by the animal but may be a simple response to the stochastic distribution of the resources available.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/j.1748-7692.2003.tb01112.x
Programmes: BAS Programmes > Antarctic Science in the Global Context (2000-2005) > Dynamics and Management of Ocean Ecosystems
ISSN: 0824-0469
Additional Keywords: fur seal, Arctocephalus gazella, foraging, diving, krill
NORA Subject Terms: Marine Sciences
Zoology
Ecology and Environment
Date made live: 02 Mar 2009 16:43
URI: http://nora.nerc.ac.uk/id/eprint/5988

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