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The influence of body size on dive duration of underyearling southern elephant seals (Mirounga leonina)


Irvine, LG and Hindell, MA and van den Hoff, J and Burton, HR, The influence of body size on dive duration of underyearling southern elephant seals (Mirounga leonina), Journal of Zoology, 251 pp. 463-471. ISSN 0952-8369 (2000) [Refereed Article]

DOI: doi:10.1017/S0952836900008062


The dive duration of 16 underyearling (6-12 months old) southern elephant seals Mirounga leonina during their second trip to sea was investigated using geolocating time-depth recorders. Underyearling seals had a lesser diving ability, with respect to duration and depth, than adult southern elephant seals. Individual underyearlings dived for average durations of up to 20.3 min and depths up to 416 m compared to durations and depths of 36.9 min and 589 m, respectively for adults. Dive duration was positively related to their body mass at departure, indicating that smaller seals were limited to shorter dive durations, perhaps as a result of their lesser aerobic capacity. All seals often exceeded their theoretical aerobic dive limit (average of 22.1 ± 18.1%). The number of dives exceeding the theoretical aerobic dive limit was not related to mass, suggesting that factors other than mass, such as foraging location or prey availability, may have been responsible for differences in diving effort. Foraging ability, indicated by the ability of the seals to follow vertically moving prey, was positively related to seal mass, indicating that small mass restricted foraging ability. The shorter dive durations of the smaller seals inferred that they had shallower dive depths in which to search for prey, thus restricting foraging ability. Although foraging ability was restricted by size, foraging success was found to be inversely related to mass, the smaller seals gaining a higher proportion of blubber than larger seals during their foraging trips. Thus, despite smaller seals being restricted to shallower depths and shorter durations, their foraging success was not affected.

Item Details

Item Type:Refereed Article
Research Division:Environmental Sciences
Research Group:Environmental management
Research Field:Wildlife and habitat management
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Assessment and management of coastal and estuarine ecosystems
UTAS Author:Irvine, LG (Ms Lynette Irvine)
UTAS Author:Hindell, MA (Professor Mark Hindell)
ID Code:20073
Year Published:2000
Web of Science® Times Cited:49
Deposited By:Zoology
Deposited On:2000-08-01
Last Modified:2011-08-04

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