McIntyre, Trevor; Tosh, Cheryl Ann; Plötz, Joachim; Bornemann, Horst; Bester, Marthán N (2010): Dive depth and dive duration data of subadult and adult, male and female southern elephant seals from Marion Island between 2004 and 2008 with links to datasets. University of Pretoria, Department of Zoology & Entomology, doi:10.1594/PANGAEA.800426, Supplement to: McIntyre, T et al. (2010): Segregation in a sexually dimorphic mammal: a mixed-effects modelling analysis of diving behaviour in southern elephant seals. Marine Ecology Progress Series, 412, 293-304, doi:10.3354/meps08680
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Sexual segregation in habitat use occurs in a number of animal species, including southern elephant seals, where differences in migration localities and dive behaviour between sexes have been recorded. Due to the extreme sexual size dimorphism exhibited by southern elephant seals, it is unclear whether observed differences in dive behaviour are due to increased physiological capacity of males, compared to females, or differences in activity budgets and foraging behaviour. Here we use a mixed-effects modelling approach to investigate the effects of sex, size, age and individual variation on a number of dive parameters measured on southern elephant seals from Marion Island. Although individual variation accounted for substantial portions of total model variance for many response variables, differences in maximum and targeted dive depths were always influenced by sex, and only partly by body length. Conversely, dive durations were always influenced by body length, while sex was not identified as a significant influence. These results support hypotheses that physiological capability associated with body size is a limiting factor on dive durations. However, differences in vertical depth use appear to be the result of differences in forage selection between sexes, rather than a by-product of the size dimorphism displayed by this species. This provides further support for resource partitioning and possible avoidance of inter-sexual competition in southern elephant seals.
Median Latitude: -47.234017 * Median Longitude: 35.065698 * South-bound Latitude: -66.435000 * West-bound Longitude: -1.747000 * North-bound Latitude: -32.471000 * East-bound Longitude: 52.052200
Date/Time Start: 2004-04-12T12:00:00 * Date/Time End: 2009-02-20T14:34:00
MAR2004_sel_a_f_10 * Latitude Start: -46.990600 * Longitude Start: 37.499100 * Latitude End: -44.197200 * Longitude End: 27.899600 * Date/Time Start: 2004-04-12T12:00:00 * Date/Time End: 2004-05-31T19:22:00 * Location: Southern Ocean - Indian sector * Campaign: MAR2004 * Basis: Marion Island Research Station * Device: Marine endotherm (MET) * Comment: Mirounga leonina, subadualt male
MAR2004_sel_s_m_17 * Latitude Start: -46.877500 * Longitude Start: 37.861500 * Latitude End: -46.755700 * Longitude End: 37.949900 * Date/Time Start: 2004-04-12T12:00:00 * Date/Time End: 2004-11-22T11:04:00 * Location: Southern Ocean - Indian sector * Campaign: MAR2004 * Basis: Marion Island Research Station * Device: Marine endotherm (MET) * Comment: Mirounga leonina, subadualt male
MAR2004_sel_u_m_09 * Latitude Start: -46.860800 * Longitude Start: 37.820100 * Latitude End: -46.481200 * Longitude End: 52.052200 * Date/Time Start: 2004-04-22T17:52:00 * Date/Time End: 2005-01-09T18:00:00 * Location: Southern Ocean - Indian sector * Campaign: MAR2004 * Basis: Marion Island Research Station * Device: Marine endotherm (MET) * Comment: Mirounga leonina, subadualt male
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535 data points