Data Description

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Citation:
McIntyre, T et al. (2012): Ocean temperature measured by elephant seal-CTDs in the Southern Ocean with links to datasets. doi:10.1594/PANGAEA.793267,
Supplement to: McIntyre, Trevor; Ansorge, Isabelle J; Bornemann, Horst; Plötz, Joachim; Tosh, Cheryl Ann; Bester, Marthán N (2011): Elephant seal dive behaviour is influenced by ocean temperature: implications for climate change impacts on an ocean predator. Marine Ecology Progress Series, 441, 257-272, doi:10.3354/meps09383
Abstract:
The potential effects of ocean warming on marine predators are largely unknown, though the impact on the distribution of prey in vertical space may have far reaching impacts on diving predators such as southern elephant seals. We used data from satellite-tracked southern elephant seals from Marion Island to investigate the relationship between their dive characteristics (dive depths, dive durations and time-at-depth index values) and environmental variables (temperature at depth, depth of maximum temperature below 100 m, frontal zone and bathymetry) as well as other demographic and behavioural variables (migration stage, age-class, track day and vertical diel strategy). While other variables, such as bathymetry and vertical diel strategy also influenced dive depth, our results consistently indicated a significant influence of temperature at depth on dive depths. This relationship was positive for all groups of animals, indicating that seals dived to deeper depths when foraging in warmer waters. Female seals adjusted their dive depths proportionally more than males in warmer water. Dive durations were also influenced by temperature at depth, though to a lesser extent. Results from time-at-depth indices showed that both male and female seals spent less time at targeted dive depths in warmer water, and were presumably less successful foragers when diving in warmer water. Continued warming of the Southern Ocean may result in the distribution of prey for southern elephant seals shifting either poleward and/or to increasing depths. Marion Island elephant seals are expected to adapt their ranging and diving behaviour accordingly, though such changes may result in greater physiological costs associated with foraging.
Project(s):
Coverage:
Median Latitude: -47.066329 * Median Longitude: 35.425393 * South-bound Latitude: -61.344000 * West-bound Longitude: 0.428000 * North-bound Latitude: -32.471000 * East-bound Longitude: 52.052200
Event(s):
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 * * 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 * * 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 * * Comment: Mirounga leonina, subadualt male
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Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Campaign of eventCampaignMetadata
2Event labelEventMetadata
3Author(s) *Author(s)
4Year of Publication *Year
5Title *Title
6Reference/source *Reference
7Uniform resource locator/link to file *URL file
License:
Size:
250 data points

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