Deep divers in even deeper seas : habitat use of male southern elephant seals from Marion Island

Show simple item record McIntyre, Trevor Bornemann, Horst Plotz, Joachim Tosh, Cheryl A. Bester, Marthan Nieuwoudt 2013-07-12T07:39:41Z 2013-08-03T00:20:04Z 2012
dc.description Supplemental material detailing links to dive and track data will be found at S0954102012000570. en
dc.description.abstract We describe the habitat use of 22 male southern elephant seals (Mirounga leonina) satellite tagged at Marion Island between 2004 and 2008. While a few areas of increased utilization appeared to be associated with areas of shallower bathymetry (such as sea-floor ridges and fracture zones), seals in our study did not target other areas of shallow bathymetry within close proximity to Marion Island. Rather, most elephant seals foraged pelagically over very deep water where much variation was evident in diel vertical migration strategies. These strategies resulted in generally deeper and longer dives than what has been reported for male elephant seals from other colonies. No significant differences were recorded for dive durations or dive depths between adults and sub-adults. However, younger animals displayed a positive relationship between dive durations and age, as well as between dive depths and age, while these relationships became negative for older animals. Mixed model outputs suggested that seals increased their aerobic fitness as migrations progressed, enabling them to undertake longer dives. We conclude that Marion Island male elephant seals exhibit much variability in dive strategy and are seemingly capable of exploiting a range of different prey types occurring in various depth layers. en
dc.description.librarian am2013 en
dc.description.librarian ab2013
dc.description.sponsorship The Department of Science and Technology through the National Research Foundation (South Africa), the South African National Antarctic Programme and the Alfred Wegener Institute for Polar and Marine Research (Germany) . en
dc.description.uri en
dc.identifier.citation McIntyre, T, Bornemann, H, Plotz, J, Tosh, CA & Bester, MN 2012, 'Deep divers in even deeper seas : habitat use of male southern elephant seals from Marion Island', Antarctic Science, vol. 24, no. 6, pp. 561–570. en
dc.identifier.issn 0954-1020 (print)
dc.identifier.issn 1365-2079 (online)
dc.identifier.other 10.1017/S0954102012000570
dc.language.iso en en
dc.publisher Cambridge University Press en
dc.rights © Antarctic Science Ltd 2012 en
dc.subject Dive behaviour en
dc.subject Marine mammals en
dc.subject Prince Edward islands en
dc.subject Utilization distribution en
dc.subject.lcsh Southern elephant seal -- Marion Island en
dc.subject.lcsh Habitat (Ecology) en
dc.subject.lcsh Southern elephant seal -- Habitat en
dc.title Deep divers in even deeper seas : habitat use of male southern elephant seals from Marion Island en
dc.type Article en

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