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Nachtsheim, Dominik A; Ryan, Svenja; Schröder, Michael; Jensen, Laura; Oosthuizen, W Christiaan; Bester, Marthán N; Hagen, Wilhelm; Bornemann, Horst (2017): At surface behaviour at location on spot, dive depth profile, and water temperature and salinity data of Weddell seals from Filchner Trough in 2014. PANGAEA, https://doi.org/10.1594/PANGAEA.871104, Supplement to: Nachtsheim, DA et al. (2019): Foraging behaviour of Weddell seals (Leptonychotes weddellii) in connection to oceanographic conditions in the southern Weddell Sea. Progress in Oceanography, 173, 165-179, https://doi.org/10.1016/j.pocean.2019.02.013

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Abstract:
The region of the Filchner Outflow System (FOS) in the southeastern Weddell Sea is characterized by intensive and complex interactions of different water masses. Dense Ice Shelf Water (ISW) emerging from beneath the ice shelf cavities on the continental shelf, meets Modified Warm Deep Water (MWDW) originating from the Antarctic Circumpolar Current at the sill of the Filchner Trough. These hydrographic features convert the FOS into an oceanographic key region, which may also show enhanced biological productivity and corresponding aggregations of marine top predators. In this context, six adult Weddell seals (Leptonychotes weddellii) were instrumented with CTD-combined satellite relay data loggers in austral summer 2014. By means of these long-term data loggers we aimed at investigating the influence of environmental conditions on the seals' foraging behaviour throughout seasons, focussing on the local oceanographic features. Weddell seals performed pelagic and demersal dives, mainly on the continental shelf, where they presumably exploited the abundant bentho-pelagic fish fauna. Diurnal and seasonal variations in light availability affected foraging activities. MWDW was associated with increased foraging effort. However, we observed differences in movements and habitat use between two different groups of Weddell seals. Seals tagged in the pack ice of the FOS focussed their foraging activities to the western and, partly, eastern flank of the Filchner Trough, which coincides with inflow pathways of MWDW. In contrast, Weddell seals tagged on the coastal fast ice exhibited typical central-place foraging and utilized resources close to their colony. High foraging effort in MWDW and high utilization of areas associated with an inflow of MWDW raise questions on the underlying biological features. This emphasizes the importance of further interdisciplinary ecological investigations in the near future, as the FOS may soon be impacted by predicted climatic changes.
Project(s):
Coverage:
Median Latitude: -74.759102 * Median Longitude: -29.044996 * South-bound Latitude: -77.878000 * West-bound Longitude: -43.570000 * North-bound Latitude: -71.230000 * East-bound Longitude: -23.865000
Date/Time Start: 2014-01-21T21:11:00 * Date/Time End: 2014-10-06T06:27:33
Size:
24 datasets

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Datasets listed in this publication series

  1. Bornemann, H; Nachtsheim, DA; Oosthuizen, WC et al. (2016): Dive depth profile of Weddell seal FIL2014_wed_a_f_01 from Filchner Trough. https://doi.org/10.1594/PANGAEA.861888
  2. Bornemann, H; Nachtsheim, DA; Oosthuizen, WC et al. (2016): Dive depth profile of Weddell seal FIL2014_wed_a_f_04 from Filchner Trough. https://doi.org/10.1594/PANGAEA.861889
  3. Bornemann, H; Nachtsheim, DA; Oosthuizen, WC et al. (2016): Dive depth profile of Weddell seal FIL2014_wed_a_f_05 from Filchner Trough. https://doi.org/10.1594/PANGAEA.861890
  4. Bornemann, H; Nachtsheim, DA; Oosthuizen, WC et al. (2016): Dive depth profile of Weddell seal FIL2014_wed_a_f_06 from Filchner Trough. https://doi.org/10.1594/PANGAEA.861891
  5. Bornemann, H; Nachtsheim, DA; Oosthuizen, WC et al. (2016): Dive depth profile of Weddell seal FIL2014_wed_a_f_07 from Filchner Trough. https://doi.org/10.1594/PANGAEA.861892
  6. Bornemann, H; Nachtsheim, DA; Oosthuizen, WC et al. (2016): Dive depth profile of Weddell seal FIL2014_wed_a_m_03 from Filchner Trough. https://doi.org/10.1594/PANGAEA.861894
  7. Bornemann, H; Oosthuizen, WC; Schröder, M et al. (2014): At surface behaviour at location on spot of Weddell seal FIL2014_wed_a_f_01 from Filchner Trough. https://doi.org/10.1594/PANGAEA.839716
  8. Bornemann, H; Oosthuizen, WC; Schröder, M et al. (2014): At surface behaviour at location on spot of Weddell seal FIL2014_wed_a_f_04 from Filchner Trough. https://doi.org/10.1594/PANGAEA.839718
  9. Bornemann, H; Oosthuizen, WC; Schröder, M et al. (2014): At surface behaviour at location on spot of Weddell seal FIL2014_wed_a_f_05 from Filchner Trough. https://doi.org/10.1594/PANGAEA.839719
  10. Bornemann, H; Oosthuizen, WC; Schröder, M et al. (2014): At surface behaviour at location on spot of Weddell seal FIL2014_wed_a_f_06 from Filchner Trough. https://doi.org/10.1594/PANGAEA.839720
  11. Bornemann, H; Oosthuizen, WC; Schröder, M et al. (2014): At surface behaviour at location on spot of Weddell seal FIL2014_wed_a_f_07 from Filchner Trough. https://doi.org/10.1594/PANGAEA.839721
  12. Bornemann, H; Oosthuizen, WC; Schröder, M et al. (2014): At surface behaviour at location on spot of Weddell seal FIL2014_wed_a_m_03 from Filchner Trough. https://doi.org/10.1594/PANGAEA.839723
  13. Bornemann, H; Oosthuizen, WC; Schröder, M et al. (2014): Water temperature and salinity data from Weddell seal FIL2014_wed_a_f_01 from Filchner Trough. https://doi.org/10.1594/PANGAEA.839692
  14. Bornemann, H; Oosthuizen, WC; Schröder, M et al. (2014): Water temperature and salinity data from Weddell seal FIL2014_wed_a_f_04 from Filchner Trough. https://doi.org/10.1594/PANGAEA.839693
  15. Bornemann, H; Oosthuizen, WC; Schröder, M et al. (2014): Water temperature and salinity data from Weddell seal FIL2014_wed_a_f_05 from Filchner Trough. https://doi.org/10.1594/PANGAEA.839694
  16. Bornemann, H; Oosthuizen, WC; Schröder, M et al. (2014): Water temperature and salinity data from Weddell seal FIL2014_wed_a_f_06 from Filchner Trough. https://doi.org/10.1594/PANGAEA.839695
  17. Bornemann, H; Oosthuizen, WC; Schröder, M et al. (2014): Water temperature and salinity data from Weddell seal FIL2014_wed_a_f_07 from Filchner Trough. https://doi.org/10.1594/PANGAEA.839696
  18. Bornemann, H; Oosthuizen, WC; Schröder, M et al. (2014): Water temperature and salinity data from Weddell seal FIL2014_wed_a_m_03 from Filchner Trough. https://doi.org/10.1594/PANGAEA.839698
  19. Nachtsheim, DA; Ryan, S; Schröder, M et al. (2018): Reprocessed water temperature and salinity data from Weddell seal FIL2014_wed_a_f_04 from Filchner Trough. https://doi.org/10.1594/PANGAEA.895927
  20. Nachtsheim, DA; Ryan, S; Schröder, M et al. (2018): Reprocessed water temperature and salinity data from Weddell seal FIL2014_wed_a_f_05 from Filchner Trough. https://doi.org/10.1594/PANGAEA.895928
  21. Nachtsheim, DA; Ryan, S; Schröder, M et al. (2018): Reprocessed water temperature and salinity data from Weddell seal FIL2014_wed_a_f_06 from Filchner Trough. https://doi.org/10.1594/PANGAEA.895930
  22. Nachtsheim, DA; Ryan, S; Schröder, M et al. (2018): Reprocessed water temperature and salinity data from Weddell seal FIL2014_wed_a_f_07 from Filchner Trough. https://doi.org/10.1594/PANGAEA.895931
  23. Nachtsheim, DA; Ryan, S; Schröder, M et al. (2018): Reprocessed water temperature and salinity data from Weddell seal FIL2014_wed_a_m_03 from Filchner Trough. https://doi.org/10.1594/PANGAEA.895926
  24. Nachtsheim, DA; Ryan, S; Schröder, M et al. (2018): Reprocessed water temperature and salinity data from Weddell seal FIL2014_wed_a_f_01 from Filchner Trough. https://doi.org/10.1594/PANGAEA.895871