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The winter pack-ice zone provides a sheltered but food-poor habitat for larval Antarctic krill
journal contribution
posted on 2023-05-19, 13:28 authored by Meyer, B, Freier, U, Grimm, V, Groeneveld, J, Hunt, BPV, Kerwath, S, King, R, Klaas, C, Pakhomov, E, Klaus MeinersKlaus Meiners, Jessica Melbourne-ThomasJessica Melbourne-Thomas, Murphy, EJ, Thorpe, SE, Stammerjohn, S, Wolf-Gladrow, D, Auerswald, L, Gotz, A, Halbach, L, Jarman, S, So KawaguchiSo Kawaguchi, Krumpen, T, Nehrke, G, Ricker, R, Michael SumnerMichael Sumner, Teschke, M, Rowan TrebilcoRowan Trebilco, Yilmaz, NIA dominant Antarctic ecological paradigm suggests that winter sea ice is generally the main feeding ground for krill larvae. Observations from our winter cruise to the southwest Atlantic sector of the Southern Ocean contradict this view and present the first evidence that the pack-ice zone is a food-poor habitat for larval development. In contrast, the more open marginal ice zone provides a more favourable food environment for high larval krill growth rates. We found that complex under-ice habitats are, however, vital for larval krill when water column productivity is limited by light, by providing structures that offer protection from predators and to collect organic material released from the ice. The larvae feed on this sparse ice-associated food during the day. After sunset, they migrate into the water below the ice (upper 20 m) and drift away from the ice areas where they have previously fed. Model analyses indicate that this behaviour increases both food uptake in a patchy food environment and the likelihood of overwinter transport to areas where feeding conditions are more favourable in spring.
History
Publication title
Nature Ecology and EvolutionPagination
1853-1861ISSN
2397-334XDepartment/School
Institute for Marine and Antarctic StudiesPublisher
Nature Publishing GroupPlace of publication
United KingdomRights statement
© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved.Repository Status
- Restricted