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    The winter pack-ice zone provides a sheltered but food-poor habitat for larval Antarctic krill

    Access Status
    Fulltext not available
    Authors
    Meyer, B.
    Freier, U.
    Grimm, V.
    Groeneveld, J.
    Hunt, B.
    Kerwath, S.
    King, R.
    Klaas, C.
    Pakhomov, E.
    Meiners, K.
    Melbourne-Thomas, J.
    Murphy, E.
    Thorpe, S.
    Stammerjohn, S.
    Wolf-Gladrow, D.
    Auerswald, L.
    Götz, A.
    Halbach, L.
    Jarman, Simon
    Kawaguchi, S.
    Krumpen, T.
    Nehrke, G.
    Ricker, R.
    Sumner, M.
    Teschke, M.
    Trebilco, R.
    Yilmaz, N.
    Date
    2017
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Meyer, B. and Freier, U. and Grimm, V. and Groeneveld, J. and Hunt, B. and Kerwath, S. and King, R. et al. 2017. The winter pack-ice zone provides a sheltered but food-poor habitat for larval Antarctic krill. Nat Ecol Evol. 1 (12): pp. 1853-1861.
    Source Title
    Nat Ecol Evol
    DOI
    10.1038/s41559-017-0368-3
    ISSN
    2397-334X
    School
    School of Molecular and Life Sciences (MLS)
    URI
    http://hdl.handle.net/20.500.11937/71281
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 The Author(s). A 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.

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