期刊
NATURE ECOLOGY & EVOLUTION
卷 1, 期 12, 页码 1853-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41559-017-0368-3
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资金
- PACES (Polar Regions and Coasts in a changing Earth System) programme (Topic 1, WP 5) of the Helmholtz Association
- Helmholtz Virtual Institute 'PolarTime' [VH-VI-500]
- Australian Government through Antarctic Science grant [4073]
- Antarctic Climate and Ecosystem Cooperative Research Centre
- Natural Environment Research Council under British Antarctic Survey National Capability-Ecosystems
- Cnes
- Office of Polar Programs (OPP)
- Directorate For Geosciences [1440435] Funding Source: National Science Foundation
- NERC [bas0100035] Funding Source: UKRI
- Natural Environment Research Council [bas0100035] Funding Source: researchfish
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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