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

AI Article Synopsis

  • A new study challenges the traditional view that winter sea ice is the main feeding ground for krill larvae, revealing that the pack-ice zone is actually low in food.
  • The research indicates that the marginal ice zone offers a better environment for larval growth due to higher food availability.
  • Complex under-ice habitats play a crucial role for krill larvae, providing shelter from predators and access to organic materials, while their behavior of migrating down after sunset enhances their chances of finding food.

Article Abstract

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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Source
http://dx.doi.org/10.1038/s41559-017-0368-3DOI Listing

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