Do pelagic grazers benefit from sea ice? Insights from the Antarctic sea ice proxy IPSO25

Schmidt, K; Brown, TA; Belt, ST; Ireland, LC; Taylor, KWR; Thorpe, SE; Ward, P; Atkinson, A. 2018 Do pelagic grazers benefit from sea ice? Insights from the Antarctic sea ice proxy IPSO25. Biogeosciences, 15. 1987-2006. https://doi.org/10.5194/bg-15-1987-2018

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Official URL: https://www.biogeosciences.net/15/1987/2018/

Abstract/Summary

Sea ice affects primary production in polar regions in multiple ways. It can dampen water column productivity by reducing light or nutrient supply, provide a habitat for ice algae and condition the marginal ice zone (MIZ) for phytoplankton blooms on its seasonal retreat. The relative importance of three different carbon sources (sea ice derived, sea ice conditioned, non-sea-ice associated) for the polar food web is not well understood, partly due to the lack of methods that enable their unambiguous distinction. Here we analysed two highly branched isoprenoid (HBI) biomarkers to trace sea-ice-derived and sea-ice-conditioned carbon in Antarctic krill (Euphausia superba) and relate their concentrations to the grazers’ body reserves, growth and recruitment. During our sampling in January–February 2003, the proxy for sea ice diatoms (a di-unsaturated HBI termed IPSO25, �13CD

Item Type: Publication - Article
Subjects: Ecology and Environment
Oceanography
Divisions: Plymouth Marine Laboratory > Science Areas > Marine Ecology and Biodiversity
Depositing User: Angus Atkinson
Date made live: 26 Apr 2018 15:55
Last Modified: 26 Apr 2018 15:55
URI: http://plymsea.ac.uk/id/eprint/7863

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