Aspects of krill growth and condition during late winter-early spring off East Antarctica (110-130°E)
作者： C. O’Brien , P. Virtue , S. Kawaguchi , P.D. Nichols
DOI: 10.1016/J.DSR2.2010.11.001
关键词:
摘要: Abstract Antarctic krill, Euphausia superba, is a keystone species in the Southern Ocean. However, information on growth, diet and condition during winter early spring limited, hampering our understanding of these fundamental biological parameters at this important period their lifecycle. Our study assessed larval postlarval krill collected from open water below ice off East Antarctica (110–130oE) September/October 2007. Condition was using lipid content, growth rates digestive gland size; feeding history fatty acid profiles stomach content analysis; 207-day starvation investigated response to long-term food deprivation. Potential items (Calanus propinquus sea-ice biota) were analysed for composition compare with samples. Krill found be good condition, mean rate 0.95% per moult postlarvae 14.79% larvae, 24.1% 6.6% larvae. Fatty analysis revealed two main strategies - mostly diatoms, while those ingesting copepods detritus. had larger glands than water. Furciliae indicated heterotrophic flagellates and/or Postlarval survived 207 days deprivation by body protein reserves energy. In contrast, furciliae severely depleted after just 5 deprivation, indicating that they must feed continually time year. Krill, biota all low polyunsaturated acids, rely later phytoplankton blooms obtain essential nutrients required reproduction.
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