Lipid content in overwintering Calanus finmarchicus across the Subpolar Eastern North Atlantic Ocean

Sigrún Huld Jónasdóttir, Robert J. Wilson, Astthor Gislason, Michael R. Heath

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5 Citations (Scopus)
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Abstract

The boreal copepod Calanus finmarchicus accumulates lipid reserves during summer feeding in surface ocean waters, which enable it to stay at depth and survive famine during overwintering. Respiration of lipids during prolonged overwintering at ocean depths (> 1000 m in some areas) has been shown to result in a net sequestration of carbon into the deep ocean: the so-called “lipid pump.” Here, we provide a comprehensive synthesis of the geographic and vertical variations in lipid content of overwintering animals across the Subpolar Eastern North Atlantic and, on the basis of this, we revise the estimates of carbon sequestration. Wax ester content ranged from 40 to 190 μg individual −1 at > 250 m depths, with highest concentrations in the coldest (< 0°C) waters at 400–600 m depth at the slope east of Faroe Islands and east of Greenland and lowest in the warmer (> 4°C) Irminger Sea and Rockall Basin. Our new analysis results in about 44% higher estimates of carbon sequestration at up to 11.5 g C m −2.

Original languageEnglish
Pages (from-to)2029-2043
Number of pages15
JournalLimnology and Oceanography
Volume64
Issue number5
Early online date26 Mar 2019
DOIs
Publication statusPublished - 30 Sep 2019

Keywords

  • calanus finmarchicus
  • wax ester reserves
  • diapause duration
  • overwintering
  • winter distribution
  • lipid pump
  • carbon sequestration

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