Contrasting physiological responses to future ocean acidification among Arctic copepod populations

Peter Thor*, Allison Bailey, Sam Dupont, Piero Calosi, Janne E Søreide, Pierre De Wit, Ella Guscelli, Lea Loubet-Sartrou, Ida Marie Deichmann, Martin Milton Candee, Camilla Svensen, Andrew L King, Richard G. J. Bellerby

*Corresponding author for this work

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Abstract

Widespread ocean acidification (OA) is modifying the chemistry of the global ocean, and the Arctic is recognised as the region where the changes will progress at the fastest rate. Moreover, Arctic species show lower capacity for cellular homeostasis and acid-base regulation rendering them particularly vulnerable to OA. In the present study, we found physiological differences in OA response across geographically separated populations of the keystone Arctic copepod Calanus glacialis. In copepodite stage CIV, measured reaction norms of ingestion rate and metabolic rate showed severe reductions in ingestion and increased metabolic expenses in two populations from Svalbard (Kongsfjord and Billefjord) whereas no effects were observed in a population from the Disko Bay, West Greenland. At pHT 7.87, which has been predicted for the Svalbard west coast by year 2100, these changes resulted in reductions in scope for growth of 19% in the Kongsfjord and a staggering 50% in the Billefjord. Interestingly, these effects were not observed in stage CV copepodites from any of the three locations. It seems that CVs may be more tolerant to OA perhaps due to a general physiological reorganisation to meet low intracellular pH during hibernation. Needless to say, the observed changes in the CIV stage will have serious implications for the C. glacialis population health status and growth around Svalbard. However, OA tolerant populations such as the one in the Disko Bay could help to alleviate severe effects in C. glacialis as a species. This article is protected by copyright. All rights reserved.
Original languageEnglish
JournalGlobal Change Biology
Volume24
Issue number1
Pages (from-to)365-377
ISSN1354-1013
DOIs
Publication statusPublished - 2018

Keywords

  • pH
  • Arctic
  • Ocean acidification
  • Ingestion rate
  • Metabolic rate
  • pCO2
  • Reaction norm
  • ZOOPLANKTON FECAL PELLETS

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