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Aerobic capacities and swimming performance of polar cod (Boreogadus saida) under ocean acidification and warming conditions.
Kunz, Kristina Lore; Claireaux, Guy; Pörtner, Hans-Otto; Knust, Rainer; Mark, Felix Christopher.
Afiliación
  • Kunz KL; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bentho-Pelagic Processes, Am Alten Hafen 26, 27568 Bremerhaven, Germany.
  • Claireaux G; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Integrative Ecophysiology, Am Handelshafen 12, 27570 Bremerhaven, Germany.
  • Pörtner HO; University of Bremen, Fachbereich 2, NW 2/Leobener Strasse, 28359 Bremen, Germany.
  • Knust R; Université de Bretagne Occidentale, LEMAR (UMR 6539), Unité PFOM, Laboratoire ARN, Centre Ifremer de Brest, 29280 Plouzané, France.
  • Mark FC; Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Integrative Ecophysiology, Am Handelshafen 12, 27570 Bremerhaven, Germany.
J Exp Biol ; 221(Pt 21)2018 10 31.
Article en En | MEDLINE | ID: mdl-30190318
Polar cod (Boreogadus saida) is an important prey species in the Arctic ecosystem, yet its habitat is changing rapidly: climate change, through rising seawater temperatures and CO2 concentrations, is projected to be most pronounced in Arctic waters. This study aimed to investigate the influence of ocean acidification and warming on maximum performance parameters of B. saida as indicators for the species' acclimation capacities under environmental conditions projected for the end of this century. After 4 months at four acclimation temperatures (0, 3, 6, 8°C) each combined with two PCO2  levels (390 and 1170 µatm), aerobic capacities and swimming performance of B. saida were recorded following a Ucrit protocol. At both CO2 levels, standard metabolic rate (SMR) was elevated at the highest acclimation temperature indicating thermal limitations. Maximum metabolic rate (MMR) increased continuously with temperature, suggesting an optimum temperature for aerobic scope for exercise (ASex) at 6°C. Aerobic swimming performance (Ugait) increased with acclimation temperature irrespective of CO2 levels, while critical swimming speed (Ucrit) did not reveal any clear trend with temperature. Hypercapnia evoked an increase in MMR (and thereby ASex). However, swimming performance (both Ugait and Ucrit) was impaired under elevated near-future PCO2  conditions, indicating reduced efficiencies of oxygen turnover. The contribution of anaerobic metabolism to swimming performance was very low overall, and further reduced under hypercapnia. Our results revealed high sensitivities of maximum performance parameters (MMR, Ugait, Ucrit) of B. saida to ocean acidification. Impaired swimming capacity under ocean acidification may reflect reduced future competitive strength of B. saida.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Agua de Mar / Natación / Gadiformes / Calentamiento Global Límite: Animals Idioma: En Revista: J Exp Biol Año: 2018 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Reino Unido
Texto completo
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Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Agua de Mar / Natación / Gadiformes / Calentamiento Global Límite: Animals Idioma: En Revista: J Exp Biol Año: 2018 Tipo del documento: Article País de afiliación: Alemania Pais de publicación: Reino Unido