Effects of ocean warming and acidification on Atlantic cod and Polar cod ...

• Main Authors: Dahlke, Flemming, Nahrgang, Jasmine, Mortensen, Atle, Puvanendran, Velmurugu, Pörtner, Hans-Otto, Storch, Daniela
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2016
• Subjects: atlantic cod; Barents Sea; Global warming; polar cod
• Online Access: https://dx.doi.org/10.1594/pangaea.868126; https://doi.pangaea.de/10.1594/PANGAEA.868126

Changes in PCO2 and temperature will impact fish populations in future oceans, specifically those living close to their lower or upper thermal limits, such as Atlantic cod (lower) and polar cod (upper) in the sub-arctic Barents Sea. Embryogenesis may represent a bottleneck in this respect since central organ systems supporting homeostasis are not jet fully developed. Embryos are also limited in their ability to compensate for increased metabolic costs possibly associated with acid-base regulation and thermal acclimation. This may lead to trade-offs in resource allocation to vital maintenance functions and developmental processes. Embryos of Atlantic cod and polar cod from the Barents Sea were exposed to factorial combinations of two PCO2 levels (400 and 1100 µatm) and five temperatures (0 to 12 °C for Atlantic cod and 0 to 6 °C for polar cod). In addition to hatching success, we measured oxygen consumption rates (MO2) of embryos as a proxy for metabolic activity, while larval morphology was analysed to ... : Supplement to: Dahlke, Flemming; Butzin, Martin; Nahrgang, Jasmine; Puvanendran, Velmurugu; Mortensen, Atle; Pörtner, Hans-Otto; Storch, Daniela (2018): Northern cod species face spawning habitat losses if global warming exceeds 1.5°C. Science Advances, 4(11), eaas8821 ...