Interactive effects of ocean acidification and temperature on oxygen uptake rates in Calanus hyperboreus nauplii

Frontiers in Marine Science

Marine Science

Vanessa Pitusi¹  Christine Gawinski²  Martin Graeve³  Nadjejda Espinel-Velasco⁴  Haakon Hop⁴  Doreen Kohlbach⁴ 

[1] Department of Arctic Biology, The University Centre in Svalbard (UNIS), Longyearbyen, Norway;Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, UiT The Arctic University of Norway, Tromsø, Norway;Ecological Chemistry, Alfred-Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany;Norwegian Polar Institute, Fram Centre, Tromsø, Norway;

关键词: Arctic copepods;    early-life stages;    metabolism;    energy reserves;    Barents Sea;    environmental drivers;    climate change;    The Nansen Legacy;   

DOI  :  10.3389/fmars.2023.1240673

 received in 2023-06-15, accepted in 2023-10-12,  发布年份 2023

来源: Frontiers

【 摘 要 】

The Arctic region is undergoing rapid and significant changes, characterized by high rates of acidification and warming. These transformations prompt critical questions about the resilience of marine communities in the face of environmental change. In the Arctic, marine zooplankton and in particular calanoid copepods play a vital role in the food web. Changes in environmental conditions could disrupt zooplankton communities, posing detrimental consequences for the entire ecosystem. Copepod early-life stages have been shown to be particularly sensitive to environmental stressors since they represent a bottleneck in the life cycle. Here, we investigated the responses of 4-day old Calanus hyperboreus nauplii when exposed to acidification (pH 7.5 and 8.1) and warming (0 and 3°C), both independently and in combination. Naupliar respiration rates increased when exposed to a combination of acidification and warming, but not when exposed to the stressors individually. Moreover, we found no discernible differences in lipid content and fatty acid (FA) composition of the nauplii across the different experimental treatments. Wax esters accounted for approximately 75% of the lipid reserves, and high amounts of long chain fatty acids 20:1 and 22:1, crucial for the reproduction cycle in copepods, were also detected. Our results indicate a sensitivity of these nauplii to a combination of acidification and warming, but not to the individual stressors, aligning with a growing body of evidence from related studies. This study sheds light on the potential implications of global change for Arctic copepod populations by elucidating the responses of early-life stages to these environmental stressors.

【 授权许可】

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Copyright © 2023 Espinel-Velasco, Gawinski, Kohlbach, Pitusi, Graeve and Hop