Rummer Jodie L, Stecyk Jonathan A W, Couturier Christine S, Watson Sue-Ann, Nilsson Göran E, Munday Philip L
ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4811, Australia.
Programme for Physiology and Neurobiology, Department of Biosciences, University of Oslo, 0316 Oslo, Norway; Department of Biological Sciences, University of Alaska Anchorage, Anchorage, AK 99508, USA.
Conserv Physiol. 2013 Sep 21;1(1):cot023. doi: 10.1093/conphys/cot023. eCollection 2013.
The uptake of anthropogenic CO2 by the ocean has been suggested to impact marine ecosystems by decreasing the respiratory capacity of fish and other water breathers. We investigated the aerobic metabolic scope of the spiny damselfish, Acanthochromis polyacanthus, from the Great Barrier Reef, Australia when exposed for 17 days to CO2 conditions predicted for the end of the century (946 μatm CO2). Surprisingly, resting O2 consumption rates were significantly lower and maximal O2 consumption rates significantly higher in high-CO2-exposed fish compared with control fish (451 μatm CO2). Consequently, high-CO2-exposed fish exhibited an unexpected increase in absolute (38%) and factorial aerobic scopes (47%). Haematological and muscle water changes associated with exercise were not affected by CO2 treatment. Thus, contrary to predictions, our results suggest that elevated CO2 may enhance aerobic scope of some fish species. Long-term experiments are now required to assess the response to elevated CO2 further, because developmental and transgenerational effects can be dramatic in fish. Ultimately, understanding the variability among species regarding the effects of CO2 on aerobic scope will be critical in predicting the impacts of ocean acidification on marine communities and ecosystems.
海洋对人为排放二氧化碳的吸收被认为会通过降低鱼类和其他水生呼吸生物的呼吸能力来影响海洋生态系统。我们研究了来自澳大利亚大堡礁的多棘雀鲷（Acanthochromis polyacanthus）在暴露于预测的本世纪末二氧化碳条件（946 μatm二氧化碳）下17天后的有氧代谢范围。令人惊讶的是，与对照鱼（451 μatm二氧化碳）相比，暴露于高二氧化碳环境的鱼的静息耗氧率显著降低，最大耗氧率显著升高。因此，暴露于高二氧化碳环境的鱼的绝对有氧范围（38%）和系数有氧范围（47%）出现了意外的增加。与运动相关的血液学和肌肉水分变化不受二氧化碳处理的影响。因此，与预测相反，我们的结果表明升高的二氧化碳可能会增强某些鱼类的有氧范围。现在需要进行长期实验来进一步评估对升高二氧化碳的反应，因为鱼类的发育和跨代效应可能很显著。最终，了解不同物种之间关于二氧化碳对有氧范围影响的变异性对于预测海洋酸化对海洋群落和生态系统的影响至关重要。
