Elevated temperature reduces the respiratory scope of coral reef fishes
Elevated temperature reduces the respiratory scope of coral reef fishes
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DOI：
10.1111/j.1365-2486.2008.01767.x
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发表时间：
2009-06-01
影响因子：
11.6
通讯作者：
Munday, Philip L.
中科院分区：
文献类型：
--
作者：
Nilsson, Goran E.;Crawley, Natalie;Munday, Philip L.
据预测，海洋鱼类需氧(需氧范围)的能力将控制它们的耐热性，从而控制快速气候变化对其种群的影响。我们在澳大利亚大堡礁北部的蜥蜴岛上测试了水温升高对五种常见珊瑚礁鱼类休眠和最大耗氧率的影响。在水温升高(31、32或33摄氏度)时，所有物种的有氧能力都比对照(29摄氏度)有所下降；然而，与三种豆科鱼类Dascyllus anuarus、Chromis triprtoraris和Acanthochromis Polyacanus相比，两种红鳍金枪鱼的反应要强得多。与29摄氏度相比，这两种红鱼在31摄氏度时的有氧活动范围减少了近一半，几乎所有额外摄氧量的能力都在33摄氏度时耗尽。相比之下，这三种豆科鱼在33摄氏度时保持了一半以上的有氧活动范围。在较高的温度下，耐热物种的种群可能会持续存在，但如果个体表现低于维持可生存种群所需的水平，低纬度珊瑚礁上的热敏感物种种群可能会下降。
The capacity for marine fishes to perform aerobically (aerobic scope) is predicted to control their thermal tolerance and, thus, the impact that rapid climate change will have on their populations. We tested the effect of increased water temperatures on the resting and maximum rates of oxygen consumption in five common coral reef fishes at Lizard Island on the northern Great Barrier Reef, Australia. All species exhibited a decline in aerobic capacity at elevated water temperatures (31, 32 or 33 degrees C) compared with controls (29 degrees C); however, the response was much stronger in two cardinalfishes, Ostorhinchus cyanosoma and O. doederleini, compared with three damselfishes, Dascyllus anuarus, Chromis atripectoralis and Acanthochromis polyacanthus. Aerobic scope of the two cardinalfishes was reduced by nearly half at 31 degrees C compared with 29 degrees C, and virtually all capacity for additional oxygen uptake was exhausted by 33 degrees C. In contrast, the three damselfishes retained over half their aerobic scope at 33 degrees C. Such differences in thermal tolerance between species, and possibly families, suggest that the community structure of reef fish assemblages might change significantly as ocean temperatures increase. Populations of thermally tolerant species are likely to persist at higher temperatures, but populations of thermally sensitive species could decline on low-latitude reefs if individual performance falls below levels needed to sustain viable populations.