Seasonal variability in resilience of a coral reef fish to marine heatwaves and hypoxia
Seasonal variability in resilience of a coral reef fish to marine heatwaves and hypoxia
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珊瑚礁鱼对海洋热浪和缺氧的适应能力的季节性变化
DOI：
10.1111/gcb.16624
复制
发表时间：
2023
影响因子：
11.6
通讯作者：
J. L. Johansen
中科院分区：
文献类型：
--
作者：
L. Tran;J. L. Johansen
气候变化预测表明，全年热带海洋热浪（MHW）更加频繁和严重，并伴随着缺氧。然而，大多数研究都集中在夏季高峰条件下，假设年度最高气温将引起最大的生理后果。本研究通过表征季节性 MHW（即平均、最大和累积强度、持续时间、升温速率和平均年发生率）并将适应冬季和夏季的罪犯唐螈 (Acanthurus triostegus) 的代谢特征（即标准代谢率 (SMR)、SMR 的 Q10、最大代谢率 (MMR)、有氧范围和临界氧张力 (Pcrit)）与MHW 和缺氧的综合影响。将鱼暴露于六种最高强度随季节变化的 MHW 处理中的一种（冬季：24.5、26.5、28.5°C；夏季：28.5、30.5、32.5°C），代表 IPCC 预测下过去和未来的 MHW（即 +0、+2、+4°C）。令人惊讶的是，季节之间的 MHW 特征没有显着差异，但 SMR 对冬季 MHW（平均 Q10 = 2.92）比夏季 MHW（平均 Q10 = 1.81）更敏感，尽管夏季绝对温度较高。同时，冬季 +2 和 +4°C 处理（即 26.5、28.5°C）和所有夏季 MHW 处理之间的 MMR 增加相似，表明 MMR 最大增加存在上限。有氧范围在季节之间和 MHW 处理之间没有显着差异。虽然平均 Pcrit 在季节之间没有显着变化，但与冬季对照组相比，冬季升温 +4°C（即 28.5°C）显着增加了 Pcrit。与一年中最温暖时节对 MHW 的敏感性增加的想法相反，我们的研究结果表明，对冬季 MHW 的有害影响的敏感性更高，并且对温暖夏季条件的季节性适应可能会增强代谢对变暖和缺氧的适应能力。因此，对 MHW 和缺氧的生理敏感性可能会比之前预期的在一年中更大的时间范围内延伸，这强调了在凉爽季节评估气候变化影响的重要性，因为许多物种都出现了与健康相关的基本特征，例如繁殖。
Climate change projections indicate more frequent and severe tropical marine heatwaves (MHWs) and accompanying hypoxia year‐round. However, most studies have focused on peak summer conditions under the assumption that annual maximum temperatures will induce the greatest physiological consequences. This study challenges this idea by characterizing seasonal MHWs (i.e., mean, maximum, and cumulative intensities, durations, heating rates, and mean annual occurrence) and comparing metabolic traits (i.e., standard metabolic rate (SMR), Q10 of SMR, maximum metabolic rate (MMR), aerobic scope, and critical oxygen tension (Pcrit)) of winter‐ and summer‐acclimatized convict tang (Acanthurus triostegus) to the combined effects of MHWs and hypoxia. Fish were exposed to one of six MHW treatments with seasonally varying maximum intensities (winter: 24.5, 26.5, 28.5°C; summer: 28.5, 30.5, 32.5°C), representing past and future MHWs under IPCC projections (i.e., +0, +2, +4°C). Surprisingly, MHW characteristics did not significantly differ between seasons, yet SMR was more sensitive to winter MHWs (mean Q10 = 2.92) than summer MHWs (mean Q10 = 1.81), despite higher absolute summer temperatures. Concurrently, MMR increased similarly among winter +2 and +4°C treatments (i.e., 26.5, 28.5°C) and all summer MHW treatments, suggesting a ceiling for maximal MMR increase. Aerobic scope did not significantly differ between seasons nor among MHW treatments. While mean Pcrit did not significantly vary between seasons, warming of +4°C during winter (i.e., 28.5°C) significantly increased Pcrit relative to the winter control group. Contrary to the idea of increased sensitivity to MHWs during the warmest time of year, our results reveal heightened sensitivity to the deleterious effects of winter MHWs, and that seasonal acclimatization to warmer summer conditions may bolster metabolic resilience to warming and hypoxia. Consequently, physiological sensitivity to MHWs and hypoxia may extend across larger parts of the year than previously expected, emphasizing the importance of evaluating climate change impacts during cooler seasons when essential fitness‐related traits such as reproduction occur in many species.
DOI：
--
发表时间：
2015-10
期刊：
--
影响因子：
--
作者：
Douglas M. Bates;M. Maechler;Ben Bolker;Steven C. Walker
通讯作者：
Douglas M. Bates;M. Maechler;Ben Bolker;Steven C. Walker
影响因子：
16.6
作者：
Oliver ECJ;Donat MG;Burrows MT;Moore PJ;Smale DA;Alexander LV;Benthuysen JA;Feng M;Sen Gupta A;Hobday AJ;Holbrook NJ;Perkins-Kirkpatrick SE;Scannell HA;Straub SC;Wernberg T
通讯作者：
Wernberg T
DOI：
10.1016/j.cbpa.2014.05.011
发表时间：
2014-09
影响因子：
2.3
作者：
Bowden, A. J.;Gardiner, N. M.;Couturier, C. S.;Stecyk, J. A. W.;Nilsson, G. E.;Munday, P. L.;Rummer, J. L.
通讯作者：
Rummer, J. L.