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Differences in the respiratory response to temperature and hypoxia across four life-stages of the intertidal porcelain crab Petrolisthes laevigatus
Marine Biology ( IF 2.4 ) Pub Date : 2018-08-23 , DOI: 10.1007/s00227-018-3406-z
Félix P Leiva 1, 2 , Cristóbal Garcés 1 , Wilco C E P Verberk 2 , Macarena Care 1 , Kurt Paschke 3, 4 , Paulina Gebauer 1
Affiliation  

For aquatic breathers, hypoxia and warming can act synergistically causing a mismatch between oxygen supply (reduced by hypoxia) and oxygen demand (increased by warming). The vulnerability of these species to such interactive effects may differ during ontogeny due to differing gas exchange systems. This study examines respiratory responses to temperature and hypoxia across four life-stages of the intertidal porcelain crab Petrolisthes laevigatus. Eggs, megalopae, juveniles and adults were exposed to combinations of temperatures from 6 to 18 °C and oxygen tensions from 2 to 21 kPa. Metabolic rates differed strongly across life-stages which could be partly attributed to differences in body mass. However, eggs exhibited significantly lower metabolic rates than predicted for their body mass. For the other three stages, metabolic rates scaled with a mass exponent of 0.89. Mass scaling exponents were similar across all temperatures, but were significantly influenced by oxygen tension (the highest at 9 and 14 kPa, and the lowest at 2 kPa). Respiratory responses across gradients of oxygen tension were used to calculate the response to hypoxia, whereby eggs, megalopae and juveniles responded as oxyconformers and adults as oxyregulators. The thermal sensitivity of the metabolic rates (Q10) were dependent on the oxygen tension in megalopae, and also on the interaction between oxygen tension and temperature intervals in adults. Our results thus provide evidence on how the oxygen tension can modulate the mass dependence of metabolic rates and demonstrate changes in respiratory control from eggs to adults. In light of our results indicating that adults show a good capacity for maintaining metabolism independent of oxygen tension, our study highlights the importance of assessing responses to multiple stressors across different life-stages to determine how vulnerability to warming and hypoxia changes during development.

中文翻译:

潮间带瓷蟹 Petrolisthes laevigatus 四个生命阶段呼吸对温度和缺氧反应的差异

对于水中呼吸者来说,缺氧和变暖可以协同作用,导致氧气供应(因缺氧而减少)和需氧量(因变暖而增加)之间的不匹配。由于不同的气体交换系统,这些物种在个体发育过程中对这种相互作用的脆弱性可能会有所不同。这项研究检查了潮间带瓷蟹 Petrolisthes laevigatus 四个生命阶段对温度和缺氧的呼吸反应。鸡蛋、巨蜥、幼鱼和成虫暴露于 6 至 18 °C 的温度和 2 至 21 kPa 的氧气张力的组合中。不同生命阶段的代谢率差异很大,这可能部分归因于体重的差异。然而,鸡蛋表现出的代谢率明显低于对其体重的预测。对于其他三个阶段,代谢率以 0.89 的质量指数成比例。质量标度指数在所有温度下都相似,但受氧张力显着影响(在 9 和 14 kPa 时最高,在 2 kPa 时最低)。跨氧张力梯度的呼吸反应被用来计算对缺氧的反应,其中鸡蛋、巨蜥和幼鱼作为氧合子反应,成虫作为氧调节剂。代谢率 (Q10) 的热敏感性取决于巨蜥的氧分压,以及成虫氧分压和温度间隔之间的相互作用。因此,我们的结果为氧张力如何调节代谢率的质量依赖性提供了证据,并证明了从鸡蛋到成人的呼吸控制变化。
更新日期:2018-08-23
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