Climate change tightens a metabolic constraint on marine habitats
Climate change tightens a metabolic constraint on marine habitats
复制标题
DOI：
10.1126/science.aaa1605
复制
发表时间：
2015-06-05
期刊：
影响因子：
56.9
通讯作者：
Huey, Raymond B.
中科院分区：
文献类型：
--
作者：
Deutsch, Curtis;Ferrel, Aaron;Huey, Raymond B.
海洋变暖以及随之而来的溶解氧（O-2）的损失将改变海洋生态系统，但缺乏预测多种压力源对可生存栖息地影响的机制框架。在这里，我们整合了生理、气候和生物地理数据，校准并绘制了一个关键的代谢指数- O-2供应与静息代谢O-2需求的比例-跨越几种海洋变温动物的地理范围。这些物种在耐热性和低氧耐受性方面存在差异，但它们的当代分布都以类似于2至5的最低代谢指数为界限，在赤道边缘，表明生物体活动的临界能量需求。预计本世纪暖化和O-2损失的综合影响将使全球上层海洋的代谢指数降低约20%，在北部高纬度地区降低约50%，迫使新陈代谢可行的栖息地和物种范围向极地和垂直方向收缩。
Warming of the oceans and consequent loss of dissolved oxygen (O-2) will alter marine ecosystems, but a mechanistic framework to predict the impact of multiple stressors on viable habitat is lacking. Here, we integrate physiological, climatic, and biogeographic data to calibrate and then map a key metabolic index-the ratio of O-2 supply to resting metabolic O-2 demand-across geographic ranges of several marine ectotherms. These species differ in thermal and hypoxic tolerances, but their contemporary distributions are all bounded at the equatorward edge by a minimum metabolic index of similar to 2 to 5, indicative of a critical energetic requirement for organismal activity. The combined effects of warming and O-2 loss this century are projected to reduce the upper ocean's metabolic index by similar to 20% globally and by similar to 50% in northern high-latitude regions, forcing poleward and vertical contraction of metabolically viable habitats and species ranges.