Song Haijun, Wu Yuyang, Dai Xu, Dal Corso Jacopo, Wang Fengyu, Feng Yan, Chu Daoliang, Tian Li, Song Huyue, Foster William J
State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences, China University of Geosciences, Wuhan 430074, China.
Biogéosciences, UMR 6282, CNRS, Université de Bourgogne, 21000 Dijon, France.
Innovation (Camb). 2024 Mar 28;5(3):100618. doi: 10.1016/j.xinn.2024.100618. eCollection 2024 May 6.
Extinction selectivity determines the direction of macroevolution, especially during mass extinction; however, its driving mechanisms remain poorly understood. By investigating the physiological selectivity of marine animals during the Permian-Triassic mass extinction, we found that marine clades with lower O-carrying capacity hemerythrin proteins and those relying on O diffusion experienced significantly greater extinction intensity and body-size reduction than those with higher O-carrying capacity hemoglobin or hemocyanin proteins. Our findings suggest that animals with high O-carrying capacity obtained the necessary O even under hypoxia and compensated for the increased energy requirements caused by ocean acidification, which enabled their survival during the Permian-Triassic mass extinction. Thus, high O-carrying capacity may have been crucial for the transition from the Paleozoic to the Modern Evolutionary Fauna.
灭绝选择性决定了宏观进化的方向，尤其是在大灭绝期间；然而，其驱动机制仍知之甚少。通过研究二叠纪-三叠纪大灭绝期间海洋动物的生理选择性，我们发现，携带氧气能力较低的蚯蚓血红蛋白的海洋类群以及依赖氧气扩散的类群，比携带氧气能力较高的血红蛋白或血蓝蛋白的类群经历了显著更大的灭绝强度和体型缩小。我们的研究结果表明，携带氧气能力高的动物即使在缺氧情况下也能获得所需的氧气，并弥补海洋酸化导致的能量需求增加，这使它们在二叠纪-三叠纪大灭绝期间得以生存。因此，高携带氧气能力可能对从古生代向现代进化动物群的转变至关重要。
