AI Article Synopsis
- - The study investigates how extinction selectivity during the Permian-Triassic mass extinction affected different marine animals, focusing on their oxygen-carrying proteins.
- - Marine species with lower oxygen-carrying capacity (like hemerythrin) faced more severe extinction and size reductions compared to those with higher capacities (like hemoglobin or hemocyanin).
- - Findings indicate that animals with higher oxygen-carrying abilities were better equipped to survive hypoxia and ocean acidification, playing a key role in shaping the transition to the Modern Evolutionary Fauna.
Article Abstract
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.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11025005 | PMC |
| http://dx.doi.org/10.1016/j.xinn.2024.100618 | DOI Listing |
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