Como sobreviver a uma extinção em massa: viva arriscadamente e morra jovem!

quarta-feira, abril 06, 2016

Breeding Young as a Survival Strategy during Earth’s Greatest Mass Extinction

Jennifer Botha-Brink, Daryl Codron, Adam K. Huttenlocker, Kenneth D. Angielczyk & Marcello Ruta

Scientific Reports 6, Article number: 24053 (2016)

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Ecological modelling Evolutionary ecology Palaeoecology Palaeontology

Received: 12 October 2015 Accepted: 18 March 2016

Published online: 05 April 2016

An early Triassic Lystrosaurus murrayi specimen, National Museum Bloemfontein, South Africa - Jennifer Botha-Brink.


Studies of the effects of mass extinctions on ancient ecosystems have focused on changes in taxic diversity, morphological disparity, abundance, behaviour and resource availability as key determinants of group survival. Crucially, the contribution of life history traits to survival during terrestrial mass extinctions has not been investigated, despite the critical role of such traits for population viability. We use bone microstructure and body size data to investigate the palaeoecological implications of changes in life history strategies in the therapsid forerunners of mammals before and after the Permo-Triassic Mass Extinction (PTME), the most catastrophic crisis in Phanerozoic history. Our results are consistent with truncated development, shortened life expectancies, elevated mortality rates and higher extinction risks amongst post-extinction species. Various simulations of ecological dynamics indicate that an earlier onset of reproduction leading to shortened generation times could explain the persistence of therapsids in the unpredictable, resource-limited Early Triassic environments, and help explain observed body size distributions of some disaster taxa (e.g., Lystrosaurus). Our study accounts for differential survival in mammal ancestors after the PTME and provides a methodological framework for quantifying survival strategies in other vertebrates during major biotic crises.


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