What causes a group to flourish or decline over geological time scales and large geographical scales? Researchers at the Institut des Sciences de l’Evolution de Montpellier (ISEM – CNRS/EPHE/IRD/Université de Montpellier) led by Fabien Condamine have now shown that both climate cooling and competition with its sister group, the ground sharks (Carcharhiniformes), mackerel sharks (Lamniformes), including the great white shark, had a great impact, leading to the extinction of the species. These results, reported in PNAS, imply that the interaction between abiotic and biotic factors played an important role in extinction and speciation, respectively, and influenced the sequential increase and decline of these marine predators.
Read the research paper: Condamine F.L., Romieu J. & Guinot G. Climate cooling and clade competition likely drove the decline of lamniform sharks. Proceedings of the National Academy of Sciences 10.1073/pnas.1902693116