How elasmobranch species fared during and after the K-Pg mass extinction event sciencemagazine
Diversification and diversity dynamics of all elasmobranch species. Bayesian estimations of speciation and extinction rates through time as inferred by PyRate using reversible jump Markov Chain Monte Carlo. Marginal estimates of speciation rates and extinction rates through time are shown as mean and 95% credibility intervals .
Scientists have learned a lot about what happened after the Chicxulub impactor crashed into the Earth approximately 66 million years ago. The violent impact and its aftermath led to widespreadof approximately 55% to 76% of all the planet's creatures—including all of the non-bird dinosaurs. But most findings involve the impact on land-based ecosystems—much less is known about what happened to the sea life.
Elasmobranch species include sharks, rays, skates and sawfish. To learn about what happened to them after the massive asteroid strike, Guinot and Condamine scoured information in datasets around the world describing elasmobranch fossil specimens that have been found and studied over the years. In particular, they were looking atThey found that the number of species of elasmobranch overall declined by over 62% following the asteroid strike, and some species of elasmobranch hadthan others.
More specific results included the discovery that rays that fed on shellfish did not fare well; neither did older species of sharks. Combined, they had an extinction rate of 72%. On the other hand, species that lived in the higher latitudes and lived over large geographic ranges not only had higher initial survival rates, but also recovered more quickly than other species.
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