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The Red Queen, Mars, living and dying fast and young: macroevolution in graptoloids

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If you have a question about this talk, please contact Dr Rachael Rhodes .

This talk will summarize a number of recent studies, and ongoing research, based on a remarkable timeseries of evolution and extinction in the graptoloids. This group of organisms was the major component of the macrozooplankton during the Ordovician and Silurian periods, between approximately 480 and 420 million years ago. The data reveal evidence for Milankovitch pacing and diversity dependence of evolution and extinction rates, the dominance of very short-lived, “ephemeral” species, and both distinction and continuity between times of “background” and mass extinction.

This talk is part of the Department of Earth Sciences Seminars (downtown) series.

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