Competition between cryptic species explains variations in rates of lineage evolution.

Proceedings of the National Academy of Sciences of the United States of America
Samuel AlizonVincent A A Jansen

Abstract

Gradual evolution is a common phenomenon in the fossil record of marine microplankton, yet no theoretical model has so far been presented to explain the observed pattern of unidirectionality in trait evolution lasting over tens of millions of generations. Recent molecular genetic data show that the majority of microfossil-producing plankton groups harbors substantial cryptic diversity. Here, we examine the effect of cryptic diversity on apparent rates of lineage evolution. By using a theoretical approach, we show that under resource competition, an increasing number of sibling species within a hypothetical lineage leads to an exponential slowdown of the apparent rate of evolution. This mechanism explains both the remarkable variation in apparent rates of evolution observed in marine plankton, as well as the presence of long gradual evolutionary trends.

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Citations

Feb 5, 2013·Proceedings of the National Academy of Sciences of the United States of America·Luke C Strotz, Andrew P Allen
Jun 3, 2009·BMC Evolutionary Biology·Anton Crombach, Paulien Hogeweg
Jul 9, 2011·PloS One·Javier Montero-PauAfrica Gómez
Dec 10, 2009·Proceedings of the National Academy of Sciences of the United States of America·Pincelli M Hull, Richard D Norris
Apr 23, 2011·Trends in Ecology & Evolution·Lee Hsiang LiowNils Chr Stenseth
Sep 28, 2015·European Journal of Protistology·R Timothy PattersonNawaf A Nasser
Apr 23, 2015·Proceedings of the National Academy of Sciences of the United States of America·Gene HuntScott Lidgard
May 3, 2019·ZooKeys·James CryerRobert Puschendorf

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