Upward Adaptive Radiation Cascades: Predator Diversification Induced by Prey Diversification

Brodersen, Jakob; Post, David M.; Seehausen, Ole (2018). Upward Adaptive Radiation Cascades: Predator Diversification Induced by Prey Diversification. Trends in ecology & evolution, 33(1), pp. 59-70. Elsevier 10.1016/j.tree.2017.09.016

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The value of biodiversity is widely appreciated, but we are only beginning to understand the interplay of processes that generate biodiversity and their consequences for coevolutionary interactions. Whereas predator–prey coevolution is most often analyzed in the context of evolutionary arms races, much less has been written about how predators are affected by, and respond to, evolutionary diversification in their prey. We hypothesize here that adaptive radiation of prey may lead to diversification and potentially speciation in predators, a process that we call an upwards adaptive radiation cascade. In this paper we lay out the conceptual basis for upwards adaptive radiation cascades, explore evidence for such cascades, and finally advocate for intensified research.

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