Recent warming reduces the reproductive advantage of large size and contributes to evolutionary downsizing in nature

David C Fryxell, Alexander N. Hoover, Daniel A. Alvarez, Finn J. Arnesen, Javiera N. Benavente, Emma R. Moffett, Michael T. Kinnison, Kevin S. Simon & Eric P. Palkovacs
Body size is a key functional trait that is predicted to decline under warming. Warming is known to cause size declines via phenotypic plasticity, but evolutionary responses of body size to warming are poorly understood. To test for warming-induced evolutionary responses of body size and growth rates, we used populations of mosquitofish ( Gambusia affinis ) recently established (less than 100 years) from a common source across a strong thermal gradient (19–33°C) created by geothermal...
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