Speaker
Dr. Chris Funk
Speaker's Institution
CSU
Date
10/18/17
Time
4:00 PM
Location
Biology Auditorium 136
Mixer Time
3:30 PM
Mixer Location
Biology SW Lobby
Additional Information

The consequence of gene flow for local adaptation and fitness is a fundamental, yet unresolved, problem in evolutionary ecology and conservation biology. On the one hand, gene flow may introduce maladaptive alleles into a population, thereby reducing fitness. On the other hand, gene flow can add genetic variation to small, inbred populations, increasing fitness through genetic rescue. This is also an important question in conservation, since augmentation of small and declining populations is an important, yet rarely tested, management tool. Here, I will present the results of collaborative field and mesocosm (lab) experiments in which we used Trinidadian guppies to test the multigenerational effects of gene flow on phenotypes, fitness, and demography. In our field experiments, we found that gene flow from adaptively divergent immigrants did not disrupt locally adapted phenotypes. Rather, gene flow increased individual fitness and population sizes of small, inbred populations. In our mesocosm experiment, treatments that received divergent immigrants maintained greater genetic diversity, abundance, and hybrid fitness than controls that received immigrants from the source used to seed the mesocosms. Our results support a growing body of research suggesting that immigrants can increase population fitness even when they are divergent.

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