Inbreeding depression contributes to the maintenance of habitat segregation between closely related monkeyflower species

Katherine Toll, Eric Francis LoPresti & David Bryant Lowry
Incompletely reproductively isolated species often segregate into different microhabitats, even when they are able to survive and reproduce in both habitats. Longer term evolutionary factors may contribute to this lack of cross-habitat persistence. When reproductive interference reduces immigrant fitness, assortative mating, including self-fertilization, increases immigrants’ fitness in a single generation, but longer-term, inbreeding depression may reduce the chance of population persistence. Two California monkeyflower species repeatedly segregate into drier and wetter areas in their zone...
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