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The effects of inbreeding on fitness and themaintenance of genetic load in metapopulationsof the endangered Glanville fritillarybutterfly (Melitaea cinxia) were examinedin four laboratory experiments. In FinlandM. cinxia occurs as a large metapopulationconsisting of small local populations with fastturnover, whereas in southern France thespecies has a more continuous populationstructure. In the experiments,...
Many populations of endangered species are subject to recurrent introductions of individuals from an alternative setting where selection is either relaxed or in a direction opposite to that in the natural habitat. Such population structures, which are common to captive breeding and hatchery programs, can lead to a scenario in which alleles that are deleterious (and ordinarily keptat low levels) in...
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