Philopatry, Inbreeding, and the Evolution of Sex
In this comprehensive synthesis, William M. Shields introduces a provocative new hypothesis linking the previously disconnected topics of philopatry, inbreeding, and sex. Shields draws widely from theory and data in genetics, ecology, and behavior in exploring the evolutionary causes and consequences of philopatric (localized) and vagrant dispersal, inbreeding and outbreeding mating systems, and asexual and sexual reproduction. His resulting hypothesis, that philopatry evolved because it increases inbreeding intensity and that inbreeding has survival value, has profound implications for the future study of evolutionary theory.
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adaptive alleles ancestors argument asexuality associated breeding chromosomes coadapted consequences correlation cost of meiosis Crow and Kimura deleterious demes dialects dispersal distances disruption dividuals Dobzhansky Drosophila ecological effective dispersal effective population size environment epistasis evolution evolutionary expected favored female Fisher fitness depression fitness potential fixation frequency function gametes gene flow genomes genotype geographic heterozygotes high fecundity home range homozygotes homozygous hybrid hypothesis implies inbred inbreeding depression inbreeding intensity inbreeding's incest individuals intense inbreeding interacting levels of inbreeding loci locus low fecundity organisms low fecundity species males mating system Maynard Smith Mayr meiosis mutation rates natural populations natural selection novel offspring outbred outbreeding depression panmictic panmixia parental genomes patterns phenotypic philopatry plants pollen predicted produce progeny propagules random ratchet recombinational load reduced relatedness relative reproductive isolation result segregational load selfing sex ratios sexual reproduction similar speciation strategy theoretical tion vertebrates Wright