Journal ArticleDOI
Conservation genetics of endangered fish populations in Arizona.
TLDR
Genetic diversity in remnant populations of the Sonoran topminnow Poeciliopsis occidentalis from Arizona is compared with that in populations from Sonora, Mexico, where the fish is widespread and abundant.Abstract:
Genetic diversity in remnant populations of the Sonoran topminnow Poeciliopsis occidentalis (Pisces: Poeciliidae) from Arizona, where the species is endangered, is compared with that in populations from Sonora, Mexico, where the fish is widespread and abundant. Geographically peripheral Arizona populations contain substantially lower levels of genetic variation than do Mexican populations near the center of the species9 range. Allelic differences among three genetically and geographically distinct groups are responsible for 53 percent of the total genetic diversity in this species, 26 percent is due to differences among local populations within the groups, and 21 percent is due to heterozygosity within local populations. Recommendations for conservation and restocking efforts in Arizona are based on these genetic findings.read more
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Inbreeding depression in conservation biology
TL;DR: In three recent cases, introductions into populations with low fitness appeared to restore fitness to levels similar to those before the effects of genetic drift, and the Speke's ...
Journal ArticleDOI
Molecular population structure and the biogeographic history of a regional fauna : a case history with lessons for conservation biology
TL;DR: These concordant phylogeographic patterns among independently evolving species provide evidence of similar vicariant histories of population separation, and can be related tentatively to episodic changes in environmental conditions during the Pleistocene.
Journal ArticleDOI
Hybridization of Bird Species
Peter R. Grant,B. Rosemary Grant +1 more
TL;DR: A longitudinal study of Darwin's finch populations on a Gal�pagos island shows that hybrids exhibit higher fitness than the parental species over several years, and may be at an occasional disadvantage for ecological rather than genetic reasons in this climatically fluctuating environment.
Journal ArticleDOI
Inbreeding and Extinction: A Threshold Effect
TL;DR: Methods were devised to separate genetic and nongenetic causes of extinction in inbred populations, and they were used to analyze data from Drosophila melanogaster, D. virilis and Mus musculus, which showed notably increased extinction beginning at intermediate levels of inbreeding.
Journal ArticleDOI
Conservation units and translocations : strategies for conserving evolutionary processes
TL;DR: It is suggested that the conservation goal should be to conserve ecological and evolutionary processes; rather than to preserve specific phenotypic variants - the products of those processes - to conserve historically isolated sets of populations.
References
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Journal ArticleDOI
Genetic distance between populations
TL;DR: If enough data are available, genetic distance between any pair of organisms can be measured in terms of D, and this measure is applicable to any kind of organism without regard to ploidy or mating scheme.
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BIOSYS-1: a FORTRAN program for the comprehensive analysis of electrophoretic data in population genetics and systematics
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Associations Among Protein Heterozygosity, Growth Rate, and Developmental Homeostasis
and J B Mitton,Michael C. Grant +1 more
TL;DR: The mechanism underlying the phenomenon of heterosis has received a great deal of attention from empiricists and theoreticians, and has been viewed as the consequence of either increased homozygosity at a large or inbreeding depression.
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Rates, sample sizes, and the neutrality hypothesis for electrophoresis in evolutionary studies
TL;DR: It is shown that electrophoretic genetic distance estimates are highly correlated with albumin immunological distances between the same pairs of species.