SELECTION AND GENETIC (CO)VARIANCE IN BIGHORN SHEEP
نویسندگان
چکیده
منابع مشابه
Selection and genetic (co)variance in bighorn sheep.
Genetic theory predicts that directional selection should deplete additive genetic variance for traits closely related to fitness, and may favor the maintenance of alleles with antagonistically pleiotropic effects on fitness-related traits. Trait heritability is therefore expected to decline with the degree of association with fitness, and some genetic correlations between selected traits are e...
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Positive demographic responses have been reported in several species where the immigration or supplementation of genetically distinct individuals into wild populations has resulted in a genetic rescue effect. However, rarely have researchers incorporated what could be considerable risk of outbreeding depression into planning for genetic management programs. We assess the genetic effects of an e...
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Two bighorn sheep (Ovis canadensis) in New Mexico (USA) were found to be naturally infected with Elaeophora schneideri. An adult ram examined in 1997 in the Fra Cristobal Mountains had 26 nematodes in the carotid and iliac arteries, and microfilariae were present in the skin, nasal mucosa, brain, and lungs. This ram was markedly debilitated prior to euthanasia and extensive crusty, scabby lesio...
متن کاملQuantitative genetics and sex-specific selection on sexually dimorphic traits in bighorn sheep.
Sexual conflict at loci influencing traits shared between the sexes occurs when sex-specific selection pressures are antagonistic relative to the genetic correlation between the sexes. To assess whether there is sexual conflict over shared traits, we estimated heritability and intersexual genetic correlations for highly sexually dimorphic traits (horn volume and body mass) in a wild population ...
متن کاملGenetic variation of major histocompatibility complex and microsatellite loci: a comparison in bighorn sheep.
Examining and comparing genetic variation for major histocompatibility complex (MHC) and micro-satellite (MS) loci in the same individuals provides an opportunity to understand the forces influencing genetic variation. We examined five MHC and three MS loci in 235 bighorn sheep (Ovis canadensis) from 14 populations and found that both types of loci were highly variable and were in Hardy-Weinber...
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ژورنال
عنوان ژورنال: Evolution
سال: 2005
ISSN: 0014-3820,1558-5646
DOI: 10.1111/j.0014-3820.2005.tb01786.x