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further studies on horn aberrations in dall's sheep (ovis dalli dalli) from yukon territory, canada.the prevalence of horn aberrations in dall's sheep from the kluane lake area of yukon territory observed during july 1982 represented 1% of the total population and 7% of rams 6 yr or older. ewes were not considered in these percentages because they were too difficult to inspect by aerial survey. when these data were combined with other data collected from 1977 through 1981, the prevalence equalled 2.4% of the total population and slightly exceeded 16% in mature rams (greater than or equal to 6 ...19846737607
population genetic structure of north american thinhorn sheep (ovis dalli).the thinhorn sheep (ovis dalli ssp.) provides a rare example of a north american large mammal that occupies most of its native range and maintains close to ancestral population size. there are currently two recognized subspecies, dall's sheep (o. d. dalli) and stone's sheep (o. d. stonei), the validity of which remains uncertain. we investigated the spatial genetic structure of thinhorn sheep populations representing both subspecies by genotyping individuals (n = 919) from across the species ran ...200415315669
geographic distribution of the muscle-dwelling nematode parelaphostrongylus odocoilei in north america, using molecular identification of first-stage larvae.molecular identification of dorsal-spined larvae (dsl) from fecal samples indicates that the protostrongylid parasite parelaphostrongylus odocoilei occupies a broader geographic range in western north america than has been previously reported. we analyzed 2,124 fecal samples at 29 locations from thinhorn sheep (ovis dalli dalli and o. d. stonei), bighorn sheep (ovis canadensis canadensis and o. c. californiana), mountain goats (oreamnos americanus), woodland caribou (rangifer tarandus caribou), ...200516108550
genome-wide set of snps reveals evidence for two glacial refugia and admixture from postglacial recolonization in an alpine ungulate.past glaciation events have played a major role in shaping the genetic diversity and distribution of wild sheep in north america. the advancement of glaciers can isolate populations in ice-free refugia, where they can survive until the recession of ice sheets. the major beringian refugium is thought to have held thinhorn sheep (ovis dalli) populations during times of glacial advance. while isolation in the major refugium can account for much of the genetic and morphological diversity seen in ext ...201627272944
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