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
new host and geographic records for two protostrongylids in dall's sheep.biodiversity survey and inventory have resulted in new information on the distribution of protostrongylidae in dall's sheep (ovis dalli dalli) from the northwest territories (nt, canada) and from alaska (ak, usa). in 1998, parelaphostrongylus odocoilei adults were found for the first time in the skeletal muscles of dall's sheep in the mackenzie mountains (nt). adult p. odocoilei were associated with petechial and ecchymotic hemorrhages and localized myositis; eggs and larvae in the lungs were as ...200111763740
muskox lungworm (umingmakstrongylus pallikuukensis) does not establish in experimentally exposed thinhorn sheep (ovis dalli).muskoxen (ovibos moschlatus moschatus) on the northwestern mainland of nunavut and northwest territories, canada, are infected with the protostrongylid lungworm, umingmaksrongylus pallikuuhkensis. the geographic range of this muskox population is expanding to the south and west, and it is anticipated that these animals will eventually become sympatric with dall's sheep (ovis dalli dalli) in the mackenzie and richardson mountains. to address the concern of wildlife managers that u. pallikulkensis ...200415362818
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
climate change and the epidemiology of protostrongylid nematodes in northern ecosystems: parelaphostrongylus odocoilei and protostrongylus stilesi in dall's sheep ( ovis d. dalli ).we describe the epidemiology of the protostrongylid parasites parelaphostrongylus odocoilei and protostrongylus stilesi in dall's sheep (ovis dalli dalli) from the mackenzie mountains, northwest territories, canada (65 degrees n; 128 degrees w). peak numbers of 1st-stage larvae of both parasites were shed by dall's sheep on their winter range from march until may. in larval development experiments in the mackenzie mountains, peak numbers of infective 3rd-stage larvae of p. odocoilei were availab ...200616332289
caudal polymorphism and cephalic morphology among first-stage larvae of parelaphostrongylus odocoilei (protostrongylidae: elaphostrongylinae) in dall's sheep from the mackenzie mountains, canada.we demonstrate polymorphism in the structure of the tail among first-stage larvae of parelaphostrongylus odocoilei (protostrongylidae). two distinct larvae, both with a characteristic dorsal spine, include (1) a morphotype with a kinked conical tail marked by 3 distinct transverse folds or joints and a symmetrical terminal tail spike and (2) a morphotype with a digitate terminal region lacking folds or joints and with an asymmetrical, subterminal tail spike. these divergent larval forms had been ...200516539011
protostrongylid parasites and pneumonia in captive and wild thinhorn sheep (ovis dalli).we describe health significance of protostrongylid parasites (parelaphostrongylus odocoilei and protostrongylus stilesi) and other respiratory pathogens in more than 50 naturally infected dall's sheep (ovis dalli dalli) from the mackenzie mountains, northwest territories (1998-2002) as well as in three stone's sheep (o. d. stonei) experimentally infected with p. odocoilei (2000-2002). histological lesions in the brain and distribution of p. odocoilei in the muscles of experimentally and naturall ...200717495303
structure, biodiversity, and historical biogeography of nematode faunas in holarctic ruminants: morphological and molecular diagnoses for teladorsagia boreoarcticus n. sp. (nematoda: ostertagiinae), a dimorphic cryptic species in muskoxen (ovibos moschatus).discovery of the ostertagiine nematode teladorsagia boreoarcticus n. sp. in muskoxen, ovibos moschatus, from the central canadian arctic highlights the paucity of knowledge about the genealogical and numerical diversity of nematode faunas characteristic of artiodactyls at high latitudes across the holarctic. teladorsagia boreoarcticus is a dimorphic cryptic species distinguished from teladorsagia circumcincta/teladorsagia trifurcata in domestic sheep by a 13% divergence in the nd4 region of mito ...199910577730
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