| host associations of the tick, ixodes angustus (acari: ixodidae), on alaskan mammals. | infestation parameters are presented for 227 ticks, all ixodes angustus neumann, collected from individual mammals (n = 531) in southeastern and south-central alaska from 1996 to 1999. this tick was recovered from 12 of the 19 mammal species examined, with four species of shrews (sorex spp.), two species of voles [clethrionomys gapperi (vigors) and clethrionomys rutilus (pallas)], one species of mouse [peromyscus keeni (rhoads)], and the red squirrel [tamiasciurus hudsonicus (erxleben)] being th ... | 2003 | 14596283 |
| annual and seasonal changes in diets of martens: evidence from stable isotope analysis. | theory predicts that generalist predators will switch to alternative prey when preferred foods are not readily available. studies on the feeding ecology of the american marten (martes americana) throughout north america suggest that this mustelid is a generalist predator feeding largely on voles (microtus sp.; clethrionomys sp.). we investigated seasonal and annual changes in diets of martens in response to the changing abundance of small rodents (peromyscus keeni, and microtus longicaudus) on c ... | 1997 | 28308005 |
| functional and numerical responses of shrews to competition vary with mouse density. | for decades, ecologists have debated the importance of biotic interactions (e.g., competition) and abiotic factors in regulating populations. competition can influence patterns of distribution, abundance, and resource use in many systems but remains difficult to measure. we quantified competition between two sympatric small mammals, keen's mice (peromyscus keeni) and dusky shrews (sorex monticolus), in four habitat types on prince of wales island in southeast alaska. we related shrew density to ... | 2018 | 29298313 |
| historical demography and genetic structure of sister species: deermice (peromyscus) in the north american temperate rain forest. | to investigate the evolutionary and biogeographical history of peromyscus keeni and p. maniculatus within the coastal forest ecosystem of the pacific northwest of north america, we sampled 128 individuals from 43 localities from southeastern alaska through oregon. we analysed mitochondrial dna variation using dna sequence data from the mitochondrial cytochrome-b (cyt-b) gene and control region, and we found two distinct clades consistent with the morphological designation of the two species. the ... | 2003 | 12675826 |
| living on the edge: exploring the role of coastal refugia in the alexander archipelago of alaska. | although islands are of long-standing interest to biologists, only a handful of studies have investigated the role of climatic history in shaping evolutionary diversification in high-latitude archipelagos. in this study of the alexander archipelago (aa) of southeast alaska, we address the impact of glacial cycles on geographic genetic structure for three mammals co-distributed along the north pacific coast. we examined variation in mitochondrial and nuclear loci for long-tailed voles (microtus l ... | 2019 | 30847072 |