| comparative morphometric study of the vestibular system of the vertebrata: reptilia, aves, amphibia, and pisces. | morphometric measurements were made from serial sections of the vestibular system in four classes of vertebrates: reptilia, aves, amphibia, and pisces. representative species of reptile studied were the lizard (gekko gecko), the common garter snake (thamnophis sp.), and the common turtle (chelonia sp.). the budgie (melopsittacus undulatas), the common pigeon (columba domestica), the yellow-bellied sapsucker (sphyrapicus varius), and the horned owl (bubo virginianus) were chosen as representative ... | 1986 | 3485883 |
| strong reproductive isolation and narrow genomic tracts of differentiation among three woodpecker species in secondary contact. | hybrid zones allow the measurement of gene flow across the genome, producing insight into the genomic architecture of speciation. such analysis is particularly powerful when applied to multiple pairs of hybridizing species, as patterns of genomic differentiation can then be related to age of the hybridizing species, providing a view into the build-up of differentiation over time. we examined 33 809 single nucleotide polymorphisms (snps) in three hybridizing woodpecker species: red-breasted, red- ... | 2016 | 27392517 |
| early breeders choose differently - refining measures of habitat quality for the yellow-bellied sapsucker (sphyrapicus varius), a keystone species in the mixedwood boreal forest. | despite the prevalent use of nest-site selection studies to define habitat quality for birds, many studies relying on use-availability analysis have found poor correlations between selected vegetation and reproductive success. using 3 years of data from northeastern british columbia (2007-2009), we determined timing of breeding from hatching dates and contrasted the nest-site selection of earlier (n = 22) with later-nesting pairs (n = 36) of yellow-bellied sapsuckers (sphyrapicus varius), becaus ... | 2018 | 30208081 |
| population genetics and speciation of yellow-bellied, red-naped, and red-breasted sapsuckers (sphyrapicus varius, s. nuchalis, and s. ruber). | the root of understanding speciation lies in determining the forces which drive it. in many closely-related species, including sphyrapicus varius, s. nuchalis, and s. ruber, it is assumed that speciation occurred due to isolation in multiple pleistocene refugia. we used genetic data from 457 samples at the control region (cr), cytochrome oxidase i (coi), and chromo-helicase dna binding protein (chd1z) to examine range-wide population genetic structure and differentiation amongst these 3 species ... | 2018 | 30010809 |