| myoglobin levels and matpase activity in pectoral muscles of spruce and ruffed grouse (aves: tetraoninae). | myoglobin concentration and myosin atpase activity were measured in the pectoral muscle of wild spruce grouse (dendragapus canadensis) and ruffed grouse (bonasa umbellus), together with the weight of the mm. pectoralis, supracoracoideus and heart. matpase activities were similar in both species, but spruce grouse contained 15 times more myoglobin in the pectoralis muscle and the heart was three times heavier than that of the ruffed grouse. the relative mass of the flight muscles and wing loading ... | 1985 | 2859952 |
| adaptive significance of the caeca in japanese quail and spruce grouse (galliformes). | | 1974 | 4442003 |
| hematozoa from the alaskan spruce grouse, canachites canadensis. | | 1967 | 4960571 |
| secondary effects of the pesticide bacillus thuringiensis kurstaki on chicks of spruce grouse (dendragapus canadensis). | the objective of this study was to determine if application of the biological pesticide bacillus thuringiensis kurstaki (b.t.k.) had secondary effects on spruce grouse (dendragapus canadensis) chicks in the southern boreal forest of ontario, canada. b.t.k. kills larvae of lepidoptera that might otherwise be food. this may affect types of food ingested and influence chick growth rates by reducing the availability of a high-protein food. amount of ingested grit, which is diet-dependent, may also b ... | 2001 | 11503075 |
| phylogeny of tetraoninae and other galliform birds using mitochondrial 12s and nd2 genes. | the avian subfamily tetraoninae (grouse and ptarmigan) is a holarctic group in the order galliformes distinguished by morphological adaptations to cold environments and behavioral traits associated with elaborate courtship. here we investigate the relationships of 17 tetraonines and 12 other galliform species using mitochondrial 12s and nd2 sequence data. we found support for the recent phylogenetic classification that separates the genus dendragapus into two genera, falcipennis and dendragapus. ... | 2002 | 12144757 |
| molecular phylogeny of grouse: individual and combined performance of w-linked, autosomal, and mitochondrial loci. | the phylogeny of grouse (aves: tetraoninae) was reconstructed using four noncoding loci: two were w-linked, one was autosomal, and one was the mitochondrial control region (cr). the rapidly evolving cr provided resolution throughout the tree, whereas the slowly evolving nuclear loci failed to resolve deeper nodes. the tree based on all four loci combined was almost identical to the cr tree and did not improve resolution or bootstrap support. the stemminess and imbalance of the trees were good de ... | 2002 | 12554459 |
| grit ingestion as a source of metal exposure in the spruce grouse, dendragapus canadensis. | the objective of this study was to determine if ingestion of grit was a source of metal exposure to the spruce grouse, dendragapus canadensis. a secondary objective was to assess whether grit could provide a supplemental source of essential minerals to their diet. ca, p, mg, s, zn, cu, ni, co, cr, fe, mn, al, pb and cd of liver (adult, yearling, chicks), crop and gizzard contents (adults) were determined for grouse collected from a relatively pristine boreal forest region of north-central ontari ... | 1999 | 15093036 |
| lead concentrations in ruffed grouse, rock ptarmigan, and willow ptarmigan in québec. | between 1996 and 1998, ruffed grouse, spruce grouse, willow ptarmigan, and rock ptarmigan harvested by hunters in québec were examined for lead contamination. on examination of the gizzards of these birds, lead shot was found only in ruffed grouse (1.2%). the probability of ingestion of lead shot by grouse and ptarmigans is low. analyses of the lead concentrations in the wing bones of grouse and ptarmigans and in the muscle tissue of ptarmigans were conducted. although differences were observed ... | 2005 | 15959706 |
| arsenic speciation in terrestrial birds from yellowknife, northwest territories, canada: the unexpected finding of arsenobetaine. | the surrounding area of yellowknife, northwest territories, canada, is known for naturally and anthropogenically elevated concentrations of arsenic. five bird species (gray jay [perisoreus canadensis], american tree sparrow [spizella arborea], dark-eyed junco [junco hyemalis], yellow-rumped warbler [dendroica coronata], and spruce grouse [dendragapus canadensis]) were collected from this area. their tissues were analyzed for total arsenic and for arsenic species, allowing us to report, to our kn ... | 2005 | 16117124 |
| aromatase expression in the brain of the ruffed grouse (bonasa umbellus) and comparisons with other galliform birds (aves, galliformes). | the enzyme aromatase is important for regulating sexual and aggressive behaviors during the reproductive season, including many aspects of courtship. in birds, aromatase is expressed at high levels in a number of different brain regions. although this expression does vary among species, the extent to which the distribution of aromatase positive cells reflects species differences in courtship and other behaviors is not well established. here, we examine the distribution of aromatase immunoreactiv ... | 2012 | 23266340 |
| continental divide: predicting climate-mediated fragmentation and biodiversity loss in the boreal forest. | climate change threatens natural landscapes through shifting distribution and abundance of species and attendant change in the structure and function of ecosystems. however, it remains unclear how climate-mediated variation in species' environmental niche space may lead to large-scale fragmentation of species distributions, altered meta-population dynamics and gene flow, and disrupted ecosystem integrity. such change may be especially relevant when species distributions are restricted either spa ... | 2017 | 28505173 |
| spruce grouse, a non-gregarious and sparsely distributed forest bird, shows synchronous nesting. | hatch dates, densities, age-structure, and production rates were documented for female spruce grouse (dendragapus canadensis) in alberta, ontario, and new brunswick, canada, over a total of 17 years during 1970-1990. objectives of analyses were to measure the magnitude of synchrony of hatch dates at different densities of females in different areas, determine whether synchrony differs between adults and yearlings, determine whether adults might influence the time and synchrony with which yearlin ... | 2000 | 28308757 |
| consequences of insular population structure: distribution and extinction of spruce grouse populations. | the population structure of the spruce grouse (canachites canadensis) was studied in the adirondack mountains of new york, u.s.a. twenty-five isolated habitat patches exist and are occupied by spruce grouse, with 7 suitable but unoccupied patches existing at the periphery of the range. the regional distribution and abundance of spruce grouse is correlated with the amount of lowland coniferous forest habitat. unoccupied patches were significantly smaller and significantly farther from occupied pa ... | 1979 | 28309697 |