Publications

regulation and grinding ability of grit in the gizzard of norwegian willow ptarmigan (lagopus lagopus).	fluctuations in grit composition in the gizzards of willow ptarmigans and the grinding ability of various grit assortments from wild ptarmigans were examined. we confirmed reports of other investigators that larger, fewer and rounder stones were present in the winter than in the autumn. experiments showed that ptarmigans prefer stones with diameters between 2-5 mm. birds on a constant diet maintained a constant stone intake throughout the year. the composition of gizzard grit was influenced by t ...	1975	1228713
standard sampling techniques underestimate prevalence of avian hematozoa in willow ptarmigan (lagopus lagopus).	a total of 68 willow ptarmigan (lagopus lagopus l.) was collected during september 1995 from two localities in troms county, northern norway. thin blood smears were prepared and examined for blood parasites. of the 68 willow ptarmigan examined, 94% harbored one or more species of hematozoa. there were four (6%), 44 (65%), 16 (24%), and four (6%) birds infected by zero, one, two, and three species of parasites, respectively. prevalences at the coastal locality, kattfjord (n = 43), were leucocytoz ...	2003	12910763
accumulation of heavy metals in circumpolar willow ptarmigan (lagopus l. lagopus) populations.	a circumpolar survey of heavy metals in willow ptarmigan liver and kidney revealed considerable variations in cd content in canada and scandinavia. the cd content in central canada was comparable with that in scandinavia and russia, at least for kidney. however, in both liver and kidney the median for canada as a whole was much higher than in the other countries. some canadian locations had exceptionally high levels, several birds having >50 mg kg(-1) in liver and >400 mg kg(-1) in kidney. in no ...	2006	17055034
the importance of willow thickets for ptarmigan and hares in shrub tundra: the more the better?	in patchy habitats, the relationship between animal abundance and cover of a preferred habitat may change with the availability of that habitat, resulting in a functional response in habitat use. here, we investigate the relationship of two specialized herbivores, willow ptarmigan (lagopus lagopus) and mountain hare (lepus timidus), to willows (salix spp.) in three regions of the shrub tundra zone-northern norway, northern european russia and western siberia. shrub tundra is a naturally patchy h ...	2011	21833646