Willow Ptarmigan (Lagopus lagopus) Science Article 6 abstract According to the
Tag: all of Lagopus
Breeding losses of red grouse in Glen Esk (NE Scotland): comparative studies, 30 years on
Willow Ptarmigan (Lagopus lagopus) Science Article 3 abstract Hatching success, brood survival and predation rates of red grouse chicks were examined at four sites in north-east Scotland over two years (1994-1995). Two of these sites have previously been the focus of a large-scale population study on grouse during the late 1950s enabling a comparison to […]
Can parasites synchronise the population fluctuations of sympatric tetraonids? Examining some minimum conditions
Ptarmigan (Lagopus muta) Science Article 9 abstract Sympatric populations of tetraonid birds tend to fluctuate in synchrony, at least onlocal scales. If shared parasites among sympatric populations of different tetraonidspecies are to operate as a local, synchronizing factor for population fluctuations atleast two conditions should be met Per R. Holmstad, Peter J. Hudson, Vigdis Vandvik […]
Leucocytozoon lovati Infections in Wild Rock Ptarmigan(Lagopus mutus) in Japan
Ptarmigan (Lagopus muta) Science Article 5 abstract Leucocytozoon lovati infections were detected in free-flying rock ptarmigan (Lagopus mutus), an endangered species that inhabits alpine areas in Japan. Eight of nine adult birds tested positive for L. lovati infection. For comparison, two captive rock ptarmiganshatched in a breeding facility at the foot of the mountains were […]
Vegetation analysis of the territorial boundary between red grouse (lagopus scoticus) and ptarmigan (Lagopus mutus)
Ptarmigan (Lagopus muta) Science Article 2 abstract The location of the boundary between the territories of red grouse (Lagopus lagopus scoticus) and ptarmigan (Lagopus mutus) is related to the vegetation of the hills where both these species occur. If the he vegetation is dominated by tall, vigorous Calluna vulgaris, grouse occur. At greater altitudes where […]
Geographic variation in body mass of rock ptarmigan Lagopus mutus in the Alps and the Pyrenees
Ptarmigan (Lagopus muta) Science Article 4 abstract We compared the body mass of adult rock ptarmigan Lagopus mutus shot in autumn in the French Pyrenees (Ariege), the French Alps (Hautes-Alpes) and the Italian Alps (Province of Verbania). Mean body mass of adults was greater in the Ariege than in the Hautes-Alpes both for cocks (466 […]
Historical Biogeography and a Mitochondrial DNA Phylogeny of Grouse and Ptarmigan
Ptarmigan (Lagopus muta) Science Article 3 abstract We sequenced 2690 nucleotides of mitochondrial DNA (mtDNA) including the entire control region (CR), partial 12S and 16S ribosomal RNAs, NADH dehydrogenase subunit 2, and cytochrome b genes from representatives of all the 17 living species of grouse and ptarmigan (Aves; Galliformes; subfamily Tetraonin ). Substitution rates and […]
The Reproductive Biology of Rock Ptarmigan (Lagopus mutus) in the Central Canadian Arctic
Ptarmigan (Lagopus muta) Science Article 1 abstract This paper reports on the nesting phenology, breeding biology, and attrition rates at different stages of the breeding cycle of a population of rock ptarmigan (Lagopus mutus) at Windy Lake, Northwest Territories, from 1987 to 1989. By early May, males were on the study area, mostly in flocks […]
Gyrfalcon predation on ptarmigan: numerical andfunctional responses
Ptarmigan (Lagopus muta) Science Article 7 abstract Gyrfalcon predation on ptarmigan during the breeding season was studied innorth-east Iceland 1981
Population fluctuations in Rock Ptarmigan in higharcticGreenland
Ptarmigan (Lagopus muta) Science Article 6 abstract Cyclicity in population fluctuations has been described in a number of tetraonid species. Also, synchronyin these fluctuations