Capercaillie (Tetrao urogallus) Science Article 1 abstract In order to estimate minimum area requirements for viable isolated populations of capercaillie Tetrao urogallus in Central Europe, we developed a stochastic population model. Model parameters were largely based on the results of a field study in the Bavarian Alps. Environmental fluctuations (amount of rainfall in June and […]
Category: Galliformes
Social interactions among Capercaillie Tetrao urogallus males outside the lek during spring
Capercaillie (Tetrao urogallus) Science Article 12 abstract Capercaillies have a lek-likemating system,with partly overlappingmale daytime ranges extending radially out fromsmaller display territories at the lek.With VHF telemetry, we studied the spatial interactions among neighbouring adult males (n = 10) of different social status in their overlap zones outside the lek. In addition, we recorded responses […]
Diet of the Cantabrian Capercaillie: geographic variation and energetic content
Capercaillie (Tetrao urogallus) Science Article 7 abstract The diet of the Cantabrian Capercaillie Tetrao urogallus cantabricus was examined by fecal analysis. Droppings were sampled from April 1998 to May 1999 around 23 leks that were grouped in five zones. Winter diet consisted of beech buds, pine needles, buds and catkins of birch and holly leaves. […]
From connectivity to isolation: genetic consequences of population fragmentation in capercaillie across Europe
Capercaillie (Tetrao urogallus) Science Article 3 abstract The capercaillie inhabits a continuous range in large parts of the Palearctic boreal forest, but is patchily distributed in temperate Europe. An ongoing population decline, largely related to human land use changes, has been most pronounced in central and western Europe, where some local populations have become extinct. […]
Do disturbances in surrounding areas affect a core population of Cantabrian Capercaillie Tetrao urogallus cantabricus? The case of the Natural Reserve of Muniellos (Asturias, NW Spain)
Capercaillie (Tetrao urogallus) Science Article 9 abstract Aims: The Cantabrian Capercaillie is an endemic subspecies which is declining over much of its range in the Cantabrian Mountains. The main aim of this paper is to test whether human disturbances in areas surrounding mature woodland patches affect more than habitat structure and composition a core population […]
Kin groups in closely spaced capercaillie leks
Capercaillie (Tetrao urogallus) Science Article 10 abstract We quantified the genetic structure among 58 capercaillie (Tetrao urogallus) from three closely spaced leks in boreal Russia using ten microsatellite loci. We did not find significant structuring with respect to lek membership in an overall analysis. However, all but one individual could be strongly assigned to one […]
Increasing group size dilutes black fly attack rate in Black Grouse
Black Grouse (Tetrao tetrix) Science Article 3 abstract Black flies (Simuliid ) have been observed to harass Black Grouse (Tetrao tetrix) innorthern Finland during summer. We studied experimentally whether group size affectsthe attack rate of black flies on Black Grouse. The increase in flock size diluted the rate ofthe black fly attacks in the Black […]
Inbreeding depression and male . tness in black grouse
Black Grouse (Tetrao tetrix) Science Article 1 abstract The male lifetime lekking performance was studied, and related to inbreeding
Color Signals in the Black Grouse (Tetrao tetrix): SignalProperties and Their Condition Dependency
Black Grouse (Tetrao tetrix) Science Article 7 abstract Recent progress in techniques of quantifying betweenindividualdifferences of color-based ornaments has revealed undiscoveredpossibilities for research in sexual selection. We present howthe color spectra data can be comprehensively used for studying theimportance of sexual ornaments in the black grouse and how theseornaments are related to a male condition. […]
Correlates of male mating success on black grouse (Tetrao tetrix L.)
Black Grouse (Tetrao tetrix) Science Article 2 abstract Sexual selection in black grouse was studied through multivariate analyses of possible correlates of mating success using data from an eight year study of 10 different leks. Body size was weakly correlated with mating status (0 or >= 1 mating) and tail length was significantly correlated with […]