Long-term monitoring of endangered birds is essential to estimate population trends and to identify potential causes of population decline. This is particularly important for alpine birds inhabiting mountain areas at the boundaries of their range. Here we analyse the population trend of Capercaillie in the Spanish Central Pyrenees based on annual surveys carried out between 2000 and 2017. We found a significant population decline (around 58%) in the number of birds counted in leks. Most capercaillies inhabit coniferous forests of Black Pine with abundant Bilberry and Rhododendron understorey. The number of males declined at lower altitudes and in more exposed orientations, in a scenario consistent with the differential rate of loss of habitat quality due to climate change. We hypothesised that one of the main causes of the Capercaillie decline could be low breeding success (average annual productivity 0.67 chicks per female). In light of the decline rates observed, the Pyrenean population should be relisted as endangered in the Spanish National Catalogue of Endangered Species. Affording a higher degree of protection should guarantee the adoption of management measures to reverse or slow down the general trend of decline of the species in the south of its range.—Gil, J.A., Gómez-Serrano, M.Á. & López-López, P. (2020). Population decline of the Capercaillie Tetrao urogallus aquitanicus in the Central Pyrenees. Ardeola, 67: 285-306.
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9 April 2020
Population Decline of the Capercaillie Tetrao urogallus aquitanicus in the Central Pyrenees
Juan Antonio Gil,
Miguel Ángel Gómez-Serrano,
Pascual López-López
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Ardeola
Vol. 67 • No. 2
July 2020
Vol. 67 • No. 2
July 2020
alpine birds
aves alpinas
breeding success
conservación
conservation
éxito reproductor
grouse