Influence of environmental factors on the breeding success of Cinereous Vultures Aegypius monachus

• Autorzy: Moreno-Opo R. , Fernandez-Olalla M. , Margalida A. , Arredondo A. , Guil F.

Warianty tytułu

PL

Czynniki wpływające na sukces lęgowy sępa kasztanowatego

• Języki publikacji: EN

Abstrakty

EN

Breeding success determines the fate of bird populations and, therefore, understanding its determinants is an important issue for the application of conservation measures for endangered species. Breeding success depends on diverse, not mutually exclusive, effects such as the life strategies developed by species, environmental, ecological and anthropogenic factors. The influence of nest and nest tree characteristics, landscape composition and human disturbance on the breeding success of the vulnerable Cinereous Vulture Aegypius monachus in breeding colony in central Spain was analysed. A number of variables characterising the vegetation around the nest-tree, the nest-tree, and the nest itself were selected and analysed. We found that bigger and less deteriorated nests, taller nesting trees and a higher shrub coverage in a radius of 100 m around the nest resulted in an increased breeding success. Although nesting sites characteristics and nest quality can be related to birds' age and breeding experience, our findings show that geographical orientation of the slope where the nest is located as well as nest accessibility and habitat selection have an influence on Cinereous Vulture breeding success. We recommend that mature forests, steeper slopes should be carefully conserved and protected from anthropogenic disturbances in order to strengthen the conservation of breeding areas of this forest-dwelling endangered raptor species.

PL

U ptaków żywotność populacji jest determinowana m.in przez sukces lęgowy, dlatego określenie czynników, które mogą mieć na niego wpływ jest ważne z punktu widzenia ochrony zagrożonych gatunków. W pracy określano związek pomiędzy sukcesem lęgowym sępa kasztanowatego i 20 czynnikami, które przyporządkowano do jednej z pięciu kategorii: charakterystyki gniazda, charakterystyki drzewa, na którym umiejscowione było gniazdo, charakterystyki roślinności w najbliższym otoczeniu gniazda, czynników krajobrazowych i czynników związanych z antropopresją (Tab. 1). Badania prowadzono w liczącej 104 pary kolonii zlokalizowanej w centralnej Hiszpanii. Stwierdzono, że na sukces lęgowy największy wpływ mają czynniki związane z charakterystyką gniazda, charakterystyką drzewa, na którym umiejscowione jest gniazdo oraz charakterystyką roślinności w najbliższym otoczeniu gniazda (Tab. 2). Szansa wyprowadzenia młodych w badanej kolonii wzrastała wraz ze zwiększeniem średnicy platformy gniazdowej, wzrostem wysokości drzewa, na którym umiejscowione było gniazdo, wzrostem liczby drzew wyższych niż 4 m w promieniu 25 m od gniazda, wzrostem wysokości krzewów, wyższym pokryciem terenu przez krzewy i niższym przez drzewa w promieniu 100 m od gniazda (Tab. 3, Fig. 1). Autorzy wskazują, że w celu zwiększenia liczebności sępa kasztanowatego należy chronić dojrzałe lasy z wysokimi drzewami porastające strome zbocza. Powinny one być oddzielone strefą buforową od terenów poddanych gospodarce leśnej.

• Wydawca: -
• Czasopismo: Acta Ornithologica
• Rocznik: 2013
• Tom: 48
• Numer: 2
• Opis fizyczny: p.187-193,fig.,ref.

Twórcy

autor

Moreno-Opo R.

• CBD-Habitat Foundation, Gustavo Fernandez Balbuena, 2. E-28002, Madrid, Spain
• Vertebrate Biology and Conservation Group, University Complutense of Madrid, E-28040, Madrid, Spain

autor

Fernandez-Olalla M.

• Higher Technical School of Forestry Engineering, University Politecnica of Madrid, E-28024, Madrid, Spain

autor

Margalida A.

• Division of Conservation Biology, Institute of Ecology and Evolution, University of Bern, Baltzerstrasse 6. CH-3012, Bern, Switzerland
• Department of Animal Production (Division of Wildlife), Faculty of Life Sciences and Engineering, University of Lleida, E-25198, Lleida, Spain

autor

Arredondo A.

• CBD-Habitat Foundation, Gustavo Fernandez Balbuena, 2. E-28002, Madrid, Spain

autor

Guil F.

• CBD-Habitat Foundation, Gustavo Fernandez Balbuena, 2. E-28002, Madrid, Spain

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