2024-03-29T10:05:39Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1783352019-04-02T00:59:00Zcom_10261_108com_10261_8col_10261_361
DIGITAL.CSIC
author
Margalida, Antoni
author
González, Luis Mariano
author
Sánchez, Roberto
author
Oria, Javier
author
Prada, Luis
author
Caldera, Javier
author
Aranda, Antonio
author
Molina, José Ignacio
funder
Ministerio de Medio Ambiente (España)
funder
Comunidad de Madrid
funder
Junta de Comunidades de Castilla-La Mancha
funder
Junta de Castilla y León
funder
Junta de Extremadura
2019-03-22T12:33:31Z
2019-03-22T12:33:31Z
2007
Journal of Ornithology 148(3): 309-322 (2007)
0021-8375
http://hdl.handle.net/10261/178335
10.1007/s10336-007-0133-5
1439-0361
http://dx.doi.org/10.13039/100012818http://dx.doi.org/10.13039/501100011698http://dx.doi.org/10.13039/501100014181http://dx.doi.org/10.13039/501100014180
We present data from a 17-year study of the population biology of a growing population of Spanish imperial eagles Aquila adalberti across most of its breeding range. The objective of this study was to analyse the effects of age, supplemental feeding and rabbit haemorrhagic disease (RHD) on several breeding parameters of this population of eagles. Average clutch size was 2.2 eggs per clutch, and the average incubation time was 41.7 days per clutch. Fledging occurred an average of 76.8 days after hatching, the length of the fledgling period was not correlated to clutch size. The annual average percentage of pairs laying eggs was 88%. A significant reduction in the percentage of pairs laying eggs in the period 1992–1994 (from 91 to 81%) coincided with most of the eagles’ territories being affected by the rabbit epizootic disease, RHD, which reduced their food supply significantly. Average productivity was 1.23 chicks per monitored territory, average breeding success was 1.40 chicks in a clutch per territory and the average fledging rate was 1.69 chicks per territory with hatching success. The main known causes of breeding failure during incubation were nest collapse and human disturbance. During chick-rearing, total or partial chick losses were mainly caused by siblicide, disease, malnutrition or nest collapse. In 26.2% of the 1372 monitored breeding attempts, at least one of the breeding birds was a subadult (the male in 56.1% of the cases, the female in 15.5% and both sexes in 28.4% of cases). In cases of mixed-aged pairs (n = 205), 70.7% were the result of a substitution, and 29.3% were the result of the forming of a new pair. Egg laying took place significantly earlier and breeding success was higher in territories occupied by adults than in those occupied by subadults. Breeding parameters were higher in high-quality (rabbit-rich) territories than in low-quality (rabbit-poor) territories, but only for those territories occupied by adults. The values obtained in the territories occupied by adults were only significantly higher than in those of the subadults in high-quality territories. Age and territory quality thus simultaneously affected reproductive output.
eng
closedAccess
Breeding biology
Breeding experience
Breeding parameters
Habitat quality
Spanish imperial eagle
Supplemental feeding
A long-term large-scale study of the breeding biology of the Spanish imperial eagle (Aquila adalberti)
artículo
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URL
https://digital.csic.es/bitstream/10261/178335/1/accesoRestringido.pdf
File
MD5
b83c8ac165767da5ebe109ca46dab524
60665
application/pdf
accesoRestringido.pdf