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Conflicts between Lesser Kestrel Conservation and European Agricultural Policies as Identif ied by Habitat Use Analyses
European pseudo‐steppes have suffered from extensive changes in agricultural practices during the past decades with the disappearance of field margins and fallow systems and the increase of biocide…
Food resource utilisation by the Magellanic penguin evaluated through stable-isotope analysis: segregation by sex and age and influence on offspring quality
- M. Forero, K. Hobson, G. Bortolotti, J. Donázar, M. Bertellotti, G. Blanco
- Environmental Science
- 3 June 2002
Sex and age differences in diet, as revealed by stable isotopes, may be the consequence of individual morphology (sexual size dimorphism) and re- productive constraints imposed by chick development since growing young require more nutritive prey than adults and yearlings.
Large scale risk-assessment of wind-farms on population viability of a globally endangered long-lived raptor
Density-dependent productivity depression in Pyrenean Bearded Vultures: implications for conservation.
The results suggest that vulture populations are regulated as posited by the site-dependency hypothesis: as the population increases, average productivity decreases because progressively poorer territories are used, and the combined effects of the shrinkage of territories and the presence of floaters around supplementary feeding points seem to be the main causes of productivity decline.
High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach
- M. Forero, G. Bortolotti, K. Hobson, J. Donázar, Marcelo Bertelloti, G. Blanco
- Environmental Science, Biology
- 1 July 2004
Based on stable isotope values of individuals, groups of phylogenetically related species generally showed a high degree of overlap within each group, and coexistence could be interpreted as a consequence of superabundance of food or species diversification in morphology and foraging strategies.
Foraging habitat selection, land-use changes and population decline in the lesser kestrel Falco naumanni
The selection of foraging habitats by nine radio-tagged adult lesser kestrels breeding in one colony in southern Spain, was studied in 1989 and 1990 and there was a general tendency for grassland to be used more, and sunflower and woodlots to beused less, than expected by their availability.
Dietary shifts in two vultures after the demise of supplementary feeding stations: consequences of the EU sanitary legislation
- J. Donázar, A. Cortés-Avizanda, M. Carrete
- Environmental ScienceZeitschrift f\ ur Jagdwissenschaft
- 5 January 2010
The results showed that after the reduction in numbers of supplementary feeding stations (vulture restaurants) the niche breadth of the griffon vulture has broadened and now includes significant amounts of wild rabbits (Oryctolagus cuniculus) and garbage.
Factors affecting breeding dispersal in the facultatively colonial lesser kestrel: individual experience vs. conspecific cues
The causes of breeding dispersal in the lesser kestrel, a species that breeds in colonies of variable size as well as solitarily, support some degree of conspecific attraction.
Sanitary versus environmental policies: fitting together two pieces of the puzzle of European vulture conservation.
Summary 1. Between 1996 and 2000 the appearance of bovine spongiform encephalopathy swiftly became one of the most serious public health and political crises concerning food safety ever experienced…
Conservation status and limiting factors in the endangered population of Egyptian vulture (Neophron percnopterus) in the Canary Islands