Philopatry, natal dispersal, first settlement and age of first breeding of bearded vultures<i>Gypaetus barbatus</i>in central Pyrenees

López‐López, Pascual; Zuberogoitia, Íñigo; Alcántara, Manuel; Gil, Juan Antonio

doi:10.1080/00063657.2013.842537

Cited by 24 publications

(16 citation statements)

References 17 publications

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“…The bearded vulture is another large (4,500–7,000 g) long‐lived territorial raptor, with a maximum recorded life span of 32 years (Ferrer et al., ; López‐López, Zuberogoitia, Alcántara, & Gil, and references therein), and delayed maturity (adult plumage at 5–7 years old), that breeds in sparsely distributed territories in mountainous regions (Donazar, Hiraldo, & Bustamante, ). Annual productivity in Spain averages 0.65 young per pair (range 0–1).…”

Section: Methodsmentioning

confidence: 99%

Reintroducing endangered raptors: A case study of supplementary feeding and removal of nestlings from wild populations

Ferrer

Morandini

Báguena³

et al. 2017

Journal of Applied Ecology

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The NERC and CEH trademarks and logos ('the Trademarks') are registered trademarks of NERC in the UK and other countries, and may not be used without the prior written consent of the Trademark owner. Accepted ArticleThis article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Accepted ArticleThis article is protected by copyright. All rights reserved. 3. Results of Generalised linear mixed model (GLMM) analysis with relative productivity as the dependent variable, species and supplementary feeding as fixed factors and territory as random factor, showed a significant effect of supplementary feeding on relative productivity in both species as well as in the interaction between territory and supplementary feeding. This implied a different response among territories to supplementary feeding. Birds in poor quality territories with low productivity levels responded more strongly to supplementary feeding than birds in territories with higher levels of natural productivity.4. A reintroduction programme based on supplementary feeding and extraction of nestlings costs eight times less than the same program based on captive breeding, and takes ten years less.5. Synthesis and applications. Supplementary feeding in territorial raptors could be useful in two situations: (i) in an episodic main prey collapse and (ii) in poor quality territories in a high density population, to produce extra young for reintroduction programmes. For greatest efficiency, supplementary feeding needs to be targeted at the poorer territories in which the reproductive rate has the potential to be raised by provision of extra food. The extra young produced can then be used in reintroduction programmes in which their chances of recruiting to a breeding population are high.

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Section: Methodsmentioning

confidence: 99%

Reintroducing endangered raptors: A case study of supplementary feeding and removal of nestlings from wild populations

Ferrer

Morandini

Báguena³

et al. 2017

Journal of Applied Ecology

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“…We concentrate on immature and juvenile birds because young and naïve birds are also generally engaged in erratic movements, potentially leading them to dangerous areas (López-López et al 2013; Phipps et al 2013). …”

Section: Case Study: Himalayan Vulturesmentioning

confidence: 99%

Bio-logging, new technologies to study conservation physiology on the move: a case study on annual survival of Himalayan vultures

et al. 2017

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Bio-logging, the on-animal deployment of miniaturised electronic data recorders, allows for the study of location, body position, and physiology of individuals throughout their ontogeny. For terrestrial animals, 1 Hz GPS-position, 3D-body acceleration, and ambient temperature provide standard data to link to the physiology of life histories. Environmental context is added at ever finer scales using remote sensing earth observation data. Here we showcase the use of such bio-logging approaches in a conservation physiology study on endangered Himalayan vultures (Gyps himalayensis). We determine environmental, behavioural, and physiological causes of survival in immature birds that roam from wintering sites in India, Bhutan, and Nepal towards summer areas in Tibet and Mongolia. Five of 18 immature griffons died during one year. Individuals that died had failed to migrate sufficiently far northward (>1500 km) in spring. Individuals likely died if they flew against headwinds from the north or were less able to find thermal updrafts. Surviving individuals migrated to cold and dry areas with low population density. We highlight flight experience, long distance movements, and remote places with low human population as factors critical for the survival of Himalayan vultures. High-resolution bio-logging studies can advance conservation management by pinpointing where and why migratory animals have problems and die.

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“…According to López-López, Zuberogoitia, Alcántara, and Gil (2013), recorded age of first successful breeding in Bearded Vultures varies between 6 and 16 years, with a median of 9 years. Depending on the density of the population, and consequently on the availability of territorial vacancies, this age could be higher or lower.…”

Section: Reintroduced Population Stable Populationsmentioning

confidence: 99%

The role of age of first breeding in modeling raptor reintroductions

Morandini

Dietz

Newton

et al. 2019

Ecology and Evolution

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The present biodiversity crisis has led to an increasing number of reintroduction programs, and this conservation method is likely to be increasingly used in the future, especially in the face of climate change. Many fundamental questions in population ecology are focused on the mechanisms through which populations escape extinction. Population viability analysis (PVA) is the most common procedure for analyzing extinction risk. In the use of PVA to model the trajectories of reintroduced populations, demographic values are sometimes taken from other existing wild populations or even from individuals in captivity. Density dependence in productivity is usually considered in viability models, but density‐dependent variation in age of first breeding is usually ignored. Nevertheless, age of first breeding has a buffering effect on population fluctuations and in consequence on population persistence. We simulated the viability of Spanish Imperial Eagle ( Aquila adalberti ) and Osprey ( Pandion haliaetus ) populations using data from established and reintroduced populations in southern Spain. Our results show that reduction in the age of first breeding is critical in the success of reintroductions of such long‐lived birds. Additionally, increases in productivity allow populations to growth at maximum rate. However, without considering variation in age of breeding, and the associated increasing overall productivity, reintroduced populations seem nonviable. To ignore density dependence in age of breeding in PVA means that we are seriously limiting the potential of the model population to respond to fluctuations in density, thereby reducing its resilience and viability. Variation in age of first breeding is an important factor that must be considered and included in any simulation model involving long‐lived birds with deferred maturity.

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Philopatry, natal dispersal, first settlement and age of first breeding of bearded vulturesGypaetus barbatusin central Pyrenees

Cited by 24 publications

References 17 publications

Reintroducing endangered raptors: A case study of supplementary feeding and removal of nestlings from wild populations

Reintroducing endangered raptors: A case study of supplementary feeding and removal of nestlings from wild populations

Bio-logging, new technologies to study conservation physiology on the move: a case study on annual survival of Himalayan vultures

The role of age of first breeding in modeling raptor reintroductions

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