Variation in age-structured vital rates of a long-lived raptor: Implications for population growth

Sergio, Fabrizio; Tavecchia, Giacomo; Blas, Julio; López, Lidia M.; Tanferna, Alessandro; Hiraldo, Fernando

doi:10.1016/j.baae.2010.11.004

Cited by 72 publications

(72 citation statements)

References 45 publications

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“…Thus, although the percentage of pairs that do not start laying annually is important (range 29.4À58.1%), the decision to start breeding, which could be influenced by the physical condition of the individual (Jenouvrier et al 2005), appears not to compromise the reproduction of Bearded Vultures. This suggests that, in this isolated population, several buffering mechanisms (e.g., changes in the structure of breeding age, low dispersal movements) may contribute to maintain stability in the percentage of pairs that start laying (Sergio et al 2011, Margalida et al 2013. In this sense, the carcass disposal policy does not seem to affect population movements because pre-adult individuals remained in the study area without greater pre-dispersal movements (Margalida et al 2013).…”

Section: Discussionmentioning

confidence: 93%

Man‐induced activities modify demographic parameters in a long‐lived species: effects of poisoning and health policies

Margalida

Colomer

Oro

2014

Ecological Applications

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Abstract. Recent changes in sanitary policies within the European Union (EU) concerning disposal of carcasses of domestic animals and the increase of non-natural mortality factors, such as illegal poisoning, are threatening European vultures. However, the effects of anthropogenic activities on demographic parameters are poorly studied. Using a long-term study (1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011) of the threatened Pyrenean Bearded Vulture Gypaetus barbatus population, we assess the variation in the proportion of breeding pairs, egg-laying dates, clutch size, breeding success, and survival following a sharp reduction in food availability in 2005 due to the application of restrictive sanitary policies decreasing livestock carcass availability. We found a delay in laying dates and a regressive trend in clutch size, breeding success, and survival following policy change. The maintenance of specific supplementary feeding stations for Bearded Vultures probably reduced the negative effects of illegal poisoning and food shortages, which mainly affected subadult survival. A drop in food availability may have produced changes in demographic parameters and an increase in mortality due to an increased exposure to contaminated food. As a result, supplementary feeding as a precautionary measure can be a useful tool to reduce illegal poisoning and declines in demographic parameters until previous food availability scenarios are achieved. This study shows how anthropogenic activities through human health regulations that affect habitat quality can suddenly modify demographic parameters in long-lived species, including those, such as survival, with high sensitivity to population growth rate.

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Section: Discussionmentioning

confidence: 93%

Man‐induced activities modify demographic parameters in a long‐lived species: effects of poisoning and health policies

Margalida

Colomer

Oro

2014

Ecological Applications

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“…Thus, we highlight here the relevance of monitoring early-life phases for understanding their sensitivity to environmental conditions and the potential consequences for population dynamics. Although life-history theory predicts that adult survival will be the key parameter driving population functioning, juvenile survival has recently been acknowledged as an important source of variability in population dynamics [17,37,49].…”

Section: Discussionmentioning

confidence: 99%

“…Our results suggest that a strong selection filter operates on this species at least during the first year of life, eliminating those frail individuals, and the strength of mortality during this period depends on the severity of environmental conditions during early life. Therefore, rearing and first winter periods seem to be operating as two consecutive cohort effects, probably resulting in a positive selection for high-quality phenotypes [17].…”

Section: Discussionmentioning

confidence: 99%

“…Within survival studies, substantial research describes the effects of early-life conditions under controlled experimental conditions [3,16] but much less is known about wild populations of long-lived species [3,13,16]. Additionally, it is likely that the processes underlying the strong earlylife selection pressures on survival, which lead to high and stable adult survival rates in long-lived species, are not limited to the rearing period [17]. For example, conditions experienced during winter may give rise to important changes in demographic rates such as recruitment, dispersal and even survival [18].…”

Section: Introductionmentioning

confidence: 99%

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Consecutive cohort effects driven by density-dependence and climate influence early-life survival in a long-lived bird

Payo‐Payo

Genovart

Bertolero³

et al. 2016

Proc. R. Soc. B.

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Conditions during early life, including maternal cohort effects, can influence the future fitness of individuals. This may be particularly true for longdistance migrating birds, because, apart from conditions experienced by cohorts during rearing, conditions during early life in regions far from breeding grounds may also influence their population dynamics. Very little is known about the fitness consequences of those conditions experienced by juveniles after independence, especially in wild populations and for longlived birds. We used multi-event capture-recapture-recovery models and a unique 26-year dataset for the Audouin's gull (Larus audouinii) to assess for the first time whether survival was influenced by early conditions, both during the rearing period (i.e. a maternal cohort effect potentially affected by density dependence) and the first winter (i.e. a cohort effect driven by climate when birds disperse to wintering grounds). Our results show that juvenile survival was highly sensitive to early-life conditions and that survival decreased with stronger density dependence and harsh climate. The two consecutive cohort effects were of similar magnitude and they may represent a selection filter. Thus, early-life conditions had a strong impact on survival, and neglecting this complexity may hinder our understanding on how populations of long-lived animals fluctuate and respond to perturbations.

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“…Исследования демографии долгоживущих птиц показали, что у этих видов смертность особенно высока в начальный период жизни (см., напр., [5]). Затем смертность уменьшается, но после достижения взрослого состояния вновь начинает постепенно увеличиваться, что связано уже со старением птиц [6].…”

Section: уточнение оценки выживаемости взрослых особей с помощью модеunclassified

Matrix Model of the Steller’s Sea Eagle Population: Improvements and New Data

Romanov¹

2014

Math.Biol.Bioinf.

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Variation in age-structured vital rates of a long-lived raptor: Implications for population growth

Cited by 72 publications

References 45 publications

Man‐induced activities modify demographic parameters in a long‐lived species: effects of poisoning and health policies

Man‐induced activities modify demographic parameters in a long‐lived species: effects of poisoning and health policies

Consecutive cohort effects driven by density-dependence and climate influence early-life survival in a long-lived bird

Matrix Model of the Steller’s Sea Eagle Population: Improvements and New Data

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