The return of the white-tailed eagle (Haliaeetus albicilla) to northern Germany: Modelling the past to predict the future

Krüger, Oliver; Grünkorn, Thomas; Struwe-Juhl, B.

doi:10.1016/j.biocon.2009.12.010

Cited by 42 publications

(57 citation statements)

References 61 publications

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“…), the Griffon Vulture Gyps fulvus in central France (Sarrazin & Legendre ), the White‐tailed Eagle Haliaeetus albicilla in northern Germany (Krüger et al . ), the Bearded Vulture Gypaetus barbatus in northern Spain (Oro et al . ) and the Red Kite Milvus milvus in the UK (Smart et al .…”

Section: Discussionmentioning

confidence: 99%

“…Using retrospective analyses, Krüger et al . () showed that the increase in natural White‐tailed Eagle populations was mainly explained by pre‐breeding survival (55%) and that reproductive output only explained 13.5% of the variation in population growth. Evidence for density‐dependence on productivity and proportion of breeders was found in the Golden Eagle (Fasce et al .…”

Section: Discussionmentioning

confidence: 99%

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The demography of a newly establishedOspreyPandion haliaetuspopulation inFrance

Wahl

Barbraud

2013

Ibis

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Using long‐term mark–resighting data acquired over 27 years in continental France, we estimated demographic parameters and modelled the dynamics of a newly established population of Ospreys Pandion haliaetus using a life‐history model. We then performed prospective and retrospective analyses to estimate the sensitivity of the population growth rate to demographic parameters, and to quantify their contribution to the observed variation in abundance. The observed population growth rate was estimated at 1.150 (from one to 38 pairs in the period 1985–2011), and the stochastic population growth rate was estimated at 1.156. The number of fledglings per nest made the largest contribution to the variance of the observed population growth rate. Breeding productivity was stable across years. In contrast, the prospective analysis indicated that the sensitivity of the population growth rate was greatest for immigration and adult survival. Our results suggest that the increase of a new and recently established breeding population of Ospreys was mainly driven by local dynamics (high productivity and high proportion of breeding individuals), with no sign of density‐dependence except for juvenile survival. This probably reflects highly favourable conditions for breeding. Our results show that productivity can be a major driver in recovering raptor populations, and conservation work should aim to protect occupied nest‐sites and their surrounding habitat and to maintain highly favourable foraging areas in the vicinity of breeding sites.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

The demography of a newly establishedOspreyPandion haliaetuspopulation inFrance

Wahl

Barbraud

2013

Ibis

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“…Our findings that survival of peregrines of all ages was somewhat lower during the earlier study period may indicate possible chronic effects of organochlorine pesticides, even though their use had been substantially reduced by that time. Because population growth rate of long-lived birds such as peregrines is proportionately more sensitive to changes in survival than reproductive rates (Wootton and Bell 1992;Stahl and Oli 2006;Krüger et al 2010), even a small reduction in survival, particularly of adults, can drastically reduce population growth rate. Age-specific survival rates (±SE) of peregrines in south Scotland-north England: a overall annual estimates based on the most parsimonious model that included an effect of age on survival [model 1 (a); Table 2], b low-density study period (1974)(1975)(1976)(1977)(1978)(1979)(1980)(1981)(1982) and c highdensity study period (2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010) annual estimates based on the second best (and well-supported) model that included an additive effect of age and study period (model 2; Table 2).…”

Section: Figmentioning

confidence: 99%

Demography of population recovery: survival and fidelity of peregrine falcons at various stages of population recovery

Smith¹,

Murillo‐García

Hostetler

et al. 2015

Oecologia

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Factors influencing vital demographic rates and population dynamics can vary across phases of population growth. We studied factors influencing survival and fidelity of peregrine falcons in south Scotland-north England at two stages of population growth: when the population was recovering from pesticide-related declines and density was low, and when it had largely recovered from pesticide effects and density was high. Fidelity was higher for: adults and subadults than for juveniles, females than for males, and juveniles and adults during the low-density than during the high-density study period. Survival was age specific, with lower survival for juveniles than for older birds (juveniles, 0.600 ± SE 0.063; subadults, 0.811 ± 0.058; adults, 0.810 ± 0.034). Furthermore, there was some evidence that survival was generally lower for all age classes during the low-density period than during the high-density period, possibly due to a chronic, persistent effect of organochlorine pesticides as the population recovered. Evidence for a density-dependent effect on survival was weak, but a negative effect of density on fidelity of juveniles (dispersing age class) during the recovery phase suggests density-dependent dispersal when the population was increasing. Our results show how population density can influence demographic parameters differently and how such influences can vary across phases of population growth.

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“…2008, Evans et al. 2009, Krüger et al. 2010) have addressed the question of the demography of increasing large raptor populations, offering an opportunity to examine factors involved in the regulation of populations, fewer (but see Bretagnolle et al.…”

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confidence: 99%

Long-term breeding demography and density dependence in an increasing population of Golden Eagles Aquila chrysaetos

Fasce

Villers

et al. 2011

Ibis

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International audienceFew studies have quantified the dynamics of recovering populations of large raptors using long-term, spatially explicit studies. Using data collected over 37 years in the western Italian Alps, we assessed the trends in distribution, abundance, fecundity and breeding population structure of Golden Eagles Aquila chrysaetos. Using the spatial distribution of territory centroids in 2007, we found that the spatial distribution of eagle territories was over-dispersed up to 3 km. Although population size and total productivity increased from 1972 to 2008, the proportion of pairs that laid eggs showed a strong decline, falling to no more than 50% after 2003. On average, 15% of successful nests produced two fledglings, and productivity also declined over time. No significant relationship between population growth rate and total population size was detected, but the percentage of pairs that bred and breeding success showed evidence of density dependence, as they declined significantly with increasing density. Our results suggest that density dependence, operating across heterogeneous habitats, is currently regulating this population, while the carrying capacity may still be increasing. This may explain the apparent paradox of reduced breeding effort despite increasing total productivity

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The return of the white-tailed eagle (Haliaeetus albicilla) to northern Germany: Modelling the past to predict the future

Cited by 42 publications

References 61 publications

The demography of a newly establishedOspreyPandion haliaetuspopulation inFrance

The demography of a newly establishedOspreyPandion haliaetuspopulation inFrance

Demography of population recovery: survival and fidelity of peregrine falcons at various stages of population recovery

Long-term breeding demography and density dependence in an increasing population of Golden Eagles Aquila chrysaetos

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