Breeding Success and its Correlation with Nest-Site Characteristics: A Study of a Griffon Vulture Colony in Gamla, Israel

Freund, Myriam; Bahat, Ofer; Motro, Uzi

doi:10.3356/jrr-16-15.1

Cited by 17 publications

(15 citation statements)

References 13 publications

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“…It has been reported that nests are approximately 1 m in width and depth in Greece and Yemen [26; 43]. Similar study has conducted with another cliff nesting vulture population (Gyps fulvus) in Gamla Nature Reserve and authors reported that the nest-sites in caves are more successful and productive than the nest-sites on open ledges [47]. However we did not analyze statistically whether the nest-site features are preference or not.…”

Section: Conclusion and Discussionmentioning

confidence: 74%

Nest characteristics of Egyptian vulture (Neophron percnopterus) in Middle and Upper Sakarya Region, Turkey

Balaban¹,

Yamaç²

2019

BioDiCon

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Egyptian vulture is an endangered vulture species all over the World. Turkey holds the substantial amount of the global population of the species in Western Palearctic. Middle and Upper Sakarya Region is an important host for the breeding Egyptian vulture population in Anatolia. In total 37 occupied nests were recorded in 2013 and 2014 years. In order to determine the nest characteristics 11 nest variables and cliff features were evaluated in this study. Egyptian vulture nests were determined both in hollows (n= 24) and on ledges (n= 13) at the middle part of the small limestone cliffs in the study area. The mean ± SD of cavity width and height are 2.0 ± 1.0 and 1.5 ± 0.6, respectively. Nests were situated predominantly southwestern exposure. Although the first data is given in this study about nest characteristics in the region, detailed studies are required on the relationship between nest site quality and breeding parameters to undertake conservation strategies for Egyption vulture in Turkey.

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Section: Conclusion and Discussionmentioning

confidence: 74%

Nest characteristics of Egyptian vulture (Neophron percnopterus) in Middle and Upper Sakarya Region, Turkey

Balaban¹,

Yamaç²

2019

BioDiCon

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“…Note that chainlinks that belong to the same nest-site are not independent, because of possible nest-site fidelity by specific vultures. In addition, we expect better nest-sites to be occupied more often (Freund et al 2017), and as a result to contain more chain-links. Therefore, we can either randomly choose only one chain-link from each nest-site, or analyze each year separately.…”

Section: Statistical Analysis and Resultsmentioning

confidence: 94%

“…We studied nest-sites and reproduction in Gamla Nature Reserve from 1998 to 2002, in order to relate the physical characteristics of each nest-site to the frequency of breeding attempts, their starting date, the hatching and the fledging success (Freund et al 2017). A nest-site was defined as a niche -either a small cave, or a partly protected (by a tree, sidewalls or a partial roof) ledge or an exposed ledge -in which at least once during the years of our study, an egg laying event was recorded.…”

Section: Data Collectionmentioning

confidence: 99%

Nest-Site Fidelity in Griffon Vultures: A Case of Win–Stay/Lose–Shift?

Freund

Bahat

Motro

2017

Israel Journal of Ecology and Evolution

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We studied the use of nest-sites by Griffon Vultures (Gyps fulvus) and the breeding success in these sites during 1998–2002 in Gamla Nature Reserve (Israel). Nest-sites in which a breeding attempt succeeded in fledging a young, were more likely to be occupied by nesting vultures in the following breeding season, than nest-sites that experienced a failure. This suggests that Griffon Vultures in Gamla used a Win–Stay/Lose–Shift strategy regarding nest-site fidelity.

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“…Preferences changed over time, which may signal the presence of a latent conservation problem that is not obvious in daily observations. Until 2003, the East side of the GNR Gorge was favorable for breeding (Freund et al ). It is possible that the gregarious nature of this species drew more individuals to roost on the East side, which already hosted nesting pairs.…”

Section: Discussionmentioning

confidence: 99%

Long‐term griffon vulture population dynamics at Gamla Nature Reserve

et al. 2018

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Gamla Nature Reserve (GNR) used to host the largest colony of Eurasian griffon vultures (Gyps fulvus) in northern Israel. Since the early 2000s, the colony has suffered a drastic decline, which could lead to its extinction. In this descriptive study we present the population dynamics at GNR based on an analysis of data collected over 15 years (1999–2013). A monitoring scheme of monthly counts, developed at GNR, provided a database, facilitating a mathematical analysis of the population decline trends and their seasonal fluctuations. The analysis revealed a decline in the population size, which appears similar to an inverse‐sigmoid and indicates a potential extinction of the colony by 2020. The analysis also indicates that, in addition to the overall pattern, the number of vultures fluctuates seasonally, with smaller numbers in spring and greater numbers in autumn and winter. Furthermore, this model suggests that latent factors might have influenced the decline; poisoning, thought to be a root cause, might not be the only factor influencing extinction. We demonstrate the importance of combining frequent data collection with modeling techniques for the analysis of raptor population trends. © 2018 The Wildlife Society.

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Breeding Success and its Correlation with Nest-Site Characteristics: A Study of a Griffon Vulture Colony in Gamla, Israel

Cited by 17 publications

References 13 publications

Nest characteristics of Egyptian vulture (Neophron percnopterus) in Middle and Upper Sakarya Region, Turkey

Nest characteristics of Egyptian vulture (Neophron percnopterus) in Middle and Upper Sakarya Region, Turkey

Nest-Site Fidelity in Griffon Vultures: A Case of Win–Stay/Lose–Shift?

Long‐term griffon vulture population dynamics at Gamla Nature Reserve

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