How do different releasing techniques affect the survival of reintroduced grey partridges Perdix perdix?

Buner, Francis; Schaub, Michael

doi:10.2981/0909-6396(2008)14[26:hddrta]2.0.co;2

Cited by 42 publications

(48 citation statements)

References 55 publications

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“…Thus, for Whooping Cranes released in Florida, the key structural uncertainty is whether survival and reproductive performance of WF birds is similar to that of their CR parents. In fact, based on other bird reintroduction case studies, captive-rearing effects that reduce the demographic performance of first-generation birds as compared to their wild-reared offspring may well exist (Buner and Schaub 2008;Heath et al 2008;Roche et al 2008).…”

Section: Discussionmentioning

confidence: 96%

“…This is an important source of uncertainty because the performance of wild-fledged birds has often been observed to exceed that of captive-reared birds (Buner and Schaub 2008;Heath et al 2008;Roche et al 2008). Because the Florida population has seen too few wild-fledged birds to make reliable inferences (only two of the wild-fledged females had entered breeding states at the time parameter estimation was completed), decisionmaking about releases should be considered in the light of plausible alternative hypotheses (Williams et al 2002).…”

Section: Alternatives To the Baseline Modelmentioning

confidence: 99%

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Evaluating release alternatives for a long-lived bird species under uncertainty about long-term demographic rates

Moore

Converse²,

Folk

et al. 2010

J Ornithol

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The release of animals to reestablish an extirpated population is a decision problem that is often attended by considerable uncertainty about the probability of success. Annual releases of captive-reared juvenile Whooping Cranes (Grus americana) were begun in 1993 in central Florida, USA, to establish a breeding, non-migratory population. Over a 12-year period, 286 birds were released, but by 2004, the introduced flock had produced only four wildfledged birds. Consequently, releases were halted over managers' concerns about the performance of the released flock and uncertainty about the efficacy of further releases. We used data on marked, released birds to develop predictive models for addressing whether releases should be resumed, and if so, under what schedule. To examine the outcome of different release scenarios, we simulated the survival and productivity of individual female birds under a baseline model that recognized age and breeding-class structure and which incorporated empirically estimated stochastic elements. As data on wild-fledged birds from captive-reared parents were sparse, a key uncertainty that confronts release decision-making is whether captive-reared birds and their offspring share the same vital rates. Therefore, we used data on the only population of wild Whooping Cranes in existence to construct two alternatives to the baseline model. The probability of population persistence was highly sensitive to the choice of these three models. Under the baseline model, extirpation of the population was nearly certain under any scenario of resumed releases. In contrast, the model based on estimates from wild birds projected a high probability of persistence under any release scenario, including cessation of releases. Therefore, belief in either of these models suggests that further releases are an ineffective use of resources. In the third model, which simulated a population Allee effect, population persistence was sensitive to the release decision: high persistence probability was achieved only through the release of more birds, whereas extirpation was highly probable with cessation of releases. Despite substantial investment of time and effort in the release program, evidence collected to date does not favor one model over another; therefore, any decision about further releases must be made under considerable biological uncertainty. However, given an assignment of credibility weight to each model, a best, informed decision about releases can be made under uncertainty. Furthermore, if managers can periodically revisit the release decision and collect monitoring data to further inform the models, then managers have a basis for confronting uncertainty and adaptively managing releases through time.

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Section: Discussionmentioning

confidence: 96%

Section: Alternatives To the Baseline Modelmentioning

confidence: 99%

Evaluating release alternatives for a long-lived bird species under uncertainty about long-term demographic rates

Moore

Converse²,

Folk

et al. 2010

J Ornithol

View full text Add to dashboard Cite

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“…Researchers should also design studies which examine the effect of banding and radio-tagging on individuals, and also evaluate which methods provide the most reliable demographic data (Terhune et al, 2007;Palmer and Wellendorf, 2007;Buner and Schaub, 2008). These devices should be fitted a couple of weeks before the birds are released to allow full acclimatisation to them.…”

Section: Markingmentioning

confidence: 99%

Guidelines for the re-introduction of Galliformes for conservation purposes

IUCN¹

2009

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“…The rearing technique can be considered natural when eggs and chicks are cared for by their natural parents (Scott and Carpenter, 1987, Buner and Schaub, 2008, Sokos et al, 2008.…”

Section: Introductionmentioning

confidence: 99%

First Evaluation of Different Captive Rearing Techniques for the Re-Establishment of the Red Legged Partridge Populations

Santilli¹,

Galardi²,

Bagliacca

2012

Avian Biology Research

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In Tuscany, the red-legged partridge (Alectoris rufa) became extinct at the beginning of the 20th century. Recently, some attempts have been made to re-establish wild populations in Tuscany using farm reared birds, but in most cases the released populations have shown difficulties in reaching sufficient viability, even in areas where the habitat can be considered suitable. Modern technologies for rearing game-birds may be not suitable for reintroduction purposes. For this reason we carried out preliminary research to evaluate the survival of red legged partridges reared under natural condition (Natural) compared to those farm reared (Artificial). Natural rearing occurred in a large pen where birds were allowed to mate freely and to nest. Natural reared birds reached a larger size than artificially-reared birds. Partridges were released in a 7.56 sq km protected area located in the province of Leghorn (western Tuscany, Italy). We followed the fate of 22 young radio-tagged red-legged female partridges (half Natural and half Artificial) and 56 young red-legged partridges (25 Artificial and 31 Natural) marked with different coloured ponchos. The survival of Natural radio-tagged red-legged partridges was double that of the Artificial red-legged partridges. After six months, the re-sighting rate of the Natural poncho-marked birds reached 22.6% whereas none of the Artificial stock was re-sighted. The preliminary results of this research suggest that Natural rearing may be an important tool to improve the success of partridge reintroduction

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How do different releasing techniques affect the survival of reintroduced grey partridges Perdix perdix?

Cited by 42 publications

References 55 publications

Evaluating release alternatives for a long-lived bird species under uncertainty about long-term demographic rates

Evaluating release alternatives for a long-lived bird species under uncertainty about long-term demographic rates

Guidelines for the re-introduction of Galliformes for conservation purposes

First Evaluation of Different Captive Rearing Techniques for the Re-Establishment of the Red Legged Partridge Populations

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