Survival rates of captive‐bred Asian Houbara <i>Chlamydotis macqueenii</i> in a hunted migratory population

Burnside, Robert J.; Collar, Nigel; Scotland, Keith M.; Dolman, Paul M.

doi:10.1111/ibi.12349

Cited by 18 publications

(25 citation statements)

References 28 publications

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“…Indeed, survival through the entire winter period is known to be low (20%, 95% CI 0.07–0.33, n = 35) for captive‐bred young (Burnside et al . ). Although no similarly robust estimates exist for wild juveniles, in this study seven of 10 survived the winter (70%, 95% CI 0.41–0.98), well above the upper confidence limit of the captive‐bred estimate.…”

Section: Discussionmentioning

confidence: 97%

“…This reinforces the suggestion that although captive‐breeding programmes may usefully provide alternative quarry for hunting, they may contribute less to population recruitment (Burnside et al . ). Notably, all mortality of naïve birds during migration movements took place before January with none in the spring, and those surviving to midwinter maintained sufficient condition to return successfully.…”

Section: Discussionmentioning

confidence: 97%

“…), whereas high winter mortality (Burnside et al . ) limits recruitment to less than 1% per annum relative to wild numbers (Koshkin et al . ).…”

Section: Methodsmentioning

confidence: 99%

“…However, if released captive‐bred birds are to compensate for the loss of wild individuals by recruiting into the predominantly migratory free‐living populations, they must be able to complete their annual return migration (Burnside et al . ). Therefore, the migratory performance of Houbara bred in captivity and released back to the wild needs to be assessed.…”

Section: Metrics Characterizing Migration Movements Of Wild and Captimentioning

confidence: 97%

“…Later, as hunting activities have expanded into Central Asia, captive breeding and release has also been used to reinforce the Asian Houbara's migratory populations (Allinson 2014). However, if released captive-bred birds are to compensate for the loss of wild individuals by recruiting into the predominantly migratory freeliving populations, they must be able to complete their annual return migration (Burnside et al 2016). Therefore, the migratory performance of Houbara bred in captivity and released back to the wild needs to be assessed.…”

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confidence: 99%

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Comparative migration strategies of wild and captive‐bred Asian Houbara Chlamydotis macqueenii

Burnside

Collar

Dolman

2017

Ibis

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For migratory species, the success of population reintroduction or reinforcement through captive-bred released individuals depends on survivors undertaking appropriate migrations. We assess whether captive-bred Asian Houbara Chlamydotis macqueenii from a breeding programme established with locally sourced individuals and released into suitable habitat during spring or summer undertake similar migrations to those of wild birds. Using satellite telemetry, we compare the migrations of 29 captive-bred juveniles, 10 wild juveniles and 39 wild adults (including three birds first tracked as juveniles), examining migratory propensity (proportion migrating), timing, direction, stopover duration and frequency, efficiency (route deviation), and wintering and breeding season locations. Captive-bred birds initiated autumn migration an average of 20.6 (AE4.6 se) days later and wintered 470.8 km (AE76.4) closer to the breeding grounds, mainly in Turkmenistan, northern Iran and Afghanistan, than wild birds, which migrated 1217.8 km (AE76.4), predominantly wintering in southern Iran and Pakistan (juveniles and adults were similar). Wintering locations of four surviving captive-bred birds were similar in subsequent years (median distance to first wintering site = 70.8 km, range 6.56-221.6 km), suggesting that individual captive-bred birds (but not necessarily their progeny) remain faithful to their first wintering latitude. The migratory performance of captive-bred birds was otherwise similar to that of wild juveniles. Although the long-term fitness consequences for captivebred birds establishing wintering sites at the northern edge of those occupied by wild birds remain to be quantified, it is clear that the pattern of wild migrations established by long-term selection is not replicated. If the shorter migration distance of young captivebred birds has a physiological rather than a genetic basis, then their progeny may still exhibit wild-type migration. However, as there is a considerable genetic component to migration, captive breeding management must respect migratory population structure as well as natal and release-site fidelity.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

“…), whereas high winter mortality (Burnside et al . ) limits recruitment to less than 1% per annum relative to wild numbers (Koshkin et al . ).…”

Section: Methodsmentioning

confidence: 99%

Section: Metrics Characterizing Migration Movements Of Wild and Captimentioning

confidence: 97%

mentioning

confidence: 99%

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Comparative migration strategies of wild and captive‐bred Asian Houbara Chlamydotis macqueenii

Burnside

Collar

Dolman

2017

Ibis

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Captive‐bred ancestry affects spatial patterns of genetic diversity and differentiation in brown trout (Salmo trutta) populations

Prunier

Saint‐Pé

Tissot

et al. 2022

Aquatic Conservation

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1. Intraspecific genetic diversity is heterogeneously distributed in natural landscapes and often forms repeatable spatial patterns. For instance, in rivers, genetic diversity increases towards downstream areas, whereas genetic differentiation increases in isolated upstream areas. Nonetheless, these patterns can be modified by human-induced perturbations, and documenting the extent to which human activities alter these natural patterns is important for conservation. Among the human pressures that affect freshwater biodiversity, stocking natural populations with captive-bred strains is a common practice worldwide that can strongly alter the genetic integrity of wild populations.2. The main objectives of this study were to document the spatial distribution of captive-bred ancestry in brown trout (Salmo trutta) populations from four French basins having been stocked according to different practices, and to quantify for each basin the effect of captive-bred ancestry on the spatial distribution of genetic diversity and differentiation. The four basins were sampled along their upstream-downstream gradient, and a total of 1,686 individuals were genotyped at 192 single nucleotide polymorphism loci.3. For all basins, individuals with a strong assignment to the captive strain were mostly found in upper reaches, although the average proportion of captive-bred ancestry varied strikingly among rivers (from 1.9 to 58.7%). Although spatial patterns of genetic differentiation were not affected by introgression and showed an expected increase with increasing distances from the river mouth in all basins, there was evidence that the classical pattern of downstream increase in genetic diversity was reversed when considering highly introgressed populations.4. These findings demonstrate that the stocking of captive-bred strains can strongly modify natural spatial patterns of diversity, even when stocking occurred many generations ago and has now ended. The study illustrates the major impacts of humans on intraspecific biodiversity patterns, and emphasizes the importance of conservation plans that take into account this artificial distribution of genetic diversity.Jérôme G. Prunier and Keoni Saint-Pé are co-first authors.

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Captive Breeding, Handling and Care, and the Impact of Releases on Wild Populations

Attié

Muñoz-Silva

Chevasson

et al. 2022

Wildlife Research Monographs

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Survival rates of captive‐bred Asian Houbara Chlamydotis macqueenii in a hunted migratory population

Cited by 18 publications

References 28 publications

Comparative migration strategies of wild and captive‐bred Asian Houbara Chlamydotis macqueenii

Comparative migration strategies of wild and captive‐bred Asian Houbara Chlamydotis macqueenii

Captive‐bred ancestry affects spatial patterns of genetic diversity and differentiation in brown trout (Salmo trutta) populations

Captive Breeding, Handling and Care, and the Impact of Releases on Wild Populations

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