Cross-Fostering New Zealand's Black Stilt

Reed, Christine E. M.; Nilsson, Ron J.; Murray, David P.

doi:10.2307/3809290

Cited by 14 publications

(8 citation statements)

References 3 publications

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“…We investigated the factors influencing the length of the dependence period in released Montagu's Harriers, and compared it with that of birds which fledged naturally. Additionally, the resighting rates and location of naturally fledged and released birds, marked with patagial tags, were examined for differences in important movement patterns such as migration and philopatry (Reed et al 1993).…”

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confidence: 99%

Post‐fledging dependence and dispersal in hacked and wild Montagu's Harriers Circus pygargus

Amar

Arroyo

Bretagnolle

2000

Ibis

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We compared the post-fledging dependence period, dispersal patterns and resighting rates of captive-raised and hacked Montagu's Harriers Circus pygargus with those of wild reared and naturally fledged Montagu's Harriers, in order to assess the validity of haclung as a release technique for this species. Among hacked birds, we found significant relationships between the length of the dependence period and both hatching date and body condition (birds hatched later in the season had shorter periods of dependence; birds in poorer condition had longer periods of dependence). The condition index increased with the amount of time spent in captivity. The length of the dependence period did not differ significantly between released and naturally fledged birds, when hatching dates were accounted for. Observation rates of wing-tagged fledglings in years after marlung were higher for released birds (1 5.5-20.9°/~) than for naturally fledged birds (9.4-9.9940). Released birds also tended to be resighted closer to their released location than did the naturally fledged birds. We suggest that the differences in resighting data are related to the better condition of the released birds, compared with their wild counterparts. We conclude that hacking is apparently a good release technique for captive-reared Montagu's Harriers, and that comparisons of behaviour at the post-fledging period may be a valid method for evaluating the success of release techniques.

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mentioning

confidence: 99%

Post‐fledging dependence and dispersal in hacked and wild Montagu's Harriers Circus pygargus

Amar

Arroyo

Bretagnolle

2000

Ibis

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“…Whether chicks were placed in original or foster nests did not affect acceptance by parents. Acceptance of foster chicks appears to be common among many birds for which artificial incubation and chick placement has been attempted (Reed et al 1993, Lobo and Marini 2013). Adults may not, however, accept foster chicks if they are returned to the nest before the anticipated hatch date of original eggs.…”

Section: Discussionmentioning

confidence: 99%

“…Eggs within the incubator were monitored regularly for signs of hatching and returned to the original nest within 24 hours of hatching. If artificial eggs were lost, washed away, or buried, or if adults discontinued incubation before the collected eggs hatched, chicks were fostered into another headstart nest with a similar estimated hatch date (Reed et al 1993, Lobo and Marini 2013). After chicks were placed in the nest scrape, we observed nests to verify that adults accepted and brooded the returned chicks.…”

Section: Methodsmentioning

confidence: 99%

Assessing conservation tools for an at-risk shorebird: Feasibility of headstarting for American OystercatchersHaematopus palliatus

Collins

Sanders

Jodice

2016

Bird Conservation International

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SummaryManagement of threatened and endangered populations of wildlife increasingly relies upon active intervention such as predator control, habitat manipulation, and ex situ breeding or care. One tool that has received consideration for the management of declining or threatened avian populations is headstarting, or the artificial incubation of eggs and subsequent placement of newly hatched chicks in original or foster nests. We assessed the feasibility of implementing a headstarting program for the American Oystercatcher Haematopus palliatus, a species of high conservation concern in the eastern USA. Annual productivity is often low and lost during incubation, suggesting artificial incubation could enhance annual productivity. We used a control-impact approach to assign nests as either control or headstart and measured daily survival rate, success of parents accepting headstarted chicks, attendance patterns and behaviours of parents, and chick survival. We also implemented a transparent scoring process to rate the success of each step and the overall program. Daily survival rates of nests were significantly higher at headstart compared to control nests, and parents continued to incubate when eggs were well secured at nest sites. Attendance patterns and behaviour did not differ between headstart and control parents, and parents readily accepted healthy chicks whether they were returned to original or foster nests. Chick survival and subsequently annual productivity were, however, not higher at headstart compared to control nests suggesting that although we were able to enhance nest survival, low chick survival was still limiting annual productivity. Ultimately, headstarting may be most appropriate for American Oystercatchers where productivity is lost primarily to flooding, predation, or disturbance during the incubation stage but not during the chick-rearing stage. If, for example, high rates of nest loss are due to predators that also may prey upon chicks, then headstarting may not be an effective conservation tool.

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“…When interactions with parents and exploration opportunities have been provided, no differences in the activity patterns and associations can be seen, as highlighted by research comparing the development of captive killdeer (Charadrius vociferous) cross-fostered to wild spotted sandpipers (Actitis macularia) and wild parent-reared killdeer [40] (Charadrius vociferous); Nonetheless, the use of fostering and cross-fostering alike has expected and unexpected fitness outcomes [41]. As a result, authors have advised against, and limited, the use of fostering as a husbandry technique for reintroduction programmes; due to the potential for unsuitable coping strategies and mate choice both in the wild and in captivity (e.g., [23,40,42]). However, the use of foster rearing techniques can be widespread for particular species across and within zoos.…”

Section: Introductionmentioning

confidence: 99%

Influences of Rearing Environment on Behaviour and Welfare of Captive Chilean Flamingos: A Case Study on Foster-Reared and Parent-Reared Birds

Kidd

Rose

2021

JZBG

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Behaviour signals the internal states that relate to an individual’s welfare and its development is influenced by the early social environment that an animal experiences. Husbandry practices can alter this early social environment, for example different rearing conditions (e.g., foster rearing by a surrogate parent of another species). Widespread implementation of altered rearing can lack empirical support and non-parent-reared animals may experience poorer welfare resulting from maternal deprivation. An opportunity presented itself to measure the effect of foster-rearing on Chilean flamingo behaviour and social preferences at WWT Slimbridge Wetland Centre and compare findings to parent-reared conspecifics in the same time period. Data were collected from April to July 2019 at three timepoints during each observation day. Binomial generalized linear mixed models were used to assess the relationship between focal chicks’ rearing background with behaviour, zone usage, and flock position whilst accounting for climatic factors and visitor numbers. The development of social preferences was assessed using social network analysis. Our results showed limited impacts on flamingo behavioural development due to foster rearing. Foster-reared chicks spent less time feeding, were more likely to occupy the nesting area of the enclosure, and had fewer significant preferred associations than parent-reared chicks, but preferred social bonds were as equally strong and durable for both foster-reared and parent-reared chicks. Our results have important welfare implications for the use of foster-rearing in captive environments; altered early social rearing environments through cross-fostering in Chilean flamingos is associated with limited differences in behavioural and social development.

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Cross-Fostering New Zealand's Black Stilt

Cited by 14 publications

References 3 publications

Post‐fledging dependence and dispersal in hacked and wild Montagu's Harriers Circus pygargus

Post‐fledging dependence and dispersal in hacked and wild Montagu's Harriers Circus pygargus

Assessing conservation tools for an at-risk shorebird: Feasibility of headstarting for American OystercatchersHaematopus palliatus

Influences of Rearing Environment on Behaviour and Welfare of Captive Chilean Flamingos: A Case Study on Foster-Reared and Parent-Reared Birds

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