Reproductive manipulation in the Whooping Crane <i>Grus americana</i>

Kuyt, Ernie

doi:10.1017/s095927090000126x

Cited by 28 publications

(7 citation statements)

References 1 publication

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“…The hatching success of tested and untested eggs was compared during the period 1985-1988. The hatching success of viable single eggs placed in nests was 11.7-15.5% greater than that of untested eggs (Kuyt 1996). The Wood Buffalo population has increased despite the removal of eggs and without the addition of captive-reared birds.…”

Section: Manipulation Of Wild Crane Eggsmentioning

confidence: 95%

A review of the success of major crane conservation techniques

Davis

1998

Bird Conservation International

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SummaryThe purpose of this paper is to review the success of different crane conservation techniques in order to determine which combinations of techniques are most promising. Six major crane conservation techniques were defined and a literature review was conducted. A summary of each technique was prepared, including several examples of the technique's use and possible negative effects. All of the evaluated techniques were successful in at least some cases. Habitat and legal protection are general measures that are required for every species regardless of other conservation techniques being used. Artificial feeding is successful in rapidly bolstering some crane populations but may not be desirable as a long-term conservation technique. Powerline modification or removal should be used to preserve all localized or endangered crane populations. The release of captive-reared cranes shows promise as a conservation technique but should only be used as a last resort. Likewise, manipulation of wild crane eggs should only be used when absolutely necessary to establish or bolster captive flocks.

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Section: Manipulation Of Wild Crane Eggsmentioning

confidence: 95%

A review of the success of major crane conservation techniques

Davis

1998

Bird Conservation International

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“…These eggs are then either returned to the wild at a later stage of incubation or hatched in captivity, with the chicks being captive‐reared and either retained for breeding programmes or released into the wild as juveniles or adults. Egg pulling may be employed if there are ‘surplus’ eggs, for example in the Whooping Crane ( Grus americana ) where two eggs are typically laid but only one chick usually survives (Supplementary Material; Kuyt, 1996). Eggs may also be pulled if they are at risk in the nest, for example to prevent incubating Peregrine Falcons ( Falco peregrinus ) from accidentally smashing eggs that were thin‐shelled due to DDE contamination (e.g.…”

Section: Conservation Management Interventions For Hatching Failure: Benefits and Challengesmentioning

confidence: 99%

Why do eggs fail? Causes of hatching failure in threatened populations and consequences for conservation

Assersohn

Marshall

Morland

et al. 2021

Animal Conservation

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Reproductive failure is ubiquitous. However, research on the mechanisms underpinning reproductive failure is still lacking in most species. This gap in our understanding has particularly strong repercussions for threatened species and it hinders our ability to establish effective interventions to improve survival. In this review, we focus on why eggs fail to hatchone of the most critical and understudied aspects of bird reproduction. We identify the main drivers of hatching failure in threatened populations of birds and the key mechanisms that cause failure at different stages of development inside the egg. We then discuss the importance of management interventions aimed at reducing hatching failure in species of conservation concern. Our review highlights the need for a better understanding of the mechanistic basis of hatching failure in non-model bird species and identifies the methodological tools necessary to achieve this.

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“…Currently, there is only one natural migratory population. This population migrates between wintering grounds in Aransas National Wildlife Refuge, Texas, and breeding grounds in Wood Buffalo National Park, Canada (Kuyt, 1995, 1996). There are also several captive populations, established by collecting fertile eggs from the wild population and rearing them in captivity.…”

Section: Whooping Cranesmentioning

confidence: 99%

“…One such decision concerns whether to manipulate eggs in the nests of the migratory population. Prior to 1967, no egg collection was performed, but after that year, fertile eggs have been collected from some nests for the establishment of the captive populations (Kuyt, 1995, 1996). Occasionally, a single egg has been taken from nests with 2 fertile eggs, and substituted for an infertile egg in a nest with no fertile eggs.…”

Section: Whooping Cranesmentioning

confidence: 99%

Demographic Analysis from Summaries of an Age‐Structured Population

Link¹,

Royle²,

Hatfield³

2003

Biometrics

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Demographic analyses of age-structured populations typically rely on life history data for individuals, or when individual animals are not identified, on information about the numbers of individuals in each age class through time. While it is usually difficult to determine the age class of a randomly encountered individual, it is often the case that the individual can be readily and reliably assigned to one of a set of age classes. For example, it is often possible to distinguish first-year from older birds. In such cases, the population age structure can be regarded as a latent variable governed by a process prior, and the data as summaries of this latent structure. In this article, we consider the problem of uncovering the latent structure and estimating process parameters from summaries of age class information. We present a demographic analysis for the critically endangered migratory population of whooping cranes (Grus americana), based only on counts of first-year birds and of older birds. We estimate age and year-specific survival rates. We address the controversial issue of whether management action on the breeding grounds has influenced recruitment, relating recruitment rates to the number of seventh-year and older birds, and examining the pattern of variation through time in this rate.

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Reproductive manipulation in the Whooping Crane Grus americana

Cited by 28 publications

References 1 publication

A review of the success of major crane conservation techniques

A review of the success of major crane conservation techniques

Why do eggs fail? Causes of hatching failure in threatened populations and consequences for conservation

Demographic Analysis from Summaries of an Age‐Structured Population

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