37. Brown-headed Cowbird Control on Kirtland's Warbler Nesting Areas in Michigan, 1972-1995

DeCapita, Michael E.

doi:10.7560/777385-039

Cited by 10 publications

(1 citation statement)

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“…Puncturing of host eggs by parasite females resulting in brood reduction and often in nest abandonment was identified as the main impact of Shiny Cowbird parasitism on the reproductive success of Yellow Cardinals (Domı ´nguez et al 2015). Brood parasitism by cowbirds has been suggested to compromise the viability of populations of threatened species by negatively affecting the reproductive success of hosts (Brittingham and Temple 1983, DeCapita 2000, Rothstein and Cook 2000, Oppel et al 2004.…”

Section: Introductionmentioning

confidence: 99%

Brood parasitism leads to zero recruitment in the globally endangered Yellow CardinalGubernatrix cristata

Atencio

Reboreda

Mahler

2020

Bird Conservation International

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Summary The Yellow Cardinal Gubernatrix cristata is an ‘Endangered’ passerine from southern South America. For the past three years a management plan for Yellow Cardinals has been implemented in Argentina, in which rescued individuals from the illegal cage bird trade were released back into suitable habitats within their population of origin. We studied the reproductive success of a mixed population of released and wild Yellow Cardinals in La Pampa province, Argentina, during the reproductive season of 2019. The population was highly parasitized by the brood parasitic Shiny Cowbird Molothrus bonariensis. The frequency of parasitism was 100% and the intensity of parasitism was 4.5 ± 3.4 (mean ± SD) eggs per parasitized nest (range 1–13). No Yellow Cardinal chicks were recruited in the monitored nests, mainly as a consequence of Shiny Cowbird parasitism. The unusually high rate of parasitism led to a poor outcome of the reintroduction programme and indicates the need to update the conservation actions that have been carried out for the Yellow Cardinal so far. Shiny Cowbird abundance varies within the distribution of Yellow Cardinals, related to habitat modification and farming activities. Thus, further research on habitat suitability and assessment of Shiny Cowbird abundance should be incorporated into future strategies for the conservation of the Yellow Cardinal.

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Section: Introductionmentioning

confidence: 99%

Brood parasitism leads to zero recruitment in the globally endangered Yellow CardinalGubernatrix cristata

Atencio

Reboreda

Mahler

2020

Bird Conservation International

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Influence of climate change and postdelisting management on long‐term population viability of the conservation‐reliant Kirtland's Warbler

Brown

Donner

Ribic

et al. 2019

Ecology and Evolution

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Rapid global climate change is resulting in novel abiotic and biotic conditions and interactions. Identifying management strategies that maximize probability of long‐term persistence requires an understanding of the vulnerability of species to environmental changes. We sought to quantify the vulnerability of Kirtland's Warbler (Setophaga kirtlandii), a rare Neotropical migratory songbird that breeds almost exclusively in the Lower Peninsula of Michigan and winters in the Bahamian Archipelago, to projected environmental changes on the breeding and wintering grounds. We developed a population‐level simulation model that incorporates the influence of annual environmental conditions on the breeding and wintering grounds, and parameterized the model using empirical relationships. We simulated independent and additive effects of reduced breeding grounds habitat quantity and quality, and wintering grounds habitat quality, on population viability. Our results indicated the Kirtland's Warbler population is stable under current environmental and management conditions. Reduced breeding grounds habitat quantity resulted in reductions of the stable population size, but did not cause extinction under the scenarios we examined. In contrast, projected large reductions in wintering grounds precipitation caused the population to decline, with risk of extinction magnified when breeding habitat quantity or quality also decreased. Our study indicates that probability of long‐term persistence for Kirtland's Warbler will depend on climate change impacts to wintering grounds habitat quality and contributes to the growing literature documenting the importance of considering the full annual cycle for understanding population dynamics of migratory species.

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Distance from riparian edge reduces brood parasitism of southwestern willow flycatchers, whereas parasitism increases nest predation risk

Stumpf

Theimer

McLeod³

et al. 2011

J Wildl Manag

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The southwestern willow flycatcher (Empidonax traillii extimus) is a federally endangered subspecies that breeds in increasingly fragmented and threatened habitat. We examined whether temporal and habitat characteristics were associated with risk of predation and probability of brood parasitism by brown-headed cowbirds (Molothrus ater) on flycatcher nests at 6 sites in southern Nevada and northwestern Arizona, USA. For nest predation, we found the most support for a model that included date and an interaction between parasitism status and nesting stage. Daily nest survival decreased from 0.87 (95% CI ¼ 0.81-0.93) to 0.78 (95% CI ¼ 0.72-0.84) through the season for parasitized nests but remained relatively constant for unparasitized nests (0.93, 95% CI ¼ 0.91-0.95 to 0.92, 95% CI ¼ 0.91-93). Parasitized nests had lower survival than non-parasitized nests during the incubation (0.85, 95% CI ¼ 0.84-0.86 vs. 0.92, CI ¼ 0.91-0.93) and nestling (0.79, 95% CI ¼ 0.77-0.81 vs. 0.91, 95% CI ¼ 0.90-0.92) stages. Of the variables included in our parasitism candidate models, model-averaged coefficients and odds ratios supported only distance to habitat edge; odds of parasitism decreased 1% for every 1 m from the habitat edge. Nests greater than 100 m from an edge were 50% less likely to be parasitized as those on an edge, however, only 52 of 233 nests (22%) were found at this distance. Where management and conservation goals include reducing nest losses due to parasitism, we recommend restoration of habitat patches that minimize edge and maximize breeding habitat further from edges. At sites where cowbirds have been documented as important nest predators, controlling cowbirds may be one option, but further study of the link between parasitism and nest predation and the identification of major nest predators at specific sites is warranted. ß 2011 The Wildlife Society.KEY WORDS brown-headed cowbird, Empidonax traillii extimus, habitat, lower Colorado River, Molothrus ater, nest predation, southwestern willow flycatcher.

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37. Brown-headed Cowbird Control on Kirtland's Warbler Nesting Areas in Michigan, 1972-1995

Cited by 10 publications

References 0 publications

Brood parasitism leads to zero recruitment in the globally endangered Yellow CardinalGubernatrix cristata

Brood parasitism leads to zero recruitment in the globally endangered Yellow CardinalGubernatrix cristata

Influence of climate change and postdelisting management on long‐term population viability of the conservation‐reliant Kirtland's Warbler

Distance from riparian edge reduces brood parasitism of southwestern willow flycatchers, whereas parasitism increases nest predation risk

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