Survival and Behavior of Juvenile Black-Capped Vireos (<i>Vireo atricapilla</i>)

Dittmar, Erika; Cimprich, David A.; Sperry, Jinelle H.

doi:10.1676/15-167.1

Cited by 4 publications

(7 citation statements)

References 52 publications

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“…Juvenile birds are particularly limited at two points during the post-fledging period: at the start of the parental care stage when juveniles have limited mobility and remain dependent on care (Anders et al 1997, Kershner et al 2004, Ausprey & Rodewald 2011, Vitz & Rodewald 2011 and at the onset of independence when juveniles lack experience and fend for themselves (Kershner et al 2004, Gr€ uebler & Naef-Daenzer 2010b, Dittmar et al 2016. We found that apparent survival was lowest between 15 and 21 days, suggesting that the beginning of the parental care period is a costly time for juvenile Barn Swallows.…”

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confidence: 61%

“…, Grüebler & Naef‐Daenzer 2010b, Dittmar et al . ). We found that apparent survival was lowest between 15 and 21 days, suggesting that the beginning of the parental care period is a costly time for juvenile Barn Swallows.…”

Section: Discussionmentioning

confidence: 97%

“…Once juveniles become independent, they often leave their natal area (Dittmar et al . ) and become even more challenging to follow (e.g. Berkeley et al .…”

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confidence: 99%

“…High post-fledging mortality typically occurs in the first weeks following fledging when juveniles have limited mobility and remain dependent on parental care, making them conspicuous to predators and vulnerable to environmental conditions (hereafter the 'parental care period'; Anders et al 1997, Kershner et al 2004, Ausprey & Rodewald 2011, Vitz & Rodewald 2011. Once juveniles become independent and increasingly mobile, they still must learn to navigate, acquire resources and evade predators, which can result in reduced survival (hereafter the 'independence period'; Anders et al 1997, Kershner et al 2004, Mitchell et al 2010, Dittmar et al 2016.…”

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confidence: 99%

“…Such studies have also been limited temporally and spatially to when juveniles remain close to their natal area. Once juveniles become independent, they often leave their natal area (Dittmar et al 2016) and become even more challenging to follow (e.g. Berkeley et al 2007, Mitchell et al 2010, Vernasco et al 2017) and, as a consequence, individuals are either censored in the analysis or assumed to have survived until migration (Anders et al 1997, Kershner et al 2004, Suedkamp Wells et al 2007.…”

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confidence: 99%

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Individual condition, but not fledging phenology, carries over to affect post‐fledging survival in a Neotropical migratory songbird

Evans

Hobson

Kusack

et al. 2019

Ibis

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Migratory animals face severe time and energy constraints during their annual cycle. These constraints may be exacerbated in young animals by conditions experienced during development that can affect both phenotype and phenology. For young migratory songbirds, the period between fledging and autumn migration, the post‐fledging period, is believed to represent a time of intense selective pressure. However, there has yet to be a study that has assessed post‐fledging survival for the entirety of the post‐fledging period, probably due to the challenge of following juveniles as they move broadly across the landscape (tens to hundreds of kilometres). To overcome this challenge, we used an automated radiotelemetry array spanning 60 000 km2 in southern Ontario, Canada, and miniature digital radiotelemetry tags to track 216 juvenile Barn Swallows Hirundo rustica continuously from fledging to migration. We hypothesized that young that fledged in better condition and earlier in the breeding season would have higher survival relative to birds fledging in poorer condition, because they have more energy to deal with resource constraints, and that early‐fledging birds would depart on migration earlier than late‐fledging birds because there is probably a fixed period of time required post‐fledging to prepare for migration. We found that average cumulative apparent survival was 42% and that condition in the nest was a strong positive predictor of post‐fledging apparent survival. We also found that birds that fledged earlier in the season departed on migration earlier in the autumn relative to late‐fledging birds. Contrary to our prediction, average apparent survival was equal for early‐ and late‐fledging birds. Our results suggest that factors during development that promote better nestling condition are critical for predicting future apparent survival prior to migration. Differences in annual apparent survival between early‐ and late‐fledging songbirds, as commonly observed, may be driven by events occurring at later stages of the annual cycle.

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confidence: 61%

Section: Discussionmentioning

confidence: 97%

“…Once juveniles become independent, they often leave their natal area (Dittmar et al . ) and become even more challenging to follow (e.g. Berkeley et al .…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Individual condition, but not fledging phenology, carries over to affect post‐fledging survival in a Neotropical migratory songbird

Evans

Hobson

Kusack

et al. 2019

Ibis

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No evidence of sex ratio manipulation by black-throated blue warblers in response to food availability

Kaiser,

Grabenstein,

Sillett

et al. 2023

Behav Ecol Sociobiol

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Post‐fledging ecology of endangered Golden‐cheeked Warblers

et al. 2021

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Recently fledged birds often experience low survival as they undergo rapid changes in their behavior, (e.g., habitat use, mobility, and foraging rate). For species of conservation concern, information about the post‐fledging period can be critical for effective management and conservation. We investigated the post‐fledging ecology of endangered Golden‐cheeked Warblers (Setophaga chrysoparia) in central Texas. Current management guidelines focus on nesting habitat even though songbird fledglings may use entirely different habitats. We radio‐tracked fledglings (N = 23) to assess their habitat use, estimate daily survival, and observe age‐based behavioral changes. Habitat used by fledglings was similar to adult nesting habitat and was dominated by Ashe juniper (Juniperus asheii; 75%) and oak (Quercus spp.; 21%). Apparent fledgling survival was 65%, and the estimated daily survival rate of fledglings during their first 4 weeks post‐fledging was 0.985 (95% CI = 0.971–0.993). To investigate the factors associated with predation, we estimated survival while excluding mortality events due to exposure. Estimated survival was greater in areas with more junipers than oaks. As fledglings aged, use of oaks as foraging substrates increased as did their prey capture rates (nearly twice as many prey captured per hour in oaks than in junipers). Current management recommendations for nesting adult Golden‐cheeked Warblers specify maintaining mature juniper–oak forests composed of ~70% juniper, a recommendation that also appears to accommodate fledglings. Fledgling Golden‐cheeked Warblers acquire unique benefits from junipers (i.e., safety) and oaks (i.e., foraging opportunities), so management plans should include the maintenance of both junipers and oaks.

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Survival and Behavior of Juvenile Black-Capped Vireos (Vireo atricapilla)

Cited by 4 publications

References 52 publications

Individual condition, but not fledging phenology, carries over to affect post‐fledging survival in a Neotropical migratory songbird

Individual condition, but not fledging phenology, carries over to affect post‐fledging survival in a Neotropical migratory songbird

No evidence of sex ratio manipulation by black-throated blue warblers in response to food availability

Post‐fledging ecology of endangered Golden‐cheeked Warblers

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