Measurements of Adult and Hatch-Year Reddish Egrets (<i>Egretta rufescens</i>)

Koczur, Lianne M.; Kent, Gina M.; Geary, Brock; Ballard, Bart M.; Meyer, Kenneth D.; Green, M. Clay

doi:10.1675/063.038.0312

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…We determined the sex of Reddish Egrets using blood samples (n = 13) and genetic samples from collected carcasses of marked individuals that died during the study period (n = 7), as blood samples had not been taken for those individuals. Discriminant analysis was used to determine sex of 15 egrets for which we did not have a DNA sample (Koczur et al 2015).…”

Section: Capture and Transmittersmentioning

confidence: 99%

Space Use and Movements of Adult Reddish Egrets (Egretta rufescens) During Winter

Koczur

Kent²,

Ballard

et al. 2018

Waterbirds

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Section: Capture and Transmittersmentioning

confidence: 99%

Space Use and Movements of Adult Reddish Egrets (Egretta rufescens) During Winter

Koczur

Kent²,

Ballard

et al. 2018

Waterbirds

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“…Furthermore, we performed 2–3 replicate amplifications for each sample, and results were consistent among tissues from the same individual. Previous studies of reddish egrets have reported skewed sex ratios in small samples of hatch‐year and adult birds (Geary et al , Koczur et al ), which may be due in part to the timing or methods of capture. In addition, these carcasses represent mortalities, which may indicate sex‐bias in survival.…”

Section: Discussionmentioning

confidence: 96%

Bringing back the dead: Genetic data from avian carcasses

et al. 2017

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Advances in laboratory methods and DNA sequencing technology have enabled genetic analyses of noninvasive samples, museum specimens, fossil material, and more recently, carcasses. We extracted DNA from decayed avian carcasses that were salvaged from a marine environment in southern Texas, USA, during 2010-2014, at 2 weeks to 3 months postmortem. Extracts of DNA from toepad, bone, and feather yielded usable DNA for molecular sexing and amplification of a 223-base pair portion of the mtDNA control region. Most samples displayed signs of degradation, including small fragment sizes and heteroplasmy in mtDNA sequences consistent with deamination during the decay process. The ability to extract usable DNA from avian carcasses salvaged in a marine environment has implications for the ecology and management of waterbirds, many of which are rare, sexually monomorphic, and poorly understood.

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“…The transmitters recorded six locations per day, at 08:00, 09:00, 16:00, 17:00, 24:00 and 01:00 h (CST), and locations were accurate to 18 m. The locations were downloaded once weekly from the Argos system (http://www.argos-system.org) or automatically downloaded to MoveBank (Wikelski and Kays 2016). Sex was determined from DNA analysis (n = 16), and discriminant analysis (n = 14; Koczur et al 2015, Koczur et al 2017).…”

Section: Methodsmentioning

confidence: 99%

Drivers of partial migration in the reddish egret Egretta rufescens

Koczur,

Ballard

2023

Journal of Avian Biology

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The reddish egret Egretta rufescens is North America's rarest Ardeidae and is listed as ‘Near Threatened' by the IUCN, as endangered in Mexico, and as a species of conservation concern throughout much of its range in the United States. Little is known about the migratory behavior of the reddish egret. Individuals that were banded during the breeding season in Texas, USA, have been resighted away from breeding areas; however, records are limited and the extent of migration is unknown. Using GPS transmitters, we found reddish egrets breeding in southern Texas exhibited a partial migration strategy, with 39% of the marked population migrating from breeding sites. We assessed the dominance, body size, and arrival time hypotheses to better understand the drivers of partial migration. We did not find support for the body size hypothesis and found mixed support for the dominance hypothesis; both males and females migrated, and migratory status of individuals did not change across the years of study. Long‐distance migrants were also larger than resident individuals. We found some support for the arrival time hypothesis; residents began breeding earlier than long‐distance migrants and had moderately greater nest success. However, within long‐distance migrants, an earlier arrival to breeding areas did not necessarily equate to earlier nesting or greater nest success. This study is the first to examine the migratory behavior of adult reddish egrets and assesses the dominance, body size, and arrival time hypotheses as explanations for partial migration in this species. Further, the results of this study emphasize the need for international conservation efforts.

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Measurements of Adult and Hatch-Year Reddish Egrets (Egretta rufescens)

Cited by 6 publications

References 10 publications

Space Use and Movements of Adult Reddish Egrets (Egretta rufescens) During Winter

Space Use and Movements of Adult Reddish Egrets (Egretta rufescens) During Winter

Bringing back the dead: Genetic data from avian carcasses

Drivers of partial migration in the reddish egret Egretta rufescens

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