Phenotypic Sexing of Marbled Godwits (<i>Limosa Fedoa</i>): A Molecular Validation

Ayala-Pérez, Víctor; Carmona, Roberto; Baker, Allan J.; Farmer, Adrian H.; Uraga, Roberto Félix; Arce, Nallely

doi:10.1675/063.036.0412

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Preliminary sex assignments were confirmed in the field by behavioral observations of aerial displays and wing flashing by males, sex roles of males and females during mate guarding and copulations, and by comparing the morphometrics of birds in mated pairs and their partners in different years. Sexing with morphometrics was also validated with genetic methods for a subset of birds captured in Alberta and with related work in other populations (Ayala‐Pérez et al, 2013; Haig et al, 2002). We estimated relative differences between the sexes with the esc_mean_sd function in the esc package of Program R, where the units of effect size for Hedges' g are in standard deviations.…”

Section: Methodsmentioning

confidence: 96%

Breeding populations of Marbled Godwits and Willets have high annual survival and strong site fidelity to managed wetlands

Sandercock

Gratto‐Trevor

2023

Ecology and Evolution

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The Prairie Pothole Region of central Canada supports a diverse community of breeding waterbirds, but many species have declining populations and the demographic mechanisms driving the declines remain unknown. We conducted a 7-year field study during 1995-2001 to investigate the demographic performance of Marbled Godwits (Limosa fedoa) and Willets (Tringa semipalmata) breeding in managed wetlands near Brooks, Alberta. Mark-recapture analyses based on Cormack-Jolly-Seber models revealed that the annual rates of apparent survival for Marbled Godwits ( ̂ = 0.953 ± 0.012SE) and Willets ( ̂ = 0.861 ± 0.015SE) are among the highest rates of survivorship reported for any breeding or nonbreeding population of large-bodied shorebirds. Our estimates of life expectancy for males were comparable to longevity records in godwits (17.3 years ±5.8SE vs. 25-29+ years) and willets (7.7 ± 1.5SE vs.10+ years). The two species both showed strong breeding site fidelity but differed in rates of mate fidelity. Pairs that reunited and males that switched mates usually nested <300 m from their previous nests, whereas females that switched mates usually moved longer distances >1.1-1.5 km. Returning pairs usually reunited in godwits (85%) but not in willets (28%), possibly because of species differences in adult survival or patterns of migration. Baseline estimates of annual survival for banded-only birds will be useful for evaluating the potential effects of new tracking tags or the environmental changes that have occurred during the past 20 years. Conservation strategies for large-bodied shorebirds should be focused on reduction of exposure to anthropogenic mortality because low rates of natural mortality suggest that losses to collisions at breeding sites or harvest at nonbreeding areas are likely to cause additive mortality.

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Section: Methodsmentioning

confidence: 96%

Breeding populations of Marbled Godwits and Willets have high annual survival and strong site fidelity to managed wetlands

Sandercock

Gratto‐Trevor

2023

Ecology and Evolution

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“…Avian DNA can indeed be obtained relatively easily from non-invasive (eggshell swab, shed feather, and feces), nondestructive (plucked feather and buccal swab), or invasive (blood) methods [ 22 , 23 , 24 , 25 , 26 , 27 ]. Molecular sexing is now routinely used to assess the extent of sexual dimorphism in body size and/or variation in sex ratio in monomorphic avian species [ 28 , 29 , 30 , 31 , 32 , 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Estimation of Adult Sex Ratio and Size-Related Sexual Dimorphism Based on Molecular Sex Determination in the Vulnerable La Selle Thrush, Turdus swalesi

Exantus,

Bezault,

Cambrone

et al. 2024

Animals

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Sex-determination is of particular importance in avian ecology and conservation. However, many bird species show no conspicuous sexual dimorphism, such as the La Selle Thrush, Turdus swalesi, a vulnerable species endemic to Hispaniola. We captured individuals in southeastern Haiti, in 2019–2022. For each one, we collected contour feathers or blood samples for molecular sex identification based on the CHD-1 gene. In addition, we took body measurements of several captured individuals and recorded their weight. Out of a total of 65 birds, 45 were identified as males and 20 as females, indicative of a significantly male-biased sex ratio. However, analyses of first captures showed that the sex ratio at our study site was male-biased only outside of the breeding season, suggesting that females may disperse at that time while males remain on their territories. Sexual dimorphism was limited to wing chord length and tail length, with males being larger than females. Tail length was the best predictor of sex in a logistic regression model and correctly classified about 80% of individuals as male or female. We discuss our results in relation to previous studies of sex ratio and sexual dimorphism in turdid species and address their relevance for the conservation of avian species in one of the major protected forest areas in Haiti.

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Male-biased adult sex ratio in non-breeding areas of an extreme long-distance migratory shorebird population

et al. 2020

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Phenotypic Sexing of Marbled Godwits (Limosa Fedoa): A Molecular Validation

Cited by 4 publications

References 13 publications

Breeding populations of Marbled Godwits and Willets have high annual survival and strong site fidelity to managed wetlands

Breeding populations of Marbled Godwits and Willets have high annual survival and strong site fidelity to managed wetlands

Estimation of Adult Sex Ratio and Size-Related Sexual Dimorphism Based on Molecular Sex Determination in the Vulnerable La Selle Thrush, Turdus swalesi

Male-biased adult sex ratio in non-breeding areas of an extreme long-distance migratory shorebird population

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