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Sex-dependent foraging effort and vigilance in coal-crested finches, Charitospiza eucosma (Aves: Emberizidae) during the breeding season: evidence of female-biased predation?

Sexual dimorphism in birds is often attributed to sexual selection, but another interpretation suggests the evolution of this phenomenon by natural selection. Predation may be an important selective pressure, acting mainly on females. In this study, I tested the latter hypothesis on the coal-crested...

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Main Author: Alves, Pedro Diniz
Format: Artigo
Language: English
Published: Sociedade Brasileira de Zoologia 2017
Subjects:
Aves - comportamento
Predação (Biologia)
Sexo (Biologia)
Dimorfismo sexual
Online Access: http://repositorio.unb.br/handle/10482/28247
https://dx.doi.org/10.1590/S1984-46702011000200003
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spelling ir-10482-282472022-03-04T16:15:17Z Sex-dependent foraging effort and vigilance in coal-crested finches, Charitospiza eucosma (Aves: Emberizidae) during the breeding season: evidence of female-biased predation? Alves, Pedro Diniz Aves - comportamento Predação (Biologia) Sexo (Biologia) Dimorfismo sexual Sexual dimorphism in birds is often attributed to sexual selection, but another interpretation suggests the evolution of this phenomenon by natural selection. Predation may be an important selective pressure, acting mainly on females. In this study, I tested the latter hypothesis on the coal-crested finch (Charitospiza eucosma Oberholser, 1905) in a neotropical savanna of the Central Brazil (Cerrado). I used capture methods for ascertaining the sex ratio in the population, and focal observations to gather behavioral data. My results show that the sex ratio is skewed toward males (1:1.39). Males were more vigilant, vocalized for longer periods of time, and used higher perches than females. Females foraged more, spent more time on parental care and remained on the ground for longer periods than males. These results support the 'foraging effort hypothesis, suggesting that females are more preyed upon because they spend more time foraging. Ultimately, this may reflect the fact that females invest more on parental care than males. The sex-dependent parental investment may favor the evolution of different antipredator strategies in males and females: the camouflage in females as a less efficient strategy than vigilance in males. 2017-12-07T04:57:35Z 2017-12-07T04:57:35Z 2011-04 Artigo DINIZ, Pedro. Sex-dependent foraging effort and vigilance in coal-crested finches, Charitospiza eucosma (Aves: Emberizidae) during the breeding season: evidence of female-biased predation?. Zoologia (Curitiba), v. 28, n. 2, p. 165-176, abr. 2011. DOI: https://doi.org/10.1590/S1984-46702011000200003. Disponível em: https://www.scielo.br/j/zool/a/N4T7GSCSyCwx5J6TpjyMXCk/?lang=en#. Acesso em: 7 jan. 2022. http://repositorio.unb.br/handle/10482/28247 https://dx.doi.org/10.1590/S1984-46702011000200003 en Acesso Aberto Zoologia (Curitiba) - This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY NC). Fonte: https://www.scielo.br/j/zool/a/N4T7GSCSyCwx5J6TpjyMXCk/?lang=en#. Acesso em: 07 jan. 2022. application/pdf Sociedade Brasileira de Zoologia
institution REPOSITORIO UNB
collection REPOSITORIO UNB
language English
topic Aves - comportamento
Predação (Biologia)
Sexo (Biologia)
Dimorfismo sexual
spellingShingle Aves - comportamento
Predação (Biologia)
Sexo (Biologia)
Dimorfismo sexual
Alves, Pedro Diniz
Sex-dependent foraging effort and vigilance in coal-crested finches, Charitospiza eucosma (Aves: Emberizidae) during the breeding season: evidence of female-biased predation?
description Sexual dimorphism in birds is often attributed to sexual selection, but another interpretation suggests the evolution of this phenomenon by natural selection. Predation may be an important selective pressure, acting mainly on females. In this study, I tested the latter hypothesis on the coal-crested finch (Charitospiza eucosma Oberholser, 1905) in a neotropical savanna of the Central Brazil (Cerrado). I used capture methods for ascertaining the sex ratio in the population, and focal observations to gather behavioral data. My results show that the sex ratio is skewed toward males (1:1.39). Males were more vigilant, vocalized for longer periods of time, and used higher perches than females. Females foraged more, spent more time on parental care and remained on the ground for longer periods than males. These results support the 'foraging effort hypothesis, suggesting that females are more preyed upon because they spend more time foraging. Ultimately, this may reflect the fact that females invest more on parental care than males. The sex-dependent parental investment may favor the evolution of different antipredator strategies in males and females: the camouflage in females as a less efficient strategy than vigilance in males.
format Artigo
author Alves, Pedro Diniz
author_sort Alves, Pedro Diniz
title Sex-dependent foraging effort and vigilance in coal-crested finches, Charitospiza eucosma (Aves: Emberizidae) during the breeding season: evidence of female-biased predation?
title_short Sex-dependent foraging effort and vigilance in coal-crested finches, Charitospiza eucosma (Aves: Emberizidae) during the breeding season: evidence of female-biased predation?
title_full Sex-dependent foraging effort and vigilance in coal-crested finches, Charitospiza eucosma (Aves: Emberizidae) during the breeding season: evidence of female-biased predation?
title_fullStr Sex-dependent foraging effort and vigilance in coal-crested finches, Charitospiza eucosma (Aves: Emberizidae) during the breeding season: evidence of female-biased predation?
title_full_unstemmed Sex-dependent foraging effort and vigilance in coal-crested finches, Charitospiza eucosma (Aves: Emberizidae) during the breeding season: evidence of female-biased predation?
title_sort sex-dependent foraging effort and vigilance in coal-crested finches, charitospiza eucosma (aves: emberizidae) during the breeding season: evidence of female-biased predation?
publisher Sociedade Brasileira de Zoologia
publishDate 2017
url http://repositorio.unb.br/handle/10482/28247
https://dx.doi.org/10.1590/S1984-46702011000200003
_version_ 1726660465614913536
score 13.657419

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