Brightness of melanin-based plumage coloration is a cue to oxidative stress in Himalayan Black Bulbuls (Hypsipetes leucocephalus nigerrimus)

Hsin Yi Hung, Shou Hsien Li

研究成果: 雜誌貢獻文章

3 引文 (Scopus)

摘要

Background: Melanin-based coloration is often found to be associated with variations in physiological and behavioral traits that are essential in avian communication. However, the function of melanin-based traits to their bearers has been investigated less than that of carotenoid-based ones. It is commonly believed that expression of melanin-based pigmentation is genetically controlled. However, whether it could be modulated by physical condition has remained controversial. In this study, we demonstrate that the level of melanin-based plumage pigmentation could be negatively correlated with an individual's oxidative stress level. Methods: In this study, we used two groups of Black Bulbuls (Hypsipetes leucocephalus nigerrimus) obtained from a pet-shop in 2010 and 2011 to examine the correlation between the melanin-based plumage coloration and the ratio of lymphocytes to heterocytes, which is an indicator of the oxidative stress experienced by an individual. Results: We found a negative correlation between oxidative stress levels and expression of melanin-based pigmentation on the breast and scapular feathers, but the correlation only appeared in the 2011 group, individuals of which had higher oxidative stress level and brighter plumage (i.e. more melanins) than those of the 2010 group. Conclusions: Our data suggest that melanin-based plumage could reflect an individual's physical condition in certain situations. Therefore, melanin-based plumage coloration could have a function in Himalayan Black Bulbuls' communication.

原文英語
文章編號26
期刊Avian Research
6
發行號1
DOIs
出版狀態已發佈 - 2015 十二月 23

指紋

melanin
plumage
oxidative stress
color
pigmentation
animal communication
communication
Pycnonotidae
feather
carotenoid
feathers
pets
breasts
carotenoids
lymphocytes

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

引用此文

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abstract = "Background: Melanin-based coloration is often found to be associated with variations in physiological and behavioral traits that are essential in avian communication. However, the function of melanin-based traits to their bearers has been investigated less than that of carotenoid-based ones. It is commonly believed that expression of melanin-based pigmentation is genetically controlled. However, whether it could be modulated by physical condition has remained controversial. In this study, we demonstrate that the level of melanin-based plumage pigmentation could be negatively correlated with an individual's oxidative stress level. Methods: In this study, we used two groups of Black Bulbuls (Hypsipetes leucocephalus nigerrimus) obtained from a pet-shop in 2010 and 2011 to examine the correlation between the melanin-based plumage coloration and the ratio of lymphocytes to heterocytes, which is an indicator of the oxidative stress experienced by an individual. Results: We found a negative correlation between oxidative stress levels and expression of melanin-based pigmentation on the breast and scapular feathers, but the correlation only appeared in the 2011 group, individuals of which had higher oxidative stress level and brighter plumage (i.e. more melanins) than those of the 2010 group. Conclusions: Our data suggest that melanin-based plumage could reflect an individual's physical condition in certain situations. Therefore, melanin-based plumage coloration could have a function in Himalayan Black Bulbuls' communication.",
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N2 - Background: Melanin-based coloration is often found to be associated with variations in physiological and behavioral traits that are essential in avian communication. However, the function of melanin-based traits to their bearers has been investigated less than that of carotenoid-based ones. It is commonly believed that expression of melanin-based pigmentation is genetically controlled. However, whether it could be modulated by physical condition has remained controversial. In this study, we demonstrate that the level of melanin-based plumage pigmentation could be negatively correlated with an individual's oxidative stress level. Methods: In this study, we used two groups of Black Bulbuls (Hypsipetes leucocephalus nigerrimus) obtained from a pet-shop in 2010 and 2011 to examine the correlation between the melanin-based plumage coloration and the ratio of lymphocytes to heterocytes, which is an indicator of the oxidative stress experienced by an individual. Results: We found a negative correlation between oxidative stress levels and expression of melanin-based pigmentation on the breast and scapular feathers, but the correlation only appeared in the 2011 group, individuals of which had higher oxidative stress level and brighter plumage (i.e. more melanins) than those of the 2010 group. Conclusions: Our data suggest that melanin-based plumage could reflect an individual's physical condition in certain situations. Therefore, melanin-based plumage coloration could have a function in Himalayan Black Bulbuls' communication.

AB - Background: Melanin-based coloration is often found to be associated with variations in physiological and behavioral traits that are essential in avian communication. However, the function of melanin-based traits to their bearers has been investigated less than that of carotenoid-based ones. It is commonly believed that expression of melanin-based pigmentation is genetically controlled. However, whether it could be modulated by physical condition has remained controversial. In this study, we demonstrate that the level of melanin-based plumage pigmentation could be negatively correlated with an individual's oxidative stress level. Methods: In this study, we used two groups of Black Bulbuls (Hypsipetes leucocephalus nigerrimus) obtained from a pet-shop in 2010 and 2011 to examine the correlation between the melanin-based plumage coloration and the ratio of lymphocytes to heterocytes, which is an indicator of the oxidative stress experienced by an individual. Results: We found a negative correlation between oxidative stress levels and expression of melanin-based pigmentation on the breast and scapular feathers, but the correlation only appeared in the 2011 group, individuals of which had higher oxidative stress level and brighter plumage (i.e. more melanins) than those of the 2010 group. Conclusions: Our data suggest that melanin-based plumage could reflect an individual's physical condition in certain situations. Therefore, melanin-based plumage coloration could have a function in Himalayan Black Bulbuls' communication.

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