Carotenoid‐Based Plumage Coloration Predicts Leukocyte Parameters during the Breeding Season in Northern Cardinals (<i>Cardinalis cardinalis</i>)

Maney, Donna L.; Davis, Andrew K.; Goode, Christopher T.; Reid, Allison; Showalter, Christopher

doi:10.1111/j.1439-0310.2008.01476.x

Cited by 24 publications

(26 citation statements)

References 93 publications

(238 reference statements)

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“…Blood smears were stained using Diff-Quik Stain Set (Dade Behring, Newark, DE). Heterophils and lymphocytes were counted under oil immersion at 1,000# magnification until 100 leukocytes were identified or 150 fields of a homogenous monolayer of cells had been examined, whichever came first, following Maney et al (2008). Because smears were of varying quality, all blood smears were initially ranked blindly (by R.J.K.)…”

Section: H : L Ratiomentioning

confidence: 99%

“…Female ornaments have been found to signal immune function (but see Pärn et al 2005), yet most studies on females have focused on species in which ornamental expression is limited to or more pronounced in females (Roulin et al 2001a(Roulin et al , 2001bHanssen et al 2006). In contrast, few studies have examined whether ornaments shared by the sexes signal the same or different aspects of immunity or physiological condition (but see Alvarez et al 2005;Lopez et al 2008;Maney et al 2008). The observation that males and females of a species often differ in immunocompetence (e.g., Nunn et al 2009;Pap et al 2010) raises the question of whether ornamentation shared by the sexes reflects immune function in the same way in both sexes.…”

Section: Introductionmentioning

confidence: 99%

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Carotenoid-Based Ornaments of Female and Male American Goldfinches (Spinus tristis) Show Sex-Specific Correlations with Immune Function and Metabolic Rate

Kelly¹,

Murphy²,

Tarvin³

et al. 2012

Physiological and Biochemical Zoology

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Conspicuous ornamentation has been linked to immunological and physiological condition in males of many species. In species where both sexes are ornamented, it is unclear whether the signal content of ornaments differs between males and females. We examined the immunological and physiological correlates of carotenoid-based bill and plumage ornamentation in American goldfinches Spinus tristis, a species in which bright orange bills are sexually monomorphic but yellow plumage is sexually dimorphic during the breeding season. Because bill color is dynamic over short periods while plumage color is static over longer time frames, we tested whether these signals have the potential to provide temporal information about immunity and condition. In both sexes, bill color (but not plumage color) was negatively related to leukocyte differential, a measure of recent stress, while plumage color (but not bill color) was positively related to resting metabolic rate. In females, bill color also positively correlated with immunoglobulin Y, a component of acquired immunity, while plumage color positively predicted natural antibody levels, a component of innate immunity. In males, neither bill color nor plumage color predicted immune function, suggesting that the mechanisms underlying these signals vary with sex. Our results demonstrate that dynamic signals such as bill coloration do not merely reflect the same information provided by static signals but that these two classes of signal provide information about different temporal aspects of phenotypic quality. Furthermore, our results indicate that a signal expressed in both sexes has the potential to provide different information depending on the sex of the bearer.

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Section: H : L Ratiomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Carotenoid-Based Ornaments of Female and Male American Goldfinches (Spinus tristis) Show Sex-Specific Correlations with Immune Function and Metabolic Rate

Kelly¹,

Murphy²,

Tarvin³

et al. 2012

Physiological and Biochemical Zoology

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“…Maney et al 2008) and survival (Cabezas et al 2007). In Black Grouse, the H/L ratio was highly variable among individuals and the variation among captures of the same individual was smaller than the variation among individuals.…”

Section: Discussionmentioning

confidence: 97%

“…Such a relationship between stress response and the H/L ratio makes variations in the leukocyte profile very useful for quantifying individual stress levels in birds and measuring the fitness consequences of the stress response (e.g. Dufva and Allander 1995;Birkhead et al 1998;Hõrak et al 1998;Figuerola et al 1999;Møller and Petrie 2002;Moreno et al 2002;Ilmonen et al 2003;Saks et al 2003;Garamszegi et al 2006;Ochs and Dawson 2008;Maney et al 2008). These studies have highlighted the potential for the stress response to mediate sexual selection, and therefore variations in fitness among individuals.…”

Section: Introductionmentioning

confidence: 99%

Leucocyte counts variation and measures of male fitness in the lekking Black Grouse

et al. 2011

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Differences in the ability to sustain chronic stress can underlie the variation in individuals' fitness directly or indirectly by impairing the expression of condition-dependent signals used in female mate choice. Therefore, understanding the effect of the stress response on individuals' fitness is key to identifying the mechanism of sexual selection. We tested the hypothesis that an indicator of stress-the heterophil/lymphocyte ratio (H/L ratio)-is related to several major components of male fitness in the lekking Black Grouse (Tetrao tetrix), a species with intense male-male competition. The H/L ratio accurately measured the stress response, as it increased within a few hours of trapping and during the months prior to the mating season. The H/L ratio was positively related to the expression of morphological traits, suggesting that males of higher ''quality'' might be able to express elaborated ornaments and better cope with stressful conditions or with changes in health status. However, in Black Grouse, ornaments are (partly) independent of behavioural display and are under only weak selective pressure. Therefore, the H/L ratio was not significantly related to male mating success and survival to the following year. Under natural conditions, observed levels of the H/L ratio might not be associated with strongly deleterious effects because of behavioural adjustments. Mechanisms other than the stress response may mediate the observed variance in male mating success.

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“…Hõrak et al 2001), immune function (e.g. Maney et al 2008) or parental effort (e.g. Keyser and Hill 2000;Siefferman and Hill 2003).…”

Section: Introductionmentioning

confidence: 99%

Male achromatic wing colouration is related to body condition and female reproductive investment in a dichromatic species, the upland goose

Gladbach

Quillfeldt

2010

J Ethol

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In many bird species, achromatic plumage patch size can serve as a male status signal, but the use of variations in the achromatic colours themselves as a quality signal has only recently come into focus. In our study, we sought to determine whether achromatic plumage reflects individual quality in the upland goose (Chloephaga picta leucoptera). We examined the relationship between male head and wing reflectance, male condition and female reproductive investment. We found that males with darker specula and greater contrast between the white wing coverts and the speculum were in a better body condition. Variations in the brightness of the white plumage were not a quality signal in the upland goose. The information gleaned from the wing colouration of male upland geese could be used during mate selection, when females choose their mate on the basis of the outcomes of aggressive encounters. During these fights, the males expose their white coverts and their specula, which are normally tucked beneath body feathers.

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Carotenoid‐Based Plumage Coloration Predicts Leukocyte Parameters during the Breeding Season in Northern Cardinals (Cardinalis cardinalis)

Cited by 24 publications

References 93 publications

Carotenoid-Based Ornaments of Female and Male American Goldfinches (Spinus tristis) Show Sex-Specific Correlations with Immune Function and Metabolic Rate

Carotenoid-Based Ornaments of Female and Male American Goldfinches (Spinus tristis) Show Sex-Specific Correlations with Immune Function and Metabolic Rate

Leucocyte counts variation and measures of male fitness in the lekking Black Grouse

Male achromatic wing colouration is related to body condition and female reproductive investment in a dichromatic species, the upland goose

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