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8 results for “plumage differentiation”
Social and abiotic factors differentially affect plumage ornamentation of young and old males in an Australian songbird
<p>Both abiotic environmental conditions and variation in social environment are known to impact the acquisition of sexual signals. However, the influences of abiotic environmental and social factors are rarely compared to each other. Here we test the relative importance of these factors in determining whether and when male red-backed fairywrens (<i>Malurus melanocephalus</i>) moult into a known sexual signal, ornamented breeding plumage. One-year-old male red-backed fairywrens vary in whether or not they acquire ornamentation, whereas males age two and older vary in their timing of ornament acquisition. It is unclear whether these processes are determined by the same or different factors and we examine both events using a combination of long-term breeding records and non-breeding social networks. We found that one-year-old males that paired prior to the start of the breeding season were more likely to acquire ornamented plumage, but rainfall did not influence whether one-year-old males acquired ornamented plumage. Thus, for young individuals, social cues appear to play a larger role than abiotic environmental factors in determining ornament acquisition. For older males, timing of ornamented plumage acquisition was constrained by rainfall, with drier non-breeding seasons leading to poorer physiological condition and later moult dates. Thus, sexual signal variation in older males appears to be a condition-dependent trait, driven by abiotic environmental and physiological factors rather than social cues. These findings reveal that factors influencing sexual signal expression can vary with age when age classes exhibit different forms of signal variation. Our results suggest that social environment may drive sexual signal variation in young individuals, whereas abiotic environmental variation may drive sexual signal variation in older individuals.</p>
Social and abiotic factors differentially affect plumage ornamentation of young and old males in an Australian songbird
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Differential effects of foraging strategies on carotenoid-derived plumage color and individual quality in stripe-tailed yellow finches
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Data from: Selection on a single locus drives plumage differentiation in the Rufous-collared Sparrow (Zonotrichia capensis)
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Discordance among nuclear, mitochondrial, plumage, and vocal differentiation in the <em>Dysithamnus mentalis</em> (Plain Antvireo) complex
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Data from: Sustained plumage divergence despite weak genomic differentiation and broad sympatry in sister species of Australian woodswallows (Artamus spp.)
<p><span>Plumage divergence can function as a strong premating barrier when species come into secondary contact. When it fails to do so, the results are often genome homogenization and phenotypic hybrids at the zone of contact. This is not the case in the largely sympatric masked woodswallow and white-browed woodswallow species (Passeriformes: Artamidae: Artamus spp) complex in Australia where phenotypic integrity is sustained despite no discernible mitochondrial structure in earlier work. This lack of structure may suggest recent divergence, ongoing gene flow or both, and phenotypic hybrids are reported albeit rarely. Here, we further assessed the population structure and differentiation across the species' nuclear genomes using ddRAD-seq. As found in the mitochondrial genome, no structure or divergence within or between the two species was detected in the nuclear genome. This coarse sampling of the genome nonetheless revealed peaks of differentiation around the genes SOX5 and Axin1. Both are involved in the Wnt/β-catenin signaling pathway, which regulates feather development. Reconstruction of demographic history and estimation of parameters supports a scenario of secondary contact. Our study informs how divergent plumage morphs may arise and be sustained despite whole-genome homogenization and reveals new candidate genes potentially involved in plumage divergence.</span></p>
Data from: Differentially expressed genes match bill morphology and plumage despite largely homogenous genomes in a Holarctic songbird
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Data from: Sustained plumage divergence despite weak genomic differentiation and broad sympatry in sister species of Australian woodswallows (Artamus spp.)
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