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10 results for “Zonotrichia leucophrys”
Machine learning reveals that climate, geography, and cultural drift all predict bird song variation in coastal Zonotrichia leucophrys
<p>Previous work has demonstrated that there is extensive variation in the songs of White-crowned Sparrow (<em>Zonotrichia leucophrys</em>) throughout the species range, including between neighboring (and genetically distinct) subspecies <em>Z. l. nuttalli </em>and <em>Z. l. pugetensis</em>. Using a machine learning approach to bioacoustic analysis, we demonstrate that variation in song is correlated with year of recording (representing cultural drift), geographic distance, and climatic differences, but the response is subspecies- and season-specific. Automated machine learning methods of bird song annotation can process large datasets more efficiently, allowing us to examine 1,913 recordings across ~60 years. We utilize a recently published artificial neural network to automatically annotate White-crowned Sparrow vocalizations. By analyzing differences in syllable usage and composition, we recapitulate the known pattern where <em>Z. l. nuttalli </em>and <em>Z. l. pugetensis </em>have significantly different songs. Our results are consistent with the interpretation that these differences are caused by the changes in characteristics of syllables in the White-crowned Sparrow repertoire. This supports the hypothesis that the evolution of vocalization behavior is affected by the environment, in addition to population structure.</p>
Machine learning reveals that climate, geography, and cultural drift all predict bird song variation in coastal Zonotrichia leucophrys
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Data from: Behavioral response to song and genetic divergence in two subspecies of white-crowned sparrows (Zonotrichia leucophrys)
Divergence in sexual signals may drive reproductive isolation between lineages, but behavioral barriers can weaken in contact zones. Here, we investigate the role of song as a behavioral and genetic barrier in a contact zone between two subspecies of white-crowned sparrows (Zonotrichia leucophrys). We employed a reduced genomic dataset to assess population structure and infer the history underlying divergence, gene flow and hybridization. We also measured divergence in song and tested behavioral responses to song using playback experiments within and outside the contact zone. We found that the subspecies form distinct genetic clusters, and demographic inference supported a model of secondary contact. Song phenotype, particularly length of the first note (a whistle), was a significant predictor of genetic subspecies identity and genetic distance along the hybrid zone, suggesting a close link between song and genetic divergence in this system. Individuals from both parental and admixed localities responded significantly more strongly to their own song than to the other subspecies song, supporting song as a behavioral barrier. Putative parental and admixed individuals were not significantly different in their strength of discrimination between own and other songs; however, individuals from admixed localities tended to discriminate less strongly, and this difference in discrimination strength was explained by song dissimilarity as well as genetic distance. Therefore, we find that song acts as a reproductive isolating mechanism that is potentially weakening in a contact zone between the subspecies. Our findings also support the hypothesis that intra-specific song variation can reduce gene flow between populations.
Song and genetic divergence within a subspecies of white-crowned sparrow (Zonotrichia leucophrys nuttalli)
<p><span>Animal culture evolves alongside </span><span>genomes</span><span>, and</span><span> the two modes of inheritance—culture and genes—interact in myriad ways.</span> <span>For example,</span><span> stable geographic variation </span><span>in culture can act as </span><span>a </span><span>reproductive barrier</span><span>, </span><span>thereby producing genetic divergence</span><span> between "cultural populations</span><span>.</span><span>"</span> <span>White-crowned sparrows (</span><span>Zonotrichia</span> <span>leucophrys</span><span>) are a </span><span>well-established</span><span> model species for bird song</span><span> learning</span><span> and cultural evolution</span><span>, as t</span><span>hey </span><span>have </span><span>distinct</span><span>, </span><span>geographically </span><span>discrete</span><span>, and culturally transmitted</span> <span>song </span><span>types</span><span> (i.e., song dialects)</span><span>. </span><span>In this study, we tested </span><span>the hypothesis that</span> <span>divergence between </span><span>culturally transmitted </span><span>songs </span><span>drive</span><span>s</span> <span>genetic divergence</span> <span>with</span><span>in Nuttall's white-crowned sparrows (</span><span>Z. l. </span><span>nuttalli</span><span>).</span><span> In accordance with sexual selection theory, we hypothesized that cultural divergence between mating signals both preceded and generated genetic divergence.</span><span>We characterized the population structure and song variation in the subspecies and found two </span><span>genetic</span><span>ally differentiated</span> <span>populations </span><span>whose</span><span> boundary</span> <span>coincid</span><span>es</span><span> with a major </span><span>song </span><span>boundary</span><span> at Monterey Bay</span><span>, California</span><span>.</span> <span>We then</span><span> conducted a song playback experiment </span><span>that </span><span>demonstrated males discriminate between songs based on their degree of divergence from the</span><span>ir</span><span> local dialect</span><span>. These results</span> <span>support</span><span> the idea that discrimination against non-local songs</span><span> is driving genetic divergence between the northern and southern populations. </span><span>Altogether, t</span><span>his</span><span> study</span><span> provides evidence that</span><span> cultura</span><span>lly transmitted bird songs can act as the foundation for speciation by sexual selection</span><span>.</span></p>
Data from: Behavioral response to song and genetic divergence in two subspecies of white-crowned sparrows (Zonotrichia leucophrys)
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Song and genetic divergence within a subspecies of white-crowned sparrow (Zonotrichia leucophrys nuttalli)
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Mitochondrial remodeling supports migration in White-crowned Sparrows (Zonotrichia leucophrys)
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Data from: Altered expression of pectoral myosin heavy chain isoforms corresponds to migration status in the white-crowned sparrow (Zonotrichia leucophrys gambelii)
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Microsatellite genotyping data for habitat-linked genetic structure for white-crowned sparrow (Zonotrichia leucophrys): local factors shape population genetic structure
<p>Ecological, environmental, and geographic factors all influence genetic structure. Species with broad distributions are ideal systems because they cover a range of ecological and environmental conditions allowing us to test which components predict genetic structure. This study presents a novel, broad geographic approach using molecular markers, morphology, and habitat modelling to investigate rangewide and local barriers causing contemporary genetic differentiation within the geographical range of three white-crowned sparrow (<i>Zonotrichia leucophrys</i>) subspecies: <i>Z. l. gambelii, Z. l. oriantha, </i>and <i>Z. l. pugetensis</i>. Three types of genetic markers showed geographic distance between sampling sites, elevation, and ecosystem type are key factors contributing to population genetic structure. Microsatellite markers revealed white-crowned<i> </i>sparrows<i> </i>do not group by subspecies, but instead indicated four groupings at a rangewide scale and two groupings based on coniferous and deciduous ecosystems at a local scale. Our analyses of morphological variation also revealed habitat differences; sparrows from deciduous ecosystems are larger than individuals from coniferous ecosystems based on principal component analyses. Habitat modeling showed isolation by distance was prevalent in describing genetic structure, but isolation by resistance also had a small but significant influence. Not only do these findings have implications concerning the accuracy of subspecies delineations, they also highlight the critical role of local factors such as habitat in shaping contemporary population genetic structure of species with high dispersal ability.</p>
Microsatellite genotyping data for habitat-linked genetic structure for white-crowned sparrow (Zonotrichia leucophrys): local factors shape population genetic structure
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