期刊
JOURNAL OF ANIMAL ECOLOGY
卷 90, 期 1, 页码 197-211出版社
WILEY
DOI: 10.1111/1365-2656.13314
关键词
gene flow; hybridization; kin structure; network rewiring; parentage analysis; phenotypic assortment; reproductive barriers; social network dynamics
资金
- University of Colorado, Department of Ecology & Evolutionary Biology Graduate Student Research Grant
- University of Colorado
- Sea & Sage Audubon Society
- Animal Behavior Society
- Anza Borrego Foundation
- American Ornithologists' Union
- Pasadena Audubon Society
- American Museum of Natural History
- Achievement Rewards for College Scientists Foundation
- Society for the Study of Evolution
- American Society of Naturalists
- Wilson Ornithological Society
- University of Colorado Museum of Natural History Graduate Research Grant
Social networks within hybrid populations play a key role in understanding the dynamics of relationships between individuals during the breeding season, and how this influences the exchange of genes within these populations. The study found that rewiring of associations between individuals drives more changes in network structure than individual turnover, and that the strength of associations within the social network, rather than genetic relatedness, predicts patterns of parentage.
Mating behaviour and the timing of reproduction can inhibit genetic exchange between closely related species; however, these reproductive barriers are challenging to measure within natural populations. Social network analysis provides promising tools for studying the social context of hybridization, and the exchange of genetic variation, more generally. We test how social networks within a hybrid population of CaliforniaCallipepla californicaand Gambel's quailCallipepla gambeliichange over discrete periods of a breeding season. We assess patterns of phenotypic and genotypic assortment, and ask whether altered associations between individuals (association rewiring), or changes to the composition of the population (individual turnover) drive network dynamics. We use genetic data to test whether social associations and relatedness between individuals correlate with patterns of parentage within the hybrid population. To achieve these aims, we combine RFID association data, phenotypic data and genomic measures with social network analyses. We adopt methods from the ecological network literature to quantify shifts in network structure and to partition changes into those due to individual turnover and association rewiring. We integrate genomic data into networks as node-level attributes (ancestry) and edges (relatedness, parentage) to test links between social and parentage networks. We show that rewiring of associations between individuals that persist across network periods, rather than individual turnover, drives the majority of the changes in network structure throughout the breeding season, and that the traits involved in phenotypic/genotypic assortment were highly dynamic over time. Social networks were randomly assorted based on genetic ancestry, suggesting weak behavioural reproductive isolation within this hybrid population. Finally, we show that the strength of associations within the social network, but not levels of genetic relatedness, predicts patterns of parentage. Social networks play an important role in population processes such as the transmission of disease and information, yet there has been less focus on how networks influence the exchange of genetic variation. By integrating analyses of social structure, phenotypic assortment and reproductive outcomes within a hybrid zone, we demonstrate the utility of social networks for analysing links between social context and gene flow within wild populations.
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