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Clark MI, Bradburd GS, Akopyan M, et al. Genetic isolation by distance underlies color pattern divergence in red-eyed treefrogs (Agalychnis callidryas). Mol Ecol. 2022;doi: 10.1111/mec.16350.
Clark, M. I., Bradburd, G. S., Akopyan, M., Vega, A., Rosenblum, E. B., & Robertson, J. M. (2022). Genetic isolation by distance underlies color pattern divergence in red-eyed treefrogs (Agalychnis callidryas). Molecular ecology, . https://doi.org/10.1111/mec.16350
Clark, Meaghan I, et al. "Genetic isolation by distance underlies color pattern divergence in red-eyed treefrogs (Agalychnis callidryas)." Molecular ecology vol. (2022). doi: https://doi.org/10.1111/mec.16350
Clark MI, Bradburd GS, Akopyan M, Vega A, Rosenblum EB, Robertson JM. Genetic isolation by distance underlies color pattern divergence in red-eyed treefrogs (Agalychnis callidryas). Mol Ecol. 2022 Jan 16; doi: 10.1111/mec.16350. Epub 2022 Jan 16. PMID: 35034406.
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Mol Ecol. 2022 Jan 16; doi: 10.1111/mec.16350. Epub 2022 Jan 16.

Genetic isolation by distance underlies color pattern divergence in red-eyed treefrogs (Agalychnis callidryas).

Molecular ecology

Meaghan I Clark, Gideon S Bradburd, Maria Akopyan, Andres Vega, Erica Bree Rosenblum, Jeanne M Robertson

Affiliations

  1. Department of Biology, California State University Northridge, Northridge, CA, USA.
  2. Department of Integrative Biology, Ecology, Evolution and Behavior Group, Michigan State University, East Lansing.
  3. W.K. Kellogg Biological Station, Michigan State University, Hickory Corners, MI, USA.
  4. Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, USA.
  5. AMBICOR, Tibas, Costa Rica.
  6. Department of Environmental Science, Policy, and Management, University of California Berkeley, Berkeley, CA, USA.
  7. Museum of Vertebrate Zoology, University of California Berkeley, Berkeley, CA, USA.
  8. Department of Herpetology, Natural History Museum of Los Angeles County, Los Angeles, CA, USA.

PMID: 35034406 DOI: 10.1111/mec.16350

Abstract

Investigating the spatial distribution of genetic and phenotypic variation can provide insights into the evolutionary processes that shape diversity in natural systems. We characterized patterns of genetic and phenotypic diversity to learn about drivers of color-pattern diversification in red-eyed treefrogs (Agalychnis callidryas) in Costa Rica. Along the Pacific coast, red-eyed treefrogs have conspicuous leg color patterning that transitions from orange in the north to purple in the south. We measured phenotypic variation of frogs, with increased sampling at sites where the orange-to-purple transition occurs. At the transition zone, we discovered the co-occurrence of multiple color-pattern morphs. To explore possible causes of this variation, we generated a SNP dataset to analyze population genetic structure, measure genetic diversity, and infer the processes that mediate genotype-phenotype dynamics. We investigated how patterns of genetic relatedness correspond with individual measures of color pattern along the coast, including testing for the role of hybridization in geographic regions where orange and purple phenotypic groups co-occur. We found no evidence that color-pattern polymorphism in the transition zone arose through recent hybridization. Instead, a strong pattern of genetic isolation by distance (IBD) indicates that color-pattern variation was either retained through other processes such as ancestral color polymorphisms or ancient secondary contact, or else it was generated by novel mutations. We found that phenotype changes along the Pacific coast more than would be expected based on genetic divergence and geographic distance alone. Combined, our results suggest the possibility of selective pressures acting on color pattern at a small geographic scale.

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Keywords: Costa Rica; Population genetics; color-pattern polymorphism; hybridization

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