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Climate oscillations, glacial refugia, and dispersal ability: factors influencing the genetic structure of the least salmonfly, Pteronarcella badia (Plecoptera), in Western North America

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https://ir.library.oregonstate.edu/concern/articles/jw827d489

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Abstract
  • Background: Phylogeographic studies of aquatic insects provide valuable insights into mechanisms that shape the genetic structure of communities, yet studies that include broad geographic areas are uncommon for this group. We conducted a broad scale phylogeographic analysis of the least salmonfly Pteronarcella badia (Plecoptera) across western North America. We tested hypotheses related to mode of dispersal and the influence of historic climate oscillations on population genetic structure. In order to generate a larger mitochondrial data set, we used 454 sequencing to reconstruct the complete mitochondrial genome in the early stages of the project. Results: Our analysis revealed high levels of population structure with several deeply divergent clades present across the sample area. Evidence from five mitochondrial genes and one nuclear locus identified a potentially cryptic lineage in the Pacific Northwest. Gene flow estimates and geographic clade distributions suggest that overland flight during the winged adult stage is an important dispersal mechanism for this taxon. We found evidence of multiple glacial refugia across the species distribution and signs of secondary contact within and among major clades. Conclusions: This study provides a basis for future studies of aquatic insect phylogeography at the inter-basin scale in western North America. Our findings add to an understanding of the role of historical climate isolations in shaping assemblages of aquatic insects in this region. We identified several geographic areas that may have historical importance for other aquatic organisms with similar distributions and dispersal strategies as P. badia. This work adds to the ever-growing list of studies that highlight the potential of next-generation DNA sequencing in a phylogenetic context to improve molecular data sets from understudied groups.
  • The data set supporting the results of this article are available in GenBank (KU180827-KU182359 and KU182360) and the Dryad repository (doi:10. 5061/ dryad. c1sd4) [62].
  • Keywords: Phylogeography, Stoneflies, Last Glacial Maximum, Cryptic genetic diversity, Next-generation sequencing
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  • Sproul, J. S., Houston, D. D., Nelson, C. R., Evans, R. P., Crandall, K. A., & Shiozawa, D. K. (2015). Climate oscillations, glacial refugia, and dispersal ability: factors influencing the genetic structure of the least salmonfly, Pteronarcella badia (Plecoptera), in Western North America. BMC Evolutionary Biology, 15, 279. doi:10.1186/s12862-015-0553-4
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  • 15
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  • Funding for this project was provided through the Roger and Victoria Sant Educational Endowment for a Sustainable Environment awarded to Dennis K. Shiozawa.
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file details SproulJohnIntegrativeBiologyClimateOscillationsGlacial.pdf 07/25/2017 公开
file details SproulJohnIntegrativeBiologyClimateOscillationsGlacial(Table S1).pdf 07/25/2017 公开