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Resolving neutral and deterministic contributions to genomic structure in Syntrichia ruralis (Bryophyta, Pottiaceae) informs propagule sourcing for dryland restoration

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Abstract

Syntrichia ruralis is a cosmopolitan moss that occupies steep environmental gradients. In arid to semi-arid regions of the world it is a key component of biological soil crusts, which are fundamental to healthy dryland ecosystem processes. As such, S. ruralis has attracted the attention of conservationists seeking to restore degraded biological soil crust communities and their associated vascular flora. Here, we generate genomic data for S. ruralis populations that span climatic gradients across the Colorado Plateau of the southwestern USA to investigate the contributions of neutral and deterministic processes to the partitioning of genomic structure. Although S. ruralis appears to be highly dispersible, geographic proximity significantly predicts genomic similarity. In addition, even when taking into account apparently high migration rates among populations and spatial autocorrelation of allele frequencies, some genomic variation is explained by environmental gradients correlated with elevation and latitude. Consequently, efforts to restore dryland ecosystems by establishing S. ruralis as a foundation should include strategies to ensure that propagule sources of this moss are environmentally stratified and targeted to the current/future climates of restoration sites.

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Acknowledgements

The authors are grateful for the support and helpful advice of their colleagues, including E. Milano for assistance with next-generation sequencing, M. Bowker for moss expertise, and J. Belnap and two anonymous reviewers for comments that improved the quality of this manuscript. This work was funded by the Bureau of Land Management’s Colorado Plateau Native Plant Program. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

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  1. Southwest Biological Science Center, U.S. Geological Survey, Flagstaff, AZ, 86001, USA

    Rob Massatti

  2. School of Forestry, Northern Arizona University, 200 East Pine Knoll Drive, Flagstaff, AZ, 86011, USA

    Kyle D. Doherty

  3. 507 E. Charles Road, Flagstaff, AZ, 86001, USA

    Troy E. Wood

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  1. Rob Massatti
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Massatti, R., Doherty, K.D. & Wood, T.E. Resolving neutral and deterministic contributions to genomic structure in Syntrichia ruralis (Bryophyta, Pottiaceae) informs propagule sourcing for dryland restoration. Conserv Genet 19, 85–97 (2018). https://doi.org/10.1007/s10592-017-1026-7

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