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    Contrasting patterns of local adaptation along climatic gradients between a sympatric parasitic and autotrophic tree species

    87287.pdf (1.423Mb)
    Access Status
    Open access
    Authors
    Walters, S.J.
    Robinson, Todd
    Byrne, M.
    Wardell-Johnson, Grant
    Nevill, Paul
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Walters, S.J. and Robinson, T.P. and Byrne, M. and Wardell-Johnson, G.W. and Nevill, P. 2020. Contrasting patterns of local adaptation along climatic gradients between a sympatric parasitic and autotrophic tree species. Molecular Ecology. 29 (16): pp. 3022-3037.
    Source Title
    Molecular Ecology
    DOI
    10.1111/mec.15537
    ISSN
    0962-1083
    Faculty
    Faculty of Science and Engineering
    School
    School of Earth and Planetary Sciences (EPS)
    School of Molecular and Life Sciences (MLS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/IC150100041
    Remarks

    This is the peer reviewed version of the following article: Walters, SJ, Robinson, TP, Byrne, M, Wardell-Johnson, GW, Nevill, P. Contrasting patterns of local adaptation along climatic gradients between a sympatric parasitic and autotrophic tree species. Mol Ecol. 2020; 29: 3022– 3037, which has been published in final form at https://doi.org/10.1111/mec.15537. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.

    URI
    http://hdl.handle.net/20.500.11937/87447
    Collection
    • Curtin Research Publications
    Abstract

    Sympatric tree species are subject to similar climatic drivers, posing a question as to whether they display comparable adaptive responses. However, no study has explicitly examined local adaptation of co-occurring parasitic and autotrophic plant species to the abiotic environment. Here we test the hypotheses that a generalist parasitic tree would display a weaker signal of selection and that genomic variation would associate with fewer climatic variables (particularly precipitation) but have similar spatial patterns to a sympatric autotrophic tree species. To test these hypotheses, we collected samples from 17 sites across the range of two tree species, the hemiparasite Nuytsia floribunda (n = 264) and sympatric autotroph Melaleuca rhaphiophylla (n = 272). We obtained 5,531 high-quality genome-wide single nucleotide polymorphisms (SNPs) for M. rhaphiophylla and 6,727 SNPs for N. floribunda using DArTseq genome scan technology. Population differentiation and environmental association approaches were used to identify signals of selection. Generalized dissimilarly modelling was used to detect climatic and spatial patterns of local adaptation across climatic gradients. Overall, 322 SNPs were identified as putatively adaptive for the autotroph, while only 57 SNPs were identified for the parasitic species. We found genomic variation to associate with different sets of bioclimatic variables for each species, with precipitation relatively less important for the parasite. Spatial patterns of predicted adaptive variability were different and indicate that co-occurring species with disparate life history traits may not respond equally to selective pressures (i.e., temperature and precipitation). Together, these findings provide insight into local adaptation of sympatric parasitic and autotrophic tree species to abiotic environments.

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