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Dominance of a Rhizopogon sister species corresponds to forest age structure

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Abstract

Rhizopogon vesiculosus and Rhizopogon vinicolor are sister species of ectomycorrhizal fungi that associate exclusively with Douglas-fir (DF). They form tuberculate mycorrhizas and they can be easily distinguished using molecular tools. We are not aware of studies relating their relative abundance in forests with different age classes. Our objective was to determine whether a change in the number or relative abundance of R. vesiculosus and R. vinicolor tubercules and genotypes was related to a change in the percent of DF in a regenerating phase (<50 years old). R. vesiculosus and R. vinicolor were located by excavating tuberculate mycorrhizas from the forest floor. A DNA Alu1 digest was used to distinguish between the two species. Microsatellite markers were used to identify genotypes. The number of R. vesiculosus tubercules correlated positively with an increasing proportion of DF in a regenerating phase, while the number of R. vinicolor tubercules was similar across all forest age structures. The number of R. vesiculosus genotypes did not correlate with forest age structure, whereas the number of R. vinicolor genotypes showed a negative relationship with an increasing proportion of DF in a regenerating phase. When the numbers of R. vesiculosus tubercules and genotypes were expressed as a relative abundance of the two species, there was a positive correlation with an increasing proportion of DF in a regenerating phase for both genotypes and tubercules. Our results suggest that the degree of DF regeneration or ecosystem factors related to DF regeneration affect the population dynamics of R. vesiculosus and R. vinicolor differently.

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Acknowledgments

The authors would like to acknowledge Suzanne Simard and Jean Mather who helped to select the study plots and Jen Buchanan, Nick Johansen, Scott Hamilton, and Andrea Demoskoff who helped to sample tubercules. We would like to thank Trevor Blenner-Hassett for the assistance with sample mapping and Sheri Maxwell and Mansak Tantikachornkiat for running all of the fragment analysis. We would also like to thank Christopher Hodgkinson for the assistance with data management, Alija Bajro Mujic and Dan Louma for their contributions of their ideas during the writing stage, and Melanie Jones and Suzanne Simard for their comments on the manuscript.

Conflict of interest

The authors declare that they have no competing interests.

Funding

This research was funded by a Natural Sciences and Engineering Research Council of Canada Discovery Grant to Daniel Durall.

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Correspondence to Daniel M. Durall.

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Van Dorp, C.H., Beiler, K.J. & Durall, D.M. Dominance of a Rhizopogon sister species corresponds to forest age structure. Mycorrhiza 26, 169–175 (2016). https://doi.org/10.1007/s00572-015-0660-5

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