Mycologia
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DOI: 10.3852/mycologia.98.2.250
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Mycologia, 98(2), 2006, pp. 250-259.
© 2006 by The Mycological Society of America

Spatial analysis of within-population microsatellite variability reveals restricted gene flow in the Pacific golden chanterelle (Cantharellus formosus)


Susie M. Dunham 1

     Oregon State University, Department of Forest Science, 3200 SW Jefferson Way, Corvallis, Oregon 97331

Thomas E. O’Dell 2

     USDA Forest Service, Pacific Northwest Research Station, 3200 Jefferson Way, Corvallis, Oregon 97331

Randy Molina

     USDA Forest Service, Pacific Northwest Research Station, 620 SW Main, Suite 400, Portland, Oregon

We examined the within-population genetic structure of the Pacific golden chanterelle (Cantharellus formosus) in a 50 y old forest stand dominated by Douglas-fir (Pseudotsuga menziesii) and western hemlock (Tsuga heterophylla) with spatial autocorrelation analysis. We tested the null hypothesis that multilocus genotypes possessed by chanterelle genets were randomly distributed within the study area. Fruit bodies from 203 C. formosus genets were collected from a 50 ha study plot. One hundred six unique multilocus genotypes were identified after scoring these collections at five microsatellite loci. Statistically significant positive spatial autocorrelation was detected indicating the presence of fine-scale genetic structure within the area. Repeated autocorrelation analyses with varied minimum distance classes (50–500 m) detected positive spatial genetic structure up to 400 m. Therefore nonrandom evolutionary processes (e.g., isolation by distance) can cause fine-scale genetic structure in C. formosus. The implications of this research for future broad-scale population studies of this species are that population samples should be separated by at least 400 m to be considered statistically independent. Sampling designs that account for fine-scale genetic structure will better characterize heterogeneity distributed across the landscape by avoiding the effects of pseudo replication.

Key words: correlogram, Ectomycorrhizal, fungi, genetic structure, spatial autocorrelation

1 Corresponding author. Current address: Department of Botany and Plant Pathology, 2082 Cordley Hall, Oregon State University, Corvallis, OR 97331. E-mail: dunhams{at}science.oregonstate.edu






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Copyright © 2006 by The Mycological Society of America.