Spatial and temporal population dynamics of Cantharellus formosus, the Pacific Golden chanterelle, in Oregon Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6m311r21c

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  • This dissertation was undertaken to improve the understanding of the population dynamics of the Pacific Golden chanterelle, Cantharellus formosus. It addresses the longevity of individuals over a 12 year period and the limits of gene flow within the area of a 6,400 hectare watershed at the H.J. Andrews Long Term Ecological Research site and the 112 km square Willamette Valley of Oregon. I found that certain genets (i.e. genotypic individuals), called predominant genets, were able to survive for many years and inhabited an area of approximately 4 meters in diameter. Predominant genets produced sporocarps nearly every year, but many related and unrelated genets appeared and disappeared within the boundaries of that genet (as measured by sporocarps), especially in abundant or "good" years of sporocarp production. There was very little differentiation found between 9 plots in the the 6,400 hectare watershed (FST=0.001-0.008). Most differentiation was driven by one or two plots that differed in each of the years sampled (1998, 2000). Migration rates and genetic diversity also differed within the two years sampled. These results demonstrate the differences that occur between abundant years, when many different genets produce a single sporocarp, and less abundant years, when only the predominant genets produce sporocarps. The trend of little differentiation continued at the larger scale when the Willamette Valley was tested as a barrier to dispersal. I found no barrier to dispersal between the Coast Mountain Range and the Cascade Mountain Range that border the Willamette Valley. The two northernmost populations on the Coast Range showed somewhat larger differentiation, as did parameters between populations when evaluated by region. Analysis of molecular variance partitioned nearly twice the amount of variance to regions when calculated by genotypic frequencies (11%) as opposed to allelic frequencies (6%). This suggests that there is a tendency for genetic exchange between close populations. Differentiation was not supported by low estimated migration rates. These findings support a heirarchical dispersal scenario in which the majority of spores fall close to the parental sporocarp and mate with close neighbors. Other spores are captured in surface air currents and dispersed to other populations nearby. A few spores are transported to higher convection layers that disperse them many miles. The overall factor that limits the dispersal of C. formosus is not capacity to disperse, but more likely environmental factors such as availability of host trees like Douglas fir, Hemlock, and Sitka Spruce, proper moisture conditions of the soil, and low exchangeable acidity.
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