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Biogeography and genotypic diversity of <i>Metarhizium brunneum</i> and <i>Metarhizium robertsii</i> in northwestern North American soils<i></i>.

The biogeography and genotype diversity of <i>Metarhizium</i> species in northwestern North American soils was examined; twenty ecoregions were sampled, including 58 agricultural and 80 natural habitat subsites, and areas that were glaciated during the Pleistocene epoch. One hundred and twenty nine isolates of <i>M. brunneum</i>, 26 isolates of <i>M. robertsii</i>, four isolates of <i>M. guizhouense</i>, one isolate of <i>M. flavoviride</i>, and 55 isolates of <i>Beauveria</i> were recovered. <i>Metarhizium</i> and <i>Beauveria</i> species were isolated in diverse ecoregions within the study area, but a trend for increased isolation of <i>Metarhizium</i> species in western regions of the study area was observed. Consistent with this observation, the prevalence of <i>M. brunneum</i> and <i>M. robertsii</i> decreased at higher elevations, and the opposite was true for <i>Beauveria</i>. Both <i>M. brunneum</i> and <i>M. robertsii</i> were more commonly isolated from agricultural and natural habitat subsites, and considerable genotypic diversity was observed in both habitats and within the same subsite. <i>Metarhizium robertsii</i> but not <i>M. brunneum</i> was more commonly isolated from non-glaciated locations; however, less diversity and richness was observed for <i>M. brunneum</i> recovered from glaciated versus non-glaciated locations consistent with insular biogeography. The study has implications for microbial control strategies in the region.

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