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Position specificity in the genus Coreomyces (Laboulbeniomycetes, Ascomycota).

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  • 1Systematic Biology, Department of Organismal Biology, Evolutionary Biology Centre, Uppsala University, Uppsala, Sweden.

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Insect-parasitic fungi, Coreomyces, show position specificity on water boatman hosts. Genetic analysis reveals distinct fungal clusters correlating with attachment sites, suggesting nuanced host-parasite interactions.

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Area of Science:

  • Mycology
  • Entomology
  • Evolutionary Biology

Background:

  • The fungal genus Coreomyces (Laboulbeniaceae, Laboulbeniales) are insect parasites.
  • Understanding host-parasite specificity is crucial in evolutionary biology.

Purpose of the Study:

  • To investigate position specificity of Coreomyces thalli on corixid hosts (Corixidae, Heteroptera).
  • To determine if fungal clades correlate with specific attachment positions and host sex.

Main Methods:

  • Sampling of corixid hosts in southern Scandinavia.
  • Detection and analysis of Coreomyces thalli in five distinct positions.
  • Phylogenetic analysis using nuclear ribosomal DNA (ITS, LSU, SSU) and mitochondrial ribosomal DNA.

Main Results:

  • Four distinct fungal clades were identified, correlating with thalli positions.
  • Specific positions like the left abdomen and ventral right side showed distinct clades.
  • Mid-ventral and dorsal positions (male hosts only) comprised mixed clades.
  • Significant correlation found between fungal clade and host position, and a weak correlation with host sex.

Conclusions:

  • Position on the host is a significant factor in Coreomyces evolution.
  • Host sex specificity might be a continuum with weak preferences rather than absolute specificity.