Ergosterol Content of Fungi Associated with Dendroctonus ponderosae and Dendroctonus rufipennis (Coleoptera: Curculionidae, Scolytinae)

By B. Bentz, D. Six. 2006

162 citations recorded by the source corpus.

Abstract Insects require sterols for normal growth, metamorphosis, and reproduction, yet they are unable to synthesize these organic compounds and are therefore dependent upon a dietary source. For phloephagous species, such as Dendroctonus bark beetles, whose food does not necessarily contain appropriate types or adequate quantities of sterols, fungal symbionts may provide an alternative source in the form of ergosterol. We determined and compared the relative amounts of ergosterol in the primary fungal associates of Dendroctonus ponderosae Hopkins and Dendroctonus rufipennis Kirby. Ergosterol content of host tree phloem naturally infested with larvae (and their fungal symbionts) of both species also was compared with ergosterol contents in uninfested phloem tissue. Mycelia of Ophiostoma montium (Rumfold) von Arx and Ophiostoma clavigerum (Robinson-Jeffrey & Davidson) Harrington isolated from D. ponderosae mycangia, and Leptographium abietinum (Peck) Wingfield isolated from the exoskeleton of D. ruifpennis contained relatively large quantities of ergosterol, although no significant differences in content were found among these fungal species. Phloem colonized by larvae of both species contained significantly more ergosterol than did uninfested host phloem tissue. Our results suggest that larval life stages of D. ponderosae and D. rufipennis may obtain vital nutrients not only from the host tree phloem but also from fungal symbionts, in the form of ergosterol, while mining larval galleries.

Subfields: Ecology, Genetics, Insect Science

View Paper: https://www.semanticscholar.org/paper/df2c526ea477c6fee8d115aaa919e8473c616804

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Citations in the corpus

Spruce Beetle Biology, Ecology and Management in the Rocky Mountains: An Addendum to Spruce Beetle in the Rockies (2014, unknown): “The prominence of blue-staining fungal associates and the degree to which these fungi affect spruce beetle-host systems often varies from strongly positive to strongly negative [74,80,81].”
The microbiome of pest insects: it is not just bacteria (2019, background): “…functions by molds The importance of molds to the life history of pest insects have been documented in bark beetles belonging to the genusDendroctonus, which feed on phloem tissues and rely on fungi for nutrients throughout their life cycle (Ayres et al., 2000; Bentz & Six, 2006; Davis, 2015).”