Spatial organization within social ambrosia beetle nests limits spread of infectious disease.

ABSTRACT: Ambrosia beetles are social, fungal-farming insects that nest within tree xylem. Their close living conditions make them potentially vulnerable to microbial infectious diseases. We show that the insect pathogenic fungus Metarhizium anisopliae effectively infects and kills Xyleborus affinis adults, even within sawdust-based colony habitats. Healthy beetles did not avoid infected nestmates, and increased contact led to higher mortality and reduced offspring; however, larvae and pupae were still produced, even when colonies began with only infected beetles. Diseased individuals and Metarhizium CFUs were concentrated in the upper third of the nest, while surviving adults and brood were found in the middle/lower areas. A beetle symbiotic fungus, Neocosmospora sp. Xa1

SUBMITTER: Masoudi A 

PROVIDER: S-EPMC12392322 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature