Fungi are more dispersal limited than bacteria among flowers

Author:

Vannette Rachel L.ORCID,McMunn Marshall S.ORCID,Hall Griffin W.,Mueller Tobias G.ORCID,Munkres IvanORCID,Perry DouglasORCID

Abstract

AbstractVariation in dispersal ability among taxa affects community assembly and biodiversity maintenance within metacommunities. Although fungi and bacteria frequently coexist, their relative dispersal abilities are poorly understood. Nectar-inhabiting microbial communities affect plant reproduction and pollinator behavior, and are excellent models for studying dispersal of bacteria and fungi in a metacommunity framework. Here, we assay dispersal ability of common nectar bacteria and fungi in an insect-based dispersal experiment. We then compare these results to the incidence and abundance of culturable flower-inhabiting bacteria and fungi within naturally occurring flowers across two coflowering communities in California across two flowering seasons. Our microbial dispersal experiment demonstrates that bacteria disperse among habitat patches more readily than fungi via thrips. Across all flowers, bacterial and fungal incidence and abundance were positively correlated but bacteria were much more widespread, suggesting shared dispersal routes or habitat requirements but differences in dispersal and colonization frequency. The finding that bacteria are more common among flowers sampled here, in part due to superior insect-mediated dispersal, may have broad relevance for microbial life-history, community assembly of microbes and plant-pollinator interactions.

Publisher

Cold Spring Harbor Laboratory

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