Diversity of fungi attached to birds corresponds to the habitat ecologies of their avian dispersal vectors

Summary

Researchers found that birds carry hundreds of different types of fungi on their feathers and feet, with different bird species carrying different fungal communities based on where they live and what they eat. European robins living in deciduous forests and gardens carried different fungi than goldcrests living in conifer forests, suggesting birds pick up fungi from their specific habitats. This study shows that migrating birds may be important for spreading fungi across long distances, potentially including plant diseases and lichens that don’t spread well by wind.

Background

Animal-mediated transport of propagules is an important dispersal mechanism for many organisms, but remains understudied in fungi. Birds appear to be natural dispersal vectors for fungi due to their mobility and migratory patterns, potentially providing directed transport of fungal propagules to suitable establishment sites.

Objective

To identify and compare the diversity of fungi attached to bird species with contrasting habitat ecologies using environmental DNA metabarcoding of feather and feet swabs from European robins and goldcrests.

Results

Over 600 fungal taxa were identified attached to birds, with significant differences in fungal assemblages between the two bird species corresponding to their habitat preferences. Goldcrests had higher total fungal diversity including more ectomycorrhizal and wood-decaying fungi, while robins carried more plant pathogens and other parasites. Results suggest birds facilitate dispersal of plant pathogens, saprobic macrofungi, and sorediate macrolichens over medium to long distances.

Conclusion

Bird-mediated fungal transport is important for diverse fungal taxa, particularly those with specific habitat requirements and limited wind dispersal capacity. The correspondence between bird habitat ecology and transported fungal diversity indicates potential for passive directed dispersal, with implications for fungal population dynamics and conservation.
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