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Gut microbiota of a long-distance migrant demonstrates resistance against environmental microbe incursions

journal contribution
posted on 01.10.2017, 00:00 authored by Alice Risely, D Waite, Beata UjvariBeata Ujvari, Marcel KlaassenMarcel Klaassen, Bethany Hoye
Migratory animals encounter suites of novel microbes as they move between disparate sites during their migrations, and are frequently implicated in the global spread of pathogens. Although wild animals have been shown to source a proportion of their gut microbiota from their environment, the susceptibility of migrants to enteric infections may be dependent upon the capacity of their gut microbiota to resist incorporating encountered microbes. To evaluate migrants' susceptibility to microbial invasion, we determined the extent of microbial sourcing from the foraging environment, and examined how this influenced gut microbiota dynamics over time and space in a migratory shorebird, the Red-necked stint. Contrary to previous studies on wild, non-migratory hosts, we found that stint on their non-breeding grounds obtained very little of their microbiota from their environment, with most individuals sourcing only 0.1% of gut microbes from foraging sediment. This microbial resistance was reflected at the population level by only weak compositional differences between stint flocks occupying ecologically-distinct sites, and by our finding that stint that had recently migrated 10,000 km did not differ in diversity or taxonomy from those that had inhabited the same site for a full year. However, recent migrants had much greater abundances of the genus Corynebacterium, suggesting a potential microbial response to either migration or exposure to a novel environment. We conclude that the gut microbiota of stint is largely resistant to invasion from ingested microbes, and that this may have implications for their susceptibility to enteric infections during migration.

History

Journal

Molecular ecology

Volume

26

Issue

20

Pagination

5842 - 2854

Publisher

Wiley

Location

London, Eng.

eISSN

1365-294X

Language

eng

Publication classification

C Journal article; C1 Refereed article in a scholarly journal

Copyright notice

2017, Wiley