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Diversity of locust gut bacteria protects against pathogen invasion

Dillon, R J and Vennard, C T and Buckling, A and Charnley, A K (2005) Diversity of locust gut bacteria protects against pathogen invasion. Ecology Letters, 8 (12). pp. 1291-1298. ISSN 1461-023X

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Abstract

Diversity-invasibility relationships were explored in the novel context of the colonization resistance provided by gut bacteria of the desert locust Schistocerca gregaria against pathogenic bacteria. Germ-free insects were associated with various combinations of one to three species of locust gut bacteria and then fed an inoculum of the pathogenic bacterium Serratia marcescens. There was a significant negative relationship between the resulting density of Serratia marcescens and the number of symbiotic gut bacterial species present. Likewise there was a significant inverse relationship between community diversity and the proportion of locusts that harboured Serratia. Host mortality was not negatively correlated with resistance to gut-invasion by Serratia marcescens, although there were significantly more deaths among pathogen fed germ-free insects than tri-associated gnotobiotes. The outcome is consistent with the predictions of community ecology theory that species-rich communities are more resistant to invasion than species-poor communities.

Item Type: Article
Journal or Publication Title: Ecology Letters
Uncontrolled Keywords: colonization resistance ; diversity ; germ free ; locusts ; Schistocerca gregaria ; Serratia marcescens ; SALMONELLA-TYPHIMURIUM INFECTION ; SCHISTOCERCA-GREGARIA ; DESERT LOCUST ; PARASITE VIRULENCE ; METARHIZIUM-ANISOPLIAE ; MULTIPLE INFECTION ; LINKING DIVERSITY ; GNOTOBIOTIC MICE ; COMMUNITIES ; RESISTANCE
Subjects: UNSPECIFIED
Departments: Faculty of Health and Medicine > Biomedical & Life Sciences
ID Code: 50569
Deposited By: ep_importer_pure
Deposited On: 29 Oct 2011 00:21
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 19:40
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/50569

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