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• W4319295169 abstract "Disease agents play an important role in the ecology and life history of wild and cultivated populations and communities. While most studies focus on the adaptation of parasites to their hosts, the adaptation of free-living parasite stages to their external (off-host) environment may tell us a lot about the factors that shape the distribution of parasites. Pasteuria ramosa is an endoparasitic bacterium of the water flea Daphnia with a wide geographical distribution. Its transmission stages rest outside of the host and thus experience varying environmental regimes. We examined the life history of P. ramosa populations from four environmental conditions (i.e. groups of habitats): the factorial combinations of summer-dry water bodies or not, and winter-freeze water bodies or not. Our goal was to examine how the combination of winter temperature and summer dryness affects the parasite's ability to attach to its host and to infect it. We subjected samples of the four groups of habitats to temperatures of 20, 33, 46 and 60°C in dry and wet conditions, and exposed a susceptible clone of Daphnia magna to the treated spores. We found that spores which had undergone desiccation endured higher temperatures better than spores kept wet, both regarding attachment and subsequent infection. Furthermore, spores treated with heightened temperatures were much less infective and virulent. Even under high temperatures (60°C), exposed spores from all populations were able to attach to the host cuticle, albeit they were unable to establish infection. Our work highlights the sensitivity of a host-free resting stage of a bacterial parasite to the external environment. Long heatwaves and harsh summers, which are becoming more frequent owing to recent climate changes, may therefore pose a problem for parasite survival. This article is part of the theme issue ‘Infectious disease ecology and evolution in a changing world’." @default.
• W4319295169 created "2023-02-07" @default.
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• W4319295169 date "2023-02-06" @default.
• W4319295169 modified "2023-10-10" @default.
• W4319295169 title "Out of the ‘host’ box: extreme off-host conditions alter the infectivity and virulence of a parasitic bacterium" @default.
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• W4319295169 doi "https://doi.org/10.1098/rstb.2022.0015" @default.
• W4319295169 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36744562" @default.
• W4319295169 hasPublicationYear "2023" @default.
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