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Light exposure decreases infectivity of the Daphnia parasite Pasteuria ramosa

Erin P. Overholt, View ORCID ProfileMeghan A. Duffy, Matthew P. Meeks, Taylor H. Leach, Craig E. Williamson
doi: https://doi.org/10.1101/789628
Erin P. Overholt
1Department of Biology, Miami University, Oxford, OH
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  • For correspondence: overhoep@miamioh.edu
Meghan A. Duffy
2Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI
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  • ORCID record for Meghan A. Duffy
Matthew P. Meeks
1Department of Biology, Miami University, Oxford, OH
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Taylor H. Leach
1Department of Biology, Miami University, Oxford, OH
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Craig E. Williamson
1Department of Biology, Miami University, Oxford, OH
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ABSTRACT

Climate change is altering light regimes in lakes, which should impact disease outbreaks, since sunlight can harm aquatic pathogens. However, some bacterial endospores are resistant to damage from light, even surviving exposure to UV-C. We examined the sensitivity of Pasteuria ramosa endospores, an aquatic parasite infecting Daphnia zooplankton, to biologically relevant wavelengths of light. Laboratory exposure to increasing intensities of UV-B, UV-A, and visible light significantly decreased P. ramosa infectivity, though there was no effect of spore exposure on parasitic castration of the host. P. ramosa is more sensitive than its Daphnia host to damage by longer wavelength UV-A and visible light; this may enable Daphnia to seek an optimal light environment in the water column where both UV-B damage and parasitism are minimal. Studies of pathogen light sensitivity help us uncover factors controlling epidemics in lakes, which is especially important given that water transparency is decreasing in many lakes.

Footnotes

  • Email: overhoep{at}miamioh.edu, duffymeg{at}umich.edu, meeksmp{at}miamioh.edu, leachth{at}miamioh.edu, and craig.williamson{at}miamioh.edu

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted October 07, 2019.
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Light exposure decreases infectivity of the Daphnia parasite Pasteuria ramosa
Erin P. Overholt, Meghan A. Duffy, Matthew P. Meeks, Taylor H. Leach, Craig E. Williamson
bioRxiv 789628; doi: https://doi.org/10.1101/789628
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Light exposure decreases infectivity of the Daphnia parasite Pasteuria ramosa
Erin P. Overholt, Meghan A. Duffy, Matthew P. Meeks, Taylor H. Leach, Craig E. Williamson
bioRxiv 789628; doi: https://doi.org/10.1101/789628

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