Light exposure decreases infectivity of the Daphnia parasite Pasteuria ramosa

Light exposure decreases infectivity of the Daphnia parasite Pasteuria ramosa
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光照会降低水蚤寄生虫巴斯德氏菌的传染性

DOI:
10.1093/plankt/fbz070
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发表时间:
2020
影响因子:
2.1
通讯作者:
Williamson, Craig E
Williamson, Craig E
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Overholt, Erin P;Duffy, Meghan A;Meeks, Matthew P;Leach, Taylor H;Williamson, Craig E

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气候变化正在改变湖泊的光照状况,这可能会影响疾病的爆发,因为阳光会伤害水生病原体。然而,一些细菌内生孢子能够抵抗光的损害,甚至在 UV-C 照射下也能幸存。我们检查了巴氏杆菌(一种感染浮游蚤的水生寄生虫)对生物学相关光波长的敏感性。实验室暴露于强度不断增加的 UV-B、UV-A 和可见光的情况显着减少。 ramosainfectivity,尽管孢子暴露对受感染宿主的寄生去势没有影响。 ramosa比其寄主水蚤对更长波长的UV-A和可见光的损害更敏感;这可能使水蚤能够在水体中寻找最佳的光环境,其中 UV-B 损害和寄生都最小。对病原体光敏感性的研究有助于我们揭示控制湖泊流行病的因素,鉴于许多湖泊的水透明度正在下降,这一点尤其重要。
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 ofPasteuria ramosaendospores, an aquatic parasite infectingDaphniazooplankton, to biologically relevant wavelengths of light. Laboratory exposure to increasing intensities of UV-B, UV-A, and visible light significantly decreasedP. ramosainfectivity, though there was no effect of spore exposure on parasitic castration of infected hosts.P. ramosais more sensitive than itsDaphniahost to damage by longer wavelength UV-A and visible light; this may enableDaphniato 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 to uncover factors controlling epidemics in lakes, which is especially important given that water transparency is decreasing in many lakes.
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