Solar radiation decreases parasitism in Daphnia.

Abstract:

:Climate change and variation in atmospheric ozone are influencing the intensity of ultraviolet radiation (UVR) reaching ecosystems. Changing UVR regimes, in turn, may alter epidemics of infectious disease. This possibility hinges on the sensitivity of epidemiologically relevant traits of host and parasite to UVR. We address this issue using a planktonic system (a zooplankton host, Daphnia dentifera, and its virulent fungal parasite, Metschnikowia bicuspidata). Controlled laboratory experiments, coupled with in situ field incubations of spores, revealed that quite low levels of UVR (as well as longer wavelength light) sharply reduced the infectivity of fungal spores but did not affect host susceptibility to infection. The parasite's sensitivity to solar radiation may underlie patterns in a lake survey: higher penetration of solar radiation into lakes correlated with smaller epidemics that started later in autumn (as incident sunlight declined). Thus, solar radiation, by diminishing infectivity of the parasite, may potently reduce disease.

journal_name

Ecol Lett

journal_title

Ecology letters

authors

Overholt EP,Hall SR,Williamson CE,Meikle CK,Duffy MA,Cáceres CE

doi

10.1111/j.1461-0248.2011.01707.x

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

47-54

issue

1

eissn

1461-023X

issn

1461-0248

journal_volume

15

pub_type

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