Shedding light on environmentally transmitted parasites: darker conditions within lakes promote larger epidemics

Clara Shaw, Spencer Hall, Erin Overholt, Carla Cáceres, Craig Williamson & Meghan Duffy
Parasite fitness depends on a successful journey from one host to another. For parasites that are transmitted environmentally, abiotic conditions might modulate the success of this journey. Here we evaluate how light, a key abiotic factor, influences spatiotemporal patterns of zooplankton disease where light varies seasonally, across lakes, and with depth in a lake. In an in situ experiment using those three sources of variation, we tested sensitivity of spores of two parasites to ambient...
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