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In parasite battles, weakness is a boost

A new study led by Georgia Institute of Technology (Georgia Tech) researchers reveals that the number of vertebrate predators in the water and the amount of food available for Daphnia to eat influence the size of the epidemics and how these “water fleas” evolve during epidemics to survive.

The study shows that lakes with high nutrient concentrations and lower predation levels exhibit large epidemics and Daphnia that become more resistant to infection by the yeast Metschnikowia bicuspidata. However, in lakes with fewer resources and high predation, epidemics remain small and Daphnia evolve increased susceptibility to the parasite.

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