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Epidemiology of a Daphnia-Multiparasite System and Its Implications for the Red Queen
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Epidemiology of a Daphnia-Multiparasite System and Its Implications for the Red Queen
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Epidemiology of a Daphnia-Multiparasite System and Its Implications for the Red Queen
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Journal Article
Epidemiology of a Daphnia-Multiparasite System and Its Implications for the Red Queen
2012
Overview
The Red Queen hypothesis can explain the maintenance of host and parasite diversity. However, the Red Queen requires genetic specificity for infection risk (i.e., that infection depends on the exact combination of host and parasite genotypes) and strongly virulent effects of infection on host fitness. A European crustacean (Daphnia magna)--bacterium (Pasteuria ramosa) system typifies such specificity and high virulence. We studied the North American host Daphnia dentifera and its natural parasite Pasteuria ramosa, and also found strong genetic specificity for infection success and high virulence. These results suggest that Pasteuria could promote Red Queen dynamics with D. dentifera populations as well. However, the Red Queen might be undermined in this system by selection from a more common yeast parasite (Metschnikowia bicuspidata). Resistance to the yeast did not correlate with resistance to Pasteuria among host genotypes, suggesting that selection by Metschnikowia should proceed relatively independently of selection by Pasteuria.
