Virulence reaction norms across a food gradient
Autor(es): Bedhomme Stephanie,Agnew Philip,Sidobre Christine,Michalakis Yannis
Resumo: Host-parasite interactions involve competition for nutritional resources between hosts and the parasites growing within them. Consuming part of a host's resources is one cause of a parasite's virulence, i.e. part of the fitness cost imposed on the host by the parasite. The influence of a host's nutritional conditions on the virulence of a parasite was experimentally tested using the mosquito Aedes aegypti and the microsporidian parasite Vavraia culicis. A condition-dependent expression of virulence was found and a positive relation between virulence and transmissibility was established. Spore production was positively influenced by host food availability, indicating that the parasite's within-host growth is limited by host condition. We also investigated how the fitness of each partner varied across the nutritional gradient and demonstrated that the sign of the correlation between host fitness and parasite fitness depended on the amount of nutritional resources available to the host.
Imprenta: Proceedings. Biological Sciences / The Royal Society, v. 271, n. 1540, p. 739-744, 2004
Identificador do objeto digital: 10.1098/rspb.2003.2657
Descritores: Aedes aegypti - Pathogenesis ; Aedes aegypti - Clinical examination
Data de publicação: 2004
