Temperature-dependent costs of parasitism and maintenance of polymorphism under genotype-by-environment interactions
Författare
Summary, in English
The maintenance of genetic variation for infection-related traits is often attributed to coevolution between hosts and parasites, but it can also be maintained by environmental variation if the relative fitness of different genotypes changes with environmental variation. To gain insight into how infection-related traits are sensitive to environmental variation, we exposed a single host genotype of the freshwater crustacean Daphnia magna to four parasite isolates (which we assume to represent different genotypes) of its naturally co-occurring parasite Pasteuria ramosa at 15, 20 and 25 degrees C. We found that the cost to the host of becoming infected varied with temperature, but the magnitude of this cost did not depend on the parasite isolate. Temperature influenced parasite fitness traits; we found parasite genotype-by-environment (G x E) interactions for parasite transmission stage production, suggesting the potential for temperature variation to maintain genetic variation in this trait. Finally, we tested for temperature-dependent relationships between host and parasite fitness traits that form a key component of models of virulence evolution, and we found them to be stable across temperatures.
Publiceringsår
2008
Språk
Engelska
Sidor
1418-1427
Publikation/Tidskrift/Serie
Journal of evolutionary biology
Volym
21
Issue
5
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
John Wiley & Sons Inc.
Ämne
- Ecology
Nyckelord
- Pasteuria ramosa
- infectivity
- host-parasite
- genotype-by-environment interaction
- genetic variation
- cost of parasitism
- Daphnia magna
- virulence evolution
- transmission
- temperature
Status
Published
Forskningsgrupp
- Biodiversity and Conservation Science
ISBN/ISSN/Övrigt
- ISSN: 1420-9101