Temperature-dependent costs of parasitism and maintenance of polymorphism under genotype-by-environment interactions

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Temperature-dependent costs of parasitism and maintenance of polymorphism under genotype-by-environment interactions. / Vale, P. F.; Stjernman, Martin; Little, T. J.

I: Journal of evolutionary biology, Vol. 21, Nr. 5, 2008, s. 1418-1427.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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TY - JOUR

T1 - Temperature-dependent costs of parasitism and maintenance of polymorphism under genotype-by-environment interactions

AU - Vale, P. F.

AU - Stjernman, Martin

AU - Little, T. J.

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

KW - Pasteuria ramosa

KW - infectivity

KW - host-parasite

KW - genotype-by-environment interaction

KW - genetic variation

KW - cost of parasitism

KW - Daphnia magna

KW - virulence evolution

KW - transmission

KW - temperature

U2 - 10.1111/j.1420-9101.2008.01555.x

DO - 10.1111/j.1420-9101.2008.01555.x

M3 - Article

VL - 21

SP - 1418

EP - 1427

JO - Journal of evolutionary biology

T2 - Journal of evolutionary biology

JF - Journal of evolutionary biology

SN - 1420-9101

IS - 5

ER -