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

Vale, P. F.; Stjernman, Martin LU and Little, T. J. (2008) In Journal of Evolutionary Biology 21(5). p.1418-1427
Abstract
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... (More)
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. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Pasteuria ramosa, infectivity, host-parasite, genotype-by-environment interaction, genetic variation, cost of parasitism, Daphnia magna, virulence evolution, transmission, temperature
in
Journal of Evolutionary Biology
volume
21
issue
5
pages
1418 - 1427
publisher
John Wiley & Sons
external identifiers
  • wos:000258379600024
  • scopus:49549086827
ISSN
1420-9101
DOI
10.1111/j.1420-9101.2008.01555.x
language
English
LU publication?
yes
id
650b52b9-769d-46ad-8d60-0a726bc1ef96 (old id 1252801)
date added to LUP
2008-11-03 13:12:47
date last changed
2017-09-24 03:47:55
@article{650b52b9-769d-46ad-8d60-0a726bc1ef96,
  abstract     = {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.},
  author       = {Vale, P. F. and Stjernman, Martin and Little, T. J.},
  issn         = {1420-9101},
  keyword      = {Pasteuria ramosa,infectivity,host-parasite,genotype-by-environment interaction,genetic variation,cost of parasitism,Daphnia magna,virulence evolution,transmission,temperature},
  language     = {eng},
  number       = {5},
  pages        = {1418--1427},
  publisher    = {John Wiley & Sons},
  series       = {Journal of Evolutionary Biology},
  title        = {Temperature-dependent costs of parasitism and maintenance of polymorphism under genotype-by-environment interactions},
  url          = {http://dx.doi.org/10.1111/j.1420-9101.2008.01555.x},
  volume       = {21},
  year         = {2008},
}