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Intraspecific variation in resistance of frog eggs to fungal infection

Sagvik, Jörgen; Uller, Tobias LU ; Stenlund, Therese and Olsson, Mats (2008) In Evolutionary Ecology 22(2). p.193-201
Abstract
Documenting sources of variation in host viability at pathogen exposure within and among populations is an important task in order to predict host-pathogen evolutionary dynamics. In the present study, we investigated family and population variation in the degree of embryonic infection of the pathogenic fungus Saprolegnia spp., by infecting moor frog (Rana arvalis) eggs from six populations and exposing them to two different temperatures. We found a significant family effect on the degree of Saprolegnia-infection of eggs and embryos, suggesting that there is genetic variation in resistance among embryos, or variation among females in some aspect of maternally induced resistance. Furthermore, infection level differed significantly between... (More)
Documenting sources of variation in host viability at pathogen exposure within and among populations is an important task in order to predict host-pathogen evolutionary dynamics. In the present study, we investigated family and population variation in the degree of embryonic infection of the pathogenic fungus Saprolegnia spp., by infecting moor frog (Rana arvalis) eggs from six populations and exposing them to two different temperatures. We found a significant family effect on the degree of Saprolegnia-infection of eggs and embryos, suggesting that there is genetic variation in resistance among embryos, or variation among females in some aspect of maternally induced resistance. Furthermore, infection level differed significantly between temperatures, with most families having more infected eggs in the relatively colder temperature. However, eggs and embryos from the different populations showed different degrees of Saprolegnia-infection in the two temperatures, i.e., there was a significant population x temperature interaction on the proportion of infected eggs. Thus, the degree of Saprolegnia-infection is sensitive to variation at the level of the family, population and environmental conditions, suggesting that responses to fungal outbreaks will vary geographically and will be difficult to predict. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
in
Evolutionary Ecology
volume
22
issue
2
pages
193 - 201
publisher
Springer
external identifiers
  • scopus:39049148473
ISSN
1573-8477
DOI
10.1007/s10682-007-9168-6
language
English
LU publication?
no
id
19eb44cf-bf8e-4fdd-be97-4d2d48d8181c (old id 4731531)
date added to LUP
2014-11-11 12:50:19
date last changed
2017-08-13 04:09:14
@article{19eb44cf-bf8e-4fdd-be97-4d2d48d8181c,
  abstract     = {Documenting sources of variation in host viability at pathogen exposure within and among populations is an important task in order to predict host-pathogen evolutionary dynamics. In the present study, we investigated family and population variation in the degree of embryonic infection of the pathogenic fungus Saprolegnia spp., by infecting moor frog (Rana arvalis) eggs from six populations and exposing them to two different temperatures. We found a significant family effect on the degree of Saprolegnia-infection of eggs and embryos, suggesting that there is genetic variation in resistance among embryos, or variation among females in some aspect of maternally induced resistance. Furthermore, infection level differed significantly between temperatures, with most families having more infected eggs in the relatively colder temperature. However, eggs and embryos from the different populations showed different degrees of Saprolegnia-infection in the two temperatures, i.e., there was a significant population x temperature interaction on the proportion of infected eggs. Thus, the degree of Saprolegnia-infection is sensitive to variation at the level of the family, population and environmental conditions, suggesting that responses to fungal outbreaks will vary geographically and will be difficult to predict.},
  author       = {Sagvik, Jörgen and Uller, Tobias and Stenlund, Therese and Olsson, Mats},
  issn         = {1573-8477},
  language     = {eng},
  number       = {2},
  pages        = {193--201},
  publisher    = {Springer},
  series       = {Evolutionary Ecology},
  title        = {Intraspecific variation in resistance of frog eggs to fungal infection},
  url          = {http://dx.doi.org/10.1007/s10682-007-9168-6},
  volume       = {22},
  year         = {2008},
}