Intraspecific variation in resistance of frog eggs to fungal infection |
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Authors: | Jörgen Sagvik Tobias Uller Therese Stenlund Mats Olsson |
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Institution: | 1. Department of Zoology, G?teborg University, Medicinaregatan 18, G?teborg, 405 30, Sweden 2. School of Biological Sciences, University of Wollongong, Wollongong, NSW, 2522, Australia
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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 × 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. |
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Keywords: | Egg mortality Host-pathogen interaction Rana arvalis Saprolegnia |
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