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Genetic Erosion In Wild Populations Makes Resistance To A Pathogen More Costly: Genetic Erosion Makes Resistance More Costly
CNRS UMR 5023 Ecologie des Hydrosystemes Naturels et Anthropises, Universite Claude Bernard Lyon, Universite de Lyon, France.
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2012 (English)In: Evolution, ISSN 0014-3820, E-ISSN 1558-5646, Vol. 66, no 6, 1942-1952 p.Article in journal (Refereed) Published
Abstract [en]

Populations that have suffered from genetic erosion are expected to exhibit reduced average trait values or decreased variation in adaptive traits when experiencing periodic or emergent stressors such as infectious disease. Genetic erosion may consequentially modify the ability of a potential host population to cope with infectious disease emergence. We experimentally investigate this relationship between genetic variability and host response to exposure to an infectious agent both in terms of susceptibility to infection and indirect parasite-mediated responses that also impact fitness. We hypothesized that the deleterious consequences of exposure to the pathogen (Batrachochytrium dendrobatidis) would be more severe for tadpoles descended from European treefrog (Hyla arborea)populations lacking genetic variability. Although all exposed tadpoles lacked detectable infection, we detected this relationship for some indirect host responses, predominantly in genetically depleted animals, as well as an interaction between genetic variability and pathogen dose on life span during the postmetamorphic period. Lack of infection and a decreased mass and postmetamorphic life span in lowgenetic diversity tadpoles lead us to conclude that genetic erosion, while not affecting the ability tomount effective resistance strategies, also erodes the capacity to invest in resistance, increased tadpole growth rate, and metamorphosis relatively simultaneously.

Place, publisher, year, edition, pages
2012. Vol. 66, no 6, 1942-1952 p.
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Natural Sciences
URN: urn:nbn:se:uu:diva-214082DOI: 10.1111/j.1558-5646.2011.01570.xISI: 000304757200021OAI: oai:DiVA.org:uu-214082DiVA: diva2:683966
Available from: 2014-01-07 Created: 2014-01-07 Last updated: 2014-04-29Bibliographically approved

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Luquet, Emilien
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