No additive genetic variance for tolerance to ethynylestradiol exposure in natural populations of brown trout (Salmo trutta).

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Ressource 1Download: Cunha_et_al-2019-Evolutionary_Applications.pdf (895.76 [Ko])
State: Public
Version: Final published version
License: CC BY 4.0
Serval ID
serval:BIB_0FE280FF700B
Type
Article: article from journal or magazin.
Collection
Publications
Title
No additive genetic variance for tolerance to ethynylestradiol exposure in natural populations of brown trout (Salmo trutta).
Journal
Evolutionary applications
Author(s)
Marques da Cunha L., Uppal A., Seddon E., Nusbaumer D., Vermeirssen ELM, Wedekind C.
ISSN
1752-4571 (Print)
ISSN-L
1752-4571
Publication state
Published
Issued date
06/2019
Peer-reviewed
Oui
Volume
12
Number
5
Pages
940-950
Language
english
Notes
Publication types: Journal Article
Publication Status: epublish
Abstract
One of the most common and potent pollutants of freshwater habitats is 17-alpha-ethynylestradiol (EE2), a synthetic component of oral contraceptives that is not completely eliminated during sewage treatment and that threatens natural populations of fish. Previous studies found additive genetic variance for the tolerance against EE2 in different salmonid fishes and concluded that rapid evolution to this type of pollution seems possible. However, these previous studies were done with fishes that are lake-dwelling and hence typically less exposed to EE2 than river-dwelling species. Here, we test whether there is additive genetic variance for the tolerance against EE2 also in river-dwelling salmonid populations that have been exposed to various concentrations of EE2 over the last decades. We sampled 287 adult brown trout (Salmo trutta) from seven populations that show much genetic diversity within populations, are genetically differentiated, and that vary in their exposure to sewage-treated effluent. In order to estimate their potential to evolve tolerance to EE2, we collected their gametes to produce 730 experimental families in blockwise full-factorial in vitro fertilizations. We then raised 7,302 embryos singly in 2-ml containers each and either exposed them to 1 ng/L EE2 (an ecologically relevant concentration, i.e., 2 pg per embryo added in a single spike to the water) or sham-treated them. Exposure to EE2 increased embryo mortality, delayed hatching time, and decreased hatchling length. We found no population differences and no additive genetic variance for tolerance to EE2. We conclude that EE2 has detrimental effects that may adversely affect population even at a very low concentration, but that our study populations lack the potential for rapid genetic adaptation to this type of pollution. One possible explanation for the latter is that continuous selection over the last decades has depleted genetic variance for tolerance to this synthetic stressor.
Keywords
EE2, Estrogen, Salmonidae, additive genetic variance, rapid evolution
Pubmed
Web of science
Open Access
Yes
Create date
22/12/2018 4:56
Last modification date
20/08/2019 13:36
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