Speciation reversal in European whitefish (Coregonus lavaretus (L.)) caused by competitor invasion
Permanent lenke
https://hdl.handle.net/10037/5965Dato
2014Type
Journal articleTidsskriftartikkel
Peer reviewed
Forfatter
Bhat, Shripathi; Amundsen, Per-Arne; Knudsen, Rune; Gjelland, Karl Øystein; Fevolden, Svein-Erik; Bernatchez, Louis; Præbel, KimSammendrag
Invasion of exotic species has caused the loss of biodiversity and imparts evolutionary and ecological changes in the
introduced systems. In northern Fennoscandia, European whitefish (Coregonus lavaretus (L.)) is a highly polymorphic species
displaying adaptive radiations into partially reproductively isolated and thus genetically differentiated sympatric morphs
utilizing the planktivorous and benthivorous food niche in many lakes. In 1993, Lake Skrukkebukta was invaded by vendace
(Coregonus albula (L.)) which is a zooplanktivorous specialist. The vendace displaced the densely rakered whitefish from its
preferred pelagic niche to the benthic habitat harbouring the large sparsely rakered whitefish. In this study, we investigate
the potential influence of the vendace invasion on the breakdown of reproductive isolation between the two whitefish
morphs. We inferred the genotypic and phenotypic differentiation between the two morphs collected at the arrival (1993)
and 15 years after (2008) the vendace invasion using 16 microsatellite loci and gill raker numbers, the most distinctive
adaptive phenotypic trait between them. The comparison of gill raker number distributions revealed two modes growing
closer over 15 years following the invasion. Bayesian analyses of genotypes revealed that the two genetically distinct
whitefish morphs that existed in 1993 had collapsed into a single population in 2008. The decline in association between
the gill raker numbers and admixture values over 15 years corroborates the findings from the Bayesian analysis. Our study
thus suggests an apparent decrease of reproductive isolation in a morph-pair of European whitefish within 15 years (. 3
generations) following the invasion of a superior trophic competitor (vendace) in a subarctic lake, reflecting a situation of
‘‘speciation in reverse’’.
Forlag
Public Library of Science (PLoS)Sitering
PLoS ONE 9(2014) nr. 3 s. e91208-Metadata
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