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          Institute: MPI für Evolutionsbiologie     Collection: Evolutionary genetics     Display Documents

ID: 572549.0, MPI für Evolutionsbiologie / Evolutionary genetics
Species introduction promotes hybridization and introgression in Coregonus: is there sign of selection against hybrids?
Authors:Kahilainen, Kimmo K.; Østbye, Kjartan; Harrod, Chris; Shikano, Takahito; Malinen, Tommi; Merilä, Juha
Date of Publication (YYYY-MM-DD):2011-09
Title of Journal:Molecular Ecology
Issue / Number:18
Start Page:3838
End Page:3855
Review Status:not specified
Audience:Not Specified
Abstract / Description:Species introductions are considered one of the major drivers of biodiversity loss via ecological interactions and genetic admixture with local fauna. We examined two well-recognized fish species, native whitefish (Coregonus lavaretus) and introduced vendace (Coregonus albula), as well as their morphological hybrids in a single lake to test for selection against hybrids and backcrosses in the wild. A representative random subsample of 693 individuals (27.8%) was taken from the total catch of coregonids. This subsample was examined with the aim to select c. 50 individuals of pure whitefish (n = 52), pure vendace (n = 55) and putative hybrid (n = 19) for genetic analyses. The subsequent microsatellites and mitochondrial (mt) DNA analyses provided compelling evidence of hybridization and introgression. Of the 126 fish examined, four were found to be F(1), 14 backcrosses to whitefish and seven backcrosses to vendace. The estimates of historical gene flow suggested higher rates from introduced vendace into native whitefish than vice versa, whereas estimates of contemporary gene flow were equal. Mitochondrial introgression was skewed, with 18 backcrosses having vendace mtDNA and only three with whitefish mtDNA. Hybrids and backcrosses had intermediate morphology and niche utilization compared with parental species. No evidence of selection against hybrids or backcrosses was apparent, as both hybrid and backcross growth rates and fecundities were high. Hybrids (F(1)) were only detected in 2 year-classes, suggesting temporal variability in mating between vendace and whitefish. However, our data show that hybrids reached sexual maturity and reproduced actively, with backcrosses recorded from six consecutive year-classes, whereas no F(2) individuals were found. The results indicate widespread introgression, as 10.8% of coregonids were estimated to be backcrosses
Free Keywords:fitness; gene flow; gill raker; morphology; natural selection; niche
External Publication Status:published
Document Type:Article
Communicated by:Brigitte Lechner
Affiliations:MPI für Evolutionsbiologie/Abt. Evolutionsgenetik
External Affiliations:Univ Helsinki, Kilpisjarvi Biol Stn, FI-99490 Kilpisjarvi, Finland; Univ Helsinki, Dept Environm Sci, FI-00014 Helsinki, Finland; Univ Oslo, Dept Biol, CEES, NO-0316 Oslo, Norway; Hedmark Univ Coll, Dept Forestry & Wildlife Management, NO-2418 Elverum, Norway; Queens Univ Belfast, Ctr Med Biol, Sch Biol Sci, Belfast BT9 7BL, Antrim, North Ireland; Univ Helsinki, Ecol Genet Res Unit, Dept Biosci, FI-00014 Helsinki, Finland
Identifiers:ISSN:0962-1083 (print) [ID-No:1]
ISSN:1365-294X (online) [ID-No:2]
DOI:10.1111/j.1365-294X.2011.05209.x [ID-No:3]
LOCALID:2863/S 39206 [Listen-Nummer/S-Nummer]
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