title: A test for within-lake niche differentiation in the nine-spined sticklebacks (Pungitius pungitius).
abstract: Specialization for the use of different resources can lead to ecological speciation. Accordingly, there are numerous examples of ecologically specialized pairs of fish "species" in postglacial lakes. Using a polymorphic panel of single nucleotide variants, we tested for genetic footprints of within-lake population stratification in nine-spined sticklebacks (Pungitius pungitius) collected from three habitats (viz. littoral, benthic, and pelagic) within a northern Swedish lake. Analyses of admixture, population structure, and relatedness all supported the conclusion that the fish from this lake form a single interbreeding unit.
authors.affiliation: Ecological Genetics Research Unit Department of Biosciences University of Helsinki Helsinki Finland.
authors.forename: Federico C F
authors.initials: FC
authors.lastname: Calboli
authors.affiliation: Department of Ecology and Environmental Sciences Umeå University Umeå Sweden.
authors.forename: Pär
authors.initials: P
authors.lastname: Byström
authors.affiliation: Ecological Genetics Research Unit Department of Biosciences University of Helsinki Helsinki Finland.
authors.forename: Juha
authors.initials: J
authors.lastname: Merilä
keywords: Ecological speciation; Gasterosteidae; SNP; habitat differentiation; niche; stickleback