Postglacial intra-lacustrine divergence of Icelandic threespine stickleback morphs in three neovolcanic lakes.

G A Olafsdottir, S S Snorrason, Michael Gordon Ritchie

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

The geographical context of divergence and local adaptation of lacustrine fish is controversial. Despite recent theoretical support for sympatric and parapatric divergence, empirical studies providing unequivocal support for this remain scant. An important component of such a case would be where multiple lakes have different morphs and a range of markers, both mitochondrial and nuclear, show monophyly within lakes. Here we describe such a situation for threespine sticklebacks in three lakes in Iceland. By analysing the variation at nuclear and mitochondrial markers in several freshwater and marine populations as well as three pairs of intra-lacustrine morphs we infer their phylogenetic relationships and colonization pattern. There were high levels of microsatellite variation in all populations and no evidence was found for either repeated colonization of marine fish or colonization from distinct glacial refugia. Intra-lacustrine threespine stickleback morphs in all three lakes show significant genetic divergence probably indicating restricted gene flow.

Original languageEnglish
Pages (from-to)1870-1881
Number of pages12
JournalJournal of Evolutionary Biology
Volume20
DOIs
Publication statusPublished - Sept 2007

Keywords

  • Gasterosteus aculeatus
  • local adaptation
  • parallel evolution
  • population structure
  • speciation
  • WHITEFISH COREGONUS-CLUPEAFORMIS
  • RECENT POPULATION BOTTLENECKS
  • ALLELE FREQUENCY DATA
  • SYMPATRIC SPECIATION
  • MITOCHONDRIAL-DNA
  • GASTEROSTEUS-ACULEATUS
  • PARALLEL EVOLUTION
  • FRESH-WATER
  • MICROSATELLITE VARIATION
  • GENETIC ARCHITECTURE

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