Morphological segregation of Icelandic threespine stickleback (Gasterosteus aculeatus L)

Bjarni K. Kristjánsson*, Skúli Skúlason, David L.G. Noakes

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Icelandic threespine sticklebacks show parallel sympatric morphological differences related to different substrate habitats in four Icelandic lakes. The level of morphological diversification varies among the lakes, ranging from a population with a wide morphological distribution to a population with clear resource morphs, where morphological diversification was reflected in diet differences. These differences in morphological divergence are closely related to the differences in the ecological surroundings of each population. This appears to be resource polymorphism, which may lead to population differentiation and speciation. Trophically related sexual dimorphism was also common in these sticklebacks, which is possibly the result of sexual selection or habitat segregation by the sexes.

Original languageEnglish
Pages (from-to)247-257
Number of pages11
JournalBiological Journal of the Linnean Society
Volume76
Issue number2
DOIs
Publication statusPublished - Jun 2002

Other keywords

  • Diet
  • Lava
  • Morphology
  • Mud
  • Parallel patterns
  • Resource polymorphism
  • Sympatric

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