Ecological causes of morphological evolution in the three-spined stickleback

Rowena Spence, Robert J. Wootton, Iain Barber, Miroslaw Przybylski, Carl Smith*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Citations (SciVal)
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Abstract

The central assumption of evolutionary theory is that natural selection drives the adaptation of populations to local environmental conditions, resulting in the evolution of adaptive phenotypes. The three-spined stickleback (Gasterosteus aculeatus) displays remarkable phenotypic variation, offering an unusually tractable model for understanding the ecological mechanisms underpinning adaptive evolutionary change. Using populations on North Uist, Scotland we investigated the role of predation pressure and calcium limitation on the adaptive evolution of stickleback morphology and behavior. Dissolved calcium was a significant predictor of plate and spine morph, while predator abundance was not. Stickleback latency to emerge from a refuge varied with morph, with populations with highly reduced plates and spines and high predation risk less bold. Our findings support strong directional selection in three-spined stickleback evolution, driven by multiple selective agents.

Original languageEnglish
Pages (from-to)1717-1726
Number of pages10
JournalEcology and Evolution
Volume3
Issue number6
DOIs
Publication statusPublished - 06 May 2013

Keywords

  • Adaptation
  • Calcium concentration
  • Gasterosteus aculeatus
  • Natural selection
  • Nuptial coloration
  • Phenotypic adaptation
  • Selective predation

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