Ecological speciation
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Ecological speciation is a form of speciation arising from reproductive isolation that occurs due to an ecological factor that reduces or eliminates gene flow between two populations of a species. Eco
Three-spined stickleback fish have been a frequently studied species in ecological speciation.
The western American sagebrush Artemisia tridentata
Transition of hybrid forms between the white A. pubescens and the red-and-yellow A. formosa
Three-spined stickleback
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The three-spined stickleback is a fish native to most inland and coastal waters north of 30°N. It has long been a subject of scientific study for many reasons. It shows great morphological variation t
The fossil species G. doryssus is closely related to G. aculeatus, and had a very similar tendency for rapid evolution.
Male (reddish) and a gravid female three-spined stickleback
Three-spined sticklebacks may rarely have four spines.