Temporal variation in divergent selection on spine number in threespine stickleback.

  title={Temporal variation in divergent selection on spine number in threespine stickleback.},
  author={Thomas Edward Reimchen and Patrik Nosil},
  journal={Evolution; international journal of organic evolution},
  volume={56 12},
Short-term temporal cycles in ecological pressures, such as shifts in predation regime, are widespread in nature yet estimates of temporal variation in the direction and intensity of natural selection are few. Previous work on threespine stickleback (Gasterosteus aculeatus) has revealed that dorsal and pelvic spines are a defense against gape-limited predators but may be detrimental against grappling insect predators. In this study, we examined a 15-year database from an endemic population of… CONTINUE READING


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