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Keywords:

  • benthic/limnetic species pair;
  • three-spined stickleback;
  • Gasterosteus aculeatus;
  • loss of biodiversity;
  • hybrids

In July 1999, 49 three-spined sticklebacks were sampled from Enos Lake, Canada. Here a benthic/limnetic species pair is known to exist. In the sample, six individuals (12%) were of intermediate phenotype. These represent 17% of the 35 males in the sample. This large number of intermediates contrasts with the 1% in previous samples reported in 1984 and 1992 and may signal the collapse of the species pair.