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Kraak, S. B. M.; Mundwiler, B.; Hart, P. J. B.
Journal of fish biology, 05/2001, Volume: 58, Issue: 5Journal Article
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.
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