Mating preference in 9 populations of three-spined sticklebacks.
A data frame with 9 observations of one variable.
a numeric vector
McKinnon, J. S., S. Mori, B.K. Blackman, L. David, D.M. Kingsley, L. Jamieson, J. Chou, and D. Schluter. 2004. Evidence for ecology's role in speciation. Nature 429: 294-298.
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