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SummaryA means of investigating selection in marginal populations by analysing the change in variation between generations within them is described. It is illustrated by the analysis of spot-number variation in Maniola jurtina. A greater constancy of female spot-average between generations is found within both the more marginal populations of central-eastern Scotland and the peripheral populations of the Isles of Scilly than within those more centrally located in southern England. This result is discussed in relation to the ways in which selection may act in marginal populations.

Spot-number in Maniola jurtina—variation between generations and selection in marginal populations