Kjell Larsson, Henk P. van der Jeugd, Ineke T. van der Veen, Par Forslund, Body Size Declines Despite Positive Directional Selection on Heritable Size Traits in a Barnacle Goose Population, Evolution, Vol. 52, No. 4 (Aug., 1998), pp. 1169-1184
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Larsson et al. (1998) studied this question.