S. J. Ormerod, J. O'Halloran, S. D. Gribbin, Stephanie J. Tyler, The Ecology of Dippers Cinclus cinclus in Relation to Stream Acidity in Upland Wales: Breeding Performance, Calcium Physiology and Nestling Growth, Journal of Applied Ecology, Vol. 28, No. 2 (Aug., 1991), pp. 419-433
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Ormerod et al. (1991) studied this question.
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