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Time course and reversibility of changes in the gizzards of red knots alternately eating hard and soft food

Anne Dekinga^1,*, Maurine W. Dietz², Anita Koolhaas¹ and Theunis Piersma^1,2

¹ Netherlands Institute for Sea Research (NIOZ), PO Box 59, 1790 AB Den Burg, Texel, The Netherlands and
² Centre for Ecological and Evolutionary Studies, Zoological Laboratory, University of Groningen, PO Box 14, 9750 AA Haren, The Netherlands

View larger version (28K): [in a new window]   Fig. 1. Variation in gizzard mass () and body mass () for (A) group A (N=10), (B) group B (N=9) and (C) group C (N=11). Values are means ± S.E.M. The experimental diet is indicated in each panel by non-shaded (hard mussel diet) and shaded (soft trout pellet diet) areas.

View larger version (22K): [in a new window]   Fig. 2. Changes in gizzard mass after a diet switch from mussels to trout pellets (A) or after a switch from trout pellets to mussels (B). Lines indicate the results of the continuous biphasic regression model fitted through the data. Parameters of the biphasic regression models are given in Table2. B1 represents the reaction of group B to the first diet switch trial; B2 represents the reaction of group B to the second diet switch trial. Values are means ± S.E.M.; group A (N=10), group B (N=9) and group C (N=11).