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First published online July 2, 2004
Journal of Experimental Biology 207, 2745-2753 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.01091

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Scaling of jaw muscle size and maximal bite force in finches

M. A. A. van der Meij^* and R. G. Bout

Department of Evolutionary Morphology, Institute of Biology Leiden, PO Box 9516, 2300 RA Leiden, The Netherlands

View larger version (68K): [in a new window]   Fig. 1. Tool for bite force measurements. A: rigid metal plates that are slightly pressed together by the bills of a bird biting on the plates (notice the rounded ridge to prevent pressure of the rest of the bill). B: connection to the force transducer.

View larger version (13K): [in a new window]   Fig. 2. Regression lines for jaw muscle mass versus body mass with common slope (r2=0.890) for estrildids (grey squares; Y=0.63+1.29X) and fringillids (black triangles; Y=0.81+1.29X).

View larger version (28K): [in a new window]   Fig. 3. Regression lines for the log-transformed mass of different jaw muscle groups versus log transformed body mass with common slope (r2=0.908) for estrildids (grey) and fringillids (black). Markers used in separate muscle complexes graphs equals the all muscle complexes graph.

View larger version (11K): [in a new window]   Fig. 4. Regression lines for bite force versus body mass with common slope (r2=0.87) for estrildids (grey squares; y=–1.19+1.44x) and fringillids (black triangles; y=–1.04+1.44x).