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The University of Chicago Press
ABSTRACTThe effect of ontogenetic increases in total length on burst swimming performance was investigated in tadpoles of the striped marsh frog (Limnodynastes peronii) over the total-length range of 1.5-4 cm and Gosner developmental stages 25-38. The burst swimming performance of tadpoles at 10Њ and 24ЊC was determined by videotaping startle responses with a highspeed video camera at 200 Hz and analysing the sequences frame by frame. Maximum swimming velocity ( ) and ac-U max celeration ( ) increased with total length (L) at a rate that A max was proportionally greater than the increase in total length (i.e., positive allometry; exponents 11) and was described by the allometric equations and at changes in water viscosity did not affect the relationship between total length and burst swimming performance. At their , Reynolds numbers ranged from approximately 1,500 in U max the smaller tadpoles up to 50,000 for the larger animals at 24ЊC. We suggest the positive allometry of in larval L. peronii U max was due in part to the increases in tail width (TW) with total length ( L 1.66 ), possibly reflecting the increasing im-TW = Ϫ1.36