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First published online December 22, 2003
Journal of Experimental Biology 207, 475-482 (2004)
Published by The Company of Biologists 2004
doi: 10.1242/jeb.00787

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Effect of aestivation on long bone mechanical properties in the green-striped burrowing frog, Cyclorana alboguttata

Nicholas J. Hudson¹, Michael B. Bennett² and Craig E. Franklin^1,*

¹ School of Life Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia
² School of Biomedical Sciences, The University of Queensland, Brisbane, Queensland 4072, Australia

View larger version (17K): [in a new window]   Fig. 1. Illustration of the Instron materials testing apparatus used to measure femoral and tibiofibular bending strength in the green-striped burrowing frog (Cyclorana alboguttata). The diagram shows the direction of actuator travel with respect to bone orientation such that the posterior surface was loaded in compression.

View larger version (14K): [in a new window]   Fig. 2. (A) Change in resultant ground reaction force magnitude during a typical maximal jump for an adult C. alboguttata at 25°C recorded with a force platform sampling at 1000 Hz. (B) Typical load-displacement curve of a C. alboguttata long bone broken in three-point bending, sampled at 1000 Hz.

View larger version (13K): [in a new window]   Fig. 3. Relationship between C. alboguttata body mass (A) and body length (B) and time to peak ground reaction force during a maximal jump recorded with a force platform sampling at 1000 Hz. SVL,snout–vent length.

View larger version (122K): [in a new window]   Fig. 4. Transverse mineralised sections of the tibiofibula in (A) control and (B) 9-month-aestivating C. alboguttata. Scale bar, 0.2 mm.