Abstract
Jumping and swimming are key locomotor traits in frogs intimately linked to survival and dispersal. French populations of the frog Xenopus laevis from the invasion front are known to possess greater terrestrial locomotor endurance. Here, we tested whether individuals from the invasion front show differences in their muscle physiology that may underlie the observed whole-organism performance differences. We measured muscle contractile properties of the isolated gastrocnemius muscle in vitro, including isometric stress, activation and relaxation time, and work loop power output, both before and during a period of fatiguing contractions. We found that frogs from the centre of the range can produce tetanus force in their gastrocnemius muscle faster than animals from the periphery of the range, which could contribute to higher performance in one-off jumps. Yet, populations did not differ in muscle endurance. These results, coupled with previous work on this invasive population of Xenopus laevis, suggest that the greater stamina observed in individuals from the periphery may be more due to anatomical differences such as longer hind limbs and larger hearts along with potentially other as of yet untested physiological differences rather than differences in the mechanical properties of skeletal muscle.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
Research and capture permits were provided by the Préfet of the Deux-Sèvres department.
Funding
This research was funded by the ERA-Net BiodivERsA, with the national funders ANR, DFG, BELSPO and FCT, as part of the 2013 BiodivERsA call for research proposals. INVAXEN “Invasive biology of Xenopus laevis in Europe: ecology, impact and predictive models” project ANR-13-EBID-0008-01.
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Conceptualization: Anthony Herrel; Methodology: Rob S. James; Formal analysis and investigation: Pablo Padilla, Jason Tallis, Josh Hurst,Rob S. James, Anthony Herrel; Writing—original draft preparation: Pablo Padilla, Rob S. James, Anthony Herrel; Writing—review and editing: all authors; Funding acquisition: Anthony Herrel; Resources: Julien Courant; Supervision: Anthony Herrel, Rob S. James.
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The authors declare that they have no conflict of interest.
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Ethics approval for the muscle mechanics experiments was provided by Coventry University (# P66560).
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Communicated by G. Heldmaier.
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Padilla, P., Tallis, J., Hurst, J. et al. Do muscle contractile properties drive differences in locomotor performance in invasive populations of Xenopus laevis in France?. J Comp Physiol B 190, 771–778 (2020). https://doi.org/10.1007/s00360-020-01310-4
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DOI: https://doi.org/10.1007/s00360-020-01310-4