Sep 7, 2012

Temperature effects on the biomechanics of prey capture in the frog Rana pipiens

Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology
Paula E Sandusky, Stephen M Deban

Abstract

Movements of many animals are powered by a combination of active shortening of muscles and recoil of elastic structures. Movements that rely primarily on elastic recoil, such as the explosive locomotor and feeding movements of many ectotherms, have been shown to exhibit lower thermal dependence than muscle-powered movements because elastically powered movements circumvent the effects of temperature on muscle contractile dynamics. To determine if elastic recoil contributes to the ballistic mouth opening and tongue projection of the frog Rana pipiens, we examined feeding kinematics and dynamics of tongue and jaw movements at three ambient temperatures (10, 15, and 25°C) using 6,000 Hz image sequences. We found that ballistic mouth opening exhibits high instantaneous power (up to 1,783 W kg(-1) of muscle mass) and its dynamics have low thermal dependence (Q(10) values of 1.02-1.37), indicating the contribution of elastic recoil. The dynamics of tongue projection are more thermally dependent (Q(10) of 1.35-2.51) and likely involve muscle activity during the movement. Mouth opening during prey transport, as well as tongue retraction and mouth closing showed little evidence of elastic recoil and their dynamics show relatively high th...Continue Reading

  • References24
  • Citations6

References

  • References24
  • Citations6

Citations

Mentioned in this Paper

Rana pipiens
Exploration With a Probe
Biomechanics
Kinematics
Bufonidae
Benign Neoplasm of Tongue
Tongue
PYURF gene
Entire Tongue
Anaxyrus terrestris

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