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First published online August 31, 2007
Journal of Experimental Biology 210, 3165-3170 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.004648
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Escape performance decreases during ontogeny in wild crickets

O. Dangles1,2,*, D. Pierre1, J. P. Christides1 and J. Casas1

1 Université de Tours, IRBI UMR CNRS 6035, Parc Grandmont, 37200 Tours, France
2 IRD (R072), c/o CNRS LEGS, BP1, 91198 Gif-sur-Yvette cedex, France


Figure 1
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  		Fig. 1. (A) Detailed drawing and (B) picture of the portable design used to simulate and record cricket escape responses under field conditions. See the text for further explanation and references to letters in A.

 

Figure 2
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  		Fig. 2. High-speed videographic sequence of an air-evoked escape response performed by a juvenile wood cricket (N. sylvestris) after being subjected to the predatory strike simulator (piston, P). Time (T; ms) from the start of the piston is shown in each frame. (A) A cricket in its resting position as the piston is approaching from the rear. (B) The cricket enhances its escape behaviour by a flexion of its hind legs. (C) The cricket starts jumping (some sand is moved away by the action of hind legs).

 

Figure 3
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  		Fig. 3. (A) Escape distances normalised to total body length of wood crickets (N. sylvestris) for three different instars: juvenile I (Juv. 1), juvenile II (Juv. 2) and adults (Ad.) at three piston velocities (40 mm s–1, 150 mm s–1 and 300 mm s–1). Numbers indicate two or three crickets escaping at similar distance values. As shown on the drawing (B), the tip of the cerci lines up with the x-axis. An escape distance of zero corresponds to the tip of the cerci being touched by the piston (P). Bold arrows represent the direction of piston movement. Positive and negative values of escape distances correspond to air- and touch-evoked responses, respectively. Note that the y-axis in the touch-evoked graphs is more than an order of magnitude less than in the air-evoked graphs.

 




© The Company of Biologists Ltd 2007