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First published online October 18, 2006
Journal of Experimental Biology 209, 4363-4370 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02485
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Ontogeny of air-motion sensing in cricket

O. Dangles1,2, D. Pierre1, C. Magal1, F. Vannier1 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) Photographs of the wood cricket (Nemobius sylvestris) showing the location of the cercal sensory system at the end of the abdomen (black arrows); Scale bar, 2 mm. (B,C) Scanning electron microscopy images illustrating the change in cercal receptors size and number throughout development in N. sylvestris: (B) first instar; Scale bar, 20 µm; (C) adult; Scale bar, 100 µm. Images are of the basal region of the left cercus. Cl, clavate hairs; Tr, trichoid hairs; Fi, filiform hairs.

 

Figure 2
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  		Fig. 2. Relationship between the density of filiform hair receptors and the instar of N. sylvestris. Linear regression: y=-43.0x+469.3; r2=0.91, Spearman's P<0.001.

 

Figure 3
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  		Fig. 3. Length-frequency distribution of all cercal filiform hairs inserted on the cercus throughout development in N. sylvestris (from instar I to adult; Ad). Adjustment curves represent the decomposition of the mixture distribution into Gaussian distributions. Parameter estimations and goodness-of-fit for each distribution are given in Table 1.

 

Figure 4
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  		Fig. 4. Pair correlation function G(r) of the cercal filiform hair point pattern throughout development (instar I to adult; Ad) in N. sylvestris. The broken line gives the function for the null model of complete spatial randomness.

 

Figure 5
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  		Fig. 5. Cercal hair canopy response to increasing air velocity as a function of signal frequency throughout development (instar I to adult; Ad) in N. sylvestris. (A) Peak air velocity 0.05 cm s-1, (B) peak air velocity 5 cm s-1.

 

Figure 6
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  		Fig. 6. Characteristics of optimal performances of the cercal sensory system throughout development (instars I to adults; Ad) in N. sylvestris. (A) Canopy response at best-tuned frequency; (B) value of the best tuned frequency at v=5 cm s-1.

 




© The Company of Biologists Ltd 2006