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First published online January 25, 2005
Journal of Experimental Biology 208, 461-468 (2005)
Published by The Company of Biologists 2005
doi: 10.1242/jeb.01369
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Variation in morphology and performance of predator-sensing system in wild cricket populations

Olivier Dangles*, Christelle Magal, Dominique Pierre, Aurélie Olivier and Jérôme Casas

Université de Tours, IRBI UMR CNRS 6035, Parc Grandmont, 37200 Tours, France



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  		Fig. 1. Canonical discriminant ordination of the five cricket populations based on cercal variables. Arrows drawn from the centroid of the population dispersion indicate cercal variables that significantly contribute to the model (A, total length of the cercus; B, number of hairs; C, number of hairs longer than 1000 µm).

 


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  		Fig. 2. Distribution of hair lengths of a mean cricket from the five populations. Grey bars indicate hair with a length longer than 1000 µm.

 


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  		Fig. 3. Cercal canopy response as a function of signal frequency for the five cricket populations. (A) Total response, (B) proportion (%) of variation from a mean cercal canopy response. Legends of populations are given in (B). Peak air velocity is 0.3 mm s-1. Arrows in (A) indicate signal frequencies emitted by running (30 Hz) and flying (170 Hz) natural predators of crickets.

 


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  		Fig. 4. Relationship between cricket perception level (cercal hair canopy response) and predator signal intensity (air particle velocity) for the five cricket populations. (A) Running predator (f=30 Hz), (B) flying predator (f=170 Hz). Arrows indicate, for a given perception level, the difference in air flow intensity detected between the more and the less sensitive population.

 

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© The Company of Biologists Ltd 2005