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1 June 2015 Intraspecific Signals Inducing Aggregation in Periplaneta americana (Insecta: Dictyoptera)
Saïd Imen, Malosse Christian, Durier Virginie, Rivault Colette
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Chemical communication is necessary to induce aggregation and to maintain the cohesion of aggregates in Periplaneta americana (L.) cockroaches. We aimed to identify the chemical message inducing aggregation in this species. Two types of bioassays were used—binary choice tests in Petri dishes and tests in Y-olfactometer. Papers conditioned by direct contact of conspecifics induce aggregation when proposed in binary choice tests and were attractive in a Y-olfactometer. The identification of the molecules present on these conditioned papers indicated that dichloromethane extracts contained mainly cuticular hydrocarbons whereas methanol extracts contained more volatile molecules. Only a mixture of extracts in both solvents induced aggregation. High concentrations of cuticular hydrocarbons are necessary to induce aggregation when presented alone. When presented with volatile molecules present in methanol extracts, low concentrations of cuticular hydrocarbons are sufficient to induce aggregation if they are presented in contact. Among volatile molecules collected on filter paper, a mixture of three compounds—hexadecanoic acid, pentadecanoic acid, and pentaethylene glycol—induced aggregation. Our results provide evidence that aggregation processes in P. americana relies on a dual mechanism: attraction over long distances by three volatile molecules and maintenance on site by contact with cuticular hydrocarbons.

© The Authors 2015. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For Permissions, please email:
Saïd Imen, Malosse Christian, Durier Virginie, and Rivault Colette "Intraspecific Signals Inducing Aggregation in Periplaneta americana (Insecta: Dictyoptera)," Environmental Entomology 44(3), 713-723, (1 June 2015).
Received: 9 January 2015; Accepted: 23 February 2015; Published: 1 June 2015

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behavioral test
cuticular hydrocarbon
Periplaneta americana
volatile fatty acid
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