Abstract

AbstractIn this study the trail following behaviour of the caterpillar Yponomeuta cagnagellus (Hübner) (Lepidoptera, Yponomeutidae) is investigated. It is demonstrated that these caterpillars follow trails made by conspecifics. Ablation experiments show that at least part of this behaviour is directed by the tactile senses, but additional chemical cues cannot be excluded. In choice experiments using trails from different species, Y. cagnagellus strongly preferred conspecific trails over those from Malacosoma neustria, but did not prefer conspecific over other Yponomeuta trails. This lack of species‐specificity within Yponomeuta is discussed and it is concluded that trail following is probably of little help in the elucidation of the evolutionary history of the genus.RésuméLa façon dont Ypotiomeuta cagnagellus suit les pistesCette étude traite de la façon dont les chenilles de Y. cagnagellus Hübner (Lépido. Yponomeutidae) suivent des pistes. Elles suivent les pistes de leurs congénères. Par ablation, on peut montrer qu'une partie au moins de ce comportement est due à des perceptions tactiles, mais que l'intervention d'informations chimiques complémentaires ne peut être exclue. En présence de choix entre traces de différentes espèces, elles préfèrent nettement les traces des congénères à celles de Malacosoma neustria, mais ne choisissent pas entre les différentes espèces d'yponomeutes. L'absence de spécificité parmi le genre Yponomeuta montre que la sélection des pistes est probablement de peu d'utilité pour l'étude de l'histoire évolutive du genre.

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