Lecoq Michel, Pierozzi I.. 1996. Chromatic Polymorphism and Geophagy : two Outstanding Characteristics of Rhammatocerus schistocercoides (Rehn 1906) Grasshoppers in Brazil Orthoptera, Acrididae, Gomphocerinae. Journal of Orthoptera Research (5) : 13-17.
Autre titre : Polymorphisme chromatique et geophagie : deux caractéristiques remarquables des criquets Rhammatocerus schistocercoides (Rehn 1906) au Brésil Orthoptera, Acrididae, Gomphocerinae
Résumé : A study of coloration in #Rhammatocerus schistocercoides# (Rehn 1906) grasshoppers in natural conditions revealed substantial variability, with evidence of a new case of chromatic polymorphism. Green coloration is much more common in this species than previously assumed. The percentage of green adults, or those with a partially green integument,varied seasonally within the same generation according to the phenology and especially the sexual maturity of the population. The most important coloration change occurred in September, during the sexual maturation period, when the grasshopp- ers turned progressively from brown to green or partially green. The present study also highlights evidence of a geophagy phenomenon (consumption of large amounts of soil) that has never before been reported in locusts or grasshoppers. This yet unexplainable behaviour was particularly spectacular in terms of its scale.
Mots-clés Agrovoc : Rhammatocerus, polymorphisme, couleur, variation saisonnière
Mots-clés géographiques Agrovoc : Brésil, Mato Grosso
Classification Agris : L52 - Physiologie animale - Croissance et développement
H10 - Ravageurs des plantes
Auteurs et affiliations
- Lecoq Michel, CIRAD-GERDAT-PRIFAS (FRA)
- Pierozzi I.
Autres liens de la publication
- Document en bibliothèque
- Localisation du document : CD_BR6321 [(Bibliothèque de Lavalette)]
Source : Cirad - Agritrop (https://agritrop.cirad.fr/389779/)
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