Rev. Soc. Entomol. Argent.  vol.70 issue3-4; Abstract: S0373-56802011000200004

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Revista de la Sociedad Entomológica Argentina

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BRAGA, Carlos Elias; GUTJAHR, Ana Lúcia Nunes-; MORAIS, José Wellington de  and  ADIS, Joachim. Phenology of Cornops aquaticum (Orthoptera: Acrididae) associated with Eichhornia crassipes (Pontederiaceae) in a Floodplain Lake in Central Amazonia, Brazil. Rev. Soc. Entomol. Argent. [online]. 2011, vol.70, n.3-4, pp. 185-196. ISSN 0373-5680.

The Neotropical grasshopper Cornops aquaticum (Bruner) lives associated with the macrophytes of the family Pontederiaceae from which it feeds. In the lakes of Central Amazon, Eichhornia crassipes (Mart.) Solms (water hyacinth or Mururé) is considered the most important host plant for this grasshopper. This study aimed to perform a phenological study of adults and nymphs of grasshopper in association with its host plant, compared to the hydrological regime of the Central Amazon. This study was undertaken between April 2006 and August 2007 at the Chameleon Lake (03 17'05"S, 60 11'11"W) in the Central Amazon floodplain. An entomological net adapted for catching grasshoppers was used. 850 individuals (296 adults and 554 nymphs) were captured. It was observed that the abundance and biomass of adults and nymphs of C. aquaticum, as well as their macrophyte host are related to the "flood pulse", ie. to the seasonal oscillations of the Amazonian rivers.

Keywords : Semi-aquatic grasshopper; Phenological study; Amazon Region; Water hyacinth.

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