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Acta Amazonica

Print version ISSN 0044-5967On-line version ISSN 1809-4392


AMORIM, Maristela Ascenção  and  ADIS, Joachim. Food consumption of a Neotropical grasshopper, Stenacris fissicauda fissicauda (Bruner, 1908) (Orthoptera: Acrididae) from the Amazonian "Várzea". Acta Amaz. [online]. 1994, vol.24, n.3-4, pp.289-301. ISSN 0044-5967.

Average leaf consumption of the grasshopper species Stenacris f. fissicauda is determined. The results are expressed as grams of leaf biomass/gram dry weight grasshopper/ day. The material used in the experiments was collected on Ilha de Marchantaria (island of "várzea ' - Rio Solimões) near Manaus. The animals were grouped accoding to nymph stage (initial (l+ll), middle (III+IV), final (V+VI)), and sex (males, females, males+females). The plant used as food was Paspalum repens, an aquatic macrophytc of the Poaceae on which Stenacris f. fissicaudadevelops its life cycle. The initial stage nymphs consumed the most (0.7740 g/g of animal bio-mass/day), while the smallest consume of leaf biomass was done by adults (0.2622 g/g of animal biomass/day). The calculated average consumption was about 0.5 g (dry weight) of leaf biomass consumed per gram (dry weight) of animal biomass/day. Data are compared with leaf consumption of Cornops aquatietun (Acrididae) on Eichiiornia crassipes (Pontederiaceae) from the same area.

Keywords : Orthoptera; Acrididae; Food Consumed; Aquatic Macrophytes; "Várzea".

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