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vol.28 número1CARACTERÍSTICAS BIOLÓGICAS DE TRICHOGRAMMA EXIGUUM EM OVOS DE ANAGASTA KUEHNIELLA E SITOTROGA CEREALELLAOBTENCIÓN DE MODELOS PARA LA DETERMINACIÓN DE LA EVAPOTRANSPIRACIÓN DE REFERENCIA EN CONDICIONES DE CLIMA SUBHÚMEDO SECO EN LAS TUNAS, CUBA índice de autoresíndice de materiabúsqueda de artículos
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Idesia (Arica)

versión On-line ISSN 0718-3429

Resumen

CARRIZO, P; PONTACUARTO, A; CUIROLO, J.I  y  LOPEZ, M.V. ABUNDANCE OF GRASSHOPPERS (ORTHOPTERA: ACRIDIDAE) THROUGH RESOURCES WITHIN A REEF FARM (BUENOS AIRES PROVINCE). Idesia [online]. 2010, vol.28, n.1, pp.43-53. ISSN 0718-3429.  http://dx.doi.org/10.4067/S0718-34292010000100007.

We analysed the abundance of grasshoppers through forage resources within a farm. Four types were considered: legumes pasture (with and without grazing), grass pasture and soybean. Two operators performed the sampling with net, between November and April (8 lines/plot: 4 in their edges, 4 inside). They were compared in total abundance by means of ANVA (DBA) and Tukey. In a Split-Plot designed location (higher plot) and Operator (small plot) by means of ANVA and DGC. Tettigoniidae dominated in grasses (>90%), and had no relevance (<5%) in soybean. Acrididae (true grasshoppers) dominated (>90%) in soybean and were the most important in legume pasture (>60%) while the Tettigoniidae (30%) was the second. Those with the highest abundance in first generation in legume pasture and grasses were D. punctulatus and a Tettigoniidae. In the second generation, two Gomphocerinae (Acrididae) were the most important. In soybean, the highest abundance in January was because of juvenile forms and in February was because of adults (R. (Dichroplus) bergi, a Gomphocerinae and D. punctulatus). In grasses and legume pastures, the same species trended to dominate as adults and juveniles; although it did not happen in soybean. That Tettigoniidae very abundant in grasses, were also in high numbers in legume pastures, but almost did not appear in soybean. However, if that species would require high levels of forage in legume pasture, it could force the dominant Acridoidea there, to move to the soybean. In edges of plots were detected high densities only related with certain kind of neighbours: a similar resource with high densities or non-removed areas (roads and water canals). When considering all edges with the same plot, this effect was diluted and there was not difference between them and the centre of the plot. Differences between operators were not detected.

Palabras clave : grasshoppers; abundance; net; resources.

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