Estimate biodiversity araneids (Arthropoda: Queliceriformes) and Formicidae (Insecta: Hymenoptera) in cultures of soybean and peanuts from a site of the ecoregion Pampeana

摘要

 The arthropods are a dominant group due to his morphologic characteristics. La Pampa not only possesses a scanty knowledge of the arthropodological fauna, but also presents an expansion of the agricultural area on the natural ecosystems. As controllers of these plagues, we find the spiders and the ant. The aim of this work is to evaluate the biodiversity of spiders (araneids) and the ants (formicids), in two crops peanut and soybean located in Maisonave, North-East of La Pampa, (64o S and 35o O). Samples were carried about all over a hectare of surface from December, 2008 to March, 2009. In every plot three transects were settled separated one another by 25 meters. In each transect each pitfall was placed to a distance of 25 meters. The obtained material was preserved in alcohol to 80% and settled in the subject Biology of the Invertebrate II, Faculty of Exact and Natural Sciences, of the U.N.L.Pam. The analyses were performed with Estimates. The obtained results show a dominance of the species Solenopsis saevissima in the ants (formicids); while in the spiders (araneids) the families Lycosidae and Thomisidae are the ones which present major abundance