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The spider community in soybean cultures in the Buenos Aires Province, Argentina La comunidad de aranas del cultivo de soja en la provincia de Buenos Aires, Argentina


The spider community in soybean cultures in the Buenos Aires Province, Argentina La comunidad de aranas del cultivo de soja en la provincia de Buenos Aires, Argentina



Neotropical Entomology. April-June; 312: 197-210



The spiders are one of the most important predators that produce the mortality of the plague insects. The spider community was sampled with nets, plant pocketed and pit fall traps on soybean crop and the wild vegetation on the borders (2h manual capture). The samples are done during the crop development (December to mid-May) and, in the fallow period (mid-May to November), in order to know spiders specific composition, to compare specific diversity through Shannon index, and, to analyze the colonization process. Total specific richness was 37 species grouped in 13 families, and the dominant species was Misumenops pallidus (Keyserling) (Thomisidae). The higher diversity was recorded in wild vegetation (H=2.829, and 25 species), then the herbal stratum of crop showed the highest affinity (H=2.140, and 28 species), lowest diversity was recorded during the fallow period (H=1.050, and 12 species). The early species colonizing the crop (December) belong to the families Thomisidae, Anyphaenidae and Oxyopidae, after them Araneidae and Corinnidae were recorded, the late colonizing were the Salticidae species. Thomisidae species were always the most abundant, predominating from February to April. The lowest density of species of spiders was found on December in the border crop, but the distribution, from the border to the center crop, from January to March, did not show any gradient. The occurrence of several species belonging to different guild in all the plots suggests that the spiders are an important limiting effect on insect populations, as soon as the importance of the preservation of natural areas in techniques of biological control.

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