Estudo comparativo da fauna de artropodes associada a plantas de Sida Rhombifolia L. (Malvaceae) sadias e, infectadas naturalmentes pelo virus da cloros e infecciosa das malvaceas

AUTOR(ES)
DATA DE PUBLICAÇÃO

1993

RESUMO

Phytophagous insects use many different plant characters as cues to locate and exploit suitable hosts. Some viruses may cause severe changes on plants, that may affect the associated insects. The aim of the present work is to analyse the influence of infection by abutilon virus 1. in Sida rhombifolia (Malvaceae) on the structure and composition of the arthropod communities associated with this weed in natural conditions. Samples of plants and their associated arthropods were taken every 2 weeks during a year. Data were collected in 16000m2 area at Santa Elisa farm, Campinas, SP. Plant height and biomass (dry weight), and arthropod biomass were measured. Cluster and Principal Component Analyses did not show any relevant differences amongst plant phytophagous communities occuring on infected and non-infected S. rhombifolia plants. However, significant differences were detected at the population level. Aphids, the more abundant group, presented higher density in infected plants. These insects were responsible for lower Shannon diversity index detected in infected plants. Higher densities of spiders and 2 other insect species were also detected on these plants. On the other hand, 2 different insect species were more numerous in non-infected plants. The white fly, c.f.Bemisia tabaci (Homoptera: Alleyrodidae), vector of this viruse, did not show significant numerical difference between infected and non-infected plants. The size of some insect populations on infected plants were compensated by size of other species populations on non-infected ones. This fact attenuated, at the community level, differences presented at the population level. This compensation may be a consequence of differential responses of insect populations to infected plants. In spite of that, interactive mechanisms amongst arthropod populations may be also occurring

ASSUNTO(S)

malvacea artropode viroses

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