Diversity and abundance of arthropods in subtropic

Authors: Leila Lucia Fritz Elvis Arden Heinrichs Vilmar Machado Tiago Finger Andreis Marciele Pandolfo Silvia Martins de Salles Jaime Vargas de Oliveira Lidia Mariana Fiuza

Publish Date: 2011/06/14

Volume: 20, Issue: 10, Pages: 2211-

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Abstract

This paper describes a survey of arthropods in ricegrowing areas of Rio Grande do Sul Brazil undertaken to identify the main groups of insect pests and their natural enemies present in three producing regions during the stages of crop development The study was conducted during the crop years 2007/2008 and 2008/2009 in the municipalities of Cachoeira do Sul Eldorado do Sul and Capivari do Sul A total of 44231 arthropods were collected 26821 in 2007/2008 and 17410 in 2008/2009 Spatial and temporal patterns were analyzed utilizing the 28 principal families and applying the Morisita–Horn coefficient and the Detrended Correspondence Analysis DCA Both results demonstrated variances of abundance and richness from 1 year to the next in the evaluated areas The results indicate that the arthropod communities in southern Brazilian rice crop agroecosystems are formed of a few families with high abundance and a large number of other smaller families Among the phytophagous arthropods found Pentatomidae Orthoptera and planthoppers were predominant while the natural enemies were mainly predatory mites spiders Hymenoptera and Odonata This study demonstrates that irrigated rice fields located in subtropical areas of the Brazilian South sustain a great variety of arthropods which facilitate studies on biodiversity conservation and the development of sustainable management of the pestsWe thank the following experts for their assistance in identification of the arthropods Everton Nei Lopes Rodrigues in the identification of the Araneae order Maria Helena Mainieri Galileo André Franco Franceschini and Luciano de Azevedo Moura of the Museu de Ciências Naturais da Fundação Zoobotânica do RS for identification of some coleopteron specimens Jocélia Grazia and Caroline Greve of the Universidade Federal do Rio Grande do Sul UFRGS for the identification of the Heteroptera Adriano Cavalleri of the UFRGS for assistance with the Thysanoptera order Celso Oliveira Azevedo and Marcelo Tavares of the Universidade Federal do Espírito Santo for help in identifying the Hymenoptera Ana Maia Pés of the Instituto Nacional de Pesquisa of Amazonia for identification of the Trichoptera order and Noeli Juarez Ferla and Liana Johann of the Museu de Ciências Naturais da Univates in Lajeado Rio Grande do Sul for mite identification We acknowledge the Fulbright Foundation USA/Brazil for the fellowship provided Dr Heinrichs to conduct the research at UNISINOS

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