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Coleoptera Associated with Undisturbed Cow Pats in Pastures in Southeastern Brazil

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Coleoptera Associated with Undisturbed Cow Pats in Pastures in Southeastern Brazil November - December 2006 715 ECOLOGY, BEHAVIOR AND BIONOMICS Coleoptera Associated with Undisturbed Cow Pats in Pastures in Southeastern Brazil JÚLIO MENDES¹ AND ARÍCIO X. LINHARES2 1Lab. Parasitologia, Instituto de Ciências Biomédicas, Univ. Federal de Uberlândia, Uberlândia MG 2Depto. Parasitologia, Instituto de Biologia, Univ. Estadual de Campinas, Campinas, SP Neotropical Entomology 35(6):715-723 (2006) Coleoptera Associados a Massas Fecais de Bovinos em Pastagens no Sudeste Brasileiro RESUMO - Coleoptera associados a fezes de gado bovino excretadas no pasto apresentam grande diversidade e abundância, e várias espécies são de importância veterinária por serem inimigos naturais de insetos-praga que se criam nesse tipo de substrato. Para se fazer um levantamento da abundância e diversidade dos Coleoptera associados a fezes bovinas no pasto, quatro massas fecais inteiras e 5 cm do solo imediatamente abaixo delas foram coletados semanalmente na maioria das vezes, de abril de 1992 a abril de 1994. As coletas foram feitas numa fazenda localizada nas proximidades da cidade de São Carlos, região central do estado de São Paulo. Os besouros foram extraídos das fezes com funis de Berlese, e também mantendo as fezes em recipientes cobertos com organza por 30 a 40 dias, coletando os besouros que emergissem. O total de 24.332 espécimes pertencentes a 13 famílias de besouros, e pelo menos 66 espécies foram identifi cadas. As famílias mais abundantes foram Aphodiidae, Staphylinidae and Scarabaeidae. Em geral, os besouros foram mais abundantes durante o período quente e úmido, de outubro a março, com algumas exceções. A importância dos besouros, tanto como inimigos naturais da mosca-dos-chifres como agentes da decomposição de massas fecais de bovinos é discutida. PALAVRAS-CHAVE: Fezes bovinas, besouro coprófago, diversidade, controle biológico, Brasil ABSTRACT - Coleoptera associated to undisturbed cattle droppings in pastures present great diversity and abundance. Several species are of primary veterinary importance for they may act as natural enemies of pest insects that breed in this habitat. To survey the diversity and abundance of Coleoptera associated to undisturbed cattle droppings, four undisturbed cattle dung pats naturally dropped in pastures and 5 cm of the soil immediately beneath them were collected almost all weekly from april 1992 to april 1994 in a farm located in the vicinity of São Carlos, State of São Paulo, Southeastern Brazil. Beetles were collected from the pats both using Berlese funnels and by allowing the beetles to emerge for 30 to 40 days. A total of 24,332 specimens belonging to 13 beetle families and at least 66 species were identifi ed. The most abundant and diverse families were Aphodiidae, Staphylinidae and Scarabaeidae. In general, the Coleoptera were more abundant in the warmer and wet period, from October to March, with a few exceptions. The importance of the beetles, both as horn fl y natural enemies and as cattle dung decaying agents, is discussed. KEY WORDS: Cattle dung, dung beetle, diversity, biological control Cattle dung pats naturally dropped in pastures are normally them as decomposing agents in the dung decaying process colonized by a diversifi ed arthropod community which has and in the control of dung breeding arthropod pests, mainly been studied in detail in several places (Merrit & Anderson Diptera (Ridsdill-Smith 1981, Anderson et al. 1984, Roth 1977, Cervenka & Moon 1991), especially in countries where et al. 1988). The introduction of the horn fl y, Haematobia dung incorporation into the soil is problematic (Macqueen & irritans (L.) (Diptera: Muscidae) into Northern Brazil was Beirne 1975, Ridsdill-Smith 1981, Summerlin et al. 1990). reported in the early 80’s (Valério & Guimarães 1982). Its The coprophagous fauna is composed mainly by Diptera and introduction and rapid dispersion to almost the entire country Scarabaeidae (Coleoptera), which are considered the most stimulated investigations on the arthropod community of important agents promoting dung pat decay (Laurence 1955, undisturbed cattle dung in pastures in Brazil (Flechtmann et Anderson et al. 1984, Cervenka & Moon 1991). Several al. 1995a, Guimarães & Mendes 1998, Mendes & Linhares studies have been done to determine the role of dung beetles 2002). This paper presents data on diversity and abundance in recycling the dung and to assess the possibility of using of cattle dung beetles collected during a two-year period in 716 Mendes & Linhares - Coleoptera Associated with Undisturbed Cow Pats in Pastures in Southeastern Brazil the vicinity of the city of São Carlos, State of São Paulo, were obtained from the four quarters of four dung pats (the Southeastern Brazil. equivalent of one dung pat) that were placed in the Berlese funnels. The Aphodiidae was the most abundant family Materials and Methods representing 48.11% of the extracted Coleoptera (Table 1). The endocoprids Nialaphodius nigrita Fabricius and Labarrus The studies were done at Fazenda Canchim (21.30° S; lividus (Olivier) represented 88.28% of the family and 42.38% 47° W), a farm belonging to Empresa Brasileira de Pesquisa of all Coleoptera. Among the Scarabaeidae, Dichotomius bos Agropecuária (EMBRAPA) in São Carlos, São Paulo (Blanchard) was the most frequent and constant species. This State. The experimental sites were pastures of Brachiaria and other paracoprid species present natural nocturnal and decumbens Saft. and Andropogon gayanus Kunth. From twilight activity (Koller et al. 1999, 2002; Aidar et al. 2000). April 1993 to April 1994 ten undisturbed cattle dung pats Because of this and due to the fact that dung pats were collected naturally dropped and 5 cm of the soil immediately beneath during the morning period, the paracoprids and telecoprids them were collected almost all weekly, making a total of 83 frequency and constancy may have been underestimated when samples (830 pats) collected in the two-year period. compared to those of endocoprids that remain in the dung The samples were placed in individual plastic containers pat. Oliveira et al. (1996), who used Pitfall traps baited with and taken to the Laboratório de Entomologia, Universidade dairy cattle dung near to stable in the same locality, presented Estadual de Campinas, located approximately 150 km data that support this assumption. Ontophagus buculus Southeast of São Carlos. A quarter of each of four dung pats, Mannerhein was the most frequent and constant species of adding to the equivalent of one dung pat, and a 5 cm layer the genus (Tables 1 and 2). Because it is absent or dispersed of its associated soil were transferred to Berlese funnels in other Brazilian localities, this beetle is not included among equipped with 40W light bulb where they were kept for fi ve to the important dung burying species (Flechtmann et al. 1995a, seven days or until the funnel content was dry. The remaining Marchiori et al. 2001). The Staphylinidae represented 30.4% three quarters of the four dung pats were kept individually in of the Coleoptera and was the most diverse family in number plastic containers covered with organza at room temperature. of species (Table 1). Oxytelus spp. represented 59.95% of this The other six pats were used to collect dung fl ies, and the family. The Histerids represented 3.9% of the Coleoptera, and results were presented elsewhere (Mendes & Linhares 2002). Hister curvatus Erichson and Euspilotus spp. represented The containers were checked daily for insect emergence. 99.3% of the 953 collected individuals (Table 1). After 30 to 40 days the extraction of the remaining The meteorological data from the collecting period Coleoptera and other arthropods within the pats was showed a drier and cooler period from April to September and done by dissolving the pats in water and collecting the a warmer and more humid period from October to March. In fl oating arthropods. All collected arthropods were kept in these periods the mean temperature varied respectively from 70% alcohol. Coleoptera were identifi ed with the help of 17oC to 22oC and from 22oC to 26oC. The monthly rainfall specialists and identifi cation keys, and by comparison with averages were 56 mm and 166 mm, varying from 0 to 120 material deposited at the Museu de Zoologia, Universidade mm and from 80 mm to 270 mm, respectively (details in de São Paulo (MZUSP). The collected species or genera were Mendes & Linhares 2002). classifi ed into trophic groups as proposed by Valiela (1974) In general, the Coleoptera were more frequent and and Cervenka & Moon (1991). Pearson correlation coeffi cient abundant in the warmer period (Figs. 1a-f, Table 2). The was used to test for correlations of abundance among exceptions were Cryptobium spp., N. nigrita, Phylonthus families, using the SAS PROC CORR procedure (SAS, fl avolimbatus Erichson and Cercyon spp that presented Inc 1987). Faunal indexes such as: Frequency, constancy, similar frequency and constancy in both year periods, and abundance and diversity of beetles collected during the drier Dibelonetes hybridus Erichson that was more frequent and cooler, and warmer and humid periods were presented, and constant in the cooler period (Figs. 1a,c; Table 2). The as well (Silveira Neto et al. 1976). species L. lividus, D. bos, Oxytelus sp.2 and H. curvatus were markedly more abundant in the warmer period (Figs. Results and Discussion 1a,b,d,e; Table 2). The correlation analysis did not evidence a signifi cant correlation among the Coleoptera families and The 24,332 collected Coleoptera belonged to 13 families between them and the Diptera families. However, signifi cant and to at least to 66 species (Table 1). The most abundant positive correlations were verifi ed between Scarabaeidae and diverse families were Aphodiidae, Staphylinidae and and Muscidae (+0.30; P < 0.006), Hydrophilidae and Scarabaeidae. Nearly all Staphylinidae were identifi ed at Scarabaeidae (+0.41; P < 0.0001), and Staphylinidae and least to genus, and half of the species were separated into Scarabaeidae (+30; P < 0.006). morphs.
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