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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.17 no.2 Curitiba June 2000

http://dx.doi.org/10.1590/S0101-81752000000200022 

Bats from Fazenda Intervales, Southeastern Brazil - species account and comparison between different sampling methods

 

 

Christine V. PortforsI; M. Brock FentonII,*; Ludmilla M. de S. AguiarIII; Julio E. BaumgartenIV; Maarten J. VonhofII; Sylvie BouchardII; Deborah M. de FariaIV; Wagner A. PedroV; Naas I. L. RauntenbachVI; Marlon ZorteaVII

IDepartment of Neurobiology, Northeastern Ohio Universities College of Medicine. 4209, State Route 44, P.O. Box 95, Rootstown, Ohio 44272-0095, USA
IIDepartment of Biology, York University. North York, Ontario, M3J 1P3, Canada
IIIDepartamento de Ecologia, Universidade de Brasília. Caixa Postal 04474, 70919-970 Brasília, Distrito Federal, Brasil
IVDepartamento de Zoologia, Universidade Estadual de Campinas. Caixa Postal 6109, 13083-970 Campinas, São Paulo, Brasil
VDepartamento de Apoio, Produção e Saúde Animal, Universidade Estadual Paulista. Caixa Postal 341, 16050-680 Araçatuba, São Paulo, Brasil
VITransvaal Museum, P.O. Box 413, Pretoria, South Africa
VIIPrograma de Pós-graduação em Ecologia e Recursos Naturais, Universidade Federal de São Carlos. Caixa Postal 676, 13565-905 São Carlos, São Paulo, Brasil

 

 


ABSTRACT

Assessing the composition of an area's bat fauna is typically accomplished by using captures or by monitoring echolocation calls with bat detectors. The two methods may not provide the same data regarding species composition. Mist nets and harp traps may be biased towards sampling low flying species, and bat detectors biased towards detecting high intensity echolocators. A comparison of the bat fauna of Fazenda Intervales, southeastern Brazil, as revealed by mist nets and harp trap captures, checking roosts and by monitoring echolocation calls of flying bats illustrates this point. A total of 17 species of bats was sampled. Fourteen bat species were captured and the echolocation calls of 12 species were recorded, three of them not revealed by mist nets or harp traps. The different sampling methods provided different pictures of the bat fauna. Phyllostomid bats dominated the catches in mist nets, but in the field their echolocation calls were never detected. No single sampling approach provided a complete assessment of the bat fauna in the study area. In general, bats producing low intensity echolocation calls, such as phyllostomids, are more easily assessed by netting, and bats producing high intensity echolocation calls are better surveyed by bat detectors. The results demonstrate that a combined and varied approach to sampling is required for a complete assessment of the bat fauna of an area.

Key words: Atlantic rain forest, bats, bat detector, chiroptera, diversity, echolocation, sampling methods, southeastern Brazil.


 

 

Full text available only in PDF format.

Texto completo disponível apenas em PDF.

 

 

ACKNOWLEDGEMENTS. We thank E. Trajano for making the arrangements for working at Fazenda Intervales. R.M. Brigham, D.A. Blankenship, C.D. Grose and E.R. Dumont for reading earlier drafts of this manuscript and making suggestions for its improvement. This study was supported by a Natural Sciences and Engineering Research Council of Canada research grant to MBF.

 

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Recebido em 10.VI.199; aceito em 09.V.2000.

 

 

* Corresponding author: E-mail: bfenton@yorku.ca

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