Eficiência de armadilhas de queda (pitfall traps) em amostragens de anfíbios e répteis no Brasil

Revista Brasileira de Zoologia (Impact Factor: 0.54). 01/2000; 17(3). DOI: 10.1590/S0101-81752000000300017

ABSTRACT Effectiveness of pitfall traps for sampling amphibians and reptiles in Brazil. The etfectiveness 01' pittàll traps associated with drift fences to capture amphibians and reptiles in three field studies, in Rio Grande do Sul (extreme southern Brazil), São Paulo (São Paulo, southeastern Brazil), and Amazonas (Amazonas, northern Brazil) is described. At Santa Maria, a total of 2040 amphibians and reptiles were caught in 30 pitfalls (200 L, with drift fence) during 18 months ofstudy (capture efficiencies of 3.78 amphibians and reptiles/pitfall /month and 0.14 snake/pi-ttà ll/month). At Itirapina, São Paulo , 1262 amphibians and reptiles were obtained in 72 pittà ll s (100 L, with drift fence) during six l110nths (capture efficiencies of I 1,9 amphibians and reptiles/pitfall/month and 0,38 snake/pitfall/month). At Rio Pitinga, Amazonas, over 600 amphibians and reptiles were caught in 50 pittàlls (100-I 50 L, with drift fence) during three months (capture efticiencies ofca. 4.00 amphi bians and reptiles/pitfall/month and 0.87 snake/pittàll/month). Capture efficiencies of 1.25 to -3.92 amphibians and reptiles/pitfall/month were obtained in four other unpublished studies made by other authors in Brazi l, ali ofthem using 20-35 L traps, either with or without drift fences. Higher capture efficiencies for snakes were obtained in those studies in which larger containers (100-200 L) were used. The resuJts presented here indicate that pitfall traps are extremely useful to sall1 ple all1phibians and reptiles in Brazil, especially anurans and lizards. From these results, it is possible to preview the capture of 125 to 1200 all1phibians and reptiles with 100 pitfàlls during one 1l10nth, regardless ofthe size ofthe pitlàlls and sall1pling design ofthe trap arrays. The main advantages and disadvantages ofthc method and detai led guide lines on how to design, install , and use the traps is disc ussed. Armadilhas de interceptação e queda consistem de recipientes enterrados no solo (pitfalls) e interligados por cercas-guia (driftlences; CORN 1994). Quando um pequeno animal se depara com a cerca, geralmente a acompanha, até eventualmente cair no recipiente mais próximo. Estas armadilhas são amp lamente utilizadas para a amostragem de anfíbios, répteis e pequenos mamíferos (e.g. SEMLITSCH et aI. 1981; MENGAK & GUYNN 1987; WILLIAMS & BRAUN 1983). Uma das vantagens do método é a captu ra de animais que raramente são amostrados através dos métodos tradicionais que envo lvem procura visual (CAMPBELL & CHRISTMAN 1982).

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    11/2014; 10(1). DOI:10.15560/10.1.46
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    ABSTRACT: The biological diversity and ecological processes in Cerrado biome are still poorly understood. Herein we present information about anuran species of the municipality of Barro Alto, state of Goiás (Central Brazil). Five water bodies were sampled between the years 2007 and 2010 (October-March), three of them associated with forested area and two with open areas. We recorded 39 anuran species, characterized as open habitat specialists, forest habitat specialists and generalists. The rarefaction curve shows an asymptote formation, which demonstrates adequate effort and sampling techniques to assess the species richness of the region. Species richness was influenced by air humidity and temperature, since most of the species reproduce in the rainy season. We found significant differences in species composition between breeding sites in open and forested areas. The anurofauna in Cerrado seems to be formed from habitat's horizontal heterogeneity in space. Thus, contrasting habitats in space are important for maintaining the anuran richness, and therefore relevant in conservation terms.
    Iheringia Série Zoologia 01/2014; 104(1):50 - 58. DOI:10.1590/1678-4766201410415058 · 0.51 Impact Factor
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    ABSTRACT: This work was carried out with the main objective of sampling the herpetofauna of a Cerrado site in the state of Piauí, Brazil, that is influenced by neighboring biomes and one of the least known regions of the domain. The herpetofauna of the different habitats present at Estação Ecológica de Uruçuí-Una (EEUU) was sampled intensively during three campaigns (two during the wet season and one during the dry season). We recorded 90 species, 64 reptiles and 26 anurans, a high local richness when compared to other well-sampled localities of the Cerrado. The rarefaction curve for both anurans and lizards shows that the observed richness is close to real and the richness estimators indicate that undetected species should be added with higher sampling effort. Analysis of co-occurrence shows that the species are not randomly distributed in the landscape, indicating that they use preferentially particular types of habitat. Despite being located in a transitional area and influenced by neighboring biomes, the cluster analysis of similarity suggests that the herpetofauna of the EEUU is typical of the Cerrado. Thereby, the results of this study indicate that the EEUU presents a rich herpetofauna that plays an important role in the conservation of a regional faunistic pool.
    Papeis Avulsos de Zoologia 06/2013; 53(16):225-243. DOI:10.1590/S0031-10492013001600001


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