Cechin, S.Z., and M. Martins. Eficiência de armadilhas de queda (pitfall traps) em amostragens de anfíbios e répteis no Brasil. Revista Brasileira de Zoologia

Revista Brasileira de Zoologia (Impact Factor: 0.54). 09/2000; 17(3). DOI: 10.1590/S0101-81752000000300017


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 Capture efficiencies of 1.25 to -3.92 amphibians and reptiles/pitfall/month were obtained in four other unpublished studies made by other authors in Brazi l, ali ofthem using 20-35 L traps, either with or without drift fences.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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    • "Small flightless arthropods and rodents are also not comparable in vagility and home range (Roshier et al., 2008; Alcock, 2013; Hillman et al., 2014). Furthermore, the size and presence of drift fences may also influence in the capturing probabilities (e.g., Cechin and Martins, 2000). As a result, we expect that in the near future this model could be improved adding more variables, both from drift fence morphology, and those from the environment and from target species natural history. "
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    ABSTRACT: Biodiversity inventories well acknowledge as key to conservation planning. One widely used method for sampling terrestrial fauna is traps with drift fences. Such drift fences, however, may be configured in several arrays, varying the height, length of the fence, space between conjugated traps (e.g., buckets or funnels), and it can be arranged in linear (I) or radial (Y) formats. Consequently, some criticism arose questioning which drift fence arrangement should be employed. Therefore, we made use of geometrical models to test the probability of capturing terrestrial tetrapods (as model organisms) using traps associated along with both I and Y drift fence arrays. With distances varying from 8 to 100 m from the fence, the capturing rate of the I format was in average 1.16 times higher than the Y format. Besides this, we also present data that may enable field ecologists to better decide the minimum distance between two traps with drift fences, ensuring accurate statistics. Correct decisions in ecological and management studies may prevent wastes and fundament efficient conservation policies.
    Natureza & conservaç~ao revista brasileira de conservaç~ao da natureza 05/2015; 37(1). DOI:10.1016/j.ncon.2015.05.002 · 1.33 Impact Factor
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    • "Lizard species were sampled over 16 collection days in September 2011 (dry season), using three sampling methods: diurnal and nocturnal visual searches; interception and one meter deep pitfall traps (Cechin and Martins 2000; Ribeiro-Jr et al. 2008); and incidental collections (Sawaya et al. 2008). Diurnal and nocturnal visual searches consisted of a researcher walking slowly along the trails, looking for specimens. "
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    ABSTRACT: The present study reports an inventory of lizard species from a region at the central Jatapú River located in the state of Amazonas, Brazil. The lizard fauna was surveyed using three sampling methods: diurnal and nocturnal visual search, pitfall traps with drift fences, and incidental collections. We recorded 24 lizard species belonging to 18 genera and eight families. Non-parametric estimators of richness (Bootstrap, Chao 2, Jackknife 1, Ace) were used to estimate the percentage of total richness sampled. Expected species richness varied from 27 species estimated via Bootstrap to 30 species with Jackknife 1. The composition of the lizard fauna encountered in the rio Jatapú plot was compared with seven other published surveys carried out in the region of the Brazilian Guiana Shield. The composition of the Jatapú lizard fauna was most similar to FLOTA Faro (84%) and least similar to ESEC Grão-Pará Center (66%). There was no association between faunal similarity and geographic distance. The present species list contributes to our knowledge of lizards of the southern portion of the Guiana Shield in Brazil.
    Check List 11/2014; 10(1). DOI:10.15560/10.1.46
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    • ", 2007 ) . Adicionalmente , estudos a longo prazo e amostragens em diferentes tipos de ambientes resultam em uma melhor estimativa da riqueza total de uma determinada área ( CeChin & Martins , 2000 ) , favorecendo a ampliação de distribuição de alguns táxons e descoberta de novas espécies ( e . g . "
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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 · 0.57 Impact Factor
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