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

Abstract

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/pittà 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 Capture efficiencies of 1.25 to -3.92 amphibians and reptiles/pitfall/month were obtained in four other unpublished studies made by other authors in Brazi l, ali ofthem using 20-35 L traps, either with or without drift fences.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.

Seasonality, age structure and reproduction of Leptodactylus (Lithodytes) lineatus (Anura, Leptodactylidae) in Rondônia state, southwestern Amazon, Brazil

“…Without the use of pitfall traps, we would have only recorded a total of four individuals. Pitfall traps are an efficient technique to detect some species that may not be detected by other methods very often (CECHIN & MARTINS, 2000). The results of our study indicate that this is the case for the leaf litter frog L. (L.) lineatus.…”

Diversidade local e influência da sazonalidade sobre taxocenoses de anfíbios e répteis na Reserva Extrativista Chico Mendes, Acre, Brasil

“…As amostragens foram realizadas empregando os métodos de procura limitada por tempo e armadilhas de interceptação e queda (Campbell & Christman, 1982;Cechin & Martins, 2000). Foram percorridas trilhas de 300 a 400 m durante um período de quatro horas por noite e trilhas de 150 a 200 m durante duas horas pela manhã.…”

Composição e riqueza de anfíbios anuros em remanescentes de Cerrado do Brasil Central

“…Desta forma, nossos dados confirmam que as amostragens realizadas nos sítios reprodutivos são eficientes, pois a ecologia reprodutiva da maioria de anuros registrados os torna dependentes de corpos d'água lênticos ou lóticos (santos et al, 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. CaraMasChi, 2010;PoMBal et al, 2011), bem como a compreensão dos padrões regionais de riqueza das espécies (ValdUjo et al, 2011).…”