The usefulness of different methods for biodiversity surveys in the Amazonia/Cerrado ecotone
Resumen
Small mammals and herpetofauna were surveyed in the Amazonia/Cerrado ecotone and the capture effectiveness in terms of capture rates and species richness of live traps (Sherman and Tomahawk) and pitfalls (30 L and 60 L) was compared. We also evaluated if these methods alone could accurately estimate local species richness, by using additional methods. Sixty-five small vertebrate species were captured, 29 amphibian, 18 lizard and 18 small mammal species. Larger pitfalls captured significantly more individuals than the smaller ones, but did not capture more species of any taxonomic group. When comparing live traps, sherman traps captured significantly more cricetids, while Tomahawk traps captured more didelphids and teiids. Pitfalls captured significantly more small mammal species than live traps. Pitfalls were the less selective method and reveal to be very useful even in short-term biodiversity surveys. Additional sampling methods substantially increased the number of recorded species, mostly herpetofauna. A combination of pitfalls and live traps is adequate for sampling small mammals in the ecotone but is be insufficient for herpetofauna. Additionally, we present the relative costs and effort associated with each method and discuss their merits and drawbacks.
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