Resumo

WALKER, R. Susan; NOVARO, Andrés J.  e  PEROVIC, Pablo G.. Comparison of two methods for estimation of abundance of mountain vizcachas (Lagidium viscacia) based on direct counts. Mastozool. neotrop. [online]. 2008, vol.15, n.1, pp.135-140. ISSN 0327-9383.

Mountain vizcachas (genus Lagidium) are large, rock-dwelling rodents of the Andes and the Patagonian steppe. We tested the bounded count and double observer methods for estimating mountain vizcacha population size. Estimates obtained with these two count-based methods and a Lincoln-Petersen mark-resight estimate were similar. However, estimates obtained with the double observer method were the most precise, and the method is easy to use and practical. We recommend the use of the double observer method because it incorporates an estimate of detection probability that reduces bias and allows comparisons between sites and across time.

Palavras-chave : Bounded counts; Detection probability; Double observer; Mark-resight; Population estimation.

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