作者: Lorenzo Quaglietta , Petra Hájková , António Mira , Luigi Boitani
DOI: 10.1007/S13364-015-0216-2
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摘要: Estimating animal population size is a critical task in both wildlife management and conservation biology. Precise unbiased estimates are nonetheless mostly difficult to obtain, as based on abundance over unit area frequently inflated due the “edge effect” bias. This may lead implementation of inappropriate decisions. In an attempt obtain accurate conservative possible picture Eurasian otter (Lutra lutra) numbers, we combined radio tracking data from subset tracked individuals extensive project ecology performed Southern Portugal with information stemming other sources, including trapping, carcasses, direct observation tagged untagged individuals, relatedness among genotyped minor contribution non-invasive genetic sampling. 158 km water network, which covers sampling 161 km2 corresponds minimum convex polygon constructed around locations five radio-tracked females, 21 animals were estimated exist. They included radio-tracked, reproducing females six adult males. Density varied one per 3.71–7.80 river length (one 7.09–14.36 km) 7.67–7.93 range, depending method scale analysis. Possible biases implications methods used for estimating density otters organisms living linear habitats highlighted, providing recommendations issue.