期刊
ECOLOGICAL RESEARCH
卷 27, 期 3, 页码 639-648出版社
WILEY
DOI: 10.1007/s11284-012-0938-4
关键词
Camera-trapping; Closed mark-recapture models; Population density; Panthera onca; Relative abundance
类别
资金
- Jaguar Conservation Fund
- Ideawild
- Center for Knowledge in Tropical Biodiversity
- Fundacao para a Ciencia e Tecnologia (FCT-MCT) [SRFH/BD/23894/2005]
Camera trapping has become a popular technique to monitor carnivore populations due to its usefulness in estimating abundance. Nevertheless, there are a number of problems associated with study design which are motivating researchers to search for a compromise that ensures improvement of precision while being cost-effective. We have used data from a capture-recapture study in a forested area in central Brazil to evaluate the effectiveness of using one versus two cameras per trapping station for determining jaguar () density and capture rates of several other mammals. The capture rate for the jaguar and other species recorded with only one camera was lower than that with two cameras. The number of jaguars identified using photos from one camera ranged between six and seven animals, but reached ten individuals when two-camera sets were used where pictures of both flanks could be positively individualized. These differences, combined with different estimates of effective sampled area size, resulted in jaguar densities estimates ranging from 2.18 to 5.40 and 3.99 individuals/100 km(2) when one and two cameras were used per station, respectively (using the half-MMDM and Heterogeneity model). Based on our results, we recommend the use of two cameras per station for jaguar density monitoring to ensure reasonable levels of reliability and accuracy of estimates despite a small sample size.
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