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首页> 外文期刊>South African Journal of Wildlife Research >Estimating forest duiker (Cephalophinae) density in Korup National Park: a case study on the performance of three line transect methods
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Estimating forest duiker (Cephalophinae) density in Korup National Park: a case study on the performance of three line transect methods

机译：估计科鲁普国家公园的森林杜鹃（Cephalophinae）密度：以三线样线方法的性能为例

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摘要

Forest duikers (Cephalophinae) are important targets of the bushmeat trade but a reliable and efficient assessment of these shy animals is often regarded as problematic. Using a power analysis approach, we assessed the performance of three established methods (diurnal, nocturnal and indirect dung surveys) in producing density estimates for the blue and the Ogilby's duiker (Cephalophus monticola, Cephalophus ogilbyi ogilbyi) in a 16 km(2) section of primary forest, systematically sampled using line transects. Direct survey methods (diurnal and nocturnal) yielded density estimates between 8.3 and 6.8 (blue duiker) and 6.5 and 4.3 animals/ km(2) (Ogilby's). The coefficients of variation of density estimates implied a resolution of 44% density change detectable in diurnal surveys but only of 140% in nocturnal surveys. Density estimates derived from the dung survey were lower than those of direct surveys (1.5 animals/ km(2) and 1.4 animals/ km(2), respectively). Associated coefficients of variation imply a resolution of change in density estimates detectable for changes far larger than 100%. However, dung pile density was susceptible to variation in key parameters (decay and production rates) and difficulties in data acquisition lead us to reject the dung survey as a suitable method in our particular setting. Our results suggest that diurnal direct surveying from line transects can be reliable and effective even for shy forest ungulates under (some) hunting pressure.
机译：森林矮人（Cephalophinae）是丛林肉贸易的重要目标，但是对这些害羞动物的可靠而有效的评估通常被认为是有问题的。使用功率分析方法，我们在16 km（2）区域中评估了三种既定方法（昼夜调查，夜间粪便调查和间接粪便调查）的性能，以评估蓝色和Ogilby duiker（Cephalophus monticola，Cephalophus ogilbyi ogilbyi）的密度原始森林的数量，使用线样线系统地采样。直接调查方法（日间和夜间）得出的密度估计值在8.3至6.8（蓝色杜克犬）与6.5至4.3动物/公里（2）之间（奥吉比）。密度估计值的变异系数意味着在日间调查中可以检测到44％的密度变化，而在夜间调查中只有140％的分辨率。粪便调查得出的密度估计值低于直接调查得出的密度估计值（分别为1.5动物/平方公里（2）和1.4动物/平方公里（2））。关联的变异系数意味着可以检测到远大于100％的变化的密度估计值的变化分辨率。但是，粪堆密度容易受到关键参数（衰变和生产率）变化的影响，并且由于数据采集的困难，我们拒绝了将粪便调查作为适合我们特定环境的合适方法。我们的结果表明，即使对于（某些）狩猎压力下的害羞的有蹄类动物，线样的昼间直接调查也可能是可靠且有效的。

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