Estimating Primate Densities from Transects in a West African Rain Forest: A Comparison of Techniques
Estimating Primate Densities from Transects in a West African Rain Forest: A Comparison of Techniques
复制标题
从西非雨林横断面估算灵长类动物密度：技术比较
DOI：
--
复制
发表时间：
1988
期刊：
影响因子：
--
通讯作者：
R. Kluberdanz
中科院分区：
文献类型：
--
作者：
George H. Whitesides;J. Oates;S. M. Green;R. Kluberdanz
(1)采用2种样带调查技术和5种分析方法，对西非塞拉利昂提瓦岛7种昼夜活动灵长类物种的群落密度进行了评估。(2)对28个单观测者样带样本(每个样带长6公里)的数据采用了一种改进的标准物种特有带宽估计技术。(3)第二种方法采用17个扫描样本，其中3个观测者同时走平行样线，间隔100m，长1公里。这种方法同时使用目击和发声定位来进行密度估计。(4)第三种方法通过将扫描样本的目测率和密度纳入校正因子，将单观测者样本的目测率转换为密度估计。(5)我们使用了关于栖息地大小和重叠的长期数据来估计我们有足够数据的三个物种的密度。(6)第五种方法采用了Hayes&Buckland(1983)的危险率模型，该模型将到第一个目击个体的距离估计转换为到群体中心的距离估计。(7)除扫描样方方法外，所有分析技术得到的密度估计值按物种的排序是相同的。我们发现不同分析方法产生的密度估计值之间没有显著差异，除了扫描样本产生的戴安娜象甲密度。(8)我们建议使用相对较长的单横断面样本和更局部化的多观测者扫描样本。这些技术允许使用各种分析方法。
(1) We used two line-transect survey techniques and five analytical methods to assess the densities of social groups of seven diurnal primate species resident on Tiwai Island, Sierra Leone, West Africa. (2) A modified standard species-specific strip-width estimation technique was applied to data from twenty-eight single-observer transect samples, each 6 km in length. (3) The second method employed seventeen sweep samples where three observers simultaneously walked parallel transects 100 m apart and 1 km in length. This method used both sightings and localization of vocalizations for density estimation. (4) The third method transformed sighting rates from the single-observer samples into density estimates by incorporating sighting rates and densities from sweep samples into calibration factors. (5) We used long-term data on home-range size and overlap to estimate density for three species for which we had sufficient data. (6) The fifth method employed the hazard-rate model of Hayes & Buckland (1983) which involved transforming estimates of distance to the first sighted individual into estimates of distance to the group centre. (7) The rank orders by species of density estimates produced by all analytical techniques were identical except for the sweep-quadrat method. We found no significant differences among density estimates produced by different analytical methods, except for the C. diana density produced by the sweep samples. (8) We recommend the use of both relatively long single-transect samples and also more localized multi-observer sweep samples. These techniques allow use of a variety of analytical methods.