...
首页> 外文期刊>Journal of Wildlife Management >Estimation of regional sheep abundance based on group sizes
【24h】

Estimation of regional sheep abundance based on group sizes

机译:基于群体规模的区域绵羊数量估算

获取原文
获取原文并翻译 | 示例
           

摘要

We used sightability models with aerial counts to estimate regional abundance of desert bighorn sheep (Ovis canadensis) in southwestern Arizona during 1992-2012. Because of incomplete spatial and temporal coverage of surveys, we integrated sightability estimates using Bayesian state-space models. Although some game management units (GMUs) exhibited negative average growth rates during this period, temporal variability in growth was large. The combination of temporal variability and statistical uncertainty in the sightability estimates led to the selection of a regional model having zero mean growth from initial abundance. Hence, the model indicated a relatively stable population of desert bighorn sheep in southern Arizona, beginning with approximately 2,900 bighorn sheep in 1992 to the current number of approximately 2,300 sheep (2012). Our method provides statistically valid estimates of overall regional abundance not otherwise possible given the incomplete spatial coverage of surveys. Additionally, results have implications for other studies, common in wildlife management, where managers seek to integrate information across surveys with partial time-series
机译:我们使用具有航空计数的可见性模型来估计1992-2012年亚利桑那州西南部沙漠大角羊(Ovis canadensis)的区域丰度。由于调查的时空覆盖不完整,因此我们使用贝叶斯状态空间模型整合了可见度估算。尽管在此期间某些游戏管理单位(GMU)的平均增长率为负,但增长的时间变化很大。可见性估计中时间变异性和统计不确定性的结合导致选择区域模型,该模型的初始丰度为零。因此,该模型表明,亚利桑那州南部的沙漠大角羊种群相对稳定,从1992年的约2,900只大角羊开始,到目前的约2,300只羊(2012年)。考虑到调查的空间覆盖不完整,我们的方法提供了对整个区域丰度的统计有效估计,否则就不可能实现。此外,结果对野生动植物管理中常见的其他研究也有影响,在这些研究中,管理人员寻求将部分时间序列的调查信息整合在一起

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号