### Comparison of the Tibetan fox (Vulpes ferrilata) home range size using methods the fixed kernel estimation and the minimum convex polygon

LIU Xiaoqing,WANG Xiaoming,WANG Zhenghuan,LIU Qunxiu,MA Bo

1. School of Life Sciences,East China Normal University,Shanghai 200062,China
• Online:2010-05-27 Published:2010-03-02

### 固定核空间法和最小凸多边形法估计藏狐家域的比较

1. (华东师范大学生命科学学院,上海 200062

Abstract: The minimum convex polygon (MCP)and the fixed kernel estimator (FKE)are the two methods most used for
home range estimation. However,because of the problems like spatial data dependence and extreme data points,the usage of these two methods is limited. In this paper,we attempted to analyze and compare the results from these two methods, and discuss how to avoid the disadvantages of each method to make the home range estimation more accurate. We documented 352 locations of 7 adult Tibetan foxes (Vulpes ferrilata) in Shiqu County,Sichuan Province and Dulan County,Qinghai Province during 2006 and 2007. Both MCP and FKE were used to calculate the home range. We found:(1)when the utility probability percentage was set ≤95% ,the difference of the home range size calculated by these two methods had no significant difference;(2)although FKE was more robust than MCP,extreme data points influenced the calculation of both the two methods in higher utilization probability percentage (i. e.,85% - 100% ); (3)home range size calculated by FKE was influenced significantly by the setting of smoothing parameter h which could be determined arbitrarily and the least squares cross validation did not always provide the best evaluation of h. We recommended that both of the FKE and 95% MCP should be used in the same home range study. FKE can be the better home range estimator when the autocorrelation of data spatial distribution is not significant. However,95% MCP can be the only choice especially when the comparison of the results from different telemetry studies is needed.