椭圆食粉螨种群消长动态及空间分布型研究

Population dynamics and spatial distribution pattern of Aleuroglyphus ovatus

目的研究椭圆食粉螨的种群消长动态及其在仓储面粉中的空间分布型,为椭圆食粉螨的有效监测和制定抽样调查计划提供基础资料。方法自2012年2月至2013年1月,调查芜湖市区4个采样点的面粉中椭圆食粉螨种群的季节消长情况。每月定点采样,进行椭圆食粉螨的鉴定及计数。运用扩散型指标、Iwao m*/回归方程及Taylor幂法则研究椭圆食粉螨种群在仓库面粉中的空间分布特征。结果椭圆食粉螨在芜湖仓储面粉中的高峰期出现在7月和9月。扩散型指标I>0,CA>0,m*/>1;同时利用Iwao线性回归方程m*=5.471+1.022(r=0.999)以及Taylor幂法则回归方程lg S2=0.697+1.111 lg(r=0.987)中的参数确定了椭圆食粉螨在仓储面粉中为聚集分布。结论椭圆食粉螨在芜湖市面粉中自然种群消长呈双峰型,其在仓储面粉中的空间格局为聚集分布。

Objective To characterize the population dynamics and spatial distribution of Aleuroglyphus ovatus in the flour warehouse,so as to provide the basic evidence for improving the sampling guidelines that are essential for effective pest monitoring and management. Methods The samples from flour warehouses of four localities were collected,examined and counted for A. ovatus in every month in Wuhu City. The dispersion pattern target,Iwao m＊/-x regression analysis and Taylor power method were used for analyzing the spatial distribution pattern of A. ovatus in the flour warehouses. Results The peaks of population dynamics of A. ovatus were discovered in July and September,respectively. The indexes of dispersion were as follows：I〉0, CA〉0,m＊/-x 〉1. At the same time,the parameters in the equation of Iwao：m＊=5.471＋1.022-x （r=0.999）and Taylor：lgS2=0.697＋1.111 lg-x （r=0.987）showed that the spatial distribution pattern of A. ovatus was assembled. Conclusion The peaks of population dynamics of A. ovatus in the flour warehouse are bimodal pattern ,and the spatial distribution pattern of A. ovatus is assembled.