关键词: 蜱螨亚纲, 毒厉螨, 纳氏厉螨, 空间格局, Iwao模型

Abstract: To illustrate the spatial pattern of Laelaps echidninus and Laelaps nuttalli (two important species of gamasid mites in the indoor and outdoor cultivated habitats in western Yunnan, China) among the individuals (point plots) of their dominant rodential hosts, Rattus flavipectus, Rattus norvegicus and Rattus nitidus, Iwao's regression model and the significance test of random deviation for the model were used.In the light of Iwao's model, tworegressionequations, M^※= 4.9985 + 3.0248M(α= 4.9985, β = 3.0428,r= 0.6979, P<0.05) for Laeleps echidninus and M^※= 2.9258 + 4.8130M (α= 2.9258, β = 4.8130, r =0.7767, P< 0.01） for Laeleps nuttalli were established.Both α and β in the equations were considerably higher than 0 or 1, the border values for determining spatial patterns of populations.The F values were 13.3256 (P< 0.01） for Lateleos echidninus and 10.1000 (P<0.01） for Laeleps nuttalli respectively in the significance test of random.The results proved that the spatial patterns of Laeleps echidninus and Laelaps nuttalli among the different individuals (poit plots) of their dominant hosts be aggregate distribution.