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动物的分布有三种模式:1)随机,2)均匀,和3)聚集。在多数情况下,也包括贝类宿主,第3种的分布模式见于野外现场。在控制措施的前后,要可靠地比较螺蛳的密度是有一定的难度,因为贝类宿主在疫区常呈上述不规则的聚集分布。 我们在菲律宾对夸氏钉螺(Oncomelania quadrasi)贝类宿主群体的分希模式进行了分析。结果显示符合上述第3种聚集分布的模式,尤其符合负二项式,表明该贝类宿主在疫区呈成群的分布。在这种分布的特点下比较螺蛳密度时,我们不能采用实际螺蛳的个数作统计分析,因为偏差的稳定性达不到统计学的显著性检验,如
There are three modes of animal distribution: 1) Random, 2) Even, and 3) Aggregation. In most cases, shellfish hosts are also included, and the distribution pattern for species 3 is found in the field. Before and after the control measures, it is difficult to reliably compare the density of snails because the shellfish hosts often have the above-mentioned irregular aggregation distribution in the affected areas. In the Philippines, we analyzed the branching patterns of the Oncomelania quadrasi shellfish host population. The results show that the patterns consistent with the above-mentioned type 3 aggregation distribution, especially the negative binomial, indicate that the shellfish hosts are clustered in the affected areas. When comparing the snail density with this distribution, we can not use the actual number of snails for statistical analysis because the stability of the deviation does not reach the statistical significance test. For example,