种群分布格局总体上呈聚集型，随年龄增加聚集强度增加。
The population pattern was of clustered distribution, with the aggregating intensity increased with age.
方差分析表明该种群的聚集强度在树冠的上、下部间差异显著。
Variance analyses indicate the cluster intensity of this population is significant difference between the upper and lower crowns of citrus trees.
棘头虫种群在宿主不同体长组的分布类型为聚集分布，且聚集强度随棘头虫的种群平均丰度增加而增加。
The over-dispersion of the acanthocephalan population in host different body length groups was found, and the degree of the aggregation increases with the increases of mean abundance.
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