鸡冠刺桐叶片上刺桐姬小蜂虫瘿的分布规律.pdfVIP

第29卷第3期 华南农业大学学报 Vo1．29，No．3 2008年7月 Journal of South China Agricuhural University Ju1．2008 鸡冠刺桐叶片上刺桐姬小蜂虫瘿的分布规律 邓晓韶，曾 玲，陆永跃，梁广文 (华南农业大学昆虫生态研究室，广东广州5106422) 摘要：为研究刺桐姬小蜂在刺桐叶片上产卵危害及虫瘿分布特点，调查了鸡冠刺桐Er)~hrina cristagalli L．叶片上刺 桐姬小蜂Quadrastichus erythrinae Kim虫瘿的数量和空间分布规律．结果表明，叶片上虫瘿主要分布于近叶柄处主 脉两侧中下部区域，单个和2个虫瘿团的形式出现频次高于50％，以1—15个虫瘿团形式出现的虫瘿数量是相近 的；鸡冠刺桐叶片上刺桐姬小蜂虫瘿呈聚集分布，且聚集程度较强，其分布形式符合负二项分布，分布的基本成分 为个体群，且个体群大小随着虫瘿密度的变化呈幂方程形式增大，平均为10．9个；虫瘿聚集程度具有密度依赖性， 即随着虫瘿密度增大，聚集强度也增大．虫瘿由均匀型格局向聚集型格局相互转化过程中聚集临界密度为每叶 22 8个 关键词：刺桐姬小蜂；鸡冠刺桐；叶片；虫瘿；空间分布 中图分类号：Q968．1 文献标识码：A 文章编号：1001·411X(2008)03·0029·04 Distribution of Galls Induced by Quadrastichus erythrinae on Erythrina cristagalli Leaf DENG Xiao-shao，ZENG Ling，LU Yong-yue，LIANG Guang-wen (Lab of Insect Ecology，South China Agricultural University，Guangzhou 510642，China) Abstract：Quantitative and spatial distributions of Quadrastichus erythrinae Kim galls on Erythrina crista- galli L．mature leaves were investigated and analysed by the distribution parameters in the paper．The re— suhs indicated that：(1)the frequency of the galls at the parts beside the main vein near the petiole was more than 50％on erythrina leaf；(2)the probability of the gall appearing in one and two-galls group in galls was over 50％and the gall quantities in 1—15一galls groups were similar；(3)the spatial distribu- tion of the galls on leaves was aggregating based on the spatial pattern parameters，and its basic element for distribution was clusters of individuals in which the clusters of individuals increased with the gall den- sity；(4)the aggregation degree was dependent