瓜类主要害虫生态位研究及竞争群划分

研究了瓜类主要害虫的时间、空间营养、生态位及各害虫种间的竞争状况。结果表明：时间、空间、营养多维生态位宽度最大的最黄守瓜,其次是温室白粉虱和棉蚜。多维生态位重叠最大的朱砂叶螨和黄曲条跳甲,其次是假穴扭索螺与灰巴蜗牛。同时以时间、空间、营养多维生态位特征值为物种对环境资源利用的相似性指标,通过最短距离法聚类分析。将１０种主要害虫划分为三个竞争群和四个分离种。

Niche Study and Competition Guild Division of Main Insect Pests in Gourd Vegetables

Time,space and nutrition multidimensional niches of main insect pest in gourd vegetables and competition among the species of insect pests are studied.The results showed that the highest multidimensional niche width is found in Aulacophora femoralis chinensis (0 3050)and the second is found in Trialeurodes vapororiorum (0.2505)and Aphis gossypii (0 2218);The highest multidimensional niche overlaps are found in Tetranychus cinnabarinus and Phyllotreta striolata(0.6012), followed by Plectotropis pseudopatula and Bradybaena ravida (0.5795) The multidimensional niches characteristitic value of guilds were used as similarities index of environmental resources exploitation.The competition and exploitation of guilds to environmental resoruces is discussed.Three competition guilds and 2 isolated species were identified for 10 species of insect pests by the method of clustering analysis of the nearest distance.