孪斑唇瓢虫成虫对桑白蚧的捕食功能
Predatory function of adults of Chilocorus geminus to Pseudaulacapis pentagona
魏治钢1**赵莉1***杨森2
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作者单位：1新疆农业大学农学院乌鲁木齐830052； 2新疆农业科学院植保所乌鲁木齐830091
中文关键词：
英文关键词：
中文摘要：
摘要在实验室条件下，研究孪斑唇瓢虫Chilocorus geminus Zaslavskij成虫对桑白蚧Pseudaulacaspis pentagona(TargioniTozzetti)各虫态的捕食功能反应，寻找效应和干扰效应。结果表明，孪斑唇瓢虫成虫对桑白蚧各虫态的功能反应均符合HollingⅡ型圆盘方程。孪斑唇瓢虫成虫对桑白蚧各虫态的寻找效应随自身密度的增加而降低。根据HollingⅢ型功能反应新模型拟合出1头孪斑唇瓢虫成虫对桑白蚧各虫态的最佳寻找密度分别为：成虫267头、卵185.2粒、1龄若虫47.9头、2龄若虫46.8头。当孪斑唇瓢虫成虫与桑白蚧各虫态的数量同比例增加时，孪斑唇瓢虫成虫个体间的相互干扰系数为0.3901，0.7891和0.9827；当桑白蚧2龄若虫数量不变而孪斑唇瓢虫成虫数量增加时，孪斑唇瓢虫成虫个体间的相互干扰系数为0.0960。
关键词孪斑唇瓢虫， 桑白蚧， 捕食功能， 干扰效应， 寻找效应
英文摘要：
The predatory function, searching efficiency and mutual interference effect of adults of Chilocorus geminus Zaslavskij to Pseudaulacaspis pentagona (TargoniTozzetti) in different stage were studied in the laboratory under natural temperature. The results showed that the functional response models of C. geminus adults belonged to Holling-Ⅱtype in all stages of P. pentagona. The searching efficiency of C. geminus adults decreased with the increasing of the density of P. pentagona. The optimal seeking density of one adult estimated based on Holling-Ⅲ formula was 26.7 (adults), 185.2 (eggs), 47.9 (1st instar nymphs) and 46.8 (2nd instar nymphs), respectively. When the number of C. geminus adults and P. pentagona proportionally increased, the interaction coefficients among the adults were 0.3901, 0.7891, and 0.9827. When the number of 2nd instar nymphs of P. pentagona was constant and the number of C. geminus adults number increased, the interaction coefficient among adults was 0.0960.
Key wordsChilocorus geminus, Pseudaulacaspis pentagona, predatory functional response, mutual interference, searching efficiency