中国生态农业学报Issue(7)：914-918,5.DOI:10.13930/j.cnki.cjea.141502
阿尔蚜茧蜂对不同龄期豌豆蚜的寄生及后代适合度研究
Parasitism and offspring fitness of Aphidius ervi Haliday in relation to its host Acyrthosphon pisum Harris at different stages
摘要
Abstract
Pea aphid [Acyrthosiphon pisum (Harris)] at different growth stages were used to explore the host stage preference of Aphidius ervi Haliday to pea aphid and the effect of host-stage parasitism on parasitoid offspring fitness at (24±1) ℃. The results suggested that the host stage of pea aphid had a significant (P < 0.05) influence on the parasitic behavior and fitness of A. ervi offspring. Although A. ervi parasitized on all the stages of pea aphid, the parasitic rate of A. ervi in the 2nd instar aphids was highest (56.67%). This was followed by the parasitic rate in the 1st instar aphids (30.67%) and the 4th instar nymphs, while that in the adults was least. The eclosion rate of offspring of A. ervi was significantly higher in young nymphs than in older hosts. The duration of offspring wasp was longest in the 1st instar aphids. The duration from egg release to mummy appearance of A. ervi in the 1st instar aphids was 9.47 d and that from mummy appearance to eclosion was 5.51 d, which gradually shortened with increasing host stage. The duration of offspring development was longest in the 1st instar aphids (14.85 d) and shortest in adults (7.87 d). The proportion of female offspring of A. ervi was significantly greater in adults (57.33%) than in 1st instar (24.52%). Meanwhile, emerging adult size of offspring increased with increasing host stage (or body size). Host stage (or body size) was positively correlated with parasitoidoffspring fitness. From offspring fitness measures, A. ervi females preferred to parasitize in older aphids for higher fitness return despite the risk of lower parasitic rate trade-off. The results suggested that host stage (or body size) significantly influenced parasitic selection of A. ervi and offspring fitness.关键词
豌豆蚜/阿尔蚜茧蜂/寄主龄期/后代适合度/寄生率/容性寄生蜂Key words
Pea aphid [Acyrthosiphon pisum (Harris)]/Aphidius ervi Haliday/Host stage/Offspring fitness/Parasitic rate/Koinobiont分类
农业科技引用本文复制引用
张廷伟,黄纯倩,杜军利,刘长仲..阿尔蚜茧蜂对不同龄期豌豆蚜的寄生及后代适合度研究[J].中国生态农业学报,2015,(7):914-918,5.基金项目
高等学校博士学科点专项科研基金博导类课题(20136202110007)和国家自然科学基金项目(31260433)资助 （20136202110007）
