作者: M.W. Brown
关键词: Coccinella septempunctata 、 Harmonia axyridis 、 Coccinellidae 、 Chrysopidae 、 Ecology 、 Biology 、 Aphid 、 Animal ecology 、 Aphidoletes aphidimyza 、 Predator
摘要: The effects of the invasion ofan exotic predator, Harmonia axyridis(Pallas) (Coleoptera: Coccinellidae), wereinvestigated using three experiments on theecology aphid predators apple. Oneexperiment, 1992, was collected prior to theH. axyridis invasion, and two others,1996 1997 1999 2000, were collectedafter invasion. Except for one year, 1999,H. dominant coccinellid,replacing formerly Coccinellaseptempunctata L. Coccinellidae),another species. dominance H. greater among larvae thanamong adults. There no apparent effect ofthe abundance Aphidoletes aphidimyza(Rondani) (Diptera: Cecidomyiidae) apossible positive ofchrysopids (Neuroptera: Chrysopidae). Principal component analysis indicated thatalthough individual species affected, theoverall onthe predator guild as a whole negligible. data indicate that interaction betweenthe species, andC. septempunctata, may be allowing nativecoccinellids become more abundant applethan when C. septempunctata thedominant coccinellid.