title: Superparasitism in Cotesia glomerata does not benefit the host plant by reduction of herbivory caused by Pieris brassicae.
abstract: Superparasitism occurs in Cotesia glomerata L. (Hymenoptera: Braconidae), a gregarious endoparasitoid of Pieris spp. (Lepidoptera: Pieridae). The responses of Pieris brassicae L. larvae to superparasitism were examined in order to elucidate the ecological significance of this behaviour. Models of tritrophic interactions often imply that attraction of herbivore natural enemies by the plant constitutes a defence. Parasitoid attack on herbivores is assumed to result in a reduction in herbivory and or an increase in plant fitness. Coupled with the active involvement of the plant in producing signals, this can be seen as an indirect mediation of wound induced defence. The results show that superparasitism of P. brassicae by the parasitoid C. glomerata reduced survivorship but increased food consumption and weight growth in P. brassicae larvae. The duration of host larval development was found prolonged as the number of oviposition increased and superparasitized larvae (three to five time parasitized) grew slower than unparasitized larvae or larvae parasitized one or two times.
authors: Department of Plant Protection, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh 202002, India.
authors: Fazil
authors: F
authors: Hasan
authors: M Shafiq
authors: MS
authors: Ansari
keywords: Cotesia glomerata; Food consumption; Larval growth; Oviposition; Pieris brassicae; Plant fitness survivorship; Superparasitism
references: Proc Natl Acad Sci U S A. 1995 May 9;92(10):4169-74
references: 7753779
references: J Insect Physiol. 1997 Apr;43(4):407-424
references: 12769902
references: J Chem Ecol. 1994 Sep;20(9):2229-47
references: 24242803
references: J Chem Ecol. 1993 Mar;19(3):581-99
references: 24248958
references: Oecologia. 1995 Nov;104(3):308-315
references: 28307587
references: Proc Natl Acad Sci U S A. 1995 Mar 14;92(6):2036-40
references: 11607516
references: Annu Rev Entomol. 1990;35:59-79
references: 2405774
references: J Insect Physiol. 2001 Jun;47(6):573-584
references: 11249945
references: J Chem Ecol. 1993 Jan;19(1):47-59
references: 24248510
references: J Chem Ecol. 2005 Sep;31(9):2033-47
references: 16132211