Rythmes d'activité locomotrice chez deux insectes parasitoïdes sympatriques : Eupelmus orientalis et Eupelmus vuilleti (Hyménoptère, Eupelmidae)

Abstract

With an automatic image analysis device, we studied the temporal distribution of the locomotor activity of E. orientalis and E. vuilleti during 24 h, and over several days to know whether the activity rhythms of these two Eupelmidae play a role in their competitive interactions. The analysis of locomotor activity rhythms of E. orientalis and E. vuilleti shows that the locomotor activity of both species presents daily cyclic variations. These two Eupelmidae have similar activity rhythms. Displacements of these parasitoids essentially take place during the photophase. But the activity of E. vuilleti is earlier, because the individuals of this species start their activity on average 4 to 5 h earlier than those of E. orientalis. E. vuilleti begins its displacements several hours before the onset of lighting, whereas E. orientalis is active only in the presence of the light. This shift of starting activity is thus a factor allowing these concurrent species to minimize their interactions during the cohabitation period in traditional granaries after the harvests of cowpea.

The effects of LED daylength extensions on the fecundity of the pest aphidMyzus persicaeand the daily activity patterns of its parasitoid,Aphidius matricariae

“…We found that female A. matricariae were more active than males under the photoperiod experiment, which is similar to previous findings in A. gifuensis (Abe et al, 2014). We also found male activity consistently peaked earlier in the day than female activity, similarly to some other parasitoid species (Bertossa et al, 2013;Ndoutoume-Ndong et al, 2006;Pompanon et al, 1999). More notably, we found that males, but not females, were sensitive to the spectral quality when determining their peak locomotor activity time under extended days.…”

Reproductive Capacities and Development of a Seed Bruchid Beetle,Acanthoscelides macrophthalmus, a Potential Host for the Mass Rearing of the Parasitoid,Dinarmus basalis

“…Any rearing of A. macrophthalmus for mass production of D. basalis should necessarily take into account this age class factor. The estimated growth parameters of A. macrophthalmus are close to those reported by Ndoutoume ( 1996 ) for C. maculatus under control conditions similar to those of our climatic zone, which leads to the third rationale for the importance of this wild bruchid for mass rearing of the parasitoid D. basalis .…”

Endogenous locomotor activity rhythm of two sympatric species of Talitrids (Crustacea, Amphipoda) from the supralittoral zone of Bizerte lagoon (Northern Tunisia)

“…The absence of overlap between temporal niches of these species suggests an adaptative strategy in order to reduce interspecific competition. Ndoutoume-Ndong et al (2006) showed that the two parasitoid insects, Eupelmus orientalis and Eupelmus vuilleti, have similar activity rhythm, their displacements took place essentially during the photophase but the activity of E. Vuilleti is earlier than E. Orientalis. This shift of starting activity was thus a factor allowing these concurrent species to minimize their interaction during the cohabitation period in traditional granaries after the harvests of cowpea.…”