The Absence of Interspecific Host Discrimination in Asobara Tabida Nees and Leptopilina Heterotoma (Thomson), Coexisting Larval Parasitoids of Drosophila Species

1980 ◽  
Vol 31 (4) ◽  
pp. 701-712 ◽  
Author(s):  
W.T.F.H. VAN STRIEN- VAN LIEMPT ◽  
J.J.M. VAN ALPHEN
Keyword(s):  
Drosophila Species ◽  
Host Discrimination ◽  
Leptopilina Heterotoma ◽  
Larval Parasitoids ◽  
Asobara Tabida

Olfactory Microhabitat Selection in Leptopilina Heterotoma (Thomson) (Hym.: Eucoilidae), a Parasitoid of Drosophilidae

1984 ◽  
Vol 35 (3) ◽  
pp. 497-504 ◽  
Author(s):  
Louise E.M. Vet ◽  
Karin Van Opzeeland
Keyword(s):  
Foraging Efficiency ◽  
Microhabitat Selection ◽  
Behavioural Flexibility ◽  
Ecological Significance ◽  
Parasitoid Species ◽  
Temporal Separation ◽  
Leptopilina Heterotoma ◽  
Asobara Tabida ◽  
Drosophila Larvae ◽  
Larval Conditioning

Leptopilina heterotoma (Thomson) and Asobara tabida (Nees), solitary endoparasitoids of frugivorous Drosophila larvae, are assumed to be competitors. Olfactometer experiments showed, however, that the species differ in their preference for microhabitat odours. Whereas A. tabida prefers a fresh fermenting sugar/yeast medium, L. heterotoma prefers this medium in a later stage of decay. These results are confirmed by field observations. This temporal separation between the species, which is not complete because some multiparasitism does occur, may be one of the factors to their coexistence. Odour preference in L. heterotoma is not modified by larval conditioning, but conditioning of the adults significantly influenced their odour response. The ecological significance of such learning is discussed. It is argued that even though such behavioural flexibility may enhance foraging efficiency when resources are unpredictable, it may also influence the amount of competition between the two parasitoid species.

Temperature and parasitism by Asobara tabida (Hymenoptera: Braconidae) influence larval pupation behaviour in two Drosophila species

2011 ◽  
Vol 98 (8) ◽  
pp. 705-709 ◽  
Author(s):  
Céline Josso ◽  
Joffrey Moiroux ◽  
Philippe Vernon ◽  
Joan van Baaren ◽  
Jacques J. M. van Alphen
Keyword(s):  
Drosophila Species ◽  
Asobara Tabida

Interspecific interactions between twoTuta absoluta(Lepidoptera: Gelechiidae) larval parasitoids with contrasting life histories

2016 ◽  
Vol 107 (1) ◽  
pp. 32-38 ◽  
Author(s):  
V. Savino ◽  
M.G. Luna ◽  
N.G. Salas Gervassio ◽  
C.E. Coviella
Keyword(s):  
Life Histories ◽  
Interspecific Interactions ◽  
Fixed Time ◽  
Minor Effect ◽  
Host Feeding ◽  
Host Discrimination ◽  
Larval Parasitoids ◽  
Important Pest ◽  
Searching Ability ◽  
A Minor

AbstractInterspecific interactions between two larval parasitoids ofTuta absoluta(Meyrick) with partially overlapping host niches were studied: the idiobiont ectoparasitoidDineulophus phthorimaeaeDe Santis, and the koinobiont endoparasitoidPseudapanteles dignus(Muesebeck).T. absolutais an important pest of tomato crops worldwide, and its management could be improved by understanding the competitive interactions and potential coexistence between these two parasitoids. Firstly, a 15-min fixed time laboratory test evaluated the host-searching ability of adultD. phthorimaeaeandP. dignuswasps onT. absolutalarvae. Secondly,D. phthorimaeaehost discrimination against endoparasitized and non-endoparasitized hosts byP. dignus, at different adult female ages, was experimentally examined.D. phthorimaeaewasps spent significantly more time in general searching in the presence of its competitor than in its absence, but, parasitism was only effective byP. dignus. OlderD. phthorimaeaewasps discriminated significantly less than young wasps betweenT. absolutalarvae parasitized and unparasitized byP. dignus, and an interaction took place by non-concurrent host-feeding. Intra-guild predation ofP. dignuslarvae byD. phthorimaeaefemale feeding behaviour might have a minor effect in this system. Results are discussed in the context of literature supporting diverse evidence of coexistence in other parasitoid-host systems, with implications forT. absolutabiological control.

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