Assessment of aphid colonies by hoverflies. II pea aphids and 3 syrphid species;Betasyrphus serarius (Wiedemann),Metasyrphus frequens Matsumura andSyrphus vitripennis (Meigen) (Diptera: Syrphidae) |
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Authors: | Eiko Kan |
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Institution: | (1) Department of Zoology, Kyoto University, 606 Sakyo, Kyoto, Japan |
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Abstract: | In the aphidophagous syrphid species,Betasyrphus serarius (Wiedemann),Metasyrphus frequens Matsumura andSyrphus vitripennis (Meigen), females in search of oviposition sites assess the qualitative and quantitative value of pea aphid colonies for
securing the successful development of their offspring. They select, as their oviposition sites, young and “promising” aphid
colonies consisting of nymphs and/or adult aphids including few winged adults. They neglect large, older colonies of 4th-instar
nymphs and/or winged adult aphids. The 3 syrphid species adopt “buy-futures” ovipositional tactic as doesEpisyrphus balteatus (de Geer), although some tinge of “spot-transaction” is noticed inM. frequens andS. vitripennis. |
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