Eur. J. Entomol. 109 (4): 517-526, 2012 | DOI: 10.14411/eje.2012.065

Abundance and host associations of parasitoids attacking frugivorous drosophilids on Iriomote-jima, a subtropical island of Japan

Biljana NOVKOVIĆ, Ayako OIKAWA, Yusuke MURATA, Hideyuki MITSUI, Masahito T. KIMURA
Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, Hokkaido 060-0810, Japan; e-mail: biljanan@ees.hokudai.ac.jp

To understand the factors governing the diversity, abundance and host associations of parasitoids attacking frugivorous drosophilid flies on Iriomote-jima, a subtropical island of Japan, we monitored parasitism on several occasions over the period 2003-2009. Fifteen drosophilid and 12 parasitoid species were recorded. Three species of Drosophila, D. bipectinata, D. albomicans and D. takahashii, bred abundantly in banana baits, though their abundance varied between years and seasons. Frequent parasitoid species were Asobara japonica, A. pleuralis (Braconidae), Leptopilina ryukyuensis and L. pacifica (Figitidae). L. victoriae was recorded only in December 2003. In addition, host acceptance and host suitability of the four most frequently recorded parasitoid species were studied in the laboratory. Most parasitoid and drosophilid species showed species-specific associations with more than one antagonist species, suggesting that they have been subjected to complex coevolutionary interactions. In addition, host range of most of the parasitoid species included one of the three major Drosophila species, suggesting that the abundance of potential hosts is one of the factors determining the evolution of parasitoid host use.

Keywords: Hymenoptera, Braconidae, Asobara, Figitidae, Leptopilina, Diptera, Drosophilidae, Drosophila, parasitoid, host association, resistance, virulence

Received: December 20, 2011; Accepted: May 29, 2012; Published: October 5, 2012

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