日本生態学会大会講演要旨集
第51回日本生態学会大会 釧路大会
セッションID: O1-W07
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サトイモ科植物とタロイモショウジョウバエにおける送粉共生系の進化
*竹中 宏平戸田 正憲
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会議録・要旨集 フリー

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Many species of Colocasiomyia (Diptera, Drosophilidae) depend exclusively on flowers of Araceae species for mating, oviposition and larval development. These flies play an indispensable role in pollination of their host plants. This resembles fig and fig wasp system in having features of both plant-herbivore and plant-pollinator relationships. Characteristic of this pollination mutualism is that fly larvae do not eat the seeds. Furthermore, plant-insect relationships range widely, from obligate mutualism to broad generalism. However, there is some correspondence in host selection between Araceae tribes and Colocasiomyia species-group. Another feature of this pollination mutualism is ‘synhospitalism’, in which two Colocasiomyia species coexist in a single host inflorescence. Usually, one fly species in a synhospitalic pairs uses mainly the upper (male) part of the inflorescence and the other species the lower (female) part. A phylogenetic tree of the flies suggests two possible pathways for the coevolution of this synhospitalism. We review this pollination mutualism and present new findings from Borneo.

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