Tephritid flies (Diptera) and forest vegetation of Shikoku, Japan

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  • SUEYOSHI Masahiro
    Forest Zoology Group, Kyusyu Research Center, Forestry and Forest Products Research Institute

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  • 四国のミバエ科(双翅目)昆虫相と森林植生
  • シコク ノ ミバエカ(ソウシモク)コンチュウソウ ト シンリンショクセイ

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Abstract

Shikoku, the smallest main island of Japan, has a broad range of natural vegetations from hill forest to subalpine forest. It retains natural forests in small and scattered patches and most of natural vegetations have been replaced with plantations or orchards of economically important trees and agricultural fields. I review here geographic distribution of phytophagous flies, Tephritidae (Diptera), in Shikoku and discuss how vegetational differences in Shikoku affect tephritid species assemblages. Seventy-nine species, of which 11 are new to Shikoku, are recorded, based on published data and examination of supplementary specimens. They are estimated to represent more than 90% of the tephritid fauna in Shikoku. Tephritid flies are distributed over a broad range of natural and secondary vegetations. The results of the Non-metrical Multidimentional Scaling, using the presence-absence data of tephritid species from 48 collection localities, indicate that tephritid assemblages are affected by differences in natural, primary vegetations rather than by those in secondary, modified vegetations. Alsangelisca takeuchii (Ito), Calosphenisca aliquantula (Ito) and Campiglossa jugosa (Ito) have been found only in the montane and subalpine natural forests of Mts. Ishiduchi and Takashiro, as the southernmost, isolated populations in their distribution ranges. Conserving natural forests of these areas is recommended for maintaining the species diversity of tephritid flies in Shikoku.

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