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KAKEN_22770058seika.pdf
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Title |
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昆虫類のメス交尾器に"隠された"多様性 : 観察技術の確立と応用
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Kana |
コンチュウルイ ノ メス コウビキ ニ "カクサレタ " タヨウセイ : カンサツ ギジュツ ノ カクリツ ト オウヨウ
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Konchurui no mesu kobiki ni "kakusareta" tayosei : kansatsu gijutsu no kakuritsu to oyo
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Cryptic variation in insect female genitalia: establishment and applications of their observational techniques
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上村, 佳孝
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カミムラ, ヨシタカ
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Kamimura, Yoshitaka
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慶應義塾大学・商学部・准教授
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Research team head
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科研費研究者番号 : 50366952
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2014
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科学研究費補助金研究成果報告書
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2013
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昆虫類などの体内受精をおこなう動物では、雄交尾器は一般に高い種間多様性を示す。しかし、より柔軟な構造であることが多い雌交尾器の多様性は過小評価されてきた。本研究では、雌交尾器形態の多様性を効率よく検出する手法を確立し、交尾器進化に果たす雌の役割を検討した。交尾中に瞬間固定された各種昆虫サンプルに対し、様々な手法を試みた結果、ベンジルアルコール・安息香酸ベンジル混合液により外骨格を透明化する手法が優れていた。この手法により、①雌交尾器の膜質部は雄交尾器形態に対応した形態を示すことが多く、②その「噛み合わせ」が、交尾時の創傷などのコストを軽減するのに重要な役割を果たしていることが明らかとなった。
Animal genitalia of internal fertilizers generally show a rapid evolutionary rate compared with other morphological characters. However, compared to interspecific diversities in male genitalia, female genitalia, which usually consist of soft structures without conspicuous landmarks, received less attention because of the difficulty of observation. In this study, efficient methods to detect and describe diversities in female genital traits were explored using in-copula samples of various insect taxa. As the result, a mixture of benzyl alcohol and benzyl benzoate (BABB) has been proven to be highly effective to make insect exoskeleton transparent. The method revealed that female genitalia generally show a sizable structural diversity in their soft parts corresponding to the species-specific male genitalia. Experiments showed that the structural fitting between male and female genitalia reduces mating costs for females such caused by copulatory wounding and other mechanisms.
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研究種目 : 若手研究(B)
研究期間 : 2010~2013
課題番号 : 22770058
研究分野 : 生物学
科研費の分科・細目 : 基礎生物学・形態・構造
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