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| 疣荔枝螺(Thais clavigera)性畸变现象的解剖学和组织学研究 |
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于秀娟1,2, 黄长江1,2, 朱四喜1,2, 沈金辉3, 董巧香4
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1.汕头大学水生生物技术与环境资源保护研究所;2.暨南大学水生生物研究所;3.汕头市中心医院病理科;4.Aquaculture Research Station,Louisiana Agricultural Experiment Station,Louisiana State University Agriculture Center
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| 摘要: |
| 以解剖学和组织学的方法研究了有机锡污染生物指示种—— 疣荔枝螺的正常雄、雌和性畸变个体的生殖系统。结果表明，性畸变个体除具有正常的雌性器官外，还有输精管或阴茎。当性畸变程度严重时，性畸变不育个体的卵囊腺组织出现破损，并具有不规则块状的不育卵囊和未排出的正常卵囊。虽然性畸变个体的雄性器官具有表现出雄性功能的潜能，但由于缺少精巢或完整的前列腺，不可能发展成为具有雄性功能的个体，这与性逆转有着本质上的区别。有机锡污染引起的性畸变已对疣荔枝螺种群生存构成了潜在的威胁，深化此类负面生态效应的研究是人类面临的重要课题。 |
| 关键词: 疣荔枝螺，性畸变，解剖学，组织学，有机锡 |
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| 基金项目:国家自然科学基金项目，40176029号；广东省重大科技兴海项目，A200005F02号；广东省自然科学基金项目，000792号 |
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| ANATOMICAL AND HISTOLOGlCAL STUDIES ON IMPOSEX OF THAIS CLAVIGERA |
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YU Xiu-Juan1,2, HUANG Chang-Jiang1,2, ZHU Si-Xi1,2, SHEN Jin-Hui3, DONG Qiao-Xiang4
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1.Institute of Aquatic Technology and Environmental Resources Protection, Shantou University;2.Institute of Hydrobiology, Jinan University;3.Department of Pathology, Shantou Central Hospital;4.Aquaculture Research Station,Louisiana Agricultural Experiment Station,Louisiana State University Agriculture Center
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| Abstract: |
| During July 2002 and March 2003，50 normal males，80 normal females and 100 imposexed females of Thais clavigera collected from coastal harbors in Guangdong Province of China，were used for anatomical and histological structure analysis．Results showed that the male genital system mainly comprised the testis，prostate gland，vas deferens and penis．The normal female genital system mainly comprised ovary，oviduct，albumen gland，ingestion gland，capsule gland and Vaginal opening．The imposexed females exhibited a penis and/or vas deferens in addition to the normal female genital organs mentioned above．Capsule glands of females with severe imposex were damaged and contained irregular lumps of aborted egg capsules and normal unreleased egg capsules．Regardless of their imposex severity，however，the ovary，albumen gland and ingestion gland did not show any difference from those of normal females．The comparison of the male sex organs of imposex females with that of normal males showed similarities in morphology，origin and histological structure．In Fare cases，the origin of vas deferens of imposex females was different from that of the normal males．However，the imposexed females lacked testis and a fully developed prostate gland，which prevented the possession of a full male genital system．In addition，penises without ducts was observed in females at lower developmental stages of imposex．The imposexed female may have the potential to perform the function of male sex organs，but could not act as a functional male．This is the distinctive difference between imposex and sexual reversal．The formation of male sex organs on imposexed females also inhibit their female sex organs to function properly．Therefore，imposex induced by TBT results in population decline of T.clavigera by disrupting the female reproductive mechanism．Imposex in gastropods，used as the biological monitor．will offer a promising approach in assessing the effects of endocrine disruptors such as TBT，TPT on marine organisms．In order to protect marine biological reSOUDt2es and human health，the estrogenic effects and androgenic effects need further research． |
| Key words: Thais clavigera,Imposex,Anatomy,Histology,Organotin |