2018-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/701928摘要：砷在海洋中的變化，分佈，物種形態和生物轉化作用是過去十幾年的海洋生物地球化學研究焦點。雖然我們已知無機砷在海水中占主導地位，但它的生物累積性與生物轉化作用仍然是亟待釐清的問題。浮游植物被認為是高階生物的主要食物來源，在海洋環境中與細菌同時扮演溶解砷的生物轉化和分佈作用。但是部分固氮細菌居然也會對砷產生吸收與轉化反應。迄今，雖然有關砷的生物反應，結構形成和食階轉移的研究已經在海洋研究中逐漸受到重視，但對固氮微生物系統和相關膠體領域的研究卻付之闕如，對這些反應過程知之甚微。這些都是海洋食物鏈中有關砷的未解的重要問題。本研究將探討海洋食物鏈中砷的生物累積，生物轉化和食階轉移，本年度特別著重於高分子有機及無機砷物種與浮游植物與固氮藻類。<br> Abstract: The occurrence, distribution, speciation, and biotransformation of arsenic in the ocean have been a focal point during last couple of decades. Inorganic arsenics (arsenite and arsenate) dominates in marine waters, it’s bioaccumulation and biotransformation by aquatic organisms is of main concerns. Phytoplankton is considered as a major food source for the organisms of higher trophic levels, and it plays important role in biotransformation and distribution of dissolved arsenic species in the marine environment. Also, assimilation of arsenic by phytoplankton and bacteria, and trophic transfer of arsenic in marine food chains have been important concerns due to health effects on dietary intake. Which have received major attention in marine researches, however, very little is known about these processes in microbial loop and related colloidal domain. This research will focus on the bioaccumulation, biotransformation, and trophic transfer of arsenic in marine food chain,special emphasis on the high molecular weight fraction.砷物種生物累積生物轉化浮游植物固氮藻類食階轉移ArsenicSpeciationBioaccumulationBiotransformationPhytoplanktonZooplanktonFood chain