Otolith Ecogeochemistry Researches: Applications of Isotopic Composition Analytical Techniques on Fish Ecological Studies

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Project title

Code/計畫編號

NSC99-2621-B019-005-MY3

Translated Name/計畫中文名

耳石生態地化研究:同位素分析技術在魚類生態研究之應用

Project Coordinator/計畫主持人

Chia-Hui Wang

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

游鎮烽

Department/Unit

Department of Environmental Biology and Fisheries Science

Website

https://www.grb.gov.tw/search/planDetail?id=2211206

Year

2011

Start date/計畫起

01-08-2011

Expected Completion/計畫迄

01-07-2012

Bugetid/研究經費

1000千元

ResearchField/研究領域

海洋科學
自然生態保育

"硬骨魚類的耳石是控制魚體平衡的一霰石結晶，主要由碳酸鈣組成，另包含有小部份的有機物質以及其他微量元素。耳石在魚類生物出生時就已經產生，會隨這生物體成長而持續成長，不會再被生物體所吸收。它具有週期性沉積的日(年)輪構造，輪寬可以用來回推其成長率，而其微量元素組成會受到所生活水團化學特徵的影響，也常被用來追溯魚體過去的洄游環境歷程。本研究將建立高精密度魚類耳石同位素分析的技術，將以往僅分析元素濃度的解析力，提昇到可以更精密解析魚類微棲地移動、生理改變及回溯攝食歷程。本計劃結合了地球化學以及魚類生態的跨領域知識，分年度探討適用於魚類的鹽度及微棲地洄游歷程、代謝及食性以及環境污染等三個大類的魚類生物及生態學問題之最適當的示蹤劑，分析包括氧、鍶、硫、碳、氮、鉛及硼等同位素，並應用在解決台灣附近海域之烏魚族群問題，判別洄游群之不同產卵場個體，區分本地群之不同微棲地移動情形，並希望在耳石上找出能反應污染歷程之示蹤劑。" "Teleost otoliths are the balance and hearing organ of the fishes, and are composed mainly with calcium carbonate. Small portion of protein and trace elements will also be incorporated in otoliths. Otoliths were formed since the fish was born and continuously growth. Once the calcium carbonate deposited, it will not be reabsorbed by the fish. Otolith contains daily/annual increments and the width of the increments could be used to back-calculated its growth rate. Chemical composition of otolith was influenced by water chemistry that the fish were experienced. Therefore, by analyzing its trace element and isotopes composition, the past migratory environmental history were able to be investigated. Present study aims to further establish high precision analytical techniques of otolith isotopes. The analytical resolutions will increase from past research focusing on trace elemental concentrations, to be able to precisely analyze isotopes as tracers for investigating fish micro-habitat movements, physiological change and dietary history. The project combine knowledge of geochemistry and fish ecology, and aim to explore more advanced tracers for fish salinity gradient and microhabitat movements; metabolism and dietary shift; and pollution indicators in each year. High precision isotope analytical techniques, including oxygen, strontium, sulfur, carbon, nitrogen, lead and boron isotopes, will be established. Population complexity of mullet around Taiwan will be solved by applying those techniques. Migrants that spawned from different spawning grounds will be separated and residents inhabitated in different type of aquatic system will be discriminated. Pollution sources and ocean acidification history will also be examined."

Keyword(s)

烏魚
耳石元素組成
洄游環境史
雷射耦合電漿質譜儀
Mugil cephalus
otolith elemental composition
migratory environmental history
LA-ICP-MS

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Otolith Ecogeochemistry Researches: Applications of Isotopic Composition Analytical Techniques on Fish Ecological Studies

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