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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/44190

Title: 台灣東北沿岸海域維繫鞭毛蟲的宿命─微生物循環圈中碳傳遞的中繼或是終點?
The fate of nanoflagellates in northeast coastal waters of Taiwan – a relay or the end of carbon flux in the microbial loop
Authors: Chang, Wei-Lun
張維倫
Contributors: 國立臺灣海洋大學:海洋環境與生態研究所
Keywords: 色素型微細鞭毛蟲;異營性微細鞭毛蟲;小型浮游植物攝食率
Pigmented nanoflagellates;Heterotrophic nanoflagellates;Microzooplankton grazing
Date: 2016
Issue Date: 2017-11-15T08:45:43Z
Abstract: 在海洋微生物中的微細鞭毛蟲(Nanoflagellates),主要攝食Pico級生物而將能量往上傳遞。微細鞭毛蟲族群可分為色素型(自營性與混營性)及異營性兩類,然而對於微細鞭毛蟲本身成長率與被攝食率之變化並未有完整數據。本研究想藉由培養實驗真正了解微細鞭毛蟲在台灣東北沿岸海域能量傳遞的過程。本實驗於 2014 年9月至2015年8月,每月於海洋大學水生動物實驗中心附近海域採取表層水,帶回實驗室使用分割過濾法(不過濾培養組及過濾10 μm 濾膜的培養組),每次實驗在室外控溫培養箱進行為期2 天的培養,量測微細鞭毛蟲成長率及被攝食速率。由實驗結果可以發現色素型與異營性微細鞭毛蟲族群,其原始成長率變化在0.05 〜 1.21 d-1與0.17 〜 1.13 d-1之間而高值都在夏季。而纖毛蟲之攝食率在2015年6月發現最高可控制異營性微細鞭毛蟲約60%的生產量,在其餘月份攝食壓對微細鞭毛蟲生產的影響皆在0- 40%之間變動。本研究另外可發現在5月至10月期間纖毛蟲族群可測量到對細菌的攝食速率約在0.08 d-1- 0.2 d-1。另外當纖毛蟲對微細鞭毛蟲族群攝食壓越強時,在不過濾原水培養組中的藍綠細菌數量會明顯增加,而呈現瀑布效應(trophic cascade)的攝食情況。綜合本研究所得結果可了解到在本研究貧營養海域微細鞭毛蟲在11月至4月 (< 25℃),其生產量是無法傳遞至纖毛蟲等之上一食物階層。而在5月至10月(> 25℃),其能量傳遞僅佔微細鞭毛蟲20-30%之生產量。
It is clear from many studies that grazing by pigmented and heterotrophic nanoflagellates can control bacterial and Synechococcus spp. biomass by removing a substantial fraction of bacterial and Synechococcus spp. production in the coastal water of northeastern Taiwan. Little is known about the factors controlling variations in nanoflagellate growth and grazing in oceanic environments. In this study, the size-fractionation experiments (unfiltered and 10 μm filtered treatments) were performed to measure nanoflagellate growth rates, microzooplankton grazing and its effects on their role within the microbial food web. In this study, seawater samples to measure short-term (2 days) growth and grazing experiments were collected from surface waters monthly from September 2014 to August 2015. In the present study, we found that there were the clear seasonal variations in gross growth rates of pigmented and heterotrophic nanoflagellate and with the higher values in summer. In these experiments, significant impact of microzooplankton grazing were detected in January and June 2015, accounted for 50% and 60% of pigmented and heterotrophic nanoflagellate production, respectively. Beside this, the grazing dynamics of bacteria on the western coast of the subtropical Pacific were significantly influenced by ciliates between May and October in some experiments. We also found evidence for the effect of trophic cascades was significant at situations which ciliates obviously grazing on nanoflagellates in unfiltered treatments.
URI: http://ethesys.lib.ntou.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=G0010383008.id
http://ntour.ntou.edu.tw:8080/ir/handle/987654321/44190
Appears in Collections:[海洋環境與生態研究所] 博碩士論文

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