- 學位論文
不同粒徑浮游生物體內微量元素的濃度變化
Trace element concentrations in size-fractionated marine planktons
摘要
本研究地點位於東海南部湧昇流區、近龜山島區及西菲律賓海。利用超純淨採樣技術，採集浮游生物並區分為不同尺寸大小與基本組成種類（0.4-10 μm、10-63 μm、63-153 μm、>153 μm 363~500 μm、500~1000 μm、1000~2000 μm、2000 μm~2 cm、2~4 cm、>4 cm）並測量浮游生物樣本中C、N、S、P、Fe、Zn、Cu、Ni以及Cd 含量。綜合實驗結果，浮游動物之基礎建構元素C、N、S與P重量百分比穩定。浮游動物種間之微量元素濃度變化以及各元素含量莫爾比大不相同，同種但不同尺寸下的浮游動物之微量元素組成比例亦不同。橈足類哲水蚤目與劍水蚤目之食性與生理差異並不會造成微量元素含量有顯著差異。介形亞綱則會因攝食策略、代謝速率等生理差異而使微量元素較易累積至體內。真蝦總目則主要受到體型變化、代謝需求影響體內元素含量。 總言之，浮游生物所含微量元素受控於體型、食性、生理反應等因子，更進一步詳細探討才能剖析浮游生物對於微量元素於海洋生地化循環的重要性。
並列摘要
In this study, size fractionated planktons (i.e., 0.4-10μm, 10-63μm, 63-153μm, >153μm, 363-500μm, 500-1000μm, 1000-2000μm, 2000-2cm, 2-4cm, >4cm) were collected at three oceanic environments, locations at a up-welling region and a volcanic activity region of Southern East China Sea, and oligotrophic Western Philippine Sea by ultraclean techniques. Samples were further analyzed for their elemental (C, N, S and P) and trace metal (Fe, Zn, Cu, Ni and Cd) content. The results revealed that the composition of structural elements (C, N, S and P) remain almost at constant proportions, but trace elements (Fe, Zn, Cu, Ni and Cd) are significantly different at various body sizes and species. It was also found that physiological difference between Calanoida and Cyclopoida had no effect on their trace metal content (except Cu), but higher content was discovered in Ostracoda, mainly due to its feeding strategy and metabolism rate. In addition, trace metal concentration in Eucarida show dramatic changes with increasing body size, mainly due to the effect of growth dilution and metabolism requirement. It appeared that trace elements in zooplankton are mainly controlled by physiological characteristics, less affected by environmental conditions.