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研究生:胡心怡
研究生(外文):Hu Shi I
論文名稱:利用食底泥動物之攝食率及生長率來評估沈積物中有機養分的供應量
指導教授:程一駿程一駿引用關係
學位類別:碩士
校院名稱:國立海洋大學
系所名稱:海洋生物研究所
學門:自然科學學門
學類:海洋科學學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:72
中文關鍵詞:食底泥動物小頭蟲生長率攝食率
外文關鍵詞:Capitella sp.Ideposit feedergrowth ratefeeding rate
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對食底泥動物而言,食物為其生存的限制因子,因此沉積物中有機養分的供應量,與動物的生長、存活與發育間有著密切的關係。本研究之目的是利用食底泥動物(Capitella sp. I)的攝食率及生長率,作為沈積物中有機養分的指標,並配合沉積物中的化學成分與其它的環境因子之分析,來瞭解不同的沉積環境對食底泥動物之養分供應量的多寡。
首先求出Capitella sp. I生長最佳的天數及平均攝食率,再調製不同有機養分之沉積物,作出沉積物中之有機養分與Capitella sp. I的生長及攝食率間之標準關係式,最後再採集野外不同來源及不同有機含量之溼地沉積物來作食性實驗及化學分析,並將這些結果與標準關係式作一對照,以確定台灣溼地沉積物之有機養分的含量。
由所製作之生長率的標準關係式之結果可看出,Capitella sp. I之生長率在TON (Total Organic Nitrogen)濃度介於0~2.8 mg N.g sediment-1,TOC (Total Organic Carbon)濃度介於0~22.4 mg C.g sediment-1及EHAA(Enzyme Hydrolyzable Amino Acid)濃度介於0 ~4.48 mg EHAA.g sediment-1之間會隨著濃度的上升而增高,然而當有機養分之濃度超過某一臨界值之後,生長率則會下降。而由攝食率之標準關係式則可看出,Capitella sp. I的攝食率在TON濃度介於0~2 mg N.g sediment-1,TOC濃度介於0~14.1 mg C.g sediment-1及EHAA濃度介於0~3.2 mg EHAA.g sediment-1之間時,會隨著養分的濃度上升而增加,在超過這些濃度後,攝食率則會下降。接下來以標準關係式的生長率是否落於野外沈積物生長率迴歸線之99﹪信賴區間,和判定此兩組數據的平行關係,以及求取野外沉積物之平均生長率到標準迴歸線的垂直距離,進一步比較標準關係式與餵食Capitella sp.I野外沈積物所得的生長及攝食率,來討論在沈積物中何種形式之有機含量與動物的生長及攝食率間有最直接的關係,最後判定出EHAA之標準關係式最能表示出Capitella sp.I攝取野外沈積物的生長及攝食狀況。所以我們認為本研究所得之標準關係式是合理且能應用於評估食底泥動物在野外環境的實際生長及攝食狀況。
因此,我們能利用Capitella sp.I在沈積物中之生長特性及攝食行為,做為一種環境監測的生物評估法(bioassay),來評估自然沈積物中有機養分含量的多寡,並配合沈積物之化學成分分析以及其它相關環境因子的檢測,來瞭解台灣河口地區之沈積物中的有機養分供應情形,及受到污染的程度。
Food is a limiting factor for deposit feeders. Thus, the availability of sediment nutrients has a close relationship with the growth, survive and development of the animal. The purpose of this study is to use the ingestion and growth rates of Capitella sp. I as the indicators to assess the sediment nutrients. Then, we can combine these results with the analysis of chemical and environment factors to understand the bioavailability of the sedimentary nutrients.
In the preliminary study, the optimal growth period and average ingestion rate of Capitella sp. I were obtained from the laboratory. Then, the standard curves of the growth and ingestion rates in response to different nutrients by Capitella sp. I were made. Finally, the sediments collected from different coastal wetlands in western Taiwan were used for the feeding experiments and chemical analyses. A comparison between the field and laboratory experiments was made to assess the sediment nutrients of the wetlands in Taiwan
In the growth rate standard curve, Capitella sp.I increased its growth rate with organic matter concentration between TON 0~2.8 mg N.g sediment-1, TOC of 0~22.4 mg C.g sediment-1 and EHAA of 0~4.48 mg EHAA.g sediment-1 . After the nutrients concentrations exceed these values, the growth rate decreased. In the ingestion rate standard curve, Capitella sp.I increased its ingestion rate with the organic matter concentration between TON of 0~2 mg N.g sediment-1, TOC of 0~14.1 mg C.g sediment-1 and EHAA of 0~3.2 mg EHAA.g sediment-1. After the nutrients concentrations exceed these values, the ingestion rate also decreased. To determine which nutrent parameter is the most appropriate representive for the field study, the first step is to decide whether the growth rate obtained from the laboratory fell within 99% confidence limit of growth rate curve obtained from the field data and whether these two data sets are parallel. Then, to determine which parameter had the shortest perpendicular distance between the field and laboratory curves. The same technique was also use to determine which nutrient parameter is most suitable to determine the ingestion rate in the field. Both results showed that EHAA is the most appropriate parameter that can represents the growth and feeding condition of Capitella sp.I in the field.
This study proved tentatively that, the growth characters and feeding behavior of Capitella sp.I can be use as the bioassay method to estimate sediment nutrient. The combination of these bioassay results and the relevant chemical and environmental factors, allows us to determine the nutrient bioavailable and pollution conditions in the estuaries of Taiwan.
第一章 前言………………………………………………….1
沈積物中之有機養分……………………..……………..1
食底泥動物的食性選擇行為……………………………3
沈積物之養分含量對食底泥動物攝食行為的影響…....4
沈積物之養分含量對食底泥動物生長的影響…………6
以生物測定法來評估沈積物中有機養分之供應量……7
生物測定法與化學測定法之間的關係…………………8
研究目的…………………………………………………9
第二章 材料與方法…………………...……………………10
實驗設計………………………………………..………10
實驗動物Capitella sp. I之生活史的介紹………….….10
選用Capitella sp. I做為實驗動物之原因....…………..11
實驗動物Capitella sp.I的飼養………………………..12
食性行為實驗……………………….………………….12
底泥營養價值的分析……………….………………….19
統計分析…………………………….………………….22
第三章 結果………………………………...………………23
3.1 標準關係式………………………………………...23
3.2 野外採集之沈積物………………………………...24
第四章 討論………………………………………………...28
4.1 標準關係式之製作…………………...……………28
4.2 以標準關係式來反映食底泥動物在野外的實際生長及攝食狀態…………………………….………….34
4.3 能量的攝取對食底泥動物資源分配方式的影響...40
4.4 利用Capitella sp.I做為沈積物有機養分及污染之
指標物種……………………………………..…….41
第五章 結論………………………………………………...43
附表………………………………………………………….45
附圖……………………………………………………….…50
參考文獻……………………………………………….……58
附錄一…………………………………………………….…65
附錄二…………………………………………………….....72
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