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標題: | 高食物品質和低捕食壓力提升浮游動物的營養轉移效率-以北西太平洋邊緣海為例 High food quality and low predation pressure enhance the trophic transfer efficiency of plankton in the marginal seas of northern West Pacific |
作者: | Min-Sian Su 蘇民弦 |
指導教授: | 謝志豪(Chih-hao Hsieh) |
關鍵字: | 營養傳遞效率,能量傳遞效率,人造年級群方法,碳14吸收法,食物品質,營養結構,浮游生物, trophic transfer efficiency,energy transfer,trophic structure,plankton,artificial cohort method,C14 assimilation method, |
出版年 : | 2014 |
學位: | 碩士 |
摘要: | 浮游動物的營養傳遞效率(TTE)的定義為浮游動物和浮游植物之間的生產力的比值,TTE對於海洋生態系統的營養結構有著關鍵性的影響,然而在一個自然的生態系統中,TTE會受到哪種環境因子的調控仍然未被了解,因此本篇研究在2009-2013年東海區域和東沙島附近分別採用人造年級群與碳14吸收法同時測量浮游動物與浮游植物生產力,進而估算TTE。我們的目標為檢驗TTE與環境因子之間的相關性,並探討何者為影響TTE的關鍵性因子。以下是我們欲測試的假說: (1)低的浮游植物碳氮比能夠藉由增加浮游動物的生長率來提高TTE;(2)越高的仔稚魚密度能夠藉由減低浮游動物生物量來降低TTE;(3)越高的溫度能夠藉由大幅增加浮游動物的攝食率來減低TTE;另外我們也額外測試了兩個可能會藉由調控食物品質進而間接影響TTE的潛在因子:(4)越高的營養鹽會提昇浮游植物的品質,進而提昇TTE;(5)但在較低的營養鹽條件下,越高的光強度會刺激浮游植物的固碳作用,使得食物品質下降,進而降低TTE。我們的結果顯示,影響TTE最為關鍵的因子包含了浮游植物碳氮比與仔稚魚密度,根據結果我們可以推論,越高的食物品質與越低的捕食壓力皆能夠提昇在北西太平洋邊緣海區域的TTE。 Trophic transfer efficiency in plankton (TTE) describes the production rate ratio between zooplankton and phytoplankton (TTE=ZP⁄PP, where ZP is zooplankton production rate and PP is phytoplankton production rate). TTE strongly shapes the trophic structure in marine ecosystems. However, it remains unclear what factors affect TTE in natural systems. In this study, we conducted onboard incubation with the artificial cohort method to measure zooplankton production rate (ZP) and the C14 assimilation method to measure phytoplankton production rate (PP) simultaneously. We then estimated in situ TTE = ZP/PP and investigated the factors including seston C:N ratio, fish larvae density, temperature, nutrients, and light affecting the variation of TTE in the marginal seas of northern West Pacific from 2009 to 2013. Specifically, we tested the following hypotheses: (i) Decreasing seston C:N ratio (proxy for food quality) enhances the TTE by stimulating zooplankton growth; (ii) Increasing fish larvae density reduces the TTE because of increasing predation pressure; (iii) Increasing temperature enhances the TTE by stimulating zooplankton feeding activities. Additionally, we tested the factors indirectly affecting the TTE by affecting food nutritional quality. (iv) Increasing nutrients enhance the TTE by decreasing seston C:N ratio; (v) Increasing light intensity lessens the TTE by enhancing seston C:N ratio when nutrients are limited. The results of GLM model including both seston C:N ratio and fish larvae density gave best correlation with the TTE. Our results demonstrated that, the increases in food nutritional quality for zooplankton, together with the decreases in the predation pressure, may enhance the TTE in the marginal seas of northern West Pacific. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/57764 |
全文授權: | 有償授權 |
顯示於系所單位: | 海洋研究所 |
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