2007-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/710983摘要：了解人為擾動與氣候變遷之交互作用對於海洋生態系的影響，是建立良善的經營管理策略以致於能永續利用海洋資源重要的一環。以東海生態系統為例，我的研究目標是建立一個高效率自動化系統來監測海洋生態系統的變動，例如三峽大壩之建立或沙塵暴對東海生態系食階動態的影響。這個系統以浮游動物為對象，因為浮游動物是聯繫初級生產者與魚類間重要的一環，而且浮游動物群聚組成對於環境變動相當敏感，有利於建立生態性指標。 本計畫將引進浮游動物掃瞄器（ZooScan）作為快速地取得浮游動物影像之工具，並建立自動化的影像分析系統，達到獲取粗略的浮游動物組成以及詳細的生物個體大小分布之資料，系統的最佳化則擬同時以傳統顯微鏡人工鑑種的方式反覆測試進行。最終利用所建立之自動化系統，分析總計畫規劃航次中取得之現場樣本，建立東海現場之浮游動物種類及生物個體大小分布之資料，這些資料是為本計畫研究環境變動對於海洋生態系之影響以及發展解析個體大小分布之生態理論(size-based theory)，以及生態性指標建立之依據。 我將於東海採集浮游動物，並建立自動化系統以及浮游動物影像資料庫。所獲得之資料，將與其他子計畫之成果做比對與綜合分析，浮游動物種類與個體大小組成資訊，將可用於生地化耦合數值模式的發展。 <br> Abstract: Understanding synergistic effects of human disturbance and climate change on marine ecosystems is essential to develop management strategies for sustainable use and conservation of ecosystems. Using the East China Sea (ECS) ecosystem as a case study, we aim to develop an effective and efficient automatic monitoring system to investigate the dynamics of the coastal ocean ecosystem. We select ECS because this ecosystem has been strongly affected by both anthropogenic (construction of Three-Gorge Dam) and climatic effects (variations of the monsoon system and episodic dust storms effects driven by global climate change). More importantly, management of fisheries resources around Taiwan requires understanding of the ECS ecosystem, because many commercial migratory fish species (e.g. anchovy and mullet) move between ECS and the Taiwan coast. We propose to study zooplankton communities because zooplankton play an important role as an trophic linkage between primary producers and fishes. Two aspects of zooplankton will be investigated: taxonomic composition and size distribution. Taxonomic composition is a well-known indicator commonly used for investigating ocean ecosystem state, e.g. changes in temperature, circulation, pollution, or trophic status. In addition to the traditional study of taxonomic composition, we propose to investigate the size distribution of zooplankton (size spectrum). Size spectrum of a community can be investigated by plotting size octave V.S. frequency(size) in the log space. The slope of the size spectrum reveals the energy transfer efficiency of the community, with a smaller slope indicating higher efficiency while a greater slope indicating lower efficiency. We expect to see the slope of the size spectrum shifts from a low to high value owing to the damming effects, as nutrients from Yangtze River to the ECS were blocked by the Three-Gorge Dam. An automatic monitoring system based on ZooScan will be implemented to gain zooplankton size and taxonomic data. ZooScan is a high-resolution scanner that can capture images of zooplankton and carry out image analysis. Ecological meaningful composition data will be obtained with high efficiency, albeit with limitation in taxonomic resolution. We will select representative samples to identify species under microscope and investigate the limitation of our system. Through the processes, we will construct a water-mass specific image database of zooplankton, which will be made available for other researchers. Another readily available data from ZooScan is the size spectrum. These size data can be obtained with high accuracy and efficiency. Eventually, size components and taxonomic information can be incorporated into physical-biological coupled ecosystem models. In addition,浮游動物生物個體大小分布種類組成浮游動物掃瞄器影像資料庫海洋生態系統ZooplanktonSize spectrumTaxonomic compositionZooScanImage databaseOcean ecosystem state