2018-03-012024-05-13https://scholars.lib.ntu.edu.tw/handle/123456789/654494摘要：高屏峽谷因為底流強勁及地質災害頻繁而成為研究擾動對生態影響的自然實驗室。本計畫將利用海研一號1190航次(2018/3/25-4/3)採集生物量及多樣性高的海洋線蟲，探討擾動頻仍的海底峽谷及相對穩定的斜坡之間是否存在生物多樣性及生態系統功能性的關係。線蟲是海洋中數量最多的多細胞生物，其體型小、生長速度快、世代時間短，貢獻絕大多數底棲動物的生產力。此外線蟲的攝食、排泄、在底泥中造成的生物擾動也促進微生物活動，進而影響沉積物中有機物再礦化、溶氧消耗、營養鹽循環及脫氮等作用。因為在底泥環境扮演傳遞能量的重要角色，近年來線蟲多樣性對生態系功能的影響也成為重要的議題。本計畫將驗證高屏峽谷及斜坡由強烈變動至相對穩定的環境下是否能夠驅動線蟲的多樣性變化，以及其多樣性與生態系統功能之間的關係，並透過多空間尺度及線蟲功能群分析，進一步探討線蟲多型性和生態系功能間的機制與過程，並預測喪失海洋線蟲多樣性對生態系功能的影響。此結果預期將對海洋線蟲在台灣離岸環境影響評估的相關應用研究有重要貢獻。<br> Abstract: Due to strong bottom currents driven by internal tides and frequent turbidity currents triggered by storm surges, river flooding, and earthquakes, Gaoping Submarine Canyons (GPSC) is an ideal natural laboratory for studying effect of disturbance. In this study, we will utilize the upcoming R/V OR1 cruise (3/25–4/3/2018) to sample highly abundant and diverse marine nematodes and to assess their biodiversity and ecosystem function (BEF) relationship between the disturbed GPSC and relative benign sloping environment. The activities of nematodes are known to enhance fluxes of oxygen and organic matters and to stimulate microbial decomposition processes. We hypothesize that the strong physical gradient between canyon and slope will drive a wide range of nematode diversity, contributing to the variation of ecosystem function in elemental cycling. Moreover, we will analyze the nematode functional traits and the shape of BEF relationship through a hierarchical sampling design to elucidate the underlying drivers and possible consequence of the loss of biodiversity in the deep-sea. Most importantly, we expect the results of this study will contribute to the applications of marine nematodes on offshore environmental monitoring in Taiwan.高屏峽谷線蟲生物多樣性與生態系統功能性關係深海Biodiversity–Ecosystem Function RelationshipDeep SeaNematodeGaoping Submarine Canyon