請用此 Handle URI 來引用此文件:
http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/6038
標題: | 利用衛星遙測技術研究近40年來棲地破壞對日本鰻資源量的影響 Study of the relationship between Anguilla japonica resource and habitat destruction by satellite remote sensing in the past 40 years |
作者: | Jian-Ze Chen 陳健澤 |
指導教授: | 韓玉山 |
關鍵字: | 棲地破壞,日本鰻,衛星遙測技術,東亞四國,鰻魚資源量, habitat destruction,Japanese eel,satellite remote sensing,East Asia four countries,eel stock size, |
出版年 : | 2013 |
學位: | 碩士 |
摘要: | 日本鰻是日本、韓國、台灣及中國重要養殖魚種,目前養殖業者的鰻苗完全仰賴漁民在河口捕撈。然而其資源量從1970年代以後急遽下降;且近年來因各國都市及工業不斷擴張,而使鰻魚的自然棲地受到嚴重的破壞。本研究擬探討從1970至2010年代,東亞四國日本鰻棲地改變的情形,與鰻魚長期資源量相互比較,觀察是否有所關聯性。
本研究實驗方法使用衛星遙測技術,將其應用在土地覆蓋之改變(Land Cover Change, LCC).衛星遙測技術是一項分析時間空間改變有效率的工具,它可以大範圍紀錄古今的地理樣貌,以提高效率以及精準度以利實驗分析。而本研究區域是從東亞四國中,各選定四條主要鰻苗捕撈河川,藉由USGS下載各河川衛星照片後,再由Arc GIS分析其棲地改變之情形。結果顯示,日本在1970至2010年代當中,河川天然棲地長度減少21%,天然面積減少27%,棲地品質指數(habitat quality index, HQI) 減少6%;韓國,天然棲地長度減少46%,天然面積減少57%,HQI減少29%;台灣,天然棲地長度減少22%,天然面積減少53%,HQI減少50%;中國,天然棲地長度減少76%,天然面積減少81%, HQI減少25%。在鰻苗長期資源量方面,日本官方平均年產量在1970年代為80.6噸,1990年代為35.9噸,而近5年來為6.6噸,資源量在1970年代至現今減少92%;而根據福隆當地漁民資料,1984~1995年間,年平均總產量334096隻,而2007~2013年間,年平均總產量14190隻,資源量從1970年代至今減少達96%。 結論而言,東亞地區在1970到2010年代,天然棲地總長度減少47%,天然棲地總面積減少81%,HQI減少25%。與鰻苗資源量官方統計減少92%及福隆當地漁民統計減少96%相互比較,鰻苗資源量應受到棲地破壞而減少。 The Japanese eel is an important aquaculture species in Japan, Korea, Taiwan and China. At present the only source of glass eels needed by fish farmers comes solely from the catches made by fishermen at river mouths. However eel stocks have been in rapid decline since the 1970s. Furthermore with urbanization and constant expansion of industrialization in various countries, the natural habitat of eels have been severely damaged. The aim of this study is to discuss the relationship between habitat changes in the four East Asian countries and the long-term eel stock size from the 1970s to the early 2010s. The method of this study is using satellite remote sensing on land cover change (LCC). Satellite remote sensing is an efficient tool for analyzing temporal and spatial changes as it could record geographical features on a large geographical scales over times to enhance efficiency and accuracy to facilitate data analysis. Present study focus on four major eel-catching rivers in each of the four East Asian countries. Then satellite images of those rivers were downloaded from the USGS website and fed to ArcGIS to analyze the condition of habitat change in each of them. The result of this study shows that in the period of 1970s~2010s in Japan, the length of natural habitats in the rivers decreased by 21%, loss of natural areas is 27%, and the habitat quality index, (HQI) decreased by 6%. In Korea, the length of natural habitats in the rivers decreased by 46%, the loss of natural areas is 57%, and the HQI decreased by 29%. In Taiwan, the length of natural habitats in the rivers decreased by 22%, the loss of natural areas is 53%, and the HQI decreased by 50%. In China, the length of natural habitats in the rivers decreased by 76%, the loss of natural areas is 81%, and the HQI decreased by 25%. In terms of long-term glass eel stock sizes, Japanese official data shows 80.6 tons of annual production in the 1970s, 35.9 tons in the 1990s and in the recent 5 years it is 6.6 tons. The eel stock size decreases by 92% from the 1970s to the present day. According to local fisherman in Fulung, eel stock data in the period of 1984~1995, the mean annual catch of glass eels is 334096, however, in the period of 2007~2013, the total number of glass eels is 14190 on average per year and the stock size decreases by 96% from the 1970s to the present day. In summary, in East Asia from the 1970s to the 2010s, the total length of natural habitats decreased by 47%, the loss of total natural habitats is 81%, and the HQI decreased by 25%. Compared with the official eel stock decrease of 92% in Japan, and local fisherman data of a decrease of 96% in Fulung, this shows eel stock size decline should be related to habitat loss. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/6038 |
全文授權: | 同意授權(全球公開) |
顯示於系所單位: | 漁業科學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
---|---|---|---|
ntu-102-1.pdf | 8.79 MB | Adobe PDF | 檢視/開啟 |
系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。