碩士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 105 / Global warming has widely caused concern from general public about its impact on fishery resources, among which the hottest two inferences are fish expansion to high latitude and catch potential decrease in tropical areas. However, there is no study that can answer whether the aforementioned two inferences have been presented in the world fishery catch data. In the study, we tried to use the capture fishery data by nations released by Food and Agriculture Organization (FAO) and global sea surface temperature (SST) data to analyze trend and variation between 1994 and 2013. With these, we found the trends of catch, SST of 165 coastal nations and their relations in order to know the clues of the two inferences that might hidden in the world fishery catch data. The major finding are as follow:
1. Although there were no growth in the world total catch, the number of countries with increasing catch trend were 15% more than those with decreasing catch trend. Most of the increasing were located in low latitude areas. Lowing catch potential caused by tropicalization were not shown in the catch data from low latitude countries.
2. Global oceans have universal rising trend of SST. In the near Artic regions the SST rising were particularily high. Northwestern Pacific and Northeastern Atlantic Oceans were the two hotspot regions. However, only the Northeastern Pacific Ocean supported the fish expansion inference where both catch and SST performed agreeable increasing trend statistically.
3. About 2 of the 15 FAO fishing zones and 16% of the 165 coastal countries, the past performance of catch and SST gennerally supported the two inferences, i.e. lowing catch potential in tropical areas and fish expansion in high latitude areas.
Due to the limitation of FAO catch data content, we can only deal with them by coutry or by FAO fishing zones but are unable to conduct latitudinal break-down for the catch from big coutries. Moreover, the catch data submitted by some countires to FAO by the coastal counties may be disagree with their practicle catch. These factors are of course have influence on the result of the study.
| Identifer | oai:union.ndltd.org:TW/105NTOU5451015 |
| Date | January 2017 |
| Creators | Pan, Guang-Jian, 潘廣健 |
| Contributors | Lu, Hsueh-Jung, 呂學榮 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 109 |
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