博士 / 國立臺灣海洋大學 / 環境生物與漁業科學學系 / 104 / Climate changing has been affecting human’s daily life for a certain period. Present responses to climatic impacts are yet to stop systems from global changing. It is suggested that, with appropriate preventions to climate change in early stage, the degree of climatic variations induced impacts could be relieved. The skipjack tuna stock in the Western and Central Pacific Ocean (WCPO) is a vital economic resources, which is one of main protein sources for human, and also promotes the development of associated industries, as well as plenty employments. Thus, it is significant to mitigate and minimize the impacts of climate change on skipjack. In order to achieve this, it is essential to understand how climate change affects the resources. Previous studies have revealed profound impacts of extreme events on the functioning and primary productivity of marine ecosystems in the WCPO. This study aimed to investigate the relationships among various factors, including the abundance of skipjack tuna, primary productivity, different types of El Niño events and habitat suitability. Fisheries and environmental data of certain period and Representative concentration pathways emission scenario database were adopted to assess the catch potential of skipjack in the WCPO. Key findings from the study are the following:
1. In the important stage of life history, the changes of primary productivity will affect skipjack stock and causing time delay relationships between stock recruitment and primary productivity.
2. In terms of the consequences of different types of El Niño events, Central-Pacific El Niño events can play a more influential role than do Eastern-Pacific El Niño events, and relatively higher vulnerability values were found to be associated with the simultaneous occurrence of the two types of El Niño.
3. Form lowest to highest greenhouse gas emission scenario, there could be a stable to relatively a small increase in the catch potential in WCPO. However, the annual oscillations of catch potential would be observed as more intense attributing to global warming.
4. In a moderate global warming scenario, with the intensified El Niño events, the vulnerability of the skipjack resources will increase, and the catch potential will decrease.
5. Positive correlation between catch potential and primary productivity varied in space; therefore, the primary productivity may be insufficient to meet the transfer of catch potential in the future.
It is advised that the impacts of global climate variations, particularly El Niño events, on skipjack tuna should be continuously taken into consideration in the fisheries management to ensure the sustainable exploitation of skipjack resources in the WPCO.
| Identifer | oai:union.ndltd.org:TW/104NTOU5451014 |
| Date | January 2016 |
| Creators | Yen, Kuo-Wei, 嚴國維 |
| 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 | 71 |
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