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|Title: ||Long-term change in fish community structure revealed by landing data of coastal fisheries in Taiwan waters|
|Authors: ||Hsueh-Jung LU;Jia-Sin HER;Chiu-Hsia CHENG|
|Issue Date: ||2017-01-16T06:07:20Z
|Publisher: ||The 6 th International Symposium on Digital Earth|
|Abstract: ||Abstract:Like other marine ecosystem in the world, the fish community in the coastal waters of Taiwan have been under pressures from human’s fishing activities for several decades and global climatic change is likely an additional impact factor on them in recent years. In order to understand the possible impact that climate change has on the coastal fishery environment, we integrated landing database (1963~2005) and sea surface temperature data of the coastal waters. We calculate Mean Trophic Level (MTL), Fishing-in-Balance (FIB), and Seasonal Index (SI) that showing long-term structural change of fish community in the coastal waters of Taiwan. The trends of MTL and FIB values indicated that the resource utilization of Taiwan coastal fishery were unbalanced. The large fishes at high trophic level decreased gradually, but small pelagic fishes increased at the same time. The average MTL decreasing rate was higher than world’s average speed in continental shelves. The variation of catch for species with single peak suggested that peak-in-spring and peak-in-summer species gradually predominated over peak-in-winter species year after year. In addition to the catch pressure, the climate changes may result in the catch variation of small pelagic fishes. As the inter-annual fluctuations of small pelagic fishes were much higher than others, the structure of food pyramid for the coastal fisheries were weaken even more, which need to pay more attention on. This study also analyzed the relationship between marine capture industry and variations of sea surface temperature. The continued increasing surface sea temperature (SST) caused high catch of some specific and seasonal fish species, and accelerated the change of ecological structures.|
|Appears in Collections:||[環境生物與漁業科學學系] 演講及研討會|
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