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Sustainability 2016, 8(3), 273; doi:10.3390/su8030273

Changes in Patterns of Seasonality Shown by Migratory Fish under Global Warming: Evidence from Catch Data of Taiwan’s Coastal Fisheries

1
Department of Environmental Biology and Fisheries Science, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 20224, Taiwan
2
Department of Global Agricultural Sciences, Tokyo University, 7-3-1 Yayoi, Bunkyo, Tokyo 113-8657, Japan
3
Center of Excellence for the Oceans, National Taiwan Ocean University, 2 Pei-Ning Road, Keelung 20224, Taiwan
4
Coastal and Offshore Resources Research Center, Fisheries Research Institute, Council of Agriculture, No. 6, Yugang N. 3rd Rd., Cianjhen District, Kaohsiung 80672, Taiwan
5
Marine Fisheries Division, Fisheries Research Institute, Council of Agriculture, No.199, He 1st Rd, Keelung 20246, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Vincenzo Torretta
Received: 7 January 2016 / Revised: 10 March 2016 / Accepted: 10 March 2016 / Published: 16 March 2016
(This article belongs to the Section Sustainable Use of the Environment and Resources)
View Full-Text   |   Download PDF [6463 KB, uploaded 16 March 2016]   |  

Abstract

In this study, we analyzed the fish species composition data of coastal capture fisheries in Taiwan between 1963 and 2010. The purpose of the analysis was to understand the long-term changes in marine ecosystems. A ratio-to-moving average method was used in conjunction with adjusted seasonal indices to determine the seasonality of individual catch items and to examine the trends shown by the species with the same seasonality. Over the 48-year timespan of the data, 31 species, i.e., 64% of the total number of species, were identified as seasonal migrants. The catch ratio for species showing a single peak in the spring increased steadily over time; however, those species with a single peak in the winter decreased. The catch ratio for those species with dual peaks in both summer and fall varied greatly before 1978. Increasing trends began in the 1980s and accelerated until 1998. As a result of this increase, the previous concentration of the fishing season in the winter months became highly diffuse. Additionally, the winter and/or spring species continued to decrease year after year as the summer and/or autumn species gradually came to dominate the catch. This change in fishing seasonality is likely not an anthropogenic effect. However, the change coincides with trends in sea surface temperature fluctuations. Such variation may not only cause structural change in marine ecosystems but can also significantly impact the economy and the livelihoods of those associated with the fishing trade. View Full-Text
Keywords: China Coastal Current (CCC); Kuroshio Current (KC); seasonality; sea surface temperature (sst); species composition; time series analysis China Coastal Current (CCC); Kuroshio Current (KC); seasonality; sea surface temperature (sst); species composition; time series analysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ho, C.-H.; Lu, H.-J.; He, J.-S.; Lan, K.-W.; Chen, J.-L. Changes in Patterns of Seasonality Shown by Migratory Fish under Global Warming: Evidence from Catch Data of Taiwan’s Coastal Fisheries. Sustainability 2016, 8, 273.

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