@article{oai:nagasaki-u.repo.nii.ac.jp:00027157,
 author = {池戸, 蒼真 and 清田, 雅史},
 journal = {長崎大学水産学部研究報告, Bulletin of the Faculty of Fisheries Nagasaki University},
 month = {},
 note = {This paper aims to understand the long-term change and current status of fisheries in eight subregions of Nagasaki Prefecture on the basis of catch statistics from 1965 to 2018. Total catch amounts generally decreased after 2000 in all subregions. The cluster analysis of average catch compositions revealed three clusters (Iki and Tsushima; Seihi, Hokusho and Goto; Ariake bay, Omura bay and Tachibana bay) characterized by dominant fisheries and catch species. Four ecosystem indicators, i.e., species diversity index, Mean Trophic Level of Catch (MTLc), Primary Production Required (PPR) and Loss in Secondary Production (LSP), were analyzed to visualize the subregional differences in ecosystem changes and fishery impacts. The species diversity index and MTLc did not show clear decreasing trends in any subregions. The scatter plots of log transformed PPR and LSP were informative in demonstrating the expanding/contracting trends of catches and/or shifts in trophic position of the fishery removals. These results, combined with the information obtained through the interview with local fishermen, suggest that recent reduction of fishery catch in Nagasaki prefecture was not caused by shrinking fishing efforts but by reduced productivity of the coastal ecosystems., 長崎大学水産学部研究報告, 102, pp.1-14; 2022},
 pages = {1--14},
 title = {長崎県各地域の沿岸漁業における漁獲物構成と生態系影響の長期変化},
 volume = {102},
 year = {2022}
}