Long-term changes and recurrent patterns in fisheries landings from Large Marine Ecosystems (1950-2004)

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• 作者：Lorenza Conti^a ; ^b ; ^{lorenza.conti@cict.fr} ; Gaë ; l Grenouillet^b ; Sovan Lek^b ; Michele Scardi^c
• 关键词：Large Marine Ecosystems ; Functional groups ; Self Organizing Maps ; Time series
• 刊名：Fisheries Research
• 出版年：2012
• 期刊代码：45_01657836
• 类别：abs
• 出版时间：May, 2012
• 卷：119-120
• 期：Complete
• 页码：1-12
• 文件大小：2179 K

摘要

The regional dynamics of industrial fisheries within Large Marine Ecosystems (LMEs) boundaries were investigated by means of a historical-descriptive approach. Landings data from the Sea Around Us Project database were used to detect trends in total yields and variations in landings composition by functional groups over time. The temporal and spatial scales covered by this study allowed general issues to be addressed such as the detection of recurrent patterns and synchronies in fisheries landings. An unsupervised artificial neural network, Self Organizing Map (SOM), is used as a tool to analyze fisheries landings composition variation over five decades in 51 LMEs all over the world. From the historical analysis of 鈥渇ishing behaviors鈥?within LMEs a broad distinction between two main types of fisheries emerged: (1) small and medium pelagics fisheries, with stable compositions or cyclic behaviors, occurred in LMEs which share common productive features, despite different geographical locations and (2) demersal fisheries, which are more affected by economic drivers and tend to concentrate in LMEs in the Northern Hemisphere. Our analysis can be regarded as a first step towards the challenging scope of describing the relative influence of environmental and economic drivers on exploited ecosystems.