Can Fishing Pressure Invert the Outcome of Interspecific Competition? The Case of the Thiof and of the Octopus Along the Senegalese Coast

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• 作者：Thuy Nguyen-Phuong ; Doanh Nguyen-Ngoc ; Pierre Auger ; Sidy Ly…
• 关键词：Competition ; Refuge ; Density ; dependent migration ; Density ; independent migration ; Fishing pressure
• 刊名：Acta Biotheoretica
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：64
• 期：4
• 页码：519-536
• 全文大小：
• 刊物类别：Humanities, Social Sciences and Law
• 刊物主题：Philosophy of Biology; Evolutionary Biology;
• 出版者：Springer Netherlands
• ISSN：1572-8358
• 卷排序：64

文摘

We present a mathematical model of two competing marine species that are harvested. We consider three models according to different levels of complexity, without and with species refuge and density-independent and density-dependent species movement between fishing area and refuge. We particularly study the effects of the fishing pressure on the outcome of the competition. We focus on conditions that allow an inferior competitor to invade as a result of fishing pressure. The model is discussed in relationship to the case of the thiof and the octopus along the Atlantic West African coast. At the origin, the thiof was abundant and the octopus scarce in that region. Since, the fishing pressure has strongly increased in some fishing areas leading to the depletion of the thiof and the invasion of its competitor, the octopus.