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

Type Article
Date 2016-12
Language English
Author(s) Nguyen-Phuong Thuy1, Nguyen-Ngoc Doanh2, 3, Auger PierreORCID4, 5, Ly Sidy6, Jouffre Didier7
Affiliation(s) 1 : Hanoi Univ Sci & Technol, Sch Appl Math & Informat, 1 Dai Co Viet St, Hanoi, Vietnam.
2 : Thuyloi Univ, Fac Comp Sci & Engn, 175 Tay Son St, Hanoi, Vietnam.
3 : IRD UPMC Paris 6, UMI UMMISCO 209, 32 Ave Henri Varagnat, F-93143 Bondy, France.
4 : Sorbonne Univ, Univ Paris 06, IRD, UMI 209, Bondy, France.
5 : Univ Cheick Anta Diop, UMI IRD UMMISCO UCAD 209, Dakar, Senegal.
6 : Univ Cheikh Anta Diop, FASEG LMDAN, Dakar, Senegal.
7 : IRD, LABEP AO IRD IFAN, UMR MARBEC 248, BP 1386, Dakar, Senegal.
Meeting 35th Workshop of the Societe-Francophone-de-Biologie-Theorique, Univ Hosp, Med Sch, Poitiers, FRANCE, JUN 22-25, 2015
Source Acta Biotheoretica (0001-5342) (Springer), 2016-12 , Vol. 64 , N. 4 , P. 519-536
DOI 10.1007/s10441-016-9292-1
WOS© Times Cited 1
Keyword(s) Competition, Refuge, Density-dependent migration, Density-independent migration, Fishing pressure

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.

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