Relationship between exploitation, oscillation, MSY and extinction

摘要: We give answers to two important problems arising in current fisheries: (i) how maximum sustainable yield (MSY) policy is influenced by the initial population level, and (ii) harvesting, oscillation MSY are related each other prey–predator systems. To examine impact of on exploitation, we analyze a single species model with strong Allee effect. It found that even when exists, dynamic solution may not converge equilibrium stock if level higher but near critical threshold level. In system effect prey species, does have such neither nor total (MSTY). However, harvesting top predator cause extinction all odd number trophic levels exist ecosystem. With regard second problem, study models establish increasing effort either prey, or both destroys previously existing oscillation. Moreover, at MSTY stable. also discuss validity results