Matsuda和Abrams(TheorPopulBiol45(1):76-91,1994)通过进化开始了物种自我灭绝的探索,重点关注具有不断变化的觅食特性的猎物-捕食者系统中灭绝边界附近突变体的有利位置。以前的模型缺乏对收获的长期影响的理论研究。在我们的模型中,我们引入了持续努力的猎物和捕食者的收获,随着捕食者个体的后勤增长。该模型揭示了两个不同的进化结果:(I)进化自杀,以鞍节分叉为标志,其中猎物灭绝是由较低的觅食突变体的入侵引起的;(ii)进化逆转,以亚临界Hopf分叉为特征,导致周期性的猎物进化。采用基于Gröbner基础计算的创新方法,我们识别各种分叉流形,包括折叠,超临界,尖点,Hopf,和Bogdanov-Takens分叉.这些对比场景来自收获参数的变化,同时保持其他因素不变,使模型成为一个有趣的研究主题。
Matsuda and Abrams (Theor Popul Biol 45(1):76-91, 1994) initiated the exploration of self-extinction in species through evolution, focusing on the advantageous position of mutants near the extinction boundary in a prey-predator system with evolving foraging traits. Previous models lacked theoretical investigation into the long-term effects of harvesting. In our model, we introduce constant-effort prey and predator harvesting, along with individual logistic growth of predators. The model reveals two distinct evolutionary outcomes: (i) Evolutionary suicide, marked by a saddle-node bifurcation, where prey extinction results from the invasion of a lower forager mutant; and (ii) Evolutionary reversal, characterized by a subcritical Hopf bifurcation, leading to cyclic prey evolution. Employing an innovative approach based on Gröbner basis computation, we identify various bifurcation manifolds, including fold, transcritical, cusp, Hopf, and Bogdanov-Takens bifurcations. These contrasting scenarios emerge from variations in harvesting parameters while keeping other factors constant, rendering the model an intriguing subject of study.