Abstract

Objective: To study the impact of the change of sex ratio of lamprey on the whole ecosystem, and to provide guidance for the stability of the ecosystem, the conservation of species diversity, and the green and sustainable development of the ecological environment in the future. Methods: In the first step, the logistic regression model was used to study the population dynamics of lamprey from the aspects of birth rate, mortality rate, food source rate and dependent population, and the impact of sex ratio change on the ecosystem was observed. In the second step, the impact of sex ratio change on the stability of the whole ecosystem was studied through the adjoint model. In the third step, the logistic regression model was used to construct a differential equation describing female and male lamp eels in different environments to distinguish the different sexes of lampreys. In the fourth step, an ecological dynamics model was established that comprehensively considered factors such as intermediate hosts, biological subpopulations, environmental conditions, and self-competition to fully understand the impact of changes in the sex ratio of lampreys on ecosystem stability. Finally, the sensitivity analysis of the model was carried out, and the model was evaluated and expanded. Results: A model was established to affect the population dynamics of lamprey, the gender differentiation of lamprey and the influence of lamprey on ecosystem stability. Conclusion: It was found that changes in the sex ratio of lamprey populations would affect their own reproduction rate and population size, the survival and reproduction patterns of other species, and the stability of the whole ecosystem.