In this paper, regarding the influence of infectious diseases on the dynamics of host population growth, a PDE model is established for the dynamics of infectious diseases with lifelong immunity.

在本文中，考虑到传染病对宿主生物群体生长动力学的影响，对终身免疫型传染病的动力学建立了一个偏微分方程的模型。

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The results tested the pest data showed that the new method may be tried for the mid term or long term forecasting of the population dynamics of insect pests, and it is a good model for application.

研究结果表明，该预测模型为农业害虫种群动态的中长期预测预报提供了一种新的研究方法，是一种优良的模型。

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This paper deduces a theoretical population model in a urban system under a hypothetical condition of zero population growth (ZPG), and analyses the population dynamics for the model.

本文推演了城市系统中在人口零增长假设条件下的人口迁移理论模型；

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In a study published last year in Conservation Letters, a group of scientists led by Brian MacKenzie, of the Technical University of Denmark, describe how they ran a computer model of the bluefin tuna's population dynamics.

ECONOMIST: Efforts to ban the international trade in bluefin tuna

In addition, they used a "population dynamics" model describing the mating patterns and breeding success of emperor penguins.

BBC: Emperor penguins face extinction