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An individual-based approach to population dynamics with applications to sockeye salmon and iteroparous organisms.

机译：一种基于个体的种群动态方法，应用于红鲑鱼和异种生物。

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摘要

Individual-based models have been used to study the population dynamics of semelparous and iteroparous organisms. The first model, developed for sockeye salmon (Oncorhynchus nerka), was based on the physiology of the individual and incorporated into a population model via a McKendrick-von Foerster type partial differential equation. Cycles of population abundance historically found in the Fraser River system were recreated through model simulations. Explanations for the appearance of the cycling were investigated and tested. The results showed that density- and size-dependent mortality were not necessary for cycling to appear, however their inclusion or exclusion in combination with the type of schooling could alter the character of the periodic cycling.;The use of sequential design of experiments as a method for sensitivity analysis of the model allowed for a thorough investigation of the parameter space. The approach combined standard and non-standard designs and used reverse methodology to screen for insignificant factors. The resulting sequence of designs isolated the sensitive parameters and allowed for realistic model output.;The second individual-based model was used to study iteroparous reproduction strategies and population dynamics. Two population models were formulated, a set of continuous partial differential equations of the McKendrick-von Foerster type and a set of discrete matrix equations. The asymptotic relationship between the two types of models was evaluated. It was found that a lack of convergence to the steady-state age distribution can occur in discrete event reproduction models and that convergence depends on whether the ratio between the maximum age and the length of the reproductive period is rational.
机译：基于个体的模型已被用于研究同种和同种生物的种群动态。为红鲑鱼（Oncorhynchus nerka）开发的第一个模型基于个体的生理学，并通过McKendrick-von Foerster型偏微分方程纳入人口模型。历史上在弗雷泽河系统中发现的人口丰度循环是通过模型模拟重建的。调查并测试了有关自行车外观的说明。结果表明，密度和大小依赖的死亡率并不是出现自行车的必要条件，但是将其包括在内或排除在外与学校教育类型可能会改变周期性自行车的特征。该模型的灵敏度分析方法允许对参数空间进行彻底研究。该方法结合了标准和非标准设计，并使用了反向方法来筛选无关紧要的因素。设计的结果序列隔离了敏感参数，并允许现实的模型输出。第二个基于个人的模型用于研究异头繁殖策略和种群动态。制定了两个总体模型，一组McKendrick-von Foerster类型的连续偏微分方程组和一组离散矩阵方程组。评估了两种类型模型之间的渐近关系。发现在离散事件再现模型中可能会出现稳态年龄分布的收敛性不足，并且收敛性取决于最大年龄与生殖期长度之间的比率是否合理。

著录项

  • 作者

    Krohn, Cynthia Moira.;

  • 作者单位

    The University of Tennessee.;

  • 授予单位 The University of Tennessee.;
  • 学科 Mathematics.;Aquatic sciences.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 199 p.
  • 总页数 199
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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