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arXiv 1606.09585stat.ME
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用于种群水平推断的分层动物运动模型

Hierarchical animal movement models for population-level inference

Mevin B. Hooten, Frances E. Buderman, Brian M. Brost, Ephraim M. Hanks, Jacob S. Ivan

摘要:

基于遥测数据的动物运动建模的新方法定期开发。随着遥测能力的进步,动物运动模型变得越来越复杂。尽管需要群体水平的推理,动物运动模型仍然主要是为个体水平的推理而开发的。大多数将推理提升到群体级别的努力要么是事后的,要么是足够复杂,只有开发人员才能实现模型。分层贝叶斯模型为群体水平动物运动模型的开发提供了一个理想的平台,但由于计算限制或需要大量调整,拟合起来可能具有挑战性。我们提出了一个两阶段的程序拟合分层动物运动模型的遥测数据。两阶段的方法在统计上是严格的,并允许一个单独适合个人水平的运动模型,然后使用二次MCMC算法重新采样。两阶段方法的主要优点是,第一阶段很容易并行化,第二阶段是完全无监督的,在许多情况下允许完全自动化的拟合过程。我们展示了两个阶段的程序与动物运动模型的两个应用程序。第一个应用程序涉及到一个空间点处理方法来建模遥测数据,第二个涉及到一个更复杂的连续时间离散空间动物运动模型。我们适合这些模型的模拟数据和真正的遥测数据所产生的人口监测加拿大猞猁在美国科罗拉多州。

英文摘要:

New methods for modeling animal movement based on telemetry data are developed regularly. With advances in telemetry capabilities, animal movement models are becoming increasingly sophisticated. Despite a need for population-level inference, animal movement models are still predominantly developed for individual-level inference. Most efforts to upscale the inference to the population-level are either post hoc or complicated enough that only the developer can implement the model. Hierarchical Bayesian models provide an ideal platform for the development of population-level animal movement models but can be challenging to fit due to computational limitations or extensive tuning required. We propose a two-stage procedure for fitting hierarchical animal movement models to telemetry data. The two-stage approach is statistically rigorous and allows one to fit individual-level movement models separately, then resample them using a secondary MCMC algorithm. The primary advantages of the two-stage approach are that the first stage is easily parallelizable and the second stage is completely unsupervised, allowing for a completely automated fitting procedure in many cases. We demonstrate the two-stage procedure with two applications of animal movement models. The first application involves a spatial point process approach to modeling telemetry data and the second involves a more complicated continuous-time discrete-space animal movement model. We fit these models to simulated data and real telemetry data arising from a population of monitored Canada lynx in Colorado, USA.

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