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arXiv 1708.09472stat.AP
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迁徙个体和群体的动物运动模型

Animal Movement Models for Migratory Individuals and Groups

Mevin B. Hooten, Henry R. Scharf, Trevor J. Hefley, Aaron T. Pearse, Mitch D. Weegman

摘要:

动物在迁徙过程中经常表现出行为的变化。遥测数据提供了一种观察动物随时间变化的地理位置的方法,但不一定是运动过程的动态变化。连续时间模型允许在存在测量误差的情况下以及在遥测设备没有记录动物位置的时段期间对轨迹进行统计预测。然而,能够模拟具有足够细节的真实轨迹的连续时间模型在计算上具有挑战性,以适应大型数据集,并且基本模型在捕获非平稳动态的能力方面缺乏现实性。我们提出了一个统一的类的动物运动模型,计算效率高,并提供了一套方法,以适应非平稳连续轨迹,由于迁移和个人之间的相互作用。我们展示了如何嵌套卷积模型,将迁移个体之间的相互作用,以考虑非平稳性,并提供有关动态迁移网络的推断。我们在两个涉及候鸟的案例研究中展示了这些方法。具体来说,我们使用时间变形的过程卷积模型来解释欧洲和冰岛个体大白额鹅迁徙的异质性,我们使用嵌套过程卷积来模拟北美沙丘鹤的动态迁徙网络。我们提出的方法占动物运动的时间异质性的各种形式,并不限于迁移的应用。此外,我们的模型依赖于建立依赖数据模型的原则,并利用现代方法对动态网络进行建模,以帮助解释动物运动和社会互动。

英文摘要:

Animals often exhibit changes in their behavior during migration. Telemetry data provide a way to observe geographic position of animals over time, but not necessarily changes in the dynamics of the movement process. Continuous-time models allow for statistical predictions of the trajectory in the presence of measurement error and during periods when the telemetry device did not record the animal's position. However, continuous-time models capable of mimicking realistic trajectories with sufficient detail are computationally challenging to fit to large data sets and basic models lack realism in their ability to capture nonstationary dynamics. We present a unified class of animal movement models that are computationally efficient and provide a suite of approaches for accommodating nonstationarity in continuous trajectories due to migration and interactions among individuals. We show how to nest convolution models to incorporate interactions among migrating individuals to account for nonstationarity and provide inference about dynamic migratory networks. We demonstrate these approaches in two case studies involving migratory birds. Specifically, we used process convolution models with temporal deformation to account for heterogeneity in individual greater white-fronted goose migrations in Europe and Iceland and we used nested process convolutions to model dynamic migratory networks in sandhill cranes in North America. The approach we present accounts for various forms of temporal heterogeneity in animal movement and is not limited to migratory applications. Furthermore, our models rely on well-established principles for modeling dependent data and leverage modern approaches for modeling dynamic networks to help explain animal movement and social interaction.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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