Central place foragers and moving stimuli: a hidden-state model to discriminate the processes affecting movement

1. Human activities can influence the movement of organisms, either repelling or attracting individuals depending on whether they interfere with natural behavioural patterns or enhance access to food. To discern the processes affecting such interactions, an appropriate analytical approach must reflect the motivations driving behavioural decisions at multiple scales.
2. In this study, we developed a modelling framework for the analysis of foraging trips by central place foragers. By recognising the distinction between movement phases at a larger scale and movement steps at a finer scale, our model can identify periods when animals are actively following moving attractors in their landscape.
3. We applied the framework to GPS tracking data of northern fulmars Fulmarus glacialis, paired with contemporaneous fishing boat locations, to quantify the putative scavenging activity of these seabirds on discarded fish and offal. We estimated the rate and scale of interaction between individual b...

1. 人类活动可影响生物的移动行为，其对生物个体的作用效果可分为驱离与吸引两类，具体取决于人类活动是否干扰了生物的自然行为模式，或是提升了其获取食物的途径。为厘清调控这类交互过程的内在机制，恰当的分析方法需能够体现多尺度下驱动生物行为决策的核心动机。
2. 本研究构建了一套面向中央 place觅食者（central place foragers）觅食行程的建模分析框架。通过区分大尺度下的移动阶段与细尺度下的移动步次，该模型可精准识别出海鸟在其栖息景观中主动追踪移动觅食吸引源的时段。
3. 我们将该框架应用于北管鼻藿（Fulmarus glacialis）的GPS追踪数据集，并同步匹配同期渔船位置信息，以量化这类海鸟对丢弃鱼类及内脏废弃物的推测食腐活动。我们估算了个体间交互的速率与尺度……