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Influences of Movement Behavior on Animal Distributions at Edges of Homogeneous Patches

机译:运动行为对同质斑块边缘动物分布的影响

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We propose that changes in movement behavior may be a proximate mechanism that influences the accumulation of animals at habitat edges. We tested this idea with a combination of empirical and simulation experiments in a resource-free landscape. The movements of individual flour beetles, Tribolium confusum, were tracked across a paper arena edged with invisible tape until beetles crossed the edge. Movement behavior (step lengths and turn angles) and cumulative occupancy were analyzed according to distance from the edge. We found that beetles took smaller steps with larger turn angles near edges than in the center of the arena and that beetle distribution was highly biased towards the edge of the arena. We then tested two agent-based simulation modelsfor each beetle: an edge-independent model and an edge-dependent model. Both models predicted less time spent at the edge than was observed. The proportion of time spent at edges depended on the propensity to cross the edge, which could not be explainedby beetle body size or energetic condition. The distribution of animals with respect to habitat edges depends on many factors, but we suggest that proximate mechanisms such as movement behavior should be explicitly considered when interpreting animal distributions.
机译:我们提出运动行为的改变可能是影响动物在栖息地边缘积累的一种重要机制。我们在无资源的环境中结合经验和模拟实验测试了这个想法。在不透明胶带边缘的纸竞技场上跟踪单个面粉甲虫Tribolium confusum的运动,直到甲虫越过边缘。根据与边缘的距离来分析运动行为(步长和转弯角度)以及累积占用率。我们发现,甲虫在靠近边缘处比在竞技场中心处走的步伐较小,且具有较大的转角,并且甲虫的分布高度偏向于竞技场的边缘。然后,我们为每个甲虫测试了两个基于代理的仿真模型:独立于边缘的模型和独立于边缘的模型。两种模型都预测在边缘花费的时间少于观察到的时间。花在边缘的时间比例取决于穿过边缘的倾向,这不能由甲虫的体型或精力充沛的条件来解释。动物相对于栖息地边缘的分布取决于许多因素,但我们建议在解释动物分布时应明确考虑诸如运动行为等邻近机制。

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