Resource distribution and internal factors interact to govern movement of a freshwater snail

C. Cloyed, A. Dell
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引用次数: 12

Abstract

Movement enables mobile organisms to respond to local environmental conditions and is driven by a combination of external and internal factors operating at multiple scales. Here, we explored how resource distribution interacted with the internal state of organisms to drive patterns of movement. Specifically, we tracked snail movements on experimental landscapes where resource (algal biofilm) distribution varied from 0 to 100% coverage and quantified how that movement changed over a 24 h period. Resource distribution strongly affected snail movement. Trajectories were tortuous (i.e. Brownian-like) within resource patches but straighter (i.e. Lévy) in resource-free (bare) patches. The average snail speed was slower in resource patches, where snails spent most of their time. Different patterns of movement between resource and bare patches explained movement at larger spatial scales; movement was ballistic-like Lévy in resource-free landscapes, Lévy in landscapes with intermediate resource coverage and approximated Brownian in landscapes covered in resources. Our temporal analysis revealed that movement patterns changed predictably for snails that satiated their hunger and then performed other behaviours. These changes in movement patterns through time were similar across all treatments that contained resources. Thus, external and internal factors interacted to shape the inherently flexible movement of these snails.
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淡水蜗牛的运动受资源分布和内部因素的影响
运动使可移动的生物能够对当地环境条件做出反应,并由多种尺度的外部和内部因素共同驱动。在这里,我们探索了资源分配如何与生物体的内部状态相互作用,以驱动运动模式。具体来说,我们跟踪了资源(藻类生物膜)分布从0到100%覆盖的实验景观上蜗牛的运动,并量化了这种运动在24小时内的变化。资源分布强烈影响蜗牛运动。在资源斑块内,轨迹是曲折的(即布朗样),而在无资源(光秃秃)斑块中,轨迹则是笔直的(即lcv)。在资源斑块中,蜗牛的平均速度较慢,蜗牛在那里度过了大部分时间。资源斑块与光斑之间的不同运动模式解释了更大空间尺度上的运动;在资源无覆盖的景观中,运动表现为弹道型的lcv,在资源覆盖的景观中表现为lcv,在资源覆盖的景观中表现为近似布朗型的lcv。我们的时间分析显示,蜗牛的运动模式发生了可预测的变化,它们满足了饥饿,然后进行其他行为。这些运动模式随时间的变化在所有含有资源的治疗中都是相似的。因此,外部和内部因素相互作用,塑造了这些蜗牛固有的灵活运动。
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