Improved foraging by switching between diffusion and advection: benefits from movement that depends on spatial context
Improved foraging by switching between diffusion and advection: benefits from movement that depends on spatial context
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通过在扩散和平流之间切换来改善觅食：取决于空间背景的运动的好处
DOI：
10.1007/s12080-019-00434-w
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发表时间：
2020
影响因子：
1.6
通讯作者：
Cosner, Chris
中科院分区：
文献类型：
--
作者：
Fagan, William F.;Hoffman, Tyler;Dahiya, Daisy;Gurarie, Eliezer;Cantrell, Robert Stephen;Cosner, Chris
动物在不同的时间、不同的地点和不同的尺度上使用不同的运动方式。在数学模型中结合这种上下文依赖关系代表了复杂性的大幅增加，但创造了更充分地整合关键生物特征的机会。在这里，我们考虑具有两个亚单位的觅食种群的空间动态。在一个亚单位中，觅食者通过扩散（随机搜索）移动，而在另一个亚单位中，觅食者通过平流（梯度跟随搜索）移动。觅食者在亚单位之间来回切换，作为其空间环境的功能（即，取决于它们是在斑块内还是在斑块外，或者取决于它们是否能检测到资源密度的梯度）。我们考虑了资源斑块和非栖息地的一维二元景观，并根据移动觅食者与资源分布重叠的程度来衡量成功。相对于觅食者在任何时候都只混合平流和扩散模式时可能出现的空间重叠，主动地在分散模式之间切换有时会大大增强这种空间重叠。当有机体的梯度跟随能力相对于其整体运动能力而言较弱时，在运动模式之间切换是最有益的，但对于能够快速跟随资源梯度的生物体来说，切换实际上是非常有害的。当觅食者寻找资源时，生物体的感知范围在决定切换运动模式对其有利或不利的条件中起着关键作用。
Animals use different modes of movement at different times, in different locations, and on different scales. Incorporating such context dependence in mathematical models represents a substantial increase in complexity, but creates an opportunity to more fully integrate key biological features. Here, we consider the spatial dynamics of a population of foragers with two subunits. In one subunit, foragers move via diffusion (random search) whereas in the other, foragers move via advection (gradient-following search). Foragers switch back and forth between the subunits as functions of their spatial context (i.e., depending on whether they are inside or outside of a patch, or depending on whether or not they can detect a gradient in resource density). We consider a one-dimensional binary landscape of resource patches and non-habitat and gauge success in terms of how well the mobile foragers overlap with the distribution of resources. Actively switching between dispersal modes can sometimes greatly enhance this spatial overlap relative to the spatial overlap possible when foragers merely blend advection and diffusion modes at all times. Switching between movement modes is most beneficial when organism’s gradient-following abilities are weak compared to its overall capacity for movement, but switching can actually be quite detrimental for organisms that can rapidly follow resource gradients. An organism’s perceptual range plays a critical role in determining the conditions under which switching movement modes benefits versus disadvantages foragers as they seek out resources.
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影响因子：
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作者：
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影响因子：
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