Spatial patterns and coexistence mechanisms in systems with unidirectional flow
Spatial patterns and coexistence mechanisms in systems with unidirectional flow
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DOI：
10.1016/j.tpb.2006.11.006
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发表时间：
2007-05-01
影响因子：
1.4
通讯作者：
Lewis, Mark A.
中科院分区：
文献类型：
--
作者：
Lutscher, Frithjof;McCauley, Edward;Lewis, Mark A.
河流生态系统是单向流动影响个体扩散的环境的主要例子。群落组成和物种更替的空间格局来自水文、地球化学、生物和生态因素的复杂相互作用。影响藻类动态的局部过程是很好的理解，但缺乏大规模新兴模式的机械基础。为了理解这些模式如何出现在河流中，我们分析了一个反应-平流-扩散模型的两个竞争对手在异质环境中。该模型支持波入侵上游到一个明确定义的“上游入侵限制”。我们将讨论这些波是如何产生的，并介绍它们的关键特性。我们认为，模式的物种替换和共存沿着空间轴反映停滞波，产生的扩散，平流和物种的相互作用。出现的空间尺度是合理的参数估计附着生物。我们的研究结果适用于其他系统的单向流动，如盛行风或气候变化的情况。(C)2006年爱思唯尔公司All rights reserved.
River ecosystems are the prime example of environments where unidirectional flow influences the dispersal of individuals. Spatial patterns of community composition and species replacement emerge from complex interplays of hydrological, geochemical, biological, and ecological factors. Local processes affecting algal dynamics are well understood, but a mechanistic basis for large scale emerging patterns is lacking. To understand how these patterns could emerge in rivers, we analyze a reaction-advection-diffusion model for two competitors in heterogeneous environments. The model supports waves that invade upstream up to a well-defined "upstream invasion limit". We discuss how these waves are produced and present their key properties. We suggest that patterns of species replacement and coexistence along spatial axes reflect stalled waves, produced from diffusion, advection, and species interactions. Emergent spatial scales are plausible given parameter estimates for periphyton. Our results apply to other systems with unidirectional flow such as prevailing winds or climate-change scenarios. (C) 2006 Elsevier Inc. All rights reserved.