How Flow Speed Alters Competitive Outcome in Advective Environments

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• 作者：Olga Vasilyeva (1)
  Frithjof Lutscher (1)
  
• 关键词：Competition ; Advection
• 刊名：Bulletin of Mathematical Biology
• 出版年：2012
• 出版时间：December 2012
• 年：2012
• 卷：74
• 期：12
• 页码：2935-2958
• 全文大小：1041KB
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• 作者单位：Olga Vasilyeva (1)
  Frithjof Lutscher (1)
  
  1. Department of Mathematics and Statistics, University of Ottawa, Ottawa, ON, K1N6N5, Canada
  
• ISSN：1522-9602

文摘

Many species live in advective environments, such as rivers or streams. The community composition in such environments is shaped by the interplay between biotic interactions and hydrologic constraints. Lutscher et al.聽(Theor.聽Popul.聽Biol. 71:267鈥?77, 2007) demonstrated by simulation that advective flow can shift competitive outcome from one species dominating to coexistence or even to the other species dominating. Here, we present a detailed analysis of the Lotka鈥揤olterra advection-diffusion model underlying their simulations. We use variational techniques as well as a spatially implicit approximation to determine all possible advection-induced shifts in competitive outcome. We show that changes in advection follow relatively few and predictable paths. We illustrate our results in various bifurcation diagrams.