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Spatial scaling of consumer-resource interactions in advection-dominated systems
Umeå University, Faculty of Science and Technology, Ecology and Environmental Science.
2006 (English)In: American Naturalist, Vol. 168, no 3, 358-372 p.Article in journal (Refereed) Published
Abstract [en]

Ecologists studying consumer-resource interactions in advection-dominated systems such as streams and rivers frequently seek to link the results of small-scale experiments with larger-scale patterns of distribution and abundance. Accomplishing this goal requires determining the characteristic scale, termed the response length, at which there is a shift from local dynamics dominated by advective dispersal to larger-scale dynamics dominated by births and deaths. Here, we model the dynamics of consumer-resource systems in a spatially variable, advective environment and show how consumer-resource interactions alter the response length relative to its single-species value. For one case involving a grazer that emigrates in response to high predator density, we quantify the changes using published data from small-scale experiments on aquatic invertebrates. Using Fourier analysis, we describe the responses of advection-dominated consumer-resource systems to spatially extended environmental variability in a way that involves explicit consideration of the response length. The patterns we derive for different consumer-resource systems exhibit important similarities in how component populations respond to spatial environmental variability affecting dispersal as opposed to demographic parameters.

Place, publisher, year, edition, pages
2006. Vol. 168, no 3, 358-372 p.
National Category
URN: urn:nbn:se:umu:diva-31478ISI: 000240600200008ISBN: 0003-0147OAI: diva2:293186
Anderson, Kurt E. Nisbet, Roger M. Diehl, SebastianAvailable from: 2010-02-10 Created: 2010-02-10 Last updated: 2010-02-10

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