Unified spatial scaling of species and their trophic interactions

Ulrich Brose (), Annette Ostling, Kateri Harrison and Neo D. Martinez
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Ulrich Brose: San Francisco State University
Annette Ostling: University of California
Kateri Harrison: Rocky Mountain Biological Laboratory
Neo D. Martinez: Rocky Mountain Biological Laboratory

Nature, 2004, vol. 428, issue 6979, 167-171

Abstract: Abstract Two largely independent bodies of scaling theory address the quantitative relationships between habitat area, species diversity and trophic interactions. Spatial theory within macroecology addresses how species richness scales with area in landscapes, while typically ignoring interspecific interactions1,2,3,4,5,6. Complexity theory within community ecology addresses how trophic links scale with species richness in food webs, while typically ignoring spatial considerations7,8,9,10,11,12. Recent studies suggest unifying these theories by demonstrating how spatial patterns influence food-web structure13,14,15,16 and vice versa17. Here, we follow this suggestion by developing and empirically testing a more unified scaling theory. On the basis of power-law species–area relationships, we develop link–area and non-power-law link–species models that accurately predict how trophic links scale with area and species richness of microcosms, lakes and streams from community to metacommunity levels. In contrast to previous models that assume that species richness alone determines the number of trophic links7,8, these models include the species' spatial distribution, and hence extend the domain of complexity theory to metacommunity scales. This generality and predictive success shows how complexity theory and spatial theory can be unified into a much more general theory addressing new domains of ecology.

Date: 2004
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DOI: 10.1038/nature02297

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