title: Evidence for the existence of a robust pattern of prey selection in food webs.
abstract: Food webs aim to provide a thorough representation of the trophic interactions found in an ecosystem. The complexity of empirical food webs, however, is leading many ecologists to focus dynamic ecosystem studies on smaller microcosm or mesocosm studies based upon community modules, which comprise three to five species and the interactions likely to have ecological relevance. We provide here a structural counterpart to community modules. We investigate food-web 'motifs' which are n-species connected subgraphs found within the food web. Remarkably, we find that the over- and under-representation of three-species motifs in empirical food webs can be understood through comparison to a static food-web model, the niche model. Our result conclusively demonstrates that predation upon species with some 'characteristic' niche value is the prey selection mechanism consistent with the structural properties of empirical food webs.
authors.affiliation: Department of Chemical and Biological Engineering, Northwestern University, Evanston, IL 60208, USA. d-stouffer@northwestern.edu
authors.forename: Daniel B
authors.initials: DB
authors.lastname: Stouffer
authors.forename: Juan
authors.initials: J
authors.lastname: Camacho
authors.forename: Wenxin
authors.initials: W
authors.lastname: Jiang
authors.forename: Luís A Nunes
authors.initials: LA
authors.lastname: Amaral
mesh_terms: D000818:Animals; D017753:Ecosystem; D020387:Food Chain; D008954:Models, Biological; D011235:Predatory Behavior