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• W2913869227 abstract "Organismal traits and their evolution can strongly influence food web structure and dynamics. To what extent the evolution of such traits impacts food web structure, however, is poorly understood. Here, we investigate a simple three-species omnivory food web module where the attack rates of all predators evolve as ecological dynamics unfold, such that predator trophic levels are themselves dynamic. We assume a timescale where other vital rates that govern population dynamics are constant and incorporate a well-known tradeoff between attack rates and the conversion of prey biomass into predators. We show that this eco-evolutionary model yields a surprisingly rich array of dynamics. Moreover, even small amounts of selection lead to important differences in the abundance, trophic and biomass structure of the food web. Systems in which intermediate predators are strongly constrained by tradeoffs lead to hourglass-shaped food webs, where basal resources and top predators have large abundances, but intermediate predators are rare, like those observed in some marine ecosystems. Such food webs are also characterized by a relatively low maximum trophic level. Systems in which intermediate predators have weaker tradeoffs, lead to pyramid-shaped food webs, where basal resources are more abundant than intermediate and top predators, like those observed in some terrestrial system. Such food webs had a relatively larger maximum trophic level as well. Overall, our results suggest that eco-evolutionary dynamics can strongly influence the abundance-, trophic-, and biomass-structure of food webs, even in the presence of small levels of selection, thus stressing the importance of taking traits and trait evolution into account to further understand community-level patterns and processes." @default.
• W2913869227 created "2019-02-21" @default.
• W2913869227 creator A5021281308 @default.
• W2913869227 creator A5061462552 @default.
• W2913869227 date "2019-02-07" @default.
• W2913869227 modified "2023-10-18" @default.
• W2913869227 title "Eco-Evolutionary Origins of Diverse Abundance, Biomass, and Trophic Structures in Food Webs" @default.
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