title: Diversity, functional similarity, and top-down control drive synchronization and the reliability of ecosystem function.
abstract: The concept that diversity promotes reliability of ecosystem function depends on the pattern that community-level biomass shows lower temporal variability than species-level biomasses. However, this pattern is not universal, as it relies on compensatory or independent species dynamics. When in contrast within-trophic level synchronization occurs, variability of community biomass will approach population-level variability. Current knowledge fails to integrate how species richness, functional distance between species, and the relative importance of predation and competition combine to drive synchronization at different trophic levels. Here we clarify these mechanisms. Intense competition promotes compensatory dynamics in prey, but predators may at the same time increasingly synchronize, under increasing species richness and functional similarity. In contrast, predators and prey both show perfect synchronization under strong top-down control, which is promoted by a combination of low functional distance and high net growth potential of predators. Under such conditions, community-level biomass variability peaks, with major negative consequences for reliability of ecosystem function.
authors.affiliation: Department of Ecology and Ecosystem Modeling, Institute for Biochemistry and Biology, University of Potsdam, Am Neuen Palais 10, D-14469 Potsdam, Germany.
authors.forename: Barbara
authors.initials: B
authors.lastname: Bauer
authors.forename: Matthijs
authors.initials: M
authors.lastname: Vos
authors.forename: Toni
authors.initials: T
authors.lastname: Klauschies
authors.forename: Ursula
authors.initials: U
authors.lastname: Gaedke
mesh_terms: D044822:Biodiversity; D016798:Ciliophora / Q000502:physiology*; D017753:Ecosystem; D020387:Food Chain; D008954:Models, Biological; D010839:Phytoplankton / Q000502:physiology*; D011157:Population Dynamics