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Diversity-Function Relationships Changed In A Long-Term Restoration Experiment, James M. Doherty, John Callaway, Joy B. Zedler
Diversity-Function Relationships Changed In A Long-Term Restoration Experiment, James M. Doherty, John Callaway, Joy B. Zedler
Environmental Science
The central tenet of biodiversity-ecosystem function (BEF) theory, that species richness increases function, could motivate restoration practitioners to incorporate a greater number of species into their projects. But it is not yet clear how well BEF theory predicts outcomes of restoration, because it has been developed through tests involving short-run and tightly controlled (e.g., weeded) experiments. Thus, we resampled our 1997 BEF experiment in a restored salt marsh to test for long-term effects of species richness (plantings with 1, 3, and 6 species per 2 x 2 m plot), with multiple ecosystem functions as response variables. Over 11 years, 1- …
Plant Assemblage Composition Explains And Predicts How Biodiversity Affects Salt Marsh Functioning, Gary Sullivan, John Callaway, Joy B. Zedler
Plant Assemblage Composition Explains And Predicts How Biodiversity Affects Salt Marsh Functioning, Gary Sullivan, John Callaway, Joy B. Zedler
Environmental Science
Knowing that diverse plantings enhanced biomass and nitrogen (N) accumulation in a restored California salt marsh, we asked if the “biodiversity effect” was due to species selection or complementarity. In a two-year greenhouse experiment, we found positive biodiversity effects on total, root, and shoot biomass, total and root N crop, and on biomass and N allocation; negative effects on root and shoot N concentration; and no effect on shoot N crop. Overyielding among trios and sextets was supported by significant deviations in observed yield from that expected relative to solo yields (DT). However, both trios and sextets …