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Biodiversity mediates top–down control in eelgrass ecosystems: a global comparative‐experimental approach

AbstractNutrient pollution and reduced grazing each can stimulate algal blooms as shown by numerous experiments. But because experiments rarely incorporate natural variation in environmental factors and biodiversity, conditions determining the relative strength of bottom–up and top–down forcing remain unresolved. We factorially added nutrients and reduced grazing at 15 sites across the range of the marine foundation species eelgrass (Zostera marina) to quantify how top–down and bottom–up control interact with natural gradients in biodiversity and environmental forcing. Experiments confirmed modest top–down control of algae, whereas fertilisation had no general effect. Unexpectedly, grazer and algal biomass were better predicted by cross‐site variation in grazer and eelgrass diversity than by global environmental gradients. Moreover, these large‐scale patterns corresponded strikingly with prior small‐scale experiments. Our results link global and local evidence that biodiversity and top–down control strongly influence functioning of threatened seagrass ecosystems, and suggest that biodiversity is comparably important to global change stressors.
- Washington State University United States
- University of Mary United States
- Cornell University United States
- Hokkaido Bunkyo University Japan
- Virginia Institute of Marine Science United States
Food Chain, Genotype, Nutrient enrichment, Functional-role, Gastropoda, Population Dynamics, DIVERSITY, Community, Models, Biological, Océanographie, Zostera-Marina, Microsatellite Loci, ZOSTERA-MARINA, Crustacea, Microalgae, Animals, Biomass, Herbivory, SEAGRASS ECOSYSTEM, Diversity, NUTRIENT ENRICHMENT, Zosteraceae, Populations, Biodiversity, Eutrophication, Seagrass ecosystem, FUNCTIONAL-ROLE, COMMUNITY, Biologie et autres sciences connexes, TROPHIC INTERACTIONS, MICROSATELLITE LOCI, EUTROPHICATION, POPULATIONS, Trophic interactions
Food Chain, Genotype, Nutrient enrichment, Functional-role, Gastropoda, Population Dynamics, DIVERSITY, Community, Models, Biological, Océanographie, Zostera-Marina, Microsatellite Loci, ZOSTERA-MARINA, Crustacea, Microalgae, Animals, Biomass, Herbivory, SEAGRASS ECOSYSTEM, Diversity, NUTRIENT ENRICHMENT, Zosteraceae, Populations, Biodiversity, Eutrophication, Seagrass ecosystem, FUNCTIONAL-ROLE, COMMUNITY, Biologie et autres sciences connexes, TROPHIC INTERACTIONS, MICROSATELLITE LOCI, EUTROPHICATION, POPULATIONS, Trophic interactions
citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).190 popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.Top 1% influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).Top 10% impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.Top 1% visibility views 70 download downloads 135 - 70views135downloads
Data source Views Downloads Sapientia Repositório da Universidade do Algarve 70 135


