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

Duffy J. Emmett, Reynolds Pamela L., Boström Christoffer, Coyer James A., Cusson Mathieu, Donadi Serena, Douglass James G., Eklöf Johan S., Engelen Aschwin H., Eriksson Britas Klemens, Fredriksen Stein, Gamfeldt Lars, Gustafsson Camilla, Hoarau Galice, Hori Masakazu, Hovel Kevin, Iken Katrin, Lefcheck Jonathan S., Moksnes Per-Olav, Nakaoka Masahiro, O'Connor Mary I., Olsen Jeanine L., Richardson J. Paul, Ruesink Jennifer L., Sotka Erik E., Thormar Jonas, Whalen Matthew A. et Stachowicz John J.. (2015). Biodiversity mediates top-down control in eelgrass ecosystems : a global comparative-experimental approach. Ecology Letters, 18, (7), p. 696-705.

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URL officielle: http://dx.doi.org/doi:10.1111/ele.12448

Résumé

Nutrient 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.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1461023X
Volume:18
Numéro:7
Pages:p. 696-705
Version évaluée par les pairs:Oui
Date:Juillet 2015
Identifiant unique:10.1111/ele.12448
Sujets:Sciences naturelles et génie > Sciences appliquées > Océanographie
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:biodiversity-ecosystem functioning, bottom-up control, coordinated experiments, food webs, metabolic ecology, structural equation modeling, top-down control
Informations complémentaires:This is the peer reviewed version of the following article: Duffy JE, Reynolds PL, Bostrom C, Coyer JA, Cusson M, Donadi S, Douglass JG, Eklof JS, Engelen AH, Eriksson BK, Fredriksen S, Gamfeldt L, Gustafsson C, Hoarau G, Hori M, Hovel K, Iken K, Lefcheck JS, Moksnes PO, Nakaoka M, O'Connor MI, Olsen JL, Richardson JP, Ruesink JL, Sotka EE, Thormar J, Whalen MA et Stachowicz JJ. 2015. Biodiversity mediates top-down control in eelgrass ecosystems: a global comparative-experimental approach. Ecology Letters, 18 : 696-705, which has been published in final form at DOI:10.1111/ele.12448. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Déposé le:23 mars 2016 00:20
Dernière modification:05 déc. 2016 20:30
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