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Large-scale variation in combined impacts of canopy loss and disturbance on community structure and ecosystem functioning

Crowe Tasman P., Cusson Mathieu, Bulleri Fabio, Davoult Dominique, Arenas Francisco, Aspden Rebecca, Benedetti-Cecchi Lisandro, Bevilacqua Stanislao, Davidson Irvine, Defew Emma, Fraschetti Simonetta, Golléty Claire, Griffin John N., Herkül Kristjan, Kotta Jonne, Migné Aline, Molis Markus, Nicol Sophie K., Noël Laure M-L J., Pinto Isabel Sousa, Valdivia Nelson, Vaselli Stefano et Jenkins Stuart R.. (2013). Large-scale variation in combined impacts of canopy loss and disturbance on community structure and ecosystem functioning. PLoS ONE, 8, (6), e66238.

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URL officielle: http://dx.doi.org/10.1371/journal.pone.0066238

Résumé

Ecosystems are under pressure from multiple human disturbances whose impact may vary depending on environmental context. We experimentally evaluated variation in the separate and combined effects of the loss of a key functional group (canopy algae) and physical disturbance on rocky shore ecosystems at nine locations across Europe. Multivariate community structure was initially affected (during the first three to six months) at six locations but after 18 months, effects were apparent at only three. Loss of canopy caused increases in cover of non-canopy algae in the three locations in southern Europe and decreases in some northern locations. Measures of ecosystem functioning (community respiration, gross primary productivity, net primary productivity) were affected by loss of canopy at five of the six locations for which data were available. Short-term effects on community respiration were widespread, but effects were rare after 18 months. Functional changes corresponded with changes in community structure and/or species richness at most locations and times sampled, but no single aspect of biodiversity was an effective predictor of longer-term functional changes. Most ecosystems studied were able to compensate in functional terms for impacts caused by indiscriminate physical disturbance. The only consistent effect of disturbance was to increase cover of non-canopy species. Loss of canopy algae temporarily reduced community resistance to disturbance at only two locations and at two locations actually increased resistance. Resistance to disturbance-induced changes in gross primary productivity was reduced by loss of canopy algae at four locations. Location-specific variation in the effects of the same stressors argues for flexible frameworks for the management of marine environments. These results also highlight the need to analyse how species loss and other stressors combine and interact in different environmental contexts.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1932-6203
Volume:8
Numéro:6
Pages:e66238
Version évaluée par les pairs:Oui
Date:2013
Identifiant unique:10.1371/journal.pone.0066238
Sujets:Sciences naturelles et génie > Sciences appliquées > Eau et environnement
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:algae, biodiversity, population dynamics, disturbance, community resistance, community structure, species richness
Déposé le:10 mars 2016 23:58
Dernière modification:05 déc. 2016 20:54
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Creative Commons LicenseSauf indication contraire, les documents archivés dans Constellation sont rendus disponibles selon les termes de la licence Creative Commons "Paternité, pas d'utilisation commerciale, pas de modification" 2.5 Canada.

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