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Temporal stability of European rocky shore assemblages : variation across a latitudinal gradient and the role of habitat-formers

Bulleri Fabio, Benedetti-Cecchi Lisandro, Cusson Mathieu, Maggi E., Arenas Francisco, Aspden Rebbecca, Bertocci I., Crowe Tasman P., Davoult Dominique, Eriksson Britas Klemens, Fraschetti Simonetta, Golléty Claire, Griffin John N., Jenkins Stuart R., Kotta Jonne, Kraufvelin Patrik, Molis Markus, Pinto Isabel Sousa, Terlizzi Antonio, Valdivia Nelson et Paterson David M.. (2012). Temporal stability of European rocky shore assemblages : variation across a latitudinal gradient and the role of habitat-formers. Oikos, 121, (11), p. 1801-1809.

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URL officielle: http://dx.doi.org/doi:10.1111/j.1600-0706.2011.199...

Résumé

Compensatory dynamics, overyielding and statistical averaging are mechanisms promoting the temporal stability of natural communities. Using the model of European intertidal rocky shore assemblages and collating 17 datasets, we investigated how the strength of these stability-enhancing mechanisms varies with latitude and how it can be altered by the loss of habitat-formers (e.g. canopy-forming macroalgae). Community stability decreased with increasing latitude, mostly as a consequence of a greater synchronization of species fluctuations. Statistical averaging and overyielding (i.e. richness effect) promoted stability, but their strength did not vary with latitude. An experimental removal of macroalgal canopies caused a strengthening of the statistical averaging effect that was consistent across the latitudinal gradient investigated. Nonetheless, the loss of canopies depressed stability by enhancing the synchronization of species fluctuations on southernmost shores, while it had weak effects on shores at higher latitudes. Variation in life-history traits among canopy-forming species and/or in prevailing environmental conditions across a gradient of latitude could underlie variable effects of habitat-formers on species fluctuations. Our study shows 1) that the stability of intertidal assemblages and strength of compensatory dynamics varies with latitude, 2) that canopy-forming macroalgae, exerting a strong control on understorey species, can influence the strength of compensatory dynamics and 3) that biological forcing (i.e. facilitation) can be as important as environmental forcing in enhancing the synchronization of species fluctuations.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0030-1299
Volume:121
Numéro:11
Pages:p. 1801-1809
Version évaluée par les pairs:Oui
Date:2012
Sujets:Sciences naturelles et génie > Sciences appliquées > Eau et environnement
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:compensatory dynamics, latitude, species richness, competitive communities, ecosystem productivity, biodiversity, intertidal assemblages, canopy-forming macroalgae, facilitation, species fluctuations
Déposé le:08 juin 2016 15:26
Dernière modification:05 déc. 2016 20:34
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