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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Changes in the shape of zooplankton biomass-size spectra at ecological scaling in a fluctuating ecosystem (Emporda Wetlands, Ne Spain) (2005)
Auteurs :	S. Brucet, Auteur ; X. D. Quintana, Auteur ; R. Moreno-Amich, Auteur ; D. Boix, Auteur
Type de document :	Article
Dans :	Vie et Milieu - Life and Environment (55(1) mars 2005)
Article en page(s) :	31-40
Langues:	Anglais
Résumé :	The biomass-size spectrum, at ecological scaling of zooplankton community in a fluctuating basin of Emporda Wetlands was analysed by adjustment to a model based on the Pareto distribution. Different shapes of spectra have been related to the availability of resources. Under flooding conditions biomass-size spectra fit better a linear model (Pareto Type 1), whereas in confinement conditions curved shape biomass-size spectra (Pareto Type 11) were more frequent. Results suggest that under flooding conditions competitive and predatory interactions are low and size distributions reflect mainly population growth, especially of small-size organisms. The result is a linear spectrum. On the other hand, during confinement conditions interactions between species would acquire more relevance due to the lack of resources, favouring the displacement of biomass toward larger sizes. The result is a curved spectrum and a decrease of diversity. Thereby, the shape of the biomass-size spectrum is an indicator of the degree of ecological interactions within the zooplankton functional group.
En ligne :	https://wwwphp.obs-banyuls.fr/Viemilieu/index.php/volume-55-2005/55-issue-1.html

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