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Influence of topographic heterogeneity and spatial scales on the structure of the neighbouring intertidal endobenthic macrofaunal community

Cusson Mathieu et Bourget Edwin. (1997). Influence of topographic heterogeneity and spatial scales on the structure of the neighbouring intertidal endobenthic macrofaunal community. Marine Ecology Progress Series, 150, p. 181-193.

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URL officielle: http://dx.doi.org/10.3354/meps150181

Résumé

The influence of topographic heterogeneity (boulders of different sizes: 0.75, 1.5, 2.25 m) on intertidal soft-bottom community characteristics [diversity(H') richness, and biomass] was examined in the St. Lawrence Estuary, Canada. The macrofauna, sediment characteristics, and flow regime in the zones surrounding boulders were examined in 6 orientations (directions) and at 3 distances from boulders. Flow around boulders and control sites (no boulders) was estimated by the rate of plaster dissolution of standard plaster cylinders. Control sites (no boulders) showed the highest species diversity (H'a: based on density) and richness. These parameters decreased significantly with boulder size and increased significantly with distance from boulders. For both small and large boulder sizes, highest and lowest diversities were generally observed in opposite orientations. Overall, biomass was not influenced by boulder size. Plaster dissolution explained more variability in diversity, richness and biomass (up to 35, 30 and 25%, respectively) than did sediment characteristics (8, 6 and 27%, respectively). Species dominance was strong and probably explained the relative constancy of diversity among treatments.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:0171-8630
Volume:150
Pages:p. 181-193
Version évaluée par les pairs:Oui
Date:1997
Identifiant unique:10.3354/meps150181
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:Topographical heterogeneity, scale heterogeneity, species richness, diversity, soft bottom, macrofauna, intertidal community, biomass, flow rate, sediment
Déposé le:11 mars 2016 01:30
Dernière modification:05 déc. 2016 20:54
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