Liège 2008 Multi-scale spatial variability of amphipod assemblages from the foliar stratum of the Posidonia oceanica (L.) Delile meadow Nicolas Sturaro.

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Liège 2008 Multi-scale spatial variability of amphipod assemblages from the foliar stratum of the Posidonia oceanica (L.) Delile meadow Nicolas Sturaro 1, Gilles Lepoint 1, Loïc Michel 2, Sylvie Gobert 1 1 Laboratoire d’Océanologie, University of Liège, Liège, Belgium 2 Laboratoire de Systématique et Diversité Animale, University of Liège, Liège, Belgium

Context of the Study Ecological communities are patchy Several spatial and temporal scales Studying spatial patterns is of ecological importance  understand the causes of the distribution and abundance of organisms  provide valuable basis for management and conservation

Posidonia oceanica - endemic species of seagrass - forms large meadows - important habitat for mobile invertebrates Egidio Trainito Context of the Study Amphipods - large number of species - considerable abundance/biomass - important trophic ressource Peter Bryant

Amphipods Vertical spatial variability of amphipods is better known in P. oceanica meadows Horizontal spatial variability ? At different spatial scales ?

Objective Assess the spatial variability, at different scales, of amphipods living in the P. oceanica meadows Explore the relationship between the amphipod assemblages and habitat structure

Study site : Revellata Bay (NW of Corsica) Material & Methods

 Hierarchical spatial sampling design Material & Methods S1 S2 F1F2 Sites (~ 100 m) Frames (~ 10 m) Samples (~ 1 m) XXXXXX XXXXXX XXXXXX XXXXXX Z1 Zone Constant depth: m 10 m F1 F2 F3 F4 F3F4

Material & Methods Air-Lift - non destructive method - quantitative estimation - capture samples at small spatial scale ~ 1 m flexible suction tube collecting nylon bag PVC suction tube pressure regulator compressed air injector 100 cm

Sampling area of the meadow is previously delimited by a PVC cylinder (0,129 m 2 ) Aspiration of the leaves included in the cylinder, with the vagile fauna (2 min) Sampling was realized between 10h30 am and 3h00 pm (March 2007) Egidio Trainito Material & Methods

Results and Discussion

Community Structure General Characteristics - Abundance : 727 amphipods - Sample richness : 30 species - Variable diversity : low to medium (H´: 0,45 - 1,88) - Dominant species : Apherusa chiereghinii (46,1 %) Aora spinicornis (18,4 %) Amphilochus neapolitanus (5,3%) 1 mm

Variations at different spatial scales Abundance (number of individuals per sample) Distance (~ m) *

Variations at different spatial scales Biomass (in mg AFDW per m 2 of the meadow) Distance (~ m)  High heterogeneity of the meadow *

Variations at different spatial scales Density of the meadow (number of shoots per m 2 ) Distance (~ m)  High heterogeneity of the meadow

Variations at different spatial scales Species richness (number of species) Distance (~ m) *

Variations at different spatial scales Diversity (Shannon-Wiener index, H´) Distance (~ m) *  Habitat complexity…lower density of the meadow and litter accumulations

Stress : 0,13 Frame 1 Frame 2 Non-metric Multidimensional scaling Frame 3 Frame 4

Summary Scales ~ 1 m~ 10 m~ 100 m Abundance Biomass Species richness Diversity Specific composition No clear pattern Influence No Influence

Conclusions Our results showed Amphipod community associated with the P.oceanica meadow : abundant, rich in species, moderately diversify Community dominated by a few species Important spatial variability at different scales

Conclusions Our results showed Some scales influenced the characteristics of the community more than others - Small spatial scale >> abundance and biomass - Medium scale >> species richness and diversity

Thank you for your attention Egidio Trainito, AMP Tavolara-Punta Coda Cavallo

Acknowledgments We are very thankful to the staff of the oceanographic station STARESO (CORSICA) for their hospitality and assistance during field work. This study was supported by F.R.I.A. (Fonds pour la formation à la Recherche dans l’industrie et dans l’agriculture) FRIA Grant – FC Contact :