7, 351 and 180%, respectively Corallina spp and Lithophyllum

7, 35.1 and 18.0%, respectively. Corallina spp. and Lithophyllum incrustans were present in all algal assemblages. Contrasting with results from November, the presence of S. muticum affected all biological responses of macroalgal assemblages measured. Although no significant relationship was observed between both response functions measured and species richness, invaded macroalgal assemblages were characterized by higher values (F1,53 = 6.66, P = 0.01, R2 = 0.11, for respiration and alpha, respectively; Fig. 2, a and b). In addition, interactive effects of S. muticum were observed on respiration when species evenness was considered (F3,51 = 5.88, P = 0.002,

R2 = 0.26; Fig. 2c). Specifically, native assemblages were characterized by a negative relationship between

assemblage respiration and evenness (F1,40 = 4.39, P = 0.04, R2 = 0.10), while in invaded assemblages selleck chemicals llc the slope of the relationship did not differ from 0 (Fig. 2c; see also Table S2 in the Supporting Information). Patterns were, however, quite different when the efficiency of the assemblages was considered. When respiration and light-use efficiency response function were normalized by the biomass of the assemblage, the effect of invasion by S. muticum was lost (see Table S3 in the Supporting Information). However, a significant positive effect of biodiversity (both species richness and evenness) was still OSI-906 ic50 evident in light-use efficiency (F1,53 = 5.46, P = 0.02, R2 = 0.09, and F1,53 = 18.17, P < 0.0001, R2 = 0.25, for species richness and evenness, respectively; Fig. 3, a and b). The triangular scatter of observations (Fig. 3a), suggested that variation among replicates of identical species richness decreased as species richness increased. Predictability–diversity relationships for light-use efficiency of macroalgal assemblages varied between native and invaded assemblages (Fig. 4). We observed that in native macroalgal assemblages, the CV significantly decreased with species richness (F1,4 = 12.24, P = 0.025,

R2 = 0.75). Thus, the variation among replicates of identical species richness declined as species richness increased. Contrasting results were obtained for invaded macroalgal assemblages where no relationship was found (F1,2 = 7.97, P = 0.10, selleck R2 = 0.79). The light compensation point did not differ between autumn and spring (47.07 and 48.81 μmol photons · m−2 · s−1, respectively). Moreover, the light compensation point of macroalgal assemblages was not affected by the presence of S. muticum (November: F3,33 = 0.11, P = 0.95, R2 = 0.01, and F3,33 = 1.22, P = 0.32, R2 = 0.10, using species richness and evenness, respectively; May: F3,51 = 2.11, P = 0.11, R2 = 0.11, and F3,51 = 1.74, P = 0.17, R2 = 0.09, using species richness and evenness, respectively). This study investigated how increased diversity due to the establishment of NIS affected ecosystem functioning responses in the recipient communities.

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