The small eukaryotic community structures of all other treatments (without selleck screening library temperature increase) had closer similarity to initial conditions. Overall, CE-SSCP profiles generated

from all experimental bags showed good reproducibility within triplicate of each treatment (ANOSIM R < 0.2, p < 0.001), except for one replicate of the UVBR condition which had an atypical profile. MDS ordination plot stress value selleck inhibitor was low (0.1) which indicated good ordination without misleading interpretation [53]. The same trends were found with the UPGMA (Unweighted Pair Group Method using Arithmetic averages) analysis (data not shown). Figure 3 A. Comparison of diversity profiles obtained by CE-SSCP (based on Bray-Curtis Similarity). Replicates were analysed separately. B. UNIFRAC analysis comparing the composition (representation of OTUs) of the nine clone libraries (one library at T0 and eight at T96h). Treatment triplicates were pooled. Changes in small eukaryotes phylogenetic composition (sequencing) A total of 88 OTUs were identified (97% similarity) (Additional file 2: Table S1; and phylogenetic tree in Additional file 1: Figure S1). During the incubation, the richness detected by selleckchem molecular analyses showed a general decrease in 7 (out of the 8) treatments (Figure 4). TUV + Nut was the only treatment characterised Dipeptidyl peptidase by a clear increase in the richness

(SAce = 64), whereas the greatest decrease was recorded in the C + Nut treatment (SAce = 22). Even though no general trend was observed in the responses of small eukaryotes in terms of overall richness, the beta-diversity (phylogenetic composition) studied from UNIFRAC metrics revealed a clear association between all treatments with increased temperature (discrimination on axis 1). This highlights the significant structuring impact of increased temperature, while on axis 2,

nutrient addition appeared as the second-most important factor in shaping the eukaryotic composition (Figure 3B). These observations were confirmed by analyzing the correlations between coordinates on the PCA axis and environmental parameters: coordinates on axis 1 were indeed significantly correlated to temperature values (P = 0.006) while coordinates on axis 2 were significantly correlated to inorganic nutrients concentrations (P = 0.046 and P = 0.006, respectively for NO2 and NO3). The P-values matrix that compares each sample to each other sample showed significant differences in the phylogenetic composition of eukaryotes between T, T + Nut, TUV on the one hand and C + Nut on the other (Additional file 2: Table S2). Thus, CE-SSCP profiles and UNIFRAC analysis led to the same general pattern of changes in the small eukaryote structure. Figure 4 Composition of the nine 18SrRNA gene clone libraries.