Open Access

Fig. 4


Download original image

Graphical representation of the two primary axes (Axis 2, ordinate; Axis 1, abscissa) of the principal-components analysis (PCA) demonstrating the ordination of the sampling sites with respect to the environmental variables. Key to abbreviations: S1, Site 1; S2, Site 2; S3, Site 3; B, benthos; E, Egeria densa; L, Ludwigia peploides; M, Senecio bonariensis; H, Hydrocotyle bonariensis; A, Alternanthera philoxeroides; T, Typha latifolia; and F, Mougeotia; 1014, October 2014; 0515, May 2015; 0815, August 2015. Physicochemical parameters: conductivity, Cond; turbidity, Turb; nitrates, NO3; nitrites, NO2; ammonium, NH4+; phosphates, PO4−3; dissolved-oxygen concentration, DO; chemical-oxygen demand, COD; biochemical-oxygen demand, BOD; and organic matter in the sediments, OM. The areas demarcated by the broken red lines indicate the same sampling site.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.