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Appendix G. Average values ± 95% CI of independent variables for the six clusters of Fig. 6.

   Notes: P values of one-way ANOVAs derive from the F statistic. According to Wilk’s Lambda the P value for the MANOVA was < 0.0001. N represents the number of observations in each cluster.

The most distinct cluster (#5, Fig. 6) included the high productivity stations around Lac des Allemands in Barataria Basin and Grand Lake in Breton Sound. Separation was mainly due to low PO¹⁵N values and high POC and PON concentrations. Cluster 1, which incorporated several marine stations of both estuaries, the Mississippi River and the two stations closest to the diversion had high PO¹³C values and low POC and PON concentrations, but the separation from other clusters was strongest due to high PO¹⁵N values. The stations along the northern transect in Breton Sound (cluster 6) were characterized by even higher PO¹⁵N values than cluster 1, which corresponds to the strongest impact of Mississippi River water in this watershed. The remaining clusters 2, 3, and 4 generally reflect a salinity and productivity gradient. PO¹³C values decreased with distance from the marine end (salinity), the station around Lake Salvador had the lowest POC and PON concentrations combined with high C:N ratios, and PO¹⁵N values remained relatively constant.