Fig. 4: Ecological factors driving nitrogen cycling variations.
From: Marine toxin domoic acid alters nitrogen cycling in sediments
a Pairwise comparisons of DA (domoic acid), environmental variables and nitrogen cycling (genes, metabolites). The color gradient in the heatmap denotes Spearman’s correlation coefficients and the asterisk indicates two-tailed test of Spearman’s statistical significance adjusted. Edge width corresponds to the Mantel’s r statistic for the corresponding distance correlations, and edge color denotes the statistical significance; b Path diagram for PLS-PM (partial least squares path modeling) only showing significant effects of variables on nitrogen cycling. Numbers adjacent to the arrows are standardized path coefficients (r), analogous to relative regression weights and indicative of the effect size of the relationship. R2 represents the proportion of variance explained for every dependent variable (in the box) in the model. Blue and red arrows represent significant (p < 0.05) negative and positive pathways, respectively. TOC total organic carbon, TON total organic nitrogen, AOM algal organic matter. Nitrogen cycling: ammoniation, nitrification, denitrification, Anammox, N2 fixation, DNRA (dissimilatory nitrate reduction to ammonium).
