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(A) Correlation circle of the principal component analysis. Only explanatory variables (solid black arrows) and supplementary variables (dashed blue arrows) with cos2 ≥ 0.75 are shown. Arrows without names are supplementary variables with cos2 < 0.75. TP is total phosphorus concentration, tpp is total chlorophyll concentration, DO is dissolved oxygen, BMI is estimated benthic macro-invertebrate production, PI is fish production intensity, t. is water temperature, X. O2 is oxygen saturation, TN is total nitrogen concentration, bra is chlorophyll concentration from brown algae, and zooplankton is estimated zooplankton production. (B) Position of replicate fishponds 1 and 2 of each treatment in the biplot of the principal component analysis.
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