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Table 4 Principal component analysis of the treatments with water quality parameters

From: Influence of probiotics on water quality in intensified Litopenaeus vannamei ponds under minimum-water exchange

Treatments Control (non-treated ponds) Single spp. probiotic Multi spp. probiotic
Component 1 2 3 1 2 3 1 2 3
Probiotic effect     − 0.912 − 0.004 0.163 0.949 0.058 − 0.091
Total Vibrio log (CFU mL−1) − 0.054 0.778 0.149 0.727 0.321 0.112 − 0.755 0.316 0.04
Temperature (ºC) 0.044 0.179 0.872 0.148 − 0.036 0.911 − 0.016 0.041 − 0.836
Dissolved oxygen (mg L−1) 0.941 0.082 − 0.033 − 0.681 − 0.298 0.065 0.842 − 0.123 0.143
pH − 0.145 0.874 − 0.078 0.448 0.704 − 0.058 − 0.242 0.828 0.056
Salinity (g L−1) 0.663 − 0.635 0.142 0.014 − 0.954 0.038 0.023 − 0.922 − 0.021
Organic matter (mg L−1) 0.104 0.13 − 0.852 0.493 0.004 − 0.718 0.021 0.086 0.866
NH3 (mg L−1) − 0.813 0.386 0.117 0.541 0.678 0.056 − 0.663 0.575 − 0.107
Initial Eigenvalues 2.024 1.976 1.55 2.582 2.059 1.395 2.68 1.993 1.494
% of variance 28.921 28.234 22.141 32.279 25.736 17.441 33.497 24.918 18.677
Cumulative % 28.921 57.155 79.296 32.279 58.016 75.457 33.497 58.415 77.092