Redundancy analysis (RDA) of phyla (blue arrows) and target ARGs (red arrows) in shrimp intestinal tract samples. RDA1 and RDA2 explained 75.7% and 24.2% of the total variance, respectively. All taxa with abundance below 1% were grouped under others. Variables cmlA and sul1 were selected as RDA1 and RDA2, explaining 68% and 32% of the variance, respectively.