Canonical correspondence analysis (CCA). Triplot graph of CCA showing ordination of species, samples and environmental variables from Zacarés rice fields in the first two axes. Blue triangles: species scores. Red circles: samples taken in May-June. Green squares: samples collected in July-September. Solid line arrow: significant (p < 0.05). Dashed line arrows: not significant (0.2 > p > 0.05). See text for further explanation.