highly significantp < 0.001
These revealed highly significant effects of treatment on C org density for each of the species: F (1, 180) = 38.68, p < 0.001 for T . hemprichii ; F (1, 180) = 27.89, p < 0.001 for T . ciliatum ; F (1, 180) = 32.16; p < 0.001 for E . acoroides and F (1, 180) = 11.55, p = 0.003 for S . isoetifolium .