Figure 4
Sediment organic matter fractions. Sediment organic matter fractions (g kg−1) at Suquía River study sites during (A) low- and (B) high-flow periods. Asterisk indicates significant differences between flow periods for each study site (LSD test p > 0.05). RS, reference site; S1, site 1; S2, site 2; S3, site 3; S4, site 4; and S5, site 5. FA, fulvic acids; HA, humic acids; NHS, non-humic substances. Bars indicate SE.