Table 1.

Linear regressions (model II) between DOC and FDOM indices (y-variable) and apparent oxygen utilization (x-variable) obtained from bulk DOM and apparent HMW (aHMW) and LMW (aLMW) fractions from samples collected at the salinity maximum (LIW). n = 9, m = slope, b = intercept, SE = Standard error and NS = Non significant. *, **, *** correspond with p < 0.05, p < 0.01 and p < 0.001, respectively. DOM <0.7 µm, aHMW <0.7 µm and >1 kDa and aLMW <1 kDa.

Fraction	y-variable	m ± SE	b ± SE	R2
DOM	DOC	−21 ± 2 × 10−2***	63 ± 1***	0.93
aHMW	DOC	−23 ± 4 × 10−2***	45 ± 2***	0.84
aLMW	DOC	7 ± 5 × 10−2NS	19 ± 1***	0.15
DOM	Peak C	35 ± 4 × 10−4***	0.43 ± 0.02***	0.92
aHMW	Peak C	18 ± 3 × 10−4***	0.20 ± 0.02***	0.83
aLMW	Peak C	21 ± 3 × 10−4***	0.23 ± 0.02***	0.84
DOM	Peak C*	9 ± 1 × 10−3***	0.50 ± 0.04***	0.96
aHMW	Peak C *	87 ± 5 × 10−4***	0.31 ± 0.03***	0.97
aLMW	Peak C*	6 ± 1 × 10−3***	1.00 ± 0.05***	0.87
DOM	Peak T	−10 ± 4 × 10−3*	2.4 ± 0.1***	0.58
aHMW	Peak T	−6 ± 1 × 10−3*	1.1 ± 0.1***	0.63
aLMW	Peak T	−4 ± 1 × 10−3***	1.29 ± 0.04***	0.83
DOM	Peak T*	0.01 ± 0.6NS	3.2 ± 0.3***	0.00
aHMW	Peak T *	7 ± 20 × 10−3 NS	2.1 ± 0.1***	0.02
aLMW	Peak T*	−28 ± 7 × 10−3**	5.7 ± 0.3***	0.73