Table 1. Changes in median iron and organic matter concentrations in the rivers since the beginning of monitoring until 2012.

Sampling site		Iron			Organic matter
		1972–1976	2008–2012	Increase	1972–1976	2008–2012	Increase
		(µmol L−1)	(µmol L−1)	(µmol L−1) (%)	(mmol O2 L−1)	(mmol O2 L−1)	(mmol O2 L−1) (%)
Emån	57°08′28′′N, 16°27′09′′E	7 (6–9)	14 (11–16)	7 (99)	0.43 (0.37–0.53)	0.48 (0.42–0.57)	0.06 (13)
Ljungbyån	56°37′53′′N, 16°10′21′′E	3 (1–5)	18 (14–23)	15 (523)	0.24 (0.19–0.35)	0.51 (0.41–0.64)	0.27 (113)
Lyckebyån	56°11′55′′N, 15°39′47′′E	12 (7–17)	32 (28–38)	20 (175)	0.28 (0.24–0.33)	0.66 (0.55–0.80)	0.37 (131)
Mörrumsån	56°11′21′′N, 14°45′00′′E	2 (1–3)	10 (8–12)	8 (444)	0.27 (0.25–0.30)	0.47 (0.43–0.55)	0.21 (76)
Helgeån	55°56′36′′N, 14°13′09′′E	9 (5–15)	34 (29–45)	25 (284)	0.30 (0.25–0.35)	0.66 (0.58–0.74)	0.36 (118)
Lagan	56°30′56′′N, 13°03′05′′E	7 (6–7)	18 (15–21)	11 (170)	0.31 (0.27–0.35)	0.51 (0.48–0.58)	0.20 (65)
Nissan	56°41′29′′N, 12°52′25′′E	10 (8–11)	21 (17–27)	12 (120)	0.36 (0.32–0.43)	0.58 (0.48–0.72)	0.22 (61)

The first and third quartiles are given within brackets.