Table 1. Range of environmental variables of lakes included in this study for the different regions: subpolar (49°04′–55°06′S), temperate (35°02′-39°08′S and 41°12′–52°36′N), subtropical (29°09′–34°09′S), and tropical (5°04′–23°05′S).

Latitude	Number of lakes	T (°C)	Ice cover	Zmix (m)	Kd (m−1)	Cond (µS cm −1)	TNµg L −1)	TPµg L −1)	TZ (org L−1)	Chl-a (µeq L −1)
Subpolar*		13.4	yes	1.6	1.5	326	2106	438	2076	20.1
S	11	10.0–18.6		0.52–3.0	0.04–6.8	38–982	52–22993	15–9141	129–13855	<0.3–204
Temperate
S	11	16.0	yes	1.4	1.0	671	1515	144	6151	31.9
N	107	0.4–33.0		0.13–7.0	0.01–4.0	53–4930	63–25913	<10–5600	105–26319	0.3–595
Subtropical		19.6	no	1.9	0.8	315	4286	388	1106	76.7
S	40	10.0–30.1		1.1–4.5	0.2–3.9	53–2095	68–37928	29–10087	3–13474	<0.3–284
Tropical		25.0	no	2.2	1.2	315	474	85.6	347	12.2
S	42	14.3–33.0		0.60–4.5	0.2–4.5	19–2100	35–1950	<10–394	12–2252	<0.3–178

Abbreviations as in Table 2. S: southern, and N: northern hemispheres.

*Sampling in subpolar lakes only included summer season.