Table 1.

Location, general features, and some limnological parameters of the 21 samples from Pyrenean high-altitude lakes (DOC, dissolved organic carbon; TP, total phosphorous; TN, total nitrogen).

Lake	Latitude	Longitude	Altitude (m asl)	Max. depth (m)	pH units	Conductivity (mS cm−1)	DOC (mg l−1)	TP (nM)	TN (μM)	Chl a (μg l−1)	Secchi depth (m)
*Aixeus	42°36′40″	1°22′18″	2370	15.5	4.97	49.9	0.2	74	18	0.6	15.5
*Bassa de les Granotes	42°34′24″	0°58′16″	2330	5	6.45	9.8	2.3	119	26	4.6	2.4
Botornàs	42°35′35″	0°40′52″	2340	22	7.23	24.1	0.3	168	26	2.0	12.4
Certascan	42°42′40″	1°18′12″	2335	113	5.67	9.1	0.2	78	35	0.2	19.6
Filià	42°27′4″	0°57′12″	2140	5.5	7.79	133.3	not available	94	21	1.7	1.3
Gerber	42°37′50″	0°59′41″	2170	63	7.13	23.4	0.6	88	9	1.3	11.8
Ibonet Perramó	42°38′34″	0°29′49″	2293	5	7.49	33.3	0.4	150	17	0.6	5.2
Illa	42°37′6″	0°59′37″	2452	18	6.68	13.3	0.4	70	7	1.3	12.0
Llauset	42°39′22″	0°41′11″	2190	90	7.52	58.7	not available	113	18	1.1	10.0
Llebreta	42°33′3″	0°53′25″	1620	11.5	7.55	30.6	1.1	203	not available	1.8	7.9
Long de Liat	42°48′24″	0°52′26″	2140	32	7.27	20.8	0.7	68	5	1.0	11.8
Muntanyó d′Àrreu	42°40′26″	1°00′29″	2210	29	9.18	74.3	0.8	674	9	12.0	10.1
Pica Palomèra	42°47′38″	0°52′8″	2308	10	4.61	29.6	not available	50	9	0.5	8.0
Plan	42°37′21″	0°55′51″	2188	11	7.04	16.7	1.4	63	7	0.6	9.0
Pòdo	42°36′11″	0°56′21″	2450	20	6.41	9.4	0.3	273	79	4.2	9.6
Pois	42°39′20″	0°42′27″	2056	19.5	8.19	67.2	0.2	82	14	2.9	8.6
*Redon	42°38′33″	0°46′13″	2240	73	6.67	10.5	0.4	n.a.	n.a.	1.5	n.a.
Roi	42°34′29″	0°48′12″	2310	10	7.06	25.8	0.5	126	18	5.2	5.9
Romedo de Dalt	42°42′22″	1°19′29″	2114	40	6.31	5.8	0.8	103	13	2.8	14.4

Chemical and Chla values measured at the depth of the deep chlorophyll maxima. (

^*Lakes discarded from the analysis, see text).