Table I.

Latitude, longitude, altitude, maximum depth (Z_max) at sampling period, diffuse attenuation coefficient at 320 nm (K_d320), dissolved organic carbon (DOC), conductivity (Cond.), and chlorophyll a (Chl a) concentrations in the studied lakes, and zooplankton species present in each lake

Lake	Latitude (S)	Longitude (W)	Altitude m (a.s.l.)	Zmax (m)	Kd320 (m−1)	DOC (g m−3)	Cond. (μS cm−1)	Chl a (mg m−3)	Species
Lake Schmoll	41°12′	71°29′	1950	5	0.14a	0.38b	6.3	0.14	B. gibbosa
Pond	41°12′	71°29′	1750	~0.3	1.80	na	23.2	13.39	B. gibbosa
Lake Toncek	41°12′	71°29′	1700	12	0.61a	0.49b	12.3	0.55	B. gibbosa
Lake Tempanos	41°12′	71°34′	1650	8	1.27	na	27.1	0.32	B. gibbosa
Lake Jakob	41°12′	71°34′	1550	25	0.26	na	13.8	0.26	B. gibbosa
Lake Verde	41°14′	71°22′	1545	5	2.22a	1.23b	29.0	9.72	B. gracilipes
Lake Negra	41°08′	71°34′	1100	10	na	na	5.8	0.12	B. gibbosa
Lake Trébol	41°03′	71°31′	764	12	3.08	1.70b	67.5e	1.34	B. gracilipes
Nahuel Huapi	41°06′	71°18′	764	464	0.42a	0.41b	30.9e	0.58	S. amethystinus
Alicura (Upstream)	40°43′	71°05′	705	25	0.64c	na	31.2–42.0d	0.60–0.67	B. gracilipes
Alicura (Dam)	40°40′	71°00′	705	80	0.64c	na	33.8–35.8d	0.62–1.09	B. gracilipes
Lake Puesto	40°20′	70°30′	590	~1	131.5	na	na	25.07	P. sarsi, B. meteoris
Lake Toro	40°20′	70°30′	590	~1	75.6	521c	3950–8800	1.98	P. sarsi, D. middendorffiana
Lake Flamingo	40°20′	70°30′	590	~1	166.2	147c	na	19.07	P. sarsi

^aData on UV attenuation are from Morris et al. (Morris et al., 1995) measured with a PUV 500 radiometer corresponding well with the predicted values by optical colour measurements. Data on UV attenuation for Lake Trébol and Alicura reservoir are from D. Morris and C. Osburn measured with a PUV 500 radiometer (unpublished data). na, data not available.

^bData are from Morris et al. (Morris et al., 1995).

^cData are from D. P. Morris (unpublished).

^dData are from Temporetti (Temporetti, 1998).

^eData are from Pedrozo et al. (Pedrozo et al., 1993).