The freshwater shrimp Gammarus lacustris (Malacostraca, Amphipoda) in lakes on the Hardangervidda mountain plateau, southern Norway: distribution and environmental requirements Author Qvenild, Tore County Governor of Innlandet, Statens hus, Parkgata 36, NO- 2317 Hamar, Norway Author Hesthagen, Trygve Norwegian Institute for Nature Research (NINA), PO box 5685, Torgarden, NO- 7485 Trondheim Author Fjellheim, Arne NORCE Norwegian Research Centre AS, Nygårdsgaten 112, NO- 5008 Bergen, Norway text Fauna norvegica 2020 2020-03-16 40 1 21 https://doi.org/10.5324/fn.v40i0.3101 journal article 10.5324/fn.v40i0.3101 1891-5396 16906926

Table 3. Water quality in terms of pH and calcium concentration in 219 lakes on Hardangervidda with 191 and 28 lakes in the central/eastern (C/E) and western (W) areas, respectively. For the central/eastern area, the water quality is given for lakes with and without records of Gammarus lacustris, respectivelly.

Region		No. lakes	pH range	No. of lakes pH<6.0	Ca mean ±SD mg L-1	Ca range mg L-1	No. of lakes with Ca <1.0 mg L-1
C/E	All lakes	191	5.19-7.28	20 (10%)	1.63±1.14	0.28-5.73	70 (37%)
C/E	Lakes with G. lacustris	89	5.49-7.26	8 (9%)	1.84±1.18	0.28-5.54	25 (28%)
C/E	Lakes without G. lacustris	102	5.19-7.28	12 (12%)	1.45±1.08	0.37-5.73	45 (44%)
W	All lakes	28	5.35-7.00	6 (21%)	0.76±0.39	0.32-1.68	22 (79%)
W and C/E	All lakes	219	5.19-7.28	26 (12%)	1.52±1.11	0.28-5.73	92 (42%)