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 1. Number of lakes examined for Gammarus lacustris in the 27 catchments (no 1–20) studied on Hardangervidda (6569 km 2) of which 20 and 80% are in the western (W) or central/eastern (C/E) region, respectively. The mean winter and summer precipitation (mm) and winter and summer temperatures (°C), are given for the normal period 1961-1990 computed by the NEVINA procedure (NVE Atlas, nve.no). Of the 245 lakes properly examined for Gammarus lacustris, 65% produced positive records. Many of the lakes are repeatedly investigated given with a factor in the last column (RE = number of examinations/number of examined lakes).

No.	Catchment	Region	Catchment km 2	Lake area km 2	Winter precipitation (mm)	Summer precipitation (mm)	Winter temp. ° C)	Summer temp. (° C)	Total no. of lakes	No. of lakes exam.	% of lakes exam.	Lakes with positive records	% lakes with positive records	No. exam.	Repeat examinations (RE)
1	Austdøla	W	121	13	1 000	594	-4.2	4.3	22	10	45	0	0	16	1.60
2	Sima	W	121	4	832	504	-5.1	3.1	14	1	7	0	0	2	2.00
3A	Isdølo	C/E	55	2	725	434	-4.5	4.1	6	1	17	1	100	2	2.00
3B	Leiro	C/E	211	18	571	406	-6.1	3.7	22	8	36	1	13	12	1.50
3C	Svinto	C/E	35	0	497	356	-7.9	4.3	2	1	50	1	100	2	2.00
4	Bjoreio	C/E	150	9	527	356	-6.9	4.2	14	3	21	3	100	15	5.00
5	Veig	C/E	395	10	669	375	-5.9	4.4	37	20	54	12	60	37	1.85
6A	Erdalsvassdraget	C/E	63	1	809	387	-1.8	6.0	2	2	100	2	100	5	2.50
6B	Bjotveitelvi	W	16	1	944	447	-1.4	6.4	2	1	50	1	100	4	4.00
7A	Kinso	C/E	210	14	900	435	-4.0	4.5	31	15	48	7	47	35	2.33
7B	Vivippo	W	39	1	919	423	-1.6	5.7	4	3	75	0	0	5	1.67
8	Opo	W	63	4	984	460	-2.0	5.2	10	4	40	0	0	4	1.00
9A	Espeelvi	W	9	0	938	489	-2.7	5.1	1	1	100	0	0	1	1.00
9B	Vendo	W	29	4	1 013	518	-3.3	4.0	2	1	50	0	0	2	2.00
10	Tysso	W	381	44	1 062	590	-4.2	4.1	46	20	43	0	0	53	2.65
11	Austdølo/Ljoso	W	120	9	1 151	614	-3.2	4.5	13	3	23	0	0	3	1.00
12	Suldalsvassdraget	W	217	10	984	586	-5.3	3.9	7	1	14	0	0	2	2.00
13	Bora	W	171	18	742	442	-5.9	4.5	34	2	6	1	50	6	3.00
14	Songa	C/E	379	42	582	400	-5.8	4.8	44	11	25	6	55	25	2.27
15	Kvenna	C/E	828	61	571	390	-7.8	4.5	99	39	39	30	77	146	3.74
16	Møsvatn	C/E	525	104	434	380	-6.1	4.7	103	5	5	3	60	6	1.20
17	Mår/ Gøyst	C/E	732	102	304	339	-6.7	4.8	156	13	8	13	100	28	2.15
18A	Uvdalselvi	C/E	196	10	292	332	-6.6	5.1	39	5	13	5	100	10	2.00
18B	Ølmosåi	C/E	188	22	314	355	-6.8	4.8	37	5	14	4	80	11	2.20
19A	Lågen	C/E	1 179	134	511	344	-8.1	4.7	154	60	39	59	98	233	3.88
19B	Ufysja	C/E	61	3	322	323	-5.8	5.0	10	5	50	5	100	15	3.00
20	Ørteråni	C/E	76	16	404	339	-7.4	4.6	19	5	26	5	100	30	6.00
			6 569	656					930	245	26	159	65	710	2.90