Table 2.
Average biological factors ±SD within Icelandic springs housing small benthic Arctic charr. Numbers show densities of invertebrates per m2 bottom.
| Location | No. of species | No. of individuals | Acarina | Cladocera | Coleoptera | Collembola |
|---|---|---|---|---|---|---|
| Álftavatn1 | 17.0 ± 7.40 | 551.2 ± 417.87 | 9.64 ± 11.79 | 68.7 ± 62.48 | 0.0 ± 0.00 | 1.3 ± 1.54 |
| Botnar 1 | 10.4 ± 3.05 | 712.5 ± 371.21 | 63.6 ± 58.37 | 3.3 ± 5.31 | 0.0 ± 0.00 | 0.8 ± 1.82 |
| Botnar 21 | 13.6 ± 6.73 | 556.5 ± 565.86 | 6.9 ± 11.91 | 25.4 ± 51.21 | 0.0 ± 0.00 | 1.5 ± 2.13 |
| Grafarlönd | 5.8 ± 4.15 | 354.9 ± 311.02 | 8.0 ± 12.01 | 0.0 ± 0.00 | 0.0 ± 0.00 | 0.0 ± 0.00 |
| Grímsnes | 16.0 ± 4.30 | 1427.3 ± 901.59 | 18.3 ± 40.14 | 1.6 ± 3.63 | 0.1 ± 0.27 | 1.1 ± 2.16 |
| Herdubreidarl. | 6.6 ± 3.91 | 791.4 ± 620.39 | 6.1 ± 9.57 | 0.0 ± 0.00 | 0.0 ± 0.00 | 0.0 ± 0.00 |
| Hlídarvatn1 | 11.6 ± 7.09 | 396.6 ± 308.44 | 7.5 ± 10.60 | 23.1 ± 42.31 | 0.0 ± 0.00 | 0.2 ± 0.47 |
| Hraun | 11.7 ± 1.53 | 2268.1 ± 1953.56 | 13.5 ± 12.39 | 66.6 ± 115.37 | 0.0 ± 0.00 | 2.5 ± 2.60 |
| Hrauná | 5.3 ± 3.21 | 299.9 ± 229.06 | 6.7 ± 7.73 | 0.0 ± 0.00 | 0.0 ± 0.00 | 0.3 ± 0.46 |
| Húsafell 1 | 5.4 ± 0.89 | 153.3 ± 114.09 | 1.6 ± 1.75 | 23.1 ± 33.04 | 0.0 ± 0.00 | 0.0 ± 0.00 |
| Húsafell 21 | 3.7 ± 2.31 | 101.7 ± 36.17 | 0.0 ± 0.00 | 0.0 ± 0.00 | 0.0 ± 0.00 | 0.0 ± 0.00 |
| Kaldárbotn | 6.6 ± 2.61 | 316.7 ± 89.75 | 0.0 ± 0.00 | 26.0 ± 37.39 | 0.4 ± 0.93 | 1.2 ± 1.79 |
| Keldur | 7.7 ± 2.31 | 6364.4 ± 7294.07 | 0.4 ± 0.74 | 0.0 ± 0.00 | 0.0 ± 0.00 | 0.7 ± 0.65 |
| Klapparós | 4.3 ± 4.93 | 33.0 ± 45.70 | 0.2 ± 0.42 | 0.0 ± 0.00 | 0.0 ± 0.00 | 0.0 ± 0.00 |
| Laekjarbotn. 1 | 12.4 ± 5.32 | 985.6 ± 422.80 | 28.0 ± 36.54 | 0.0 ± 0.00 | 0.0 ± 0.00 | 2.8 ± 4.01 |
| Laekjarbotn. 2 | 7.8 ± 1.71 | 226.1 ± 151.24 | 7.1 ± 11.74 | 0.0 ± 0.00 | 1.0 ± 2.03 | 0.0 ± 0.00 |
| Midhúsaskógur1 | 11.0 ± 4.04 | 446.2 ± 578.83 | 25.9 ± 63.05 | 36.4 ± 72.07 | 0.1 ± 0.28 | 0.7 ± 1.66 |
| Oddar | 5.0 ± 1.87 | 235.2 ± 106.52 | 1.1 ± 1.77 | 0.0 ± 0.00 | 0.0 ± 0.00 | 0.8 ± 1.75 |
| Presthólar | 8.8 ± 3.96 | 496.0 ± 431.08 | 8.7 ± 15.24 | 33.5 ± 56.21 | 0.0 ± 0.00 | 0.0 ± 0.00 |
| Sandur | 13.7 ± 3.21 | 914.8 ± 896.81 | 25.9 ± 12.39 | 0.6 ± 0.48 | 0.0 ± 0.00 | 0.0 ± 0.00 |
| Silungapollur1 | 12.6 ± 8.88 | 143.3 ± 96.74 | 1.0 ± 2.07 | 6.4 ± 3.80 | 0.0 ± 0.00 | 0.0 ± 0.00 |
| Sílatjörn1 | 9.4 ± 6.58 | 374.9 ± 278.19 | 13.0 ± 19.22 | 8.5 ± 10.11 | 0.0 ± 0.00 | 0.2 ± 0.35 |
| Skardslaekur | 13.7 ± 4.06 | 973.5 ± 711.66 | 11.5 ± 14.54 | 0.0 ± 0.00 | 0.5 ± 0.57 | 7.0 ± 18.16 |
| Straumsvík 21 | 13.6 ± 2.51 | 428.4 ± 204.78 | 80.0 ± 121.20 | 176.4 ± 90.17 | 0.0 ± 0.00 | 0.9 ± 1.36 |
| Thverá | 12.0 ± 3.46 | 1278.1 ± 1780.24 | 21.0 ± 35.14 | 18.2 ± 23.23 | 0.9 ± 1.48 | 0.0 ± 0.00 |
| Location | Copepoda | Oligochaeta | Ostracoda | Pupae | Chiranomidae | Trichoptera |
| Álftavatn1 | 46.8 ± 42.39 | 18.3 ± 15.94 | 16.1 ± 9.15 | 0.0 ± 0.00 | 383.0 ± 383.16 | 4.5 ± 4.85 |
| Botnar 1 | 25.2 ± 40.99 | 70.1 ± 41.37 | 187.1 ± 383.82 | 9.6 ± 20.31 | 337.5 ± 376.21 | 0.8 ± 1.04 |
| Botnar 21 | 90.0 ± 148.51 | 51.4 ± 51.33 | 24.9 ± 26.61 | 2.3 ± 2.17 | 332.7 ± 394.49 | 6.2 ± 9.46 |
| Grafarlönd | 7.4 ± 11.45 | 9.2 ± 11.80 | 6.4 ± 10.71 | 2.2 ± 2.89 | 321.6 ± 272.08 | 0.0 ± 0.00 |
| Grímsnes | 19.7 ± 18.72 | 60.9 ± 50.60 | 10.4 ± 10.72 | 3.9 ± 6.29 | 1267.8 ± 861.69 | 2.3 ± 3.58 |
| Herdubreidarl. | 81.3 ± 152.96 | 190.1 ± 382.12 | 40.2 ± 61.04 | 3.8 ± 4.03 | 469.9 ± 301.63 | 0.0 ± 0.00 |
| Hlídarvatn1 | 46.2 ± 76.00 | 75.1 ± 59.43 | 17.8 ± 25.14 | 5.8 ± 8.58 | 211.7 ± 205.38 | 7.1 ± 14.55 |
| Hraun | 26.7 ± 19.68 | 29.0 ± 9.40 | 21.3 ± 15.15 | 3.2 ± 5.58 | 2102.8 ± 1978.42 | 0.5 ± 0.88 |
| Hrauná | 4.5 ± 7.83 | 0.3 ± 0.46 | 0.5 ± 0.92 | 0.9 ± 0.99 | 284.6 ± 213.85 | 2.2 ± 0.67 |
| Húsafell 1 | 28.4 ± 27.75 | 14.6 ± 23.07 | 12.2 ± 11.50 | 0.6 ± 1.37 | 71.3 ± 114.41 | 1.1 ± 1.56 |
| Húsafell 21 | 14.2 ± 12.28 | 0.7 ± 1.21 | 0.0 ± 0.00 | 0.7 ± 1.24 | 83.2 ± 52.25 | 2.9 ± 3.29 |
| Kaldárbotn | 120.3 ± 110.44 | 47.5 ± 56.06 | 2.4 ± 2.18 | 1.2 ± 1.80 | 114.5 ± 45.33 | 1.6 ± 2.15 |
| Keldur | 13.4 ± 10.12 | 132.8 ± 227.61 | 0.0 ± 0.00 | 5.2 ± 4.26 | 6209.8 ± 7056.70 | 0.3 ± 1.32 |
| Klapparós | 12.8 ± 22.22 | 1.7 ± 2.94 | 5.7 ± 2.22 | 0.2 ± 0.42 | 11.8 ± 19.35 | 0.5 ± 0.84 |
| Laekjarbotn. 1 | 19.3 ± 16.99 | 128.7 ± 121.22 | 20.2 ± 13.87 | 9.9 ± 7.93 | 765.3 ± 411.92 | 5.6 ± 10.97 |
| Laekjarbotn. 2 | 1.0 ± 0.82 | 41.0 ± 52.23 | 20.2 ± 23.87 | 2.8 ± 3.60 | 151.8 ± 140.66 | 0.0 ± 0.00 |
| Midhúsaskógur1 | 36.4 ± 38.13 | 18.3 ± 11.29 | 8.9 ± 13.40 | 0.1 ± 0.27 | 284.4 ± 505.64 | 0.1 ± 0.26 |
| Oddar | 17.0 ± 34.32 | 11.4 ± 25.42 | 0.8 ± 1.82 | 3.8 ± 3.83 | 182.9 ± 134.73 | 16.38 ± 25.70 |
| Presthólar | 29.1 ± 38.61 | 16.6 ± 14.90 | 7.4 ± 12.09 | 8.6 ± 11.76 | 387.4 ± 441.92 | 3.8 ± 7.93 |
| Sandur | 10.3 ± 9.88 | 11.9 ± 8.45 | 2.2 ± 2.13 | 5.8 ± 1.32 | 846.6 ± 887.47 | 2.2 ± 2.48 |
| Silungapollur1 | 49.9 ± 44.62 | 10.4 ± 10.52 | 7.6 ± 7.21 | 1.8 ± 1.67 | 63.0 ± 47.17 | 1.4 ± 1.65 |
| Sílatjörn1 | 11.5 ± 17.23 | 3.6 ± 5.19 | 4.2 ± 4.60 | 1.2 ± 2.06 | 327.1 ± 233.93 | 4.0 ± 5.08 |
| Skardslaekur | 53.8 ± 33.25 | 5.4 ± 10.35 | 45.1 ± 49.01 | 6.0 ± 5.08 | 827.3 ± 633.62 | 5.5 ± 3.26 |
| Straumsvík 21 | 28.1 ± 26.77 | 10.0 ± 14.99 | 20.2 ± 28.49 | 0.5 ± 0.68 | 75.7 ± 69.77 | 0.6 ± 0.89 |
| Thverá | 27.3 ± 21.54 | 63.4 ± 107.31 | 23.2 ± 33.40 | 6.8 ± 0.69 | 1093.1 ± 1583.93 | 1.5 ± 1.44 |
1
Pond habitat.