TABLE 1.
Sample environmental data.
| Sample | Ice (cm) | DOC (mg L–1) | TN (μg L–1) | TP (μg L–1) | Temp. (°C) | Cond (μ S cm–1) | Chl a (μg L–1) | DL (h) | Size | Group |
| GRL_23AP18 | 155 | 5.6 | 600 | 11 | 1.86 | 608 | 0.39 | 17.23 | L | Ice1 |
| L05_24AP18 | 170 | 3.8 | 381 | 8.3 | 0.79 | 382 | 0.27 | 17.39 | M | Ice1 |
| 1ST_26AP18 | 180 | 5.2 | 511 | 13.1 | 0.71 | 496 | 4.20 | 17.71 | M | Ice1 |
| 2ND_26AP18 | 175 | 5.1 | 537 | 15.5 | 0.54 | 440 | 2.46 | 17.71 | M | Ice1 |
| GRL_10JN15 | 205 | 5.7 | nd | 6.1 | 1.80 | 675 | 1.07 | 24.00 | L | Ice1 |
| GRL_15JN15 | 195 | 4.9 | nd | 7.5 | nd | nd | 0.86 | 24.00 | L | Ice1 |
| GRL_12JN15 | 200 | nd | nd | nd | nd | nd | Nd | 24.00 | L | Ice1 |
| ERA4_24AP18 | 167 | 8.7 | 736 | 8.5 | 1.14 | 878 | 0.10 | 17.39 | S | Ice2 |
| L05_02NO17 | 40 | 3.7 | 333 | nd | 0.56 | 318 | 0.54 | 6.50 | M | Ice2 |
| ERA4_03NO17 | 44 | 6.6 | 661 | 8.4 | nd | nd | 0.84 | 6.35 | S | Ice2 |
| 2ND_01NO17 | 36 | 4.4 | 456 | 13.6 | 0.83 | 269 | 1.64 | 6.66 | M | Ice2 |
| 1ST_31OC17 | 40 | 4.5 | 350 | 17.9 | 0.45 | 317 | 2.81 | 6.81 | M | Ice2 |
| GRL_30OC17 | 25 | 3.9 | 384 | 16.8 | 2.10 | 325 | 0.43 | 6.96 | L | Ice2 |
| ERA1_04NO17 | 42 | 8.1 | 887 | 13.9 | 2.80 | 1,049 | 2.80 | 6.19 | S | Ice2 |
| ERA1_24AP18 | 170 | 15.5 | 1,493 | 15.3 | 0.51 | 2,195 | 5.52 | 17.39 | S | Ice2 |
| ERA1_10AU17 | 0 | 6.7 | 560 | <5.0 | 10.80 | 820 | 1.60 | 18.60 | S | Open3 |
| ERA3_10AU17 | 0 | 7 | 570 | <5.0 | 10.60 | 770 | 3.26 | 18.60 | S | Open3 |
| ERA1_12AU18 | 0 | 6.9 | 493 | 9.2 | 9.60 | 524 | 2.11 | 18.30 | S | Open3 |
| ERA4_10AU17 | 0 | 5.9 | 425 | <5.0 | 11.10 | 501 | 1.15 | 18.60 | S | Open3 |
| ERA4_12AU18 | 0 | 6 | 436 | 5.7 | 9.10 | 818 | 1.16 | 18.30 | S | Open3 |
| 1ST_09AU18 | 0 | 4.2 | 331 | 5.4 | 10.00 | 262 | 2.57 | 18.82 | M | Open3 |
| ERA2_10AU17 | 0 | 15.2 | 1,400 | 8 | 10.80 | 648 | 1.28 | 18.6 | S | Open3 |
| GRL_04SE16 | 0 | nd | nd | nd | 5.40 | 344 | Nd | 14.06 | L | Open4 |
| SPA_13AU17 | 0 | 3.2 | 271 | <5.0 | 12.40 | 295 | 0.85 | 18.10 | L | Open4 |
| GRL_07AU18 | 0 | 6.1 | 832 | 8.4 | 9.50 | 270 | 3.14 | 19.17 | L | Open4 |
| FER_13AU17 | 0 | 2.1 | 168 | <5.0 | 8.50 | 245 | 1.80 | 18.10 | L | Open4 |
| GRL_09SE15 | 0 | 3.2 | 372 | 5.2 | 12.40 | 266 | 1.29 | 14.17 | L | Open4 |
| GRL_23AU16 | 0 | 3.5 | 427 | 6.4 | 10.80 | 330 | Nd | 16.49 | L | Open4 |
| GRL_09AU17 | 0 | 3.7 | 298 | <5.0 | 10.80 | 278 | 1.71 | 18.77 | L | Open4 |
Sample name consists of the lake abbreviation from Figure 1 and the day, month, and year of sampling (JN refers to June).
When values were under the limit of detection, half of the detection limit value was used for statistics.
Lake order follows the Bray–Curtis group clustering from Figure 2, with (group) Ice1, Ice2, Open3, and Open4 indicated.
The detection limit for TP was 0.5 μg L–1.
DOC, dissolved organic carbon; TP, total phosphorus; TN, total nitrogen; Ice, ice thickness; Temp, temperature; Cond, conductivity; Chl a, chlorophyll a; DL, day length; Size, lake size category; L, large; M, medium; S, small (as defined in text); nd, no data available.