Table 1.
Descriptive information on nine study ponds along a pH gradient.
| Population | A) | B) | C) | D) | E) | F) | G) | H) | I) | J) | K) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Tottajärn | 100 | 7 | 57°60N, 12°60E | 141 | 40 | 4.0 ± 0.2 | Natural & human | 15.5 | 6.0 | 0.2 | 462683 |
| Lomsjön | 50 | 11 | 57°76N, 12°88E | 268 | 20 | 4.0 ± 0.2 | Natural & human | 14.6 | 14.2 | 0.7 | 284400 |
| Sätila | 45 | 6 | 57°51N, 12°34E | 94 | 30 | 4.1 ± 0.2 | Natural & human | 15.1 | 9.7 | 0.1 | 263647 |
| Kungsbacka | 80 | 8 | 57°50N, 12°06E | 46 | 60 | 4.9 ± 0.2 | Natural & human | 17.0 | 10.2 | 0.2 | 65120 |
| Nitta* | > 500 | 57°87N, 13°21E | 240 | 70 | 5.7 ± 0.3 | Unknown | 14.2 | 2.0 | 5.7 | 286853 | |
| Viskafors | 270 | 6 | 57°65N, 12°87E | 146 | 60 | 5.6 ± 0.3 | Indirect liming | 14.4 | 6.1 | 1.4 | 754776 |
| Bergsjön | > 500 | 10 | 58°20N, 13°48E | 310 | 10 | 6.1 ± 0.3 | Unknown | 14.8 | 4.7 | 8.6 | 7221305 |
| Stubberud | 250 | 9 | 58°46N, 13°76E | 281 | 40 | 7.3 ± 0.2 | Limestone area | 14.8 | 7.0 | 2.9 | 34128 |
| Rud | 300 | 10 | 58°59N, 13°76E | 88 | 30 | 7.0 ± 0.2 | Limestone area | 15.4 | 6.5 | 2.2 | 267701 |
The A) approximate numbers of breeding R. arvalis females, B) number of full-sib families used per population, C) coordinates (N, E), D) altitude (m), E) forest canopy closure (%), F) mean ± SD pond pH, G) likely acidification history, H) average temperature (°C) during March - July 2009, I) predator density (per five sweeps), J) amphibian larval density (per five sweeps), and K) pond size (m3). Number of breeding females is based on clutch counts in 2007-2009. *Study site was only used for environmental information. Pond pH is based on averages of three sites within each pond in April 2008 and April, May and June in 2009.