Table 2.
Abbreviations and descriptions of variables used in stepwise regression analysis.
| abbreviation | variable description |
|---|---|
| PERIM | site perimeter (km) |
| TYPE | site type (1, meadow; 2, lake; 3, lakeshore) |
| ELEV | elevation (m) |
| BUFO | census size of B. boreas |
| ELEG | census size of T. elegans |
| SIRT | census size of T. sirtalis |
| SNAKES | summed census size of T. elegans and T. sirtalis |
| NN-DIST | distance to nearest neighbour (km) |
| NN-PERIM | nearest-neighbour site perimeter (km) |
| NN-TYPE | nearest-neighbour site type (1, meadow; 2, lake; 3, lakeshore) |
| NN-ELEV | nearest-neighbour elevation (m) |
| NN-BUFO | nearest-neighbour B. boreas census size |
| NN-ELEG | nearest-neighbour T. elegans census size |
| NN-SIRT | nearest-neighbour T. sirtalis census size |
| NN-SNAKES | nearest-neighbour summed census size of T. elegans and T. sirtalis |
| PERIMDIFF | difference in perimeter between two sites (km) |
| TYPEDIFF | difference in type between two sites |
| ELEVDIFF | difference in elevation between two sites (m) |
| BUFODIFF | difference in B. boreas census sizes between two sites |
| ELEGDIFF | difference in T. elegans census sizes between two sites |
| SIRTDIFF | difference in T. sirtalis census sizes between two sites |
| SNAKEDIFF | difference in summed T. elegans and T. sirtalis census sizes between two sites |
| DIST | distance between sites (km) |