Open Access
Table 1
Description of crayfish sites in the Drwęca River system and the number of captured specimens.
| Species / Stream name | Site number | Sampling date | Latitude (N) | Longitude (E) | Mean width (m) | Mean depth (m) | Dominating substrate |
Number of specimens |
|---|---|---|---|---|---|---|---|---|
| Faxonius limosus | ||||||||
| Drwęca | 1 | 03.10.2018 | 53.25761 | 19.42744 | 20.0 | 2.0 | Sand | 1 (adult) |
| Iłga | 2 | 06.09.2018 | 53.69066 | 19.77679 | 4.5 | 0.2 | Sand | >20 (adults + juveniles) |
| Iławka | 3 | 24.09.2015 | 53.53731 | 19.67278 | 6.0 | 0.4 | Sand | 6 (adults + juveniles) |
| Wel | 4 | 30.08.2017 | 53.39369 | 20.04155 | 6.0 | 0.3 | Pebbles | 2 (adults) |
| Wel | 5 | 30.08.2017 | 53.34255 | 19.95244 | 6.5 | 0.4 | Pebbles | 8 (adults + juveniles) |
| Wel | 6 | 31.08.2017 | 53.25507 | 19.86876 | 7.0 | 0.6 | Sand | 7 (adults + juveniles) |
| Wel | 7 | 30.08.2017 | 53.33415 | 19.76514 | 10.0 | 0.4 | Gravel | 1 (adult) |
| Górzanka | 8 | 26.09.2018 | 53.2256 | 19.65296 | 5.0 | 0.3 | Sand | 6 (adults + juveniles) |
| Ruziec | 9 | 24.10.2018 | 53.04432 | 19.10226 | 3.2 | 0.2 | Sand | 4 (adults + juveniles) |
| Lubianka | 10 | 24.10.2018 | 52.95106 | 19.05091 | 2.5 | 0.2 | Sand | 1 (adult) |
| Pacifastacus leniusculus | ||||||||
| Drwęca | 11 | 05.09.2018 | 53.63633 | 20.08522 | 6.0 | 1.0 | Sand | 4 (adults + juveniles) |
| Grabiczek | 12 | 05.09.2018 | 53.62589 | 20.04071 | 4.0 | 0.4 | Gravel | >40 (adults + juveniles) |
| Grabiczek | 13 | 06.09.2018 | 53.66331 | 20.02811 | 6.5 | 0.3 | Gravel | >30 (adults + juveniles) |
| Dylewka | 14 | 05.09.2018 | 53.62317 | 20.0375 | 3.5 | 0.1 | Pebbles | 2 (adults) |
| Astacus astacus | ||||||||
| Struga Rychnowska | 15 | 06.08.2019 | 53.09508 | 18.82638 | 2.5 | 0.2 | Gravel | >40 (adults + juveniles) |
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