Figure 1
Figure 2
Figure 3
The number of individuals and carapace width (mean ± SD) of E_ sinensis females and males collected from the Gulf of Gdańsk, the Vistula Lagoon and the Tagus Estuary_ The same letters indicate no significant differences (Wilcoxon matched pair test; p > 0_05)
| Site | Number of individuals | Carapace width (mm) | |
|---|---|---|---|
| Average | Range | ||
| Gulf of Gdańsk | 49 | 62.00 ±7.80 | 43.00–82.00 |
| Females | 20 | 61.26 ± 7.90a | 46.90–82.00 |
| Males | 29 | 62.29 ± 7.75a | 43.00–78.60 |
| Vistula Lagoon | 200 | 66.77 ± 8.38 | 33.26–89.07 |
| Females | 89 | 67.04 ± 6.38b | 53.70–81.49 |
| Males | 111 | 66.56 ± 9.22b | 33.26–89.07 |
| Tagus Estuary | 38 | 44.35 ± 6.27 | 20.63–56.42 |
| Females | 21 | 43.88 ± 7.29c | 20.63–44.53 |
| Males | 17 | 44.93 ± 4.87c | 37.83–56.42 |
The number of specimens with different food remains in their stomachs collected in the Gulf of Gdańsk, the Vistula Lagoon and the Tagus Estuary_ Not all remains were taxonomically identified (ni – not identified)
| Gulf of Gdańsk | Vistula Lagoon | Tagus Estuary | |
|---|---|---|---|
| Plant origin | 6 | 133 | 33 |
| Chlorophyta | 6 | 16 | ni |
| Tracheophyta | 0 | 50 | ni |
| No taxonomic identification | 0 | 67 | 33 |
| Animal origin | 25 | 57 | 13 |
| Crustacea | 4 | 1 | ni |
| Bivalvia | 16 | 29 | ni |
| Amphipoda | 3 | 2 | ni |
| Gastropoda | 2 | 1 | ni |
| Polychaeta | 0 | 5 | ni |
| No taxonomic identification | 0 | 16 | 13 |
| Detritus | 5 | 28 | 0 |