Table 2. Density of crab species in four habitat types at Yancheng National Nature Reserve.
| Crab species (num/per quadrat, n = 20) | Habitat type | df | F | p | |||
|---|---|---|---|---|---|---|---|
| Mu | Sp | Su | Ph | ||||
| 1. Eriocheir sinensis (C) | 1.95 ± 0.37b | 3.00 ± 0.46b | 2.05 ± 0.31b | 17.10 ± 1.79a | 3.76 | 60.22 | <0.001 |
| 2. Chiromantes haematochir (P) | — | 7.10 ± 2.02 | 8.60 ± 1.31 | 6.00 ± 0.72 | 2.57 | 0.812 | 0.449 |
| 3. Chiromantes dehaani (P) | — | 10.60 ± 2.49 | 6.40 ± 1.58 | 9.20 ± 1.18 | 2.57 | 1.36 | 0.265 |
| 4. Helice tientsinensis (P) | 2.05 ± 0.37c | 6.75 ± 1.36b | 11.65 ± 1.68a | 6.50 ± 0.80b, c | 3.76 | 11.28 | <0.001 |
| 5. Metaplax longipes (P) | 1.55 ± 0.32 | — | — | — | — | — | — |
| 6. Sesarma plicata (O) | — | 0.95 ± 0.22b | 3.5 ± 0.49a | — | 1.38 | 22.47 | <0.001 |
| 7. Philyra pisum (O) | 56.85 ± 17.81 | — | — | — | — | — | — |
| 8. Uca arcuata (P) | — | 19.65 ± 1.95a | 5.70 ± 1.03b | — | 1.38 | 39.91 | <0.001 |
| 9. Cleistostoma dilatatum (P) | — | — | 7.00 ± 0.94 | — | — | — | — |
| 10. Macrophthalmus dilatatus (P) | 30.50 ± 7.26 | — | — | — | — | — | — |
Notes:
Shown are the mean ± SE. Different letters (a–c) indicate significant differences between habitats (p < 0.05). “—” Indicates that no sample obtained.
Habitat types: Mu, Mudflat; Sp, S. alterniflora marsh; Su, S. salsa marsh; Ph, P. australis marsh. Functional feeding groups: C, Camivorous group; P, Phytophagous group; O, Omnivorous group.