Table 1 Average dissimilarity of size-structure of Siphonaria lessonii at different shore heights based on the similarity percentage (SIMPER) analysis for lower (L), middle (M) and upper (U) shore samples
| Shore height | Average abundance | Contribution (%) | ||||
|---|---|---|---|---|---|---|
| Upper (U) | Lower (L) | Middle (M) | U vs M | U vs L | M vs L | |
| Range of size (mm) | ||||||
| 6–7 | 0 | 1.11 | 2.28 | 16.40 | 12.59 | 14.49 |
| 7–8 | 0.63 | 2.30 | 3.70 | 22.27 | 19.66 | 17.59 |
| 8–9 | 1.59 | 2.81 | 3.58 | 14.12 | 14.06 | 9.48 |
| 9–10 | 1.1 | 3.21 | 1.5 | 4.07 | 9.01 | 5.48 |
| 10–11 | 0.71 | 3.36 | 2.51 | 12.05 | 9.56 | 3.72 |
| 11–12 | 2.51 | 3.32 | 3.46 | 6.74 | 10.59 | 9.14 |
| 12–13 | 2.54 | 3.37 | 2.32 | 5.30 | 10.02 | 13.43 |
| 13–14 | 2.66 | 2.35 | 1.00 | 11.93 | 7.73 | 16.53 |
| 14–15 | 1.88 | 1.31 | 1.08 | 7.12 | 6.77 | 10.24 |