Table 1
General characteristics of 14 floodplain waterbodies (FWBs) during ordinary-flow periods
| FWB | Type | Area (m2) | Distance (m)† | Connecting height (m)‡ | Unionid mussel (CPUE)§ |
|---|---|---|---|---|---|
| 1 | Connected | 12898 | 0 | 0 | 16.9 |
| 2 | Connected | 7529 | 0 | 0 | Presence |
| 3 | Isolated | 3213 | 31 | 3.90 | 0 |
| 4 | Isolated | 2223 | 186 | 4.09 | 25.0 |
| 5 | Isolated | 1530 | 216 | 4.09 | 13.8 |
| 6 | Isolated | 468 | 97 | 4.40 | 0 |
| 7 | Isolated | 3044 | 185 | 4.59 | 1.8 |
| 8 | Isolated | 1837 | 137 | 4.59 | 0 |
| 9 | Isolated | 988 | 137 | 4.59 | 0 |
| 10 | Isolated | 659 | 244 | 4.59 | 0 |
| 11 | Isolated | 266 | 200 | 4.59 | 0 |
| 12 | Isolated | 1436 | 168 | 4.80 | 0 |
| 13 | Isolated | 744 | 223 | 4.80 | 0 |
| 14 | Isolated | 613 | 227 | 4.80 | 0 |
‡ Elevation (water level) connecting with main river channel based on digital elevation map derived from airborne laser scanning in December 2017.
§ Number of individual mussels caught by survey personnel in 1 h (CPUE: catch per unit effort) based on intensive survey in 2018–2020 conducted with reference to Negishi et al. (2012b). “Presence” was derived from our sporadic survey that did not apply the protocols of Negishi et al. (2012b).
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