Table 1. Specimens analysed in this study.
| Hybrid system | Basin | Tributary | Sampling point (Figure 1) | ID code | Sex | Capture date |
|---|---|---|---|---|---|---|
| AOLxPDU | Douro | Sousa River | 1 | cs3 | ♀ | 2008 |
| cs20 | ♂ | |||||
| cs19 | ♀ | |||||
| cs24 | ♂ | |||||
| Vouga | Caima River | 2 | cv23 | n.d. | 2007 | |
| cv26 | n.d. | |||||
| cv14 | ♂ | |||||
| cv21 | ♂ | |||||
| cv16 | ♂ | |||||
| AOLxPPO | Serra River | 3 | cv39 | ♂ | 2008 | |
| Mortágua River | 4 | zd20 | ♀ | |||
| Mondego | Alva River | 5 | zd52 | ♀ | 2007 | |
| Ceira River | 6 | zd61 | ♀ | |||
| Total | 13 |
Abbreviations: AOL, Achondrostoma oligolepis; ♀, female; ♂, male; n.d., not determined; PDU, Pseudochondrostoma duriense; PPO, Pseudochondrostoma polylepis.
Information on origin, sex and date of collection is given.