Table 1.
A summary of key characteristics associated with each of our four study rivers (Environment Agency data 2008)
| Parameter | Evenlode | Cherwell | Chad Brook | Rother |
|---|---|---|---|---|
| Catchment area (km2) | 430.0 | 943.0 | 47.4 | 346.0 |
| Length (km) | 39.5 | 64.4 | 14.4 | 52.0 |
| Mean annual discharge (m3 s−1) | 3.8 | 5.5 | 0.3 | 2.3 |
| Dominant land use | Arable and pastoral agriculture | Arable and pastoral agriculture | Arable agriculture | Arable and pastoral agriculture |
| Year crayfish invasion first detected | 2000 | 1995 | 2000 | 1975 |
| Study approach used | Before-after | Before-after | Space-for-time | Space-for-time |
| Scalimetry used? | Yes | Yes | Yes | Yes |
| Stable isotope analysis used? | No | No | Yes | Yes |
| No. chub (non-invaded site) | 28 | 24 | 21 | 14 |
| No. chub (invaded site) | 40 | 34 | 15 | 18 |