Research Article
Specific Niche Characteristics Facilitate the Invasion of an Alien Fish Invader in Boreal Streams
Table 2
The number of sites occupied by the native species and the alien brook trout (Salvelinus fontinalis). Total number of sites was 78 in both years.
| Species | Number of sites (1994) | Number of sites (2004) | Difference |
| Salmo trutta 1+ | 56 | 64 | 8 | Salmo trutta 0+ | 32 | 23 | −9 | Salvelinus fontinalis 1+ | 21 | 28 | 7 | Salvelinus fontinalis 0+ | 15 | 27 | 12 | Lampetra planeri | 32 | 22 | −10 | Phoxinus phoxinus | 37 | 54 | 17 | Lota lota | 32 | 7 | −25 | Cottus gobio | 69 | 70 | 1 | Thymallus thymallus | 8 | 12 | 4 | Pungitius pungitius | 16 | 20 | 4 |
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