Table 3: Niche characteristics of the fish species in the 1994 survey. Brown trout (Salmo trutta) and brook trout (Salvelinus fontinalis) were divided into young-of-the-year (0+) and older fish (1+). Inertia: variability of species niche; OMI: outlying mean index or niche position; T1: species tolerance or niche breadth; and T2: residual tolerance. Percentages are from inertia for each species. Significances are from permutation test of the null hypothesis that a species’ OMI value is not different from that expected by chance (1000 permutations).

SpeciesInertiaOMIT1T2OMI%T1%T2%P

Salmo trutta 1+12.470.441.3710.663.511.085.50.075
Salmo trutta 0+10.790.921.738.148.516.075.50.347
Salvelinus fontinalis 1+18.574.880.6713.3026.33.670.10.004
Salvelinus fontinalis 0+15.805.771.738.3036.510.952.60.012
Lampetra planeri10.000.711.218.107.112.080.90.808
Phoxinus phoxinus12.991.733.727.5513.328.658.10.049
Lota lota10.681.662.546.4715.623.860.60.518
Cottus gobio12.120.611.4910.035.012.382.70.000
Thymallus thymallus10.861.492.057.3213.818.967.40.833
Pungitius pungitius14.511.672.0510.7911.514.174.30.402