Table 1

Morphologic characteristics of the sampling sites, and number of specimens belonging to the different genetic groups according to the q values: native Mediterranean (q ≥ 0.998), hybrid/introgressed (0.002 < q < 0.998), alien Atlantic (q ≤ 0.002).

Sampling site Basin Watershed area (km2) Distance from the source (km) Average slope (%) Altitude (m a.s.l.) Average width (m) Average depth (cm) Mediterranean group (n° specimen) Hybrid group (n° specimen) Atlantic group (n° specimen)
Acquasanta Chienti 7.09 2.65 17.02 800 4.7 15.8 12
Ambro Tenna 18.23 5.18 11.04 684 3.5 25.2 27 16
Campodonico Potenza 32.04 8.53 8.53 491 3.7 16.0 15
Cesano Cesano 12.06 5.37 5.37 471 3.8 17.9 1 63
Cinisco Cesano 9.04 5.42 5.42 447 3.1 13.4 10
Nera Tiber 164.94 33.04 4.27 495 7.0 26.0 3 16
San Leonardo Tenna 1.01 20.69 1008 2.5 20.0 39
Tenna 1 Tenna 21.78 2.27 2.27 920 3.0 13.8 2
Tenna 2 Tenna 22.60 2.99 2.99 830 4.4 15.0 3 12
Torsa Tiber 12.38 4.91 4.91 568 3.1 17.4 34 5

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