Population status of the native Cottus gobio after removal of the alien Salmo trutta: a case-study in two Mediterranean streams (Italy) | Knowledge and Management of Aquatic Ecosystems

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Table 2

CCA results. Canonical and correlation coefficients of environmental and biological variables with axis 1 and 2. P < 0.05 is in bold.

	Canonical coefficients		Correlations with axis

Environmental and biological parameters	AX1	AX2	AX1	p	AX2	p
BOD₅ (mg·L⁻¹)	−0.094	−0.160	−0.282	0.328	−0.082	0.780
Canopy cover (%)	0.263	−0.308	0.274	0.344	−0.042	0.886
Conductivity (S·cm⁻¹)	−0.443	−0.517	−0.343	0.230	−0.295	0.305
Dissolved oxygen (mg·L⁻¹)	−0.064	−0.650	0.409	0.147	−0.413	0.142
Distance from the source (km)	0.059	0.222	0.601	0.023	−0.143	0.625
Flow rate (m·s⁻¹)	0.514	−0.139	0.525	0.054	−0.398	0.159
Brown trout density (ind·m⁻²)	0.951	1.648	0.261	0.368	0.838	0.001
Brown trout standing crop (g·m⁻²)	0.175	−0.050	−0.338	0.237	0.537	0.048
Bullhead density (ind·m⁻²)	−0.919	0.168	−0.769	0.001	0.324	0.259
Bullhead standing crop (g·m⁻²)	−0.897	0.191	−0.871	0.001	0.368	0.195
Bullhead Kn	0.341	−0.470	−0.333	0.244	0.114	0.697

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