Table 3 Results of Mantel tests and partial Mantel tests performed on the Arz (8 sites) and Crano rivers (7 sites).

	Y = F_ST /(1−F_ST)				Y = allelic richness differential
	Arz		Crano		Arz		Crano
	r	p	r	p	r	p	r	p
Dist	0.163	0.237	0.86	<0.001	0.72	<0.001	0.645	0.014
N.obst	0.018	0.273	0.31	0.152	0.62	0.002	0.33	0.133
Height	0.174	0.171	0.222	0.302	0.58	0.004	0.59	0.057
Dist (N.obst)	0.338	0.036	0.885	0.006	0.45	0.016	0.513	0.06
Dist (Height)	0.02771	0.389	0.799	0.024	0.52	0.006	0.379	0.155
N.obst (Dist)	−0.300	0.901	−0.77	0.965	−0.067	0.623	−0.0487	0.581
Height (Dist)	0.066	0.322	−0.592	0.918	−0.102	0.6487	0.222	0.266

Factors in brackets correspond to controlled effects in partial mantel tests. N.obst = number of obstacles, Height = cumulated height (in meters), Dist = distance (in km).
Significant p-values are highlighted in bold.

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