Table 1.

Distances between sites in km.

	AB	AT	RO	EA1	EA2	V	X	XIII
AT	8.50
RO	2.52	5.98
EAI	4.10	6.72	1.58
EAII	4.60	7.22	2.08	0.50
V	4.26	6.88	1.74	0.16	0.66
X	4.36	6.98	1.84	0.26	0.76	0.10
XI	4.40	7.02	1.88	0.30	0.80	0.14	0.04
XIII	4.41	7.03	1.89	0.31	0.81	0.15	0.05	0.01

Distances were estimated by plotting GPS coordinates of the collection sites into GoogleEarth and then measuring the river-distance between sites with the measurement tool.