Table 2. Population structure estimated with AMOVA of microsatellite data for Chironomus piger and C. riparius.

Source of variation	d.f.	SS	MS	Percent of total variance	ΦST	p
Among C. piger sampling sites	10	38.673	3.867	3	0.027	0.040
Within sampling sites	85	265.460	3.123	97
Total	95	304.133	6.990
Among C. riparius sampling sites	8	44.717	5.590	5	0.046	0.010
Within sampling sites	91	334.972	3.681	95
Total	99	379.689	9.271

Significance of variance components was assessed with 9999 permutations.