Populations of a cyprinid fish are self-sustaining despite widespread feminization of males

Table 2 Analysis of molecular variance (AMOVA) testing for partitioning of genetic variation among roach samples, grouped according to geography

Source of variation	d.f.	Sum of squares	Variance	% Total	P-value
Geographical partition, location ^a
Among locations	32	584.063	0.11631	2.27	<0.00001
Among samples within locations	6	35.197	0.00953	0.19	0.03226
Within samples	3,499	17,489.296	4.99837	97.54	<0.00001
Total	3,537	18,108.556	5.12421
Geographical partition, catchment ^b
Among groups	5	189.529	0.06309	1.22	<0.00001
Among samples within groups	33	429.731	0.08909	1.73	<0.00001
Within samples	3,499	17,489.296	4.99837	97.05	<0.00001
Total	3,537	18,108.556	5.15055

^aSamples from same location caught in different years are grouped; ^bSamples grouped by catchment (Aire, Arun, ‘Blackwater and Chelmer’, Nene, Thames and Trent).

ISSN: 1741-7007