Range-wide population genomics of common seadragons shows secondary contact over a former barrier and insights on illegal capture

Table 1 D statistics calculated among populations of common seadragons

P1	P2	P3	ABBA	BABA	D	f4-ratio	Z-score	p	p adj
Hobart	Eden	Melbourne	72.688	47.532	0.209	0.152	4.472	7.75E − 06	1.71E − 03
Portland	Melbourne	Eden	114.332	87.309	0.134	0.097	4.244	2.20E − 05	2.42E − 03
Kurnell	Eden	Melbourne	78.502	53.009	0.193	0.147	3.989	6.65E − 05	4.87E − 03
Jervis Bay	Eden	Melbourne	78.363	56.56	0.161	0.124	3.44	5.82E − 04	3.20E − 02

Out of all tested trios of common seadragon populations (220 comparisons), 4 comparisons were statistically significant after BH correction (p adj. < 0.05); other comparisons are in Additional File 1: Fig. S6. Positive D statistics represent an excess of sites supporting ABBA versus BABA pattern, indicating potential introgression between taxa P2 and P3. Ruby and leafy seadragons were used as the outgroup

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