Table 6.

Intra-population (OPT vs. DEF) results of Mann–Whitney U test (mean ± SE, number of larvae, Z adjusted and p) between surveys (GOM17 and GOM18) for maternal isotopic signatures (δ¹⁵N_maternal, δ¹³C_maternal) estimated by equations based on samples of each survey sample. NS = Non-significant. ** p < 0.01.

	GOM17						GOM18
	OPT +		DEF –		MW—U Test		OPT +		DEF –		MW—U Test
	Mean ± SD	n	Mean ± SD	n	Z-adjusted	p	Mean ± SD	n	Mean ± SD	n	Z-adjusted	p
δ15Nmaternal	11.90 ± 0.44	15	12.50 ± 0.61	15	2.76	**	11.50 ± 0.33	11	12.60 ± 0.67	14	3.5	**
(estimated)
δ13Cmaternal	−17.80 ± 0.22	15	−18.10 ± 0.46	15	−1.68	NS	−17.80 ± 0.35	11	−17.90 ± 0.17	14	−0.6	NS
(estimated)