Table 1.

Mean (+ 1 SD) values for seven geochemical markers (Li:Ca, Mg:Ca, Mn:Ca, Sr:Ca, Ba:Ca, δ¹³C, and δ¹⁸O) in the otoliths of age-0 yellowfin tuna (Thunnus albacares) from the Gulf of Mexico, Caribbean Sea, and two nurseries in the eastern Atlantic Ocean (EAO): Cape Verde and Gulf of Guinea.

Region by year	N	δ13C		δ18O		Li:Ca		Mg:Ca		Mn:Ca		Ba:Ca		Sr:Ca
		Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD	Mean	SD
2013
Gulf of Mexico	20	− 9.82	0.40	− 1.72	0.26	5.21	1.00	359.9	55.5	2.94	2.05	1.04	0.46	2194	164
Caribbean Sea	23	− 10.01	0.50	− 1.97	0.18	5.65	0.96	484.3	112.2	3.52	1.76	0.66	0.14	2480	360
EAO-Cape Verde	38	− 9.90	0.40	− 1.70	0.55	4.87	0.80	339.8	58.1	3.21	1.44	0.59	0.19	2312	278
EAO-Gulf of Guinea	21	− 9.70	0.50	− 1.50	0.29	5.15	0.76	384.8	80.8	3.59	1.99	0.64	0.26	2293	228
2014
Gulf of Mexico	20	− 10.02	0.43	− 1.64	0.20	4.77	0.76	405.6	79.6	2.80	1.39	0.69	0.41	2399	211
Caribbean Sea	26	− 9.59	0.45	− 1.66	0.24	5.29	1.23	401.0	89.3	2.45	1.16	0.57	0.18	2143	189
EAO-Cape Verde	27	− 9.99	0.44	− 1.70	0.24	5.46	1.05	358.4	65.2	3.72	1.46	0.69	0.27	2405	158
EAO-Gulf of Guinea	27	− 9.31	0.37	− 1.72	0.16	6.66	0.64	404.8	59.3	6.27	2.45	0.96	0.34	2292	191
2015-2016
Gulf of Mexico	22	− 9.99	0.42	− 1.65	0.19	4.87	0.83	405.8	76.6	2.84	1.40	0.71	0.39	2385	210
Caribbean Sea	20	− 9.36	0.59	− 1.69	0.27	6.05	1.09	464.7	97.2	2.76	1.34	0.75	0.22	2052	183
EAO-Cape Verde	30	− 9.69	0.39	− 1.69	0.19	6.48	5.75	379.7	207.9	5.89	2.31	0.92	0.36	2481	309
EAO-Gulf of Guinea	35	− 9.34	0.42	− 1.67	0.21	6.25	1.26	961.9	361.1	5.81	2.38	0.80	0.28	2166	255
2017
Gulf of Mexico	8	− 10.02	0.52	− 1.87	0.22	7.33	1.62	270.5	46.1	2.92	1.17	1.14	0.71	1953	182
Caribbean Sea	30	− 9.21	0.65	− 1.63	0.25	5.74	0.72	426.2	74.2	4.37	2.15	0.86	0.58	2276	200
EAO-Cape Verde	30	− 9.39	0.47	− 1.75	0.26	7.26	0.80	328.7	51.7	5.01	1.99	0.86	0.43	2170	211
EAO-Gulf of Guinea	30	− 9.31	0.50	− 1.88	0.26	6.92	1.06	375.1	66.9	5.73	2.77	1.83	0.34	2236	149

Samples sizes (N) and mean values are provided for four cohorts (2013, 2014, 2015–2016, 2017) of age-0 fish.