Roelke and Cifuentes: Use of isotopes to assess groups of Scomberomorus cavalla 
543 
Table 2 
Mackerel collection data and range of stable isotope (C and N) values for each dorsal spine analyzed. 
nd = no data. 
Collection site 
Sex 
Fork length 
(cm) 
Month of 
collection 
Range of § 13 C 
(%c) for each 
spine 
Range of § 15 N 
(%o) for each 
spine 
Celestun, Mexico 
male 
91 
12 
4.1 
0.9 
Celestun, Mexico 
female 
81 
12 
1.5 
0.8 
Celestun, Mexico 
male 
78 
12 
2.5 
0.7 
Celestun, Mexico 
female 
76 
12 
3.3 
4.3 
Gulf Port, Mississippi 
male 
126 
7 
3.0 
0.2 
GulfPort, Mississippi 
female 
120 
7 
2.1 
0.9 
Gulf Port, Mississippi 
male 
100 
7 
2.6 
0.5 
Gulf Port, Mississippi 
male 
117 
7 
2.3 
0.2 
GulfPort, Mississippi 
male 
85 
7 
2.9 
0.5 
Gulf Port, Mississippi 
female 
113 
7 
2.5 
1.1 
Veracruz, Mexico 
male 
71 
5 
1.7 
0.7 
Veracruz, Mexico 
male 
68 
2 
3.1 
0.3 
Dzilam DeBravo, Mexico 
unknown 
73 
11 
3.3 
0.9 
Dzilam DeBravo, Mexico 
unknown 
51 
11 
0.7 
1.0 
Dzilam DeBravo, Mexico 
unknown 
54 
11 
1.8 
0.5 
Dzilam DeBravo, Mexico 
unknown 
71 
11 
2.3 
0.2 
Dzilam DeBravo, Mexico 
unknown 
78 
11 
1.8 
1.4 
Dzilam DeBravo, Mexico 
unknown 
70 
11 
1.4 
3.5 
Dzilam DeBravo, Mexico 
unknown 
64 
11 
0.7 
nd 
Dzilam DeBravo, Mexico 
unknown 
79 
11 
3.5 
0.2 
Dzilam DeBravo, Mexico 
unknown 
65 
11 
1.4 
0.2 
Dzilam DeBravo, Mexico 
unknown 
93 
11 
1.3 
0.3 
Dzilam DeBravo, Mexico 
unknown 
80 
11 
1.2 
0.4 
Dzilam DeBravo, Mexico 
unknown 
73 
11 
2.4 
1.1 
Dzilam DeBravo, Mexico 
unknown 
69 
11 
1.3 
0.2 
Dzilam DeBravo, Mexico 
unknown 
65 
11 
0.9 
4.1 
Dzilam DeBravo, Mexico 
unknown 
73 
11 
3.8 
0.5 
Dzilam DeBravo, Mexico 
unknown 
80 
11 
3.1 
3.0 
Dzilam DeBravo, Mexico 
unknown 
65 
11 
3.6 
2.8 
Dzilam DeBravo, Mexico 
unknown 
89 
11 
2.4 
3.2 
Dzilam DeBravo, Mexico 
unknown 
69 
11 
1.2 
1.8 
Dzilam DeBravo, Mexico 
unknown 
79 
11 
nd 
0.9 
Galveston, Texas 
unknown 
86 
7 
2.7 
0.6 
Galveston, Texas 
unknown 
70 
7 
2.3 
0.7 
Galveston, Texas 
unknown 
67 
7 
2.9 
0.3 
Port Aransas, Texas 
unknown 
81 
7 
3.9 
0.2 
Port Aransas, Texas 
unknown 
81 
7 
0.4 
0.8 
Port Aransas, Texas 
unknown 
113 
7 
4.3 
0.5 
Port Aransas, Texas 
unknown 
94 
7 
3.0 
2.9 
Port Aransas, Texas 
unknown 
75 
7 
3.0 
1.1 
Port Aransas, Texas 
unknown 
97 
7 
3.4 
0.7 
Port Aransas, Texas 
unknown 
88 
7 
2.2 
0.6 
Port Aransas, Texas 
unknown 
91 
7 
1.6 
0.1 
Port Aransas, Texas 
unknown 
121 
7 
5.4 
1.0 
Grand Isle, Louisiana 
unknown 
88 
7 
2.6 
0.1 
Grand Isle, Louisiana 
unknown 
99 
7 
2.5 
0.9 
Grand Isle, Louisiana 
unknown 
49 
7 
2.4 
1.1 
Grand Isle, Louisiana 
unknown 
74 
7 
1.1 
0.3 
Grand Isle, Louisiana 
unknown 
58 
7 
0.4 
0.1 
Grand Isle, Louisiana 
unknown 
73 
7 
2.7 
0.2 
Grand Isle, Louisiana 
unknown 
75 
7 
2.4 
0.2 
Grand Isle, Louisiana 
unknown 
96 
7 
4.2 
0.2 
Grand Isle, Louisiana 
unknown 
61 
7 
1.9 
0.9 
Grand Isle, Louisiana 
unknown 
80 
7 
3.1 
0.4 
Panama City, Florida 
female 
85 
6 
2.6 
0.3 
Panama City, Florida 
female 
80 
6 
2.9 
0.2 
