Energy acquisition strategy for reproduction in a semelparous squid

Table 1 Stable isotopic metrics of Argentinean shortfin squid

Maturity stage	δ15N(‰)		δ13C(‰)		Isotopic niche width
Maturity stage	Range	Mean ± SD	Range	Mean ± SD	SEAc	Non-overlap SEAc proportion
III	13.03 to 14.33	13.73 ± 0.40	− 17.83 to − 16.75	− 17.34 ± 0.40	0.57
						0.03
IV	13.71 to 15.87	14.64 ± 0.66	− 18.02 to − 15.9	− 17.32 ± 0.60	1.06
						0.59
V	13.96 to 15.88	14.88 ± 0.61	− 18.03 to − 15.82	− 17.17 ± 0.70	1.18
						0.46
VI	14.03 to 16.64	15.05 ± 0.68	− 17.99 to − 15.71	− 17.39 ± 0.68	1.32
						0.35
VII	13.50 to 15.70	14.93 ± 0.71	− 17.45 to − 15.93	− 17.03 ± 0.42	1.00
Pooled	13.03 to 16.64	14.69 ± 0.75	− 18.03 to − 15.71	− 17.26 ± 0.59

SEAc, corrected standard ellipse area; non-overlap SEAc proportion, overlap as proportion of the sum of the non-overlapping SEAc between two consecutive maturity stages. The non-overlap SEA_c proportion ranges from 0 (zero overlap in the isotopic niche widths between groups) to 1 (complete overlap in the isotopic niche widths between groups)

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