Table 1 Sampling details and stable isotope ratios of producers/organic matter pools (top part of the table) and consumers (bottom part of the table).

From: Increased sea ice cover alters food web structure in East Antarctica

Higher taxon	Taxon/sample nature	Method	Analysed tissue	N_13–14	N_14–15	δ¹³C (‰)	δ¹⁵N (‰)	δ³⁴S (‰)	SIAR
Phaeophyta	Himantothallus grandifolius	S	Holdfasts		16	−23.6 ± 1.8	3.3 ± 0.4	17.6 ± 0.5
	Himantothallus grandifolius	S	Stipes		16	−21.5 ± 1.1	3.6 ± 1.3	16.1 ± 1.0
	Himantothallus grandifolius	S	Blades	3	16	−21.9 ± 2.0	9.7 ± 1.2	13.1 ± 3.3
Rhodophyta	Phyllophora antarctica	S	Blades		17	−34.6 ± 1.6	3.4 ± 0.7	16.1 ± 0.9
-	Sympagic algae	S	Whole material	4	20	−12.5 ± 1.7	5.3 ± 0.5	5.6 ± 2.7
	Biofilm	S	Whole material	5	22	−20.0 ± 1.4	4.2 ± 0.7	10.5 ± 3.0
	Suspended particulate organic matter	N	Whole material	3	12	−26.7 ± 0.6	6.4 ± 0.8	18.5 ± 0.8
	Pygoscelis adeliae guano	H	Whole material		21	−28.5 ± 0.9	22.0 ± 1.4	15.9 ± 1.1
Porifera	Demospongiae Indet.	S	Body fragments		14	−19.2 ± 0.3	8.3 ± 0.5	16.3 ± 0.7	X
	Hemigellius sp.	S	Body fragments		19	−20.2 ± 0.5	10.4 ± 1.6	10.9 ± 2.0
	Homaxinella balfourensis	S	Body fragments		22	−19.5 ± 2.2	8.2 ± 1.7	16.2 ± 2.3	X
	Mycale acerata	S	Body fragments		17	−20.7 ± 0.4	10.6 ± 2.5	17.0 ± 0.5
Cnidaria	Isotealia antarctica	S	Ectoderm, lower body region		23	−16.2 ± 1.2	10.7 ± 0.8	11.8 ± 1.5
Nemertea	Parborlasia corrugatus	S/T	Body wall, anterior region		24	−19.3 ± 1.6	10.1 ± 1.0	14.8 ± 0.6
Nematoda	Deontostoma sp.	S	30 whole individuals		11	−24.2 ± 1.6	9.3 ± 0.7	14.3 ± 0.7
Polychaeta	Flabegraviera mundata	S	Body wall		22	−15.8 ± 0.7	7.1 ± 1.5	9.5 ± 2.1	X
(Errantia)	Harmothoe sp.	S	Whole animal without gut		30	−16.7 ± 1.8	8.7 ± 0.7	13.8 ± 1.6	X
Polychaeta	Perkinsiana sp.	S	Whole animal without gut		24	−18.3 ± 1.2	7.5 ± 1.4	14.3 ± 1.8	X
(Sedentaria)	Polycirrus sp.	S	Whole animal without gut		19	−16.9 ± 1.0	7.7 ± 1.3	14.7 ± 1.0	X
Sipuncula	Golfingia sp.	S	Body wall		14	−19.0 ± 1.2	7.6 ± 0.9	12.7 ± 0.7	X
Pycnogonida	Ammothea carolinensis	S	Whole animal without gut		19	−20.8 ± 3.4	11.0 ± 0.9	15.8 ± 0.9
	Decolopoda australis	S	Whole animal without gut		24	−19.9 ± 1.5	9.8 ± 1.1	16.4 ± 1.5
Amphipoda	Charcotia obesa	T	Whole animal without gut		27	−20.6 ± 0.6	9.1 ± 1.3	16.7 ± 0.2
Bivalvia	Adamussium colbecki	S	Shell adductor muscle	3	25	−19.5 ± 0.6	4.5 ± 0.3	14.6 ± 0.9	X
	Laternula elliptica	S	Siphon muscle		21	−22.4 ± 1.5	4.4 ± 0.5	15.4 ± 0.6	X
Gastropoda	Margarella sp.	S	10 whole animals without shell		11	−18.9 ± 0.5	8.0 ± 0.3	15.8 ± 0.7	X
	Marseniopsis sp.	S	Foot muscle		21	−22.8 ± 1.1	8.1 ± 0.1	16.2 ± 0.3	X
	Trophonella longstaffi	S	Foot muscle		22	−21.3 ± 0.3	8.0 ± 0.7	16.1 ± 0.1	X
Asteroidea	Acodontaster sp.	S	Podial vesicles		11	−18.7 ± 0.7	10.4 ± 0.7	17.3 ± 0.6
	Diplasterias brucei	S/T	Podial vesicles		21	−15.8 ± 1.7	8.6 ± 0.7	16.3 ± 0.8	X
	Odontaster validus	S/T	Podial vesicles	5	23	−13.9 ± 0.8	8.7 ± 0.5	15.4 ± 0.9	X
	Saliasterias brachiata	S	Whole animal without gut		13	−16.9 ± 0.3	10.2 ± 0.1	16.7 ± 0.4
Echinoidea	Sterechinus neumayeri	S	Aristotle’s lantern muscle	3	21	−14.5 ± 1.3	7.2 ± 0.7	14.6 ± 0.8	X
Ophiuroidea	Ophiura sp.	S	Whole animal without gut	5	23	−17.1 ± 0.9	7.2 ± 0.6	16.5 ± 0.9	X
Holothuroidea	Heterocucumis sp.	S	Body wall		23	−25.5 ± 1.0	6.3 ± 1.2	15.9 ± 0.8	X
	Staurocucumis sp.	S	Body wall		19	−24.3 ± 0.9	6.4 ± 1.1	16.2 ± 0.7	X

For each item, the table gives the sampling method (S: SCUBA diving, N: Niskin bottle, T: baited traps, H: hand collection), the analysed tissue, the number of specimens sampled in the austral summers of 2013–14 and 2014–15, the stable isotope ratios of carbon (δ¹³C, mean ± SD), nitrogen (δ¹⁵N, mean ± SD) and sulfur (δ³⁴S, mean ± SD) in specimens sampled in 2014–15 and whether the taxon was used for SIAR modelling (in which case there is a “X” in the column “SIAR”).

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Table 1 Sampling details and stable isotope ratios of producers/organic matter pools (top part of the table) and consumers (bottom part of the table).

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