Table 1.

Species, sampled tissue type, mean (±s.e.) shell-free body mass (g wet weight), sample size (n) and mean (±s.e.) of δ¹³C and δ¹⁵N of source samples used in MixSIAR models.

species	tissue type	body mass ± s.e.	n	δ13C ± s.e.	δ15N ± s.e.
Macrocystis pyrifera	lamina	n.a.	32	116 ± 7	1821 ± 106
Ophiopteris papillosa	dorsal disc	1.2 ± 0.1	5	−17.1 ± 0.3	3.7 ± 0.9
Ophioplocus esmarki	dorsal disc	2.5 ± 0.4	5	−15.5 ± 0.6	11.5 ± 0.4
Ophiothrix spiculata	dorsal disc	0.4 ± 0.1	5	−18.3 ± 0.2	7.0 ± 0.3
Thylacodes squamigerus	foot	1.8 ± 0.2	5	−17.0 ± 0.2	10.5 ± 0.2
Megabalanus californicus	whole	n.a.	5	−18.1 ± 0.2	10.6 ± 0.2
Chthamalus sp.	whole	n.a.	5	−18.0 ± 0.2	10.9 ± 0.1
Chaetopterus sp.	peristome	3.2 ± 0.4	5	−19.3 ± 0.1	9.0 ± 0.2
Cucumaria piperata	body wall	1.7 ± 0.9	5	−17.0 ± 0.3	8.6 ± 0.4
Pachythyone rubra	body wall	0.3 ± 0.1	5	−17.7 ± 0.3	7.3 ± 0.4
Cucumaria salma	body wall	8.3 ± 1.6	5	−16.1 ± 0.3	10.4 ± 0.1