Table 1 δ¹³Cand δ¹⁵N values (‰) measured from Fraser, Galiano, and Howe Reefs, and from two coastal regions: Barkley Sound and Washington coast.

Location	Year	δ¹³C (‰)		δ¹⁵N (‰)		n
Location	Year	mean	s.d.	mean	s.d.	n
Sponge
Fraser	2007	−21.19	0.08	14.74	0.31	5
	2009	−20.26	0.11	14.74	0.30	10
	2011	−20.45	0.40	15.64	0.45	9
	2014	−20.23	0.13	15.31	0.19	5
Galiano	2007	−19.80	0.22	14.96	0.30	5
	2009	−19.55	0.14	17.01	0.33	10
	2011	−19.86	0.15	16.43	0.53	11
	2014	−19.32	0.06	16.11	0.25	5
Howe	2009	−20.28	0.19	15.21	0.50	10
Coastal	2008	−19.68	0.13	16.22	0.44	6
POM
Fraser	2009	−23.84	1.08	9.63	2.08	9
Galiano	2009	−23.09	0.69	8.46	0.97	9
Howe	2009	−23.51	0.70	10.23	0.96	10
Sediments
Fraser	2011	−21.42	0.58	7.29	1.80	5
Fraser	2014	−21.69	1.18	4.80	0.32	5
Galiano	2011	−20.66	0.63	6.84	2.29	5
Galiano	2014	−21.69	1.18	4.80	0.32	5

Aphrocallistes vastus were sampled between 2007 and 2014 to assess spatial and temporal differences in isotopic signatures. POM was collected as a potential food source for the reefs in 2009, and sediments were sampled first in 2011 to assess whether sponge-derived material (fecal pellets) were traceable, then in 2014 as a potential food source for the reefs.

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