Table 4.

Trophic enrichment factors (TEFs, Δ¹³C, and Δ¹⁵N) of marine ciliates (Pseudokeronopsis pararubra, Protocruzia labiata, Strombidium sulcatum, and Uronemella filificum) fed with Chaetoceros calcitrans and Isochrysis galbana calculated from the equilibrium equation (Fry, 2006).

	Species name	Final value at equilibrium			TEFs
		n	Mean	SD
δ13C	Chaetoceros calcitrans (food)	31	−14.5	0.3
	Pseudokeronopsis pararubra	6	−13.8	0.1	0.69
	Protocruzia labiata	6	−13.5	0.2	1.00
	Strombidium sulcatum	6	−13.9	0.1	0.57
	Uronemella filificum	6	−14.0	0.2	0.51
	Isochrysis galbana (food)	29	−15.7	0.2
	Pseudokeronopsis pararubra	6	−15.0	0.2	0.64
	Protocruzia labiata	6	−14.7	0.2	0.95
	Strombidium sulcatum	6	−15.2	0.2	0.51
	Uronemella filificum	6	−15.3	0.1	0.40
δ15N	Chaetoceros calcitrans (food)	31	9.9	0.2
	Pseudokeronopsis pararubra	6	10.6	0.2	0.68
	Protocruzia labiata	6	11.0	0.1	1.06
	Strombidium sulcatum	6	11.3	0.1	1.38
	Uronemella filificum	6	11.7	0.2	1.73
	Isochrysis galbana (food)	29	4.7	0.2
	Pseudokeronopsis pararubra	6	5.5	0.1	0.76
	Protocruzia labiata	6	5.9	0.1	1.18
	Strombidium sulcatum	6	6.3	0.1	1.59
	Uronemella filificum	6	6.3	0.1	1.55