TABLE 2.

Carbon isotopic compositions of total biomass and FAMEs in gastropod tissues

Host species and host tissue	Sampling site; symbiont lineage	Mean total biomass ± SD	Mean carbon isotopic composition ( δ13C ± SD) of FAME:
			16:1	16:0	18:1	18:0	20:2
Alviniconcha sp. type 1, Gill	White Lady site, North Fiji Basin; γ-Proteobacteria	−30.7 ± 0.6	−38.4 ± 0.8	−38.2 ± 0.7	−37.4 ± 0.4	−36.9 ± 0.1	−37.0 ± 0.4
Alviniconcha sp. type 2,	STARMER II site, North Fiji Basin; ɛ-Proteobacteria
Gill		−10.8 ± 0.2	−4.7 ± 0.2	−4.7 ± 0.2	−5.7 ± 0.4	−4.6 ± 0.2	−6.3 ± 0.2
Mantle		−11.4 ± 0.3	−5.1 ± 0.2	−5.4 ± 0.1	−6.0 ± 0.4	−6.3 ± 0.3	−5.9 ± 0.9
Alviniconcha sp. type 2	Vienna Woods site, Manus Basin; ɛ-Proteobacteria
Gill		−13.3 ± 0.8	−6.6 ± 1.4	−8.9 ± 0.2	−7.6 ± 0.5	−10.3 ± 1.2	−9.3 ± 0.0
Mantle		−13.4 ± 0.2	−6.1 ± 0.2	−8.4 ± 0.9	−8.2 ± 0.6	−9.0 ± 1.0	−9.8 ± 0.7
Alviniconcha sp. type 1	PACMANUS field D, Manus Basin; γ-Proteobacteria
Gill		−30.5 ± 0.3	−37.5 ± 1.0	−38.0 ± 0.7	−36.6 ± 0.9	−36.6 ± 0.0	−36.8 ± 0.6
Mantle		−30.0 ± 0.1	−36.7 ± 0.4	−37.1 ± 0.2	−37.6 ± 0.1	−36.9 ± 0.3	−37.3 ± 0.1
Alviniconcha sp. type 2	PACMANUS field E, Manus Basin; ɛ-Proteobacteria
Gill		−10.6	−5.7	−5.7	−5.7	−5.4	−7.1
Mantle		−10.3	−6.4	−6.5	−7.3	−6.3	−7.4
Alviniconcha sp.	Vai Lili site, Lau Basin; γ-Proteobacteria
Gill		−30.5	−36.1	−36.8	−36.1	−35.8	−36.0
Mantle		−30.0	−35.6	−36.3	−36.1	−36.0	−35.7
Alviniconcha hessleri	Alice Springs, Mariana Basina; γ-Proteobacteria
Gill		−29.7 ± 0.4	−38.6 ± 0.9	−39.5 ± 0.6	−37.7 ± 0.5	−36.5 ± 0.7	−36.9 ± 0.4
Mantle		−28.4 ± 0.5	−36.1 ± 0.4	−36.8 ± 0.1	−36.4 ± 0.5	−35.7 ± 0.4	−36.5 ± 0.9
Alviniconcha aff. hessleri	Kairei Field, Central Indian Ridgeb; ɛ-Proteobacteria
Gill		−11.0 ± 0.1	−5.1 ± 0.9	−6.5 ± 0.9	−7.7 ± 0.8d	−8.5 ± 1.4	−7.6 ± 0.8
Mantle		−10.7 ± 0.1	NDc	−8.3 ± 0.9	−9.1 ± 1.4d	−9.2 ± 0.9	−8.6 ± 2.0

^aSuzuki et al. (21).

^bSuzuki et al. (22).

^cND, not determined.

^dThis value is for C_18:2.