Table 2.

Relative fatty acid (FA) composition of the neutral fraction of Astarte moerchi's digestive gland. Fatty acid values are mean % of the mass of total fatty acids ± standard error (s.e.). Only FA greater than 1% are shown, excluding branched FA. Important trophic markers are highlighted in bold: branched fatty acids are bacterial markers, 16 : 1ω7 and 20 : 5ω3 are the markers for diatoms, 18 : 4ω3 and 22 : 6ω3 are markers of dinoflagellates, and 20 : 1ω9 is marker of zooplankton. i-: iso- fatty acid; ai-: anteiso- fatty acid; SFA, saturated fatty acids; MUFA, monounsaturated fatty acids; PUFA, polyunsaturated fatty acids; AA, arachidonic acid; EPA, eicosapentaenoic acid; DHA, docosahexaenoic acid; MTFA, mass of total fatty acids.

fatty acid	relative proportion (mass % ± s.e.)
i-15 : 0	0.07 ± 0.03
i-16 : 0	0.79 ± 0.21
16 : 0	11.75 ± 0.49
i-17 : 0	0.82 ± 0.08
ai-17 : 0	0.44 ± 0.06
i-18 : 0	0.26 ± 0.12
18 : 0	3.78 ± 1.21
Σ SFA	20.15 ± 2.21
16 : 1ω7	17.26 ± 3.34
18 : 1ω9	2.04 ± 0.21
18 : 1ω7	4.51 ± 0.43
18 : 1ω5	4.11 ± 0.43
20 : 1ω11	2.43 ± 0.28
20 : 1ω9	1.11 ± 0.19
20 : 1ω7	7.60 ± 1.24
20 : 1ω5	3.00 ± 0.29
Σ MUFA	44.22 ± 1.76
16 : 2ω4	2.13 ± 1.42
18 : 4ω3	1.87 ± 0.33
18 : 2ω6	0.88 ± 0.11
20 : 4ω6 (AA)	2.35 ± 0.89
20 : 5ω3 (EPA)	17.77 ± 1.83
22 : 5ω3	1.01 ± 0.23
22 : 6ω3 (DHA)	4.90 ± 0.18
Σ PUFA	35.63 ± 1.54
ratios
16 : 1ω7/16 : 0	1.52 ± 0.30
ΣC16/ΣC18	1.86 ± 0.27
EPA/DHA	3.68 ± 0.41
MTFA mg g−1	7.80 ± 3.50