SD= standard deviation. n = number of samples included. % Assigned = total fraction of fatty acids assigned to distinct sources. MUFA= monounsaturated fatty acids. PUFA= polyunsaturated fatty acids. For definition of subregions and abbreviations (AO, YP, YSC, MIZ, OW) see text and Table 1. Letters A, B, C indicate assignment of fatty acids to the lipid pools explained in Section 4.3. Notice that the amounts of long chain n-saturates represent a mixture of lipid pools A and C, as revealed by their stable carbon isotopic composition (see Section 3.3.3). Individual fatty acid amounts contributing to the averages are provided in Appendix A.