Fig. 4.

Relative abundance (% of total fatty acid content) of yolk fatty acids in relation to artificial incubation period (1, 6, and 12 days) of eggs from the urban and rural populations. a Total saturated fatty acids (SFA). b Total monounsaturated fatty acids (MUFA). c Total polyunsaturated fatty acids (PUFA). d Total ω-6 PUFA and total ω-3 PUFA. The asterisk in d indicates the significant interaction between habitat (urban or rural) and incubation time (see main text for details) for total ω-3 PUFA