Ratio Neutral lipid/Polar lipids (proxy for energy storage) for males and females sardinella (Sardinella aurita ; Sardinella maderensis) sampled at two periods (January, March) of the upwelling season at Thiaroye harbor (Senegal). Linear mixed model shows an interactive effect between species and tissue, as well as an effect of month and sex (See Tab. S3 for statistical details).