ggplot(dat.tf,aes(x=amd,y=log(total.fruits+1),colour=nutrient)) +
  geom_point() + 
  stat_summary(aes(x= as.numeric(amd)),fun.y=mean,geom="line") +
  theme_bw() + theme(panel.margin=unit(0,"lines")) +
  scale_color_manual(values=c("#3B9AB2","#F21A00")) + # de la palette Wes Anderson Zissou
  facet_wrap(~popu)