Fig. 4
Average values of leaf biochemical parameters of the seedlings of Cabañeros NP [chlorophyll content (Chl), nitrogen balance index (NBI), flavonoid content (Flav), and anthocyanin content (Anth)] for the three factors: (1) age (1- and 2-year-old seedlings; dark colors vs. light colors), (2) acorn attached or not (brown vs. green), and (3) fenced vs. non-fenced (left column vs. right). The standard deviation for the data set is shown. We displayed only data from February to June as sample size during July, August, and September was very low. Size of symbols is proportional to sample size