Leaf respiration ( R
) trend of P. lentiscus ( close squares ), P. latifolia ( open circles ), M. communis ( close triangles ) and Q. ilex ( open squares ) during the study period. The mean values for each month (± SE) are shown (n = 40 leaves). Mean values with the same letters are not significantly different (p ≥ 0.05). Lowercase letters indicate the differences among the species for each month, capital letters indicate the intra-specific differences during the study period.