However, under 55% iPAR, M. caerulea had higher nitrogen uptake and photosynthesis capacity, whereas sessile oak grown with M. caerulea under 55% iPAR showed the same N uptake and a strong decrease in photosynthesis capacity compared to 11% iPAR. The findings reported here point to a very short-term response of photosynthesis and N uptake in a mixture of M. caerulea – oak saplings under 55% iPAR), which might partly result from greater nitrogen uptake by M. caerulea.