Apr 9-11, 2018. The 3rd intensive campaign in the GN/NT seasonal survey of ecosystem traits took place. Sara Marañón could not attend and Palli and Gunnhildur did her 15N pulse labelling experiment in the same plots in NT and Gunnhildur and Palli and Ben pre-processed the samples two weeks later. Sara M came earlier – March 11-16, 2018, to Iceland to do the 3rd intensive campaign for the Seasonal Experiment but the conditions did not allow it then, so it was postponed.