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We use ALMA and JVLA observations of the galaxy cluster Cl J1449+0856 atz=1.99, in order to study how dust-obscured star-formation, ISM content and AGNactivity are linked to environment and galaxy interactions during the crucialphase of high-z cluster assembly. We present detections of multiple transitionsof $^{12}$CO, as well as dust continuum emission detections from 11 galaxies inthe core of Cl J1449+0856. We measure the gas excitation properties,star-formation rates, gas consumption timescales and gas-to-stellar mass ratiosfor the galaxies.  We find evidence for a large fraction of galaxies with highly-excitedmolecular gas, contributing $>$50% to the total SFR in the cluster core. Wecompare these results with expectations for field galaxies, and conclude thatenvironmental influences have strongly enhanced the fraction of excitedgalaxies in this cluster. We find a dearth of molecular gas in the galaxies'gas reservoirs, implying a high star-formation efficiency (SFE) in the clustercore, and find short gas depletion timescales $\tau$<0.1-0.4 Gyrs for allgalaxies. Interestingly, we do not see evidence for increased specificstar-formation rates (sSFRs) in the cluster galaxies, despite their high SFEsand gas excitations. We find evidence for a large number of mergers in thecluster core, contributing a large fraction of the core's total star-formationcompared with expectations in the field. We conclude that the environmentalimpact on the galaxy excitations is linked to the high rate of galaxy mergers,interactions and active galactic nuclei in the cluster core.

Merger driven star-formation activity in Cl J1449+0856 at z=1.99 as seen by ALMA and JVLA