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The oceanic frontal region above the Chatham Rise east of New Zealand was\udinvestigated during the late austral summer season in February and\udMarch 2012. Despite its potential importance as a source of\udmarine-originating and climate-relevant compounds, such as\uddimethyl sulfide (DMS) and its algal precursor\uddimethylsulfoniopropionate (DMSP), little is known of the processes fuelling\udthe reservoirs of these sulfur (S) compounds in the water masses bordering\udthe subtropical front (STF). This study focused on two opposing short-term\udfates of DMSP-S following its uptake by microbial organisms (either its\udconversion into DMS or its assimilation into bacterial biomass) and has not\udconsidered dissolved non-volatile degradation products. Sampling took place\udin three phytoplankton blooms (B1, B2, and B3) with B1 and B3 occurring in\udrelatively nitrate-rich, dinoflagellate-dominated subantarctic waters, and B2\udoccurring in nitrate-poor subtropical waters dominated by coccolithophores.\udConcentrations of total DMSP (DMSPt) and DMS were high across the\udregion, up to 160 and 14.5 nmol L−1, respectively. Pools of DMSPt showed a strong association with overall phytoplankton biomass proxied by chlorophyll a (rs  =  0.83) likely because of the persistent dominance of dinoflagellates and coccolithophores, both DMSP-rich taxa. Heterotrophic microbes displayed low S assimilation from DMSP (less than\ud5 %) likely because their S requirements were fulfilled by high DMSP\udavailability. Rates of bacterial protein synthesis were significantly\udcorrelated with concentrations of dissolved DMSP (DMSPd,\udrs  =  0.86) as well as with the microbial conversion\udefficiency of DMSPd into DMS (DMS yield,\udrs  =  0.84). Estimates of the potential contribution of\udmicrobially mediated rates of DMS production\ud(0.1–27 nmol L−1 day−1) to the near-surface concentrations of DMS suggest that bacteria alone could not have sustained DMS pools at most stations, indicating an important role for phytoplankton-mediated DMS production. The findings from this study provide crucial information on the\uddistribution and cycling of DMS and DMSP in a critically under-sampled area\udof the global ocean, and they highlight the importance of oceanic fronts as\udhotspots of the production of marine biogenic S compounds

Dimethylsulfoniopropionate (DMSP) and dimethyl sulfide (DMS) cycling across contrasting biological hotspots of the New Zealand subtropical front