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. In the Arctic Ocean, increased sea surface temperature and sea ice retreathave triggered shifts in phytoplankton communities. In Fram Strait,coccolithophorids have been occasionally observed to replace diatoms as thedominating taxon of spring blooms. Deep-sea benthic communities dependstrongly on such blooms, but with a change in quality and quantity ofprimarily produced organic matter (OM) input, this may likely haveimplications for deep-sea life. We compared the in situ responses of Arcticdeep-sea benthos to input of phytodetritus from a diatom(Thalassiosira sp.) and a coccolithophorid (Emiliania huxleyi) species. We traced the fate of 13C - and 15N -labelled phytodetritus into respiration, assimilation bybacteria and infauna in a 4-day and 14-day experiment. Bacteria were keyassimilators in the Thalassiosira OM degradation, whereasForaminifera and other infauna were at least as important as bacteria in theEmiliania OM assimilation. After 14 days, 5 times less carbon and3.8 times less nitrogen of the Emiliania detritus was recycledcompared to Thalassiosira detritus. This implies that theutilization of Emiliania OM may be less efficient than forThalassiosira OM. Our results indicate that a shift fromdiatom-dominated input to a coccolithophorid-dominated pulse could entail adelay in OM cycling, which may affect benthopelagic coupling.

Carbon and nitrogen turnover in the Arctic deep sea: in situ benthic community response to diatom and coccolithophorid phytodetritus