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We examined the abundance, cell size, and biomass of nanoflagellates throughout the water column and compared the results with data on prokaryote biomass and production at 6 sampling stations in the subarctic Pacific and the Bering Sea. For the upper (0-100 m), mesopelagic (100-1000 m), and bathypelagic layers (1000-3500 m), the integrated biomass of nanoflagellates was 310 ± 290, 130 ± 56, and 31 ± 17 mg C m -2 (mean ± SD; n = 6), respectively, accounting for 4.8 ± 4.5, 3.2 ± 4.8, and 0.83 ± 0.67% of prokaryote biomass. The turnover time of prokaryotes (biomass/ production) was significantly negatively correlated with the biomass of flagellates in the upper and bathypelagic waters, but the correlation was not significant in the mesopelagic layer. Assuming that nanoflagellates clear water 5 x 10 5 times greater than their own cell volume per hour, we estimated that grazing by nanoflagellates could consume 70 ± 46 and 48 ± 25% (mean ± SD; n = 6) of prokaryote production in meso- and bathypelagic layers, respectively. The above results suggest that nanoflagellates play a potentially significant role as consumers of prokaryotes in deep Pacific waters of subarctic regions.

Size distribution and biomass of nanoflagellates in meso- and bathypelagic layers of the subarctic Pacific