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We determined potential meso-scale benthic-pelagic ecosystem coupling in the north equatorial Pacific by comparing surface chl-a concentration with sediment bacterial abundance and adenosine triphosphate (ATP) concentration (indication of active biomass). Water and sediment samples were latitudinally collected between 5 and 11N along 131.5W. Physical water properties of this area are characterized with three major currents: North Equatorial Current (NEC), North Equatorial Count Current (NECC), and South Equatorial Current (SEC). The divergence and convergence of the surface water occur at the boundaries where these currents anti-flow. This low latitude area (5~7N) appears to show high pelagic productivity (mean phytoplankton biomass=1266.0 mgC m) due to the supplement of high nutrients from nutrient-enriched deep-water via vertical mixing. But the high latitude area (9~11N) with the strong stratification exhibits low surface productivity (mean phytoplankton biomass=603.1 mgC m). Bacterial cell number (BCN) and ATP appeared to be the highest at the superficial layer and reduced with depth of sediment. Latitudinally, sediment BCN from low latitude (5~7N) was 9.8×10 cells cm, which appeared to be 3-times higher than that from high latitude (9~11N; 2.9×10 cells cm). Furthermore, sedimentary ATP at the low latitude (56.2 ng cm) appeared to be much higher than that of the high latitude (3.3 ng cm). According to regression analysis of these data, more than 85% of the spatial variation of benthic microbial biomass was significantly explained by the phytoplankton biomass in surface water. Therefore, the results of this study suggest that benthic productivity in this area is strongly coupled with pelagic productivity.

Potential Meso-scale Coupling of Benthic-Pelagic Production in the Northeast Equatorial Pacific