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Title: Bacterial production and losses to predators along an open ocean productivity gradient in the Subtropical North East Atlantic Ocean
Authors: Vaqué, Dolors
Alonso-Sáez, Laura
Aristegui, Javier 
Agustí, Susana
Duarte, Carlos M.
Montserrat Sala, M.
Vázquez-Domínguez, Evaristo
Gasol, Josep M.
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Bacterial production
Trophic gradien
NE Subtropical Atlantic
Issue Date: 2014
Publisher: 0142-7873
Journal: Journal of Plankton Research 
Abstract: We estimated the bacterial production and losses to predators along an open ocean trophic gradient from coastal upwelling waters to oligotrophic waters in the Subtropical Northern Atlantic Ocean. Two zonal sections (21 and 26°N) extending from the NW African shelf to the Open Atlantic Ocean at 26°W were sampled during September–October 2002 (autumn), and May–June 2003 (spring). The main goal was to elucidate whether the impacts of bacterial losses were more important in upwelling rather than in offshore waters. Whereas temperature and salinity decreased and nutrient concentrations increased from offshore to the coastal upwelling regions, phytoplankton, ciliate and bacterial biomass followed a similar trend increasing towards the upwelling zone. In addition, heterotrophic nanoflagellate biomass, bacterial production and grazing rates on bacteria did not follow this pattern, although the highest activities were recorded at upwelling stations. However, at the stations not affected by upwelling the average impact on bacteria expressed as a percentage of bacterial production consumed by predators in autumn and spring (values that varied between 70% ± 6% and 129% ± 15%, respectively) was significantly higher than at the upwelling stations (where it ranged between 49% ± 7% and 68% ± 5%, respectively). Our results suggest that in the upwelling areas bacteria escape from predators and growth cannot be balanced by grazing, while it is at the oligotrophic open ocean stations when, on occasions, grazing can overcome bacterial production.
ISSN: 0142-7873
DOI: 10.1093/plankt/fbt085
Source: Journal Of Plankton Research [ISSN 0142-7873], v. 36 (1), p. 198-213
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