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Title: Large-scale and mesoscale distribution of plankton biomass and metabolic activity in the Northeastern Central Atlantic
Authors: Hernández-León, Santiago 
Gómez, May 
Aristegui, J. 
Montero del Pino, María F. 
Torres Curbelo, Santiago 
Almeida Peña, Carlos 
Kühner, Eugen 
Brenning, Ullrich 
Hagen, Eberhard
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Plankton
Northeast Central Atlantic
Issue Date: 1999
Journal: Journal of Oceanography 
Abstract: Plankton biomass and indices of metabolism and growth [electron transport system (ETS), glutamate dehydrogenase (GDH) and aspartate transcarbamylase (ATC) activities] were studied over a 2,800 km east-west section of the tropical North Atlantic Ocean (21°N) in <200, 200–500 and >;500 µm size classes. On the large-scale, zooplankton (>;200 µm) enzymatic activities increased westward in the study section, where large cyanobacteria chains (Trichodesmium spp.) were observed. Parallel to it, an increase in medium calanoids (1–2 mm length) was observed towards the western part of the transect, whereas small calanoids (<1 mm) were dominant throughout the boundary area of the subtropical gyre. Microplankton ETS and mesoplankton ETS and ATC activities seemed to match the wave length of low frequency waves. Our results suggest that such waves are related to the observed enhancement of metabolic activity of micro- and mesoplankton. The large-scale and mesoscale variability observed give evidence of the inadequacy of assuming a steady-state picture of the euphotic zone of tropical and subtropical waters.
ISSN: 0916-8370
DOI: 10.1023/A:1007822921434
Source: Journal of Oceanography [ISSN 0916-8370], v. 55 (4), p. 471-482
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