Biomasa y producción en diferentes clases de tamaño de fitoplancton en el Atlántico tropical

Translated title of the contribution: Size-fractionated phytoplankton biomass and production in the tropical Atlantic

Enrique Moreno-Ostos*, Ana Fernández, María Huete-Ortega, Beatriz Mouriño-Carballido, Alejandra Calvo-Díaz, Xose Anxelu G. Moran, Emilio Marañón

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Two meridional transects were conducted in the tropical and subtropical Atlantic to describe (i) the spatial variability of total and size-fractionated (picophytoplankton and phytoplankton >2 μm) chlorophyll a (chl a) concentration and primary production, (ii) the relative contribution of each phytoplankton size fraction to total biomass and carbon fixation, and (iii) the spatial variability of size-fractionated phytoplankton growth rate (P/B) and assimilation number (P/chl a) in the ocean. The highest chl a for both size fractions was observed in the Western Tropical Atlantic province (WTRA), while the lowest chl a was found in the upper mixed layer (UML) of the South Atlantic Tropical gyre (SATL). A similar pattern was found for carbon fixation. Within the SATL, the highest picophytoplankton contribution to total production was recorded at the Deep Chlorophyll Maximum (DCM), while the contribution of phytoplankton >2 μm was higher in the UML. Additionally, the relative contribution of large phytoplankton to total integrated primary production was higher than its contribution to total biomass. Both size fractions depicted maximum P/B and P/chl a in WTRA surface waters. In the SATL province, phytoplankton >2 μm showed the highest P/B and P/chl a along the UML, while picophytoplankton P/B and P/chl a peaked around the DCM. We suggest that the differential impact of light on small and large phytoplankton may help to explain the contrasting dynamics of the two size classes.

Translated title of the contributionSize-fractionated phytoplankton biomass and production in the tropical Atlantic
Original languageSpanish
Pages (from-to)379-389
Number of pages11
JournalScientia Marina
Volume75
Issue number2
DOIs
StatePublished - Jan 1 2011

Keywords

  • Biomass
  • Cell size
  • Oligotrophic subtropical gyres
  • Phytoplankton
  • Primary production
  • Spatial variability

ASJC Scopus subject areas

  • Oceanography
  • Aquatic Science

Fingerprint

Dive into the research topics of 'Size-fractionated phytoplankton biomass and production in the tropical Atlantic'. Together they form a unique fingerprint.

Cite this