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- W2334507718 abstract "MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 499:47-64 (2014) - DOI: https://doi.org/10.3354/meps10630 Effects of community composition and size structure on light absorption and nutrient uptake of phytoplankton in contrasting areas of the Alboran Sea Jesús M. Mercado1,*, Iria Sala1, Soluna Salles1, Dolores Cortés1, Teodoro Ramírez1, Esperanza Liger2, Lidia Yebra1, Begoña Bautista3 1Centro Oceanográfico de Málaga, Instituto Español de Oceanografía, 29640 Fuengirola, Málaga, Spain 2Departamento de Física Aplicada II, University of Málaga, 29070 Málaga, Spain 3Departamento de Ecología y Geología, University of Málaga, 29070 Málaga, Spain *Corresponding author: jesus.mercado@ma.ieo.es ABSTRACT: Biomass size distribution, light absorption properties and carbon and nitrogen uptake rates were analysed in phytoplankton assemblages along coast–offshore gradients. During sampling, the coastal stations were affected by upwelling. In contrast, the offshore stations were located at the western Alboran anticyclonic gyre core. Surface nitrate concentration was >1 µM at the coastal stations and lower than the detection limit at the offshore stations. Furthermore, the lower limit of the upper mixed layer was deeper at the coast (ca. 20-30 m depth) than offshore (80-100 m depth). In terms of biomass, the coastal communities were dominated by diatoms; dinoflagellates and picoplankton contributed to phytoplankton biomass by <30 and 7%, respectively. At the offshore stations, diatom abundance decreased while dinoflagellate abundance did not change significantly in comparison to the coastal stations, with dinoflagellates becoming the dominant group in terms of biomass. The mean length of the microplankton cells increased from the coast to offshore due to a decrease in abundance of diatoms <50 µm in length. The coastal communities featured lower chl a specific absorption coefficients in the blue spectral band than found in the offshore communities. In contrast, the biomass-specific uptake rates of inorganic carbon and nitrate estimated for the coastal communities (3.5 nmol C µg-1 POC h-1 and 0.2 nmol N µg-1 POC h-1, respectively) were higher than for the offshore communities (1.0 nmol C µg-1 POC h-1 and 0.03 nmol N µg-1 POC h-1, respectively). These differences in light absorption efficiency and nutrient uptake rates were significantly correlated with the change in the mean cell size of the communities moving from the coast to offshore, which were mainly due to the decrease in biomass of diatoms <50 µm which effectively increased the dinoflagellate contribution to phytoplankton biomass. KEY WORDS: Anticyclonic gyre · Primary productivity · Diatoms · Upwelling · Carbon uptake · Nutrients Full text in pdf format PreviousNextCite this article as: Mercado JM, Sala I, Salles S, Cortés D and others (2014) Effects of community composition and size structure on light absorption and nutrient uptake of phytoplankton in contrasting areas of the Alboran Sea. Mar Ecol Prog Ser 499:47-64. https://doi.org/10.3354/meps10630 Export citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 499. Online publication date: March 03, 2014 Print ISSN: 0171-8630; Online ISSN: 1616-1599 Copyright © 2014 Inter-Research." @default.
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- W2334507718 title "Effects of community composition and size structure on light absorption and nutrient uptake of phytoplankton in contrasting areas of the Alboran Sea" @default.
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- W2334507718 doi "https://doi.org/10.3354/meps10630" @default.
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