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Closed Access item Primary production in the Strait of Gibraltar: Carbon fixation rates in relation to hydrodynamic and phytoplankton dynamics

Authors:Macías, D.
Navarro, Gabriel
Bartual, Ana
Echevarría, F.
Huertas, I. Emma
Keywords:Air-sea CO2 exchange, Deep chlorophyll maximum, Primary production, Strait of Gibraltar
Issue Date:7-Apr-2009
Publisher:Elsevier
Citation:Estuarine Coastal and Shelf Science 83(2): 197-210 (2009)
Abstract:Primary production was studied at nine sites distributed within the Strait of Gibraltar (Southern Spain) and North-Western (NW) Alboran Sea by analyzing photosynthesis-irradiance (P–I) relationships and integrated primary production rates in relation to the different types of Deep Chlorophyll Maxima (DCM) detected in the area. The characteristics of the DCM were examined by several methods, including flow cytometry, quantification of transparent expolymer particles and fluorimetric measurements that were applied in order to assess the photo-physiological state of the phytoplankton assemblages with respect to their species composition and water column structure (hydrology). The photosynthetic parameters (derived from P–I relationships) and integrated primary production (range 6–644 mg m−2 d−1) responded greatly to the diverse DCM identified and thereby the spatial variability of the primary production observed in the region was found to depend upon the occurrence of the different types of phytoplankton accumulations, which were themselves indicative of the previous history of the water column. The net contribution of the primary production to the air–sea CO2 exchange process was also evaluated in the area. Results indicated that this region behaved as a net sink for the atmospheric CO2, with the intensity of the flux being strongly modulated by the wind intensity.
Description:14 páginas, 8 figuras, 3 tablas.
Publisher version (URL):http://dx.doi.org/10.1016/j.ecss.2009.03.032
URI:http://hdl.handle.net/10261/43688
ISSN:0272-7714
E-ISSNmetadata.dc.identifier.doi = DOI:1096-0015
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Appears in Collections:(ICMAN) Artículos

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