Photosynthetic parameters and primary production, with focus on large phytoplankton, in a temperate mid-shelf ecosystem

Handle URI:
http://hdl.handle.net/10754/556539
Title:
Photosynthetic parameters and primary production, with focus on large phytoplankton, in a temperate mid-shelf ecosystem
Authors:
Moran, Xose Anxelu G. ( 0000-0002-9823-5339 ) ; Scharek, Renate
Abstract:
Annual variability of photosynthetic parameters and primary production (PP), with a special focus on large (i.e. >2μm) phytoplankton was assessed by monthly photosynthesis-irradiance experiments at two depths of the southern Bay of Biscay continental shelf in 2003. Integrated chl a (22-198mgm-2) was moderately dominated by large cells on an annual basis. The March through May dominance of diatoms was replaced by similar shares of dinoflagellates and other flagellates during the rest of the year. Variability of photosynthetic parameters was similar for total and large phytoplankton, but stratification affected the initial slope αB [0.004-0.049mgCmg chl a-1h-1 (μmol photons m-2s-1)-1] and maximum photosynthetic rates PmB (0.1-10.7mgCmg chl a-1h-1) differently. PmB, correlated positively with αB only for the large fraction. PmB tended to respond faster to ambient irradiance than αB, which was negatively correlated with diatom abundance in the >2μm fraction. Integrated PP rates were relatively low, averaging 387 (132-892) for the total and 207 (86-629) mg C m-2d-1 for the large fraction, probably the result of inorganic nutrient limitation. Although similar mean annual contributions of large phytoplankton to total values were found for biomass and PP (~58%), water-column production to biomass ratios (2-26mgCmg chl-1d-1) and light utilization efficiency of the >2μm fraction (0.09-0.84gCg chl-1mol photons-1m2) were minimum during the spring bloom. Our results indicate that PP peaks in the area are not necessarily associated to maximum standing stocks.
KAUST Department:
Red Sea Research Center (RSRC)
Citation:
Photosynthetic parameters and primary production, with focus on large phytoplankton, in a temperate mid-shelf ecosystem 2015, 154:255 Estuarine, Coastal and Shelf Science
Publisher:
Elsevier BV
Journal:
Estuarine, Coastal and Shelf Science
Issue Date:
9-Jan-2015
DOI:
10.1016/j.ecss.2014.12.047
Type:
Article
ISSN:
02727714
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0272771415000098
Appears in Collections:
Articles; Red Sea Research Center (RSRC)

Full metadata record

DC FieldValue Language
dc.contributor.authorMoran, Xose Anxelu G.en
dc.contributor.authorScharek, Renateen
dc.date.accessioned2015-06-07T22:04:06Zen
dc.date.available2015-06-07T22:04:06Zen
dc.date.issued2015-01-09en
dc.identifier.citationPhotosynthetic parameters and primary production, with focus on large phytoplankton, in a temperate mid-shelf ecosystem 2015, 154:255 Estuarine, Coastal and Shelf Scienceen
dc.identifier.issn02727714en
dc.identifier.doi10.1016/j.ecss.2014.12.047en
dc.identifier.urihttp://hdl.handle.net/10754/556539en
dc.description.abstractAnnual variability of photosynthetic parameters and primary production (PP), with a special focus on large (i.e. >2μm) phytoplankton was assessed by monthly photosynthesis-irradiance experiments at two depths of the southern Bay of Biscay continental shelf in 2003. Integrated chl a (22-198mgm-2) was moderately dominated by large cells on an annual basis. The March through May dominance of diatoms was replaced by similar shares of dinoflagellates and other flagellates during the rest of the year. Variability of photosynthetic parameters was similar for total and large phytoplankton, but stratification affected the initial slope αB [0.004-0.049mgCmg chl a-1h-1 (μmol photons m-2s-1)-1] and maximum photosynthetic rates PmB (0.1-10.7mgCmg chl a-1h-1) differently. PmB, correlated positively with αB only for the large fraction. PmB tended to respond faster to ambient irradiance than αB, which was negatively correlated with diatom abundance in the >2μm fraction. Integrated PP rates were relatively low, averaging 387 (132-892) for the total and 207 (86-629) mg C m-2d-1 for the large fraction, probably the result of inorganic nutrient limitation. Although similar mean annual contributions of large phytoplankton to total values were found for biomass and PP (~58%), water-column production to biomass ratios (2-26mgCmg chl-1d-1) and light utilization efficiency of the >2μm fraction (0.09-0.84gCg chl-1mol photons-1m2) were minimum during the spring bloom. Our results indicate that PP peaks in the area are not necessarily associated to maximum standing stocks.en
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0272771415000098en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Estuarine, Coastal and Shelf Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Estuarine, Coastal and Shelf Science, 9 January 2015 DOI: 10.1016/j.ecss.2014.12.047en
dc.subjectphytoplanktonen
dc.subjectphotosynthesis-irradiance relationshipsen
dc.subjectprimary production: sizeen
dc.subjectannual variationsen
dc.subjectBay of Biscayen
dc.titlePhotosynthetic parameters and primary production, with focus on large phytoplankton, in a temperate mid-shelf ecosystemen
dc.typeArticleen
dc.contributor.departmentRed Sea Research Center (RSRC)en
dc.identifier.journalEstuarine, Coastal and Shelf Scienceen
dc.eprint.versionPost-printen
dc.contributor.institutionCentro Oceanográfico de Xixón, Instituto Español de Oceanografía, Camín de L'Arbeyal s/n, E-33212 Xixón, Asturies, Spainen
kaust.authorMoran, Xose Anxelu G.en
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