Assessing Pigment-Based Phytoplankton Community Distributions in the Red Sea

Handle URI:
http://hdl.handle.net/10754/623675
Title:
Assessing Pigment-Based Phytoplankton Community Distributions in the Red Sea
Authors:
Kheireddine, Malika; Ouhssain, Mustapha; Claustre, Hervé; Uitz, Julia; Gentili, Bernard; Jones, Burton ( 0000-0002-9599-1593 )
Abstract:
Pigment-based phytoplankton community composition and primary production were investigated for the first time in the Red Sea in February-April 2015 to demonstrate how the strong south to north environmental gradients determine phytoplankton community structure in Red Sea offshore regions (along the central axis). Taxonomic pigments were used as size group markers of pico, nano-, and microphytoplankton. Phytoplankton primary production rates associated with the three phytoplankton groups (pico-, nano-, and microphytoplankton) were estimated using a bio-optical model. Pico- (Synechococcus and Prochlorococcus sp.) and Nanophytoplankton (Prymnesiophytes and Pelagophytes) were the dominant size groups and contributed to 49 and 38%, respectively, of the phytoplankton biomass. Microphytoplankton (diatoms) contributed to 13% of the phytoplankton biomass within the productive layer (1.5 Zeu). Sub-basin and mesoscale structures (cyclonic eddy and mixing) were exceptions to this general trend. In the southern Red Sea, diatoms and picophytoplankton contributed to 27 and 31% of the phytoplankton biomass, respectively. This result induced higher primary production rates (430 ± 50 mgC m−2 d−1) in this region (opposed to CRS and NRS). The cyclonic eddy contained the highest microphytoplankton proportion (45% of TChla) and the lowest picophytoplankton contribution (17% of TChla) while adjacent areas were dominated by pico- and nano-phytoplankton. We estimated that the cyclonic eddy is an area of enhanced primary production, which is up to twice those of the central part of the basin. During the mixing of the water column in the extreme north of the basin, we observed the highest TChla integrated (40 mg m−2) and total primary production rate (640 mgC m−2 d−1) associated with the highest nanophytoplankton contribution (57% of TChla). Microphytoplankton were a major contributor to total primary production (54%) in the cyclonic eddy. The contribution of picophytoplankton (Synechococcus and Prochlorococcus sp.) reached maximum values (49%) in the central Red Sea. Nanophytoplankton seem to provide a ubiquitous substantial contribution (30–56%). Our results contribute to providing new insights on the spatial distribution and structure of phytoplankton groups. An understanding and quantification of the carbon cycle in the Red Sea was made based on estimates of primary production associated with pico-, nano-, and microphytoplankton.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division; Red Sea Research Center (RSRC)
Citation:
Kheireddine M, Ouhssain M, Claustre H, Uitz J, Gentili B, et al. (2017) Assessing Pigment-Based Phytoplankton Community Distributions in the Red Sea. Frontiers in Marine Science 4. Available: http://dx.doi.org/10.3389/fmars.2017.00132.
Publisher:
Frontiers Media SA
Journal:
Frontiers in Marine Science
Issue Date:
10-May-2017
DOI:
10.3389/fmars.2017.00132
Type:
Article
ISSN:
2296-7745
Sponsors:
This study is funded by the King Abdullah University of Science and Technology (KAUST), Kingdom of Saudi Arabia.
Additional Links:
http://journal.frontiersin.org/article/10.3389/fmars.2017.00132/full
Appears in Collections:
Articles; Red Sea Research Center (RSRC); Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorKheireddine, Malikaen
dc.contributor.authorOuhssain, Mustaphaen
dc.contributor.authorClaustre, Hervéen
dc.contributor.authorUitz, Juliaen
dc.contributor.authorGentili, Bernarden
dc.contributor.authorJones, Burtonen
dc.date.accessioned2017-05-22T06:58:03Z-
dc.date.available2017-05-22T06:58:03Z-
dc.date.issued2017-05-10en
dc.identifier.citationKheireddine M, Ouhssain M, Claustre H, Uitz J, Gentili B, et al. (2017) Assessing Pigment-Based Phytoplankton Community Distributions in the Red Sea. Frontiers in Marine Science 4. Available: http://dx.doi.org/10.3389/fmars.2017.00132.en
dc.identifier.issn2296-7745en
dc.identifier.doi10.3389/fmars.2017.00132en
dc.identifier.urihttp://hdl.handle.net/10754/623675-
dc.description.abstractPigment-based phytoplankton community composition and primary production were investigated for the first time in the Red Sea in February-April 2015 to demonstrate how the strong south to north environmental gradients determine phytoplankton community structure in Red Sea offshore regions (along the central axis). Taxonomic pigments were used as size group markers of pico, nano-, and microphytoplankton. Phytoplankton primary production rates associated with the three phytoplankton groups (pico-, nano-, and microphytoplankton) were estimated using a bio-optical model. Pico- (Synechococcus and Prochlorococcus sp.) and Nanophytoplankton (Prymnesiophytes and Pelagophytes) were the dominant size groups and contributed to 49 and 38%, respectively, of the phytoplankton biomass. Microphytoplankton (diatoms) contributed to 13% of the phytoplankton biomass within the productive layer (1.5 Zeu). Sub-basin and mesoscale structures (cyclonic eddy and mixing) were exceptions to this general trend. In the southern Red Sea, diatoms and picophytoplankton contributed to 27 and 31% of the phytoplankton biomass, respectively. This result induced higher primary production rates (430 ± 50 mgC m−2 d−1) in this region (opposed to CRS and NRS). The cyclonic eddy contained the highest microphytoplankton proportion (45% of TChla) and the lowest picophytoplankton contribution (17% of TChla) while adjacent areas were dominated by pico- and nano-phytoplankton. We estimated that the cyclonic eddy is an area of enhanced primary production, which is up to twice those of the central part of the basin. During the mixing of the water column in the extreme north of the basin, we observed the highest TChla integrated (40 mg m−2) and total primary production rate (640 mgC m−2 d−1) associated with the highest nanophytoplankton contribution (57% of TChla). Microphytoplankton were a major contributor to total primary production (54%) in the cyclonic eddy. The contribution of picophytoplankton (Synechococcus and Prochlorococcus sp.) reached maximum values (49%) in the central Red Sea. Nanophytoplankton seem to provide a ubiquitous substantial contribution (30–56%). Our results contribute to providing new insights on the spatial distribution and structure of phytoplankton groups. An understanding and quantification of the carbon cycle in the Red Sea was made based on estimates of primary production associated with pico-, nano-, and microphytoplankton.en
dc.description.sponsorshipThis study is funded by the King Abdullah University of Science and Technology (KAUST), Kingdom of Saudi Arabia.en
dc.publisherFrontiers Media SAen
dc.relation.urlhttp://journal.frontiersin.org/article/10.3389/fmars.2017.00132/fullen
dc.rightsThis is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.en
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.titleAssessing Pigment-Based Phytoplankton Community Distributions in the Red Seaen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.contributor.departmentRed Sea Research Center (RSRC)en
dc.identifier.journalFrontiers in Marine Scienceen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionLaboratoire d'Océanographie de Villefranche, Sorbonne Université, UPMC Univ Paris 06, UMR 7093, Observatoire Oceanologique, Villefranche-Sur-Mer, Franceen
dc.contributor.institutionLaboratoire d'Océanographie de Villefranche, Centre Nationnal de la Recherche Scientifique, UMR 7093, Observatoire Oceanologique, Villefranche-Sur-Mer, Franceen
kaust.authorKheireddine, Malikaen
kaust.authorOuhssain, Mustaphaen
kaust.authorJones, Burtonen
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