Carbon and nitrogen stable isotope ratios of pelagic zooplankton elucidate ecohydrographic features in the oligotrophic Red Sea

Handle URI:
http://hdl.handle.net/10754/582462
Title:
Carbon and nitrogen stable isotope ratios of pelagic zooplankton elucidate ecohydrographic features in the oligotrophic Red Sea
Authors:
Kürten, Benjamin ( 0000-0003-0328-7847 ) ; Al-Aidaroos, Ali M.; Kurten, Saskia; El-Sherbiny, Mohsen M.; Devassy, Reny P.; Struck, Ulrich; Zarokanellos, Nikolaos; Jones, Burton ( 0000-0002-9599-1593 ) ; Hansen, Thomas; Bruss, Gerd; Sommer, Ulrich
Abstract:
Although zooplankton occupy key roles in aquatic biogeochemical cycles, little is known about the pelagic food web and trophodynamics of zooplankton in the Red Sea. Natural abundance stable isotope analysis (SIA) of carbon (δ13C) and N (δ15N) is one approach to elucidating pelagic food web structures and diet assimilation Integrating the combined effects of ecological processes and hydrography, ecohydrographic features often translate into geographic patterns in δ13C and δ15N values at the base of food webs. This is due, for example, to divergent 15N abundances in source end-members (deep water sources: high δ15N, diazotrophs: low δ15N). Such patterns in the spatial distributions of stable isotope values were coined isoscapes. Empirical data of atmospheric, oceanographic, and biological processes, which drive the ecohydrographic gradients of the oligotrophic Red Sea, are under-explored and some rather anticipated than proven. Specifically, five processes underpin Red Sea gradients: a) monsoon-related intrusions of nutrient-rich Indian Ocean water; b) basin scale thermohaline circulation; c) mesoscale eddy activity that causes up-welling of deep water nutrients into the upper layer; d) the biological fixation of atmospheric nitrogen (N2) by diazotrophs; and e) the deposition of aerosol-derived N. This study assessed relationships between environmental samples (nutrients, chlorophyll a), oceanographic data (temperature, salinity, current velocity [ADCP]), particulate organic matter (POM), and net-phytoplankton, with the δ13C and δ15N values of zooplankton collected in spring 2012 from 16°28’ to 26°57’N along the central axis of the Red Sea. The δ15N of bulk POM and most zooplankton taxa increased from North (Duba) to South (Farasan). The potential contribution of deep water nutrient-fueled phytoplankton, POM, and diazotrophs varied among sites. Estimates suggested higher diazotroph contributions in the North, a greater contribution of POM in the South, and of small phytoplankton in the central Red Sea. Consistent variation across taxonomic and trophic groups at latitudinal scale, corresponding with patterns of nutrient stoichiometry and phytoplankton composition, indicates that the zooplankton ecology in the Red Sea is largely influenced by hydrographic features. It suggests that the primary ecohydrography of the Red Sea is driven not only by the thermohaline circulation, but also by mesoscale activities that transports nutrients to the upper water layers and interact with the general circulation pattern. Ecohydrographic features of the Red Sea, therefore, aid in explaining the observed configurations of isoscapes at the macroecological scale.
KAUST Department:
Biological and Environmental Sciences and Engineering (BESE) Division
Citation:
Carbon and nitrogen stable isotope ratios of pelagic zooplankton elucidate ecohydrographic features in the oligotrophic Red Sea 2015 Progress in Oceanography
Publisher:
Elsevier BV
Journal:
Progress in Oceanography
Issue Date:
10-Nov-2015
DOI:
10.1016/j.pocean.2015.11.003
Type:
Article
ISSN:
00796611
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S0079661115002281
Appears in Collections:
Articles; Biological and Environmental Sciences and Engineering (BESE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorKürten, Benjaminen
dc.contributor.authorAl-Aidaroos, Ali M.en
dc.contributor.authorKurten, Saskiaen
dc.contributor.authorEl-Sherbiny, Mohsen M.en
dc.contributor.authorDevassy, Reny P.en
dc.contributor.authorStruck, Ulrichen
dc.contributor.authorZarokanellos, Nikolaosen
dc.contributor.authorJones, Burtonen
dc.contributor.authorHansen, Thomasen
dc.contributor.authorBruss, Gerden
dc.contributor.authorSommer, Ulrichen
dc.date.accessioned2015-11-22T08:09:08Zen
dc.date.available2015-11-22T08:09:08Zen
dc.date.issued2015-11-10en
dc.identifier.citationCarbon and nitrogen stable isotope ratios of pelagic zooplankton elucidate ecohydrographic features in the oligotrophic Red Sea 2015 Progress in Oceanographyen
dc.identifier.issn00796611en
dc.identifier.doi10.1016/j.pocean.2015.11.003en
dc.identifier.urihttp://hdl.handle.net/10754/582462en
dc.description.abstractAlthough zooplankton occupy key roles in aquatic biogeochemical cycles, little is known about the pelagic food web and trophodynamics of zooplankton in the Red Sea. Natural abundance stable isotope analysis (SIA) of carbon (δ13C) and N (δ15N) is one approach to elucidating pelagic food web structures and diet assimilation Integrating the combined effects of ecological processes and hydrography, ecohydrographic features often translate into geographic patterns in δ13C and δ15N values at the base of food webs. This is due, for example, to divergent 15N abundances in source end-members (deep water sources: high δ15N, diazotrophs: low δ15N). Such patterns in the spatial distributions of stable isotope values were coined isoscapes. Empirical data of atmospheric, oceanographic, and biological processes, which drive the ecohydrographic gradients of the oligotrophic Red Sea, are under-explored and some rather anticipated than proven. Specifically, five processes underpin Red Sea gradients: a) monsoon-related intrusions of nutrient-rich Indian Ocean water; b) basin scale thermohaline circulation; c) mesoscale eddy activity that causes up-welling of deep water nutrients into the upper layer; d) the biological fixation of atmospheric nitrogen (N2) by diazotrophs; and e) the deposition of aerosol-derived N. This study assessed relationships between environmental samples (nutrients, chlorophyll a), oceanographic data (temperature, salinity, current velocity [ADCP]), particulate organic matter (POM), and net-phytoplankton, with the δ13C and δ15N values of zooplankton collected in spring 2012 from 16°28’ to 26°57’N along the central axis of the Red Sea. The δ15N of bulk POM and most zooplankton taxa increased from North (Duba) to South (Farasan). The potential contribution of deep water nutrient-fueled phytoplankton, POM, and diazotrophs varied among sites. Estimates suggested higher diazotroph contributions in the North, a greater contribution of POM in the South, and of small phytoplankton in the central Red Sea. Consistent variation across taxonomic and trophic groups at latitudinal scale, corresponding with patterns of nutrient stoichiometry and phytoplankton composition, indicates that the zooplankton ecology in the Red Sea is largely influenced by hydrographic features. It suggests that the primary ecohydrography of the Red Sea is driven not only by the thermohaline circulation, but also by mesoscale activities that transports nutrients to the upper water layers and interact with the general circulation pattern. Ecohydrographic features of the Red Sea, therefore, aid in explaining the observed configurations of isoscapes at the macroecological scale.en
dc.language.isoenen
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S0079661115002281en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Progress in Oceanography. 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 Progress in Oceanography, 10 November 2015. DOI: 10.1016/j.pocean.2015.11.003en
dc.subjectFood websen
dc.subjectMacroecologyen
dc.subjectMesoscale eddiesen
dc.subjectRed Seaen
dc.subjectStable isotope analysisen
dc.subjectTrichodesmiumen
dc.subjectUpwellingen
dc.subjectZooplanktonen
dc.titleCarbon and nitrogen stable isotope ratios of pelagic zooplankton elucidate ecohydrographic features in the oligotrophic Red Seaen
dc.typeArticleen
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Divisionen
dc.identifier.journalProgress in Oceanographyen
dc.eprint.versionPost-printen
dc.contributor.institutionGEOMAR Helmholtz Centre for Ocean Research Kiel, Marine Ecology, Düsternbrooker Weg 20, 24105 Kiel, Germanyen
dc.contributor.institutionKing Abdulaziz University, Faculty of Marine Sciences, Department of Marine Biology, P.O. Box 80207, Jeddah 21589, Kingdom of Saudi Arabiaen
dc.contributor.institutionLeibniz Institute for Research on Evolution and Biodiversity, Museum für Naturkunde, Invalidenstraße 43, 10115 Berlin, Germanyen
dc.contributor.institutionSuez Canal University, Faculty of Science, Department of Marine Science, Ismailia 41522, Egypten
dc.contributor.institutionChristian Albrechts University Kiel, Research and Technology Centre Westcoast, Otto-Hahn-Platz 3 24118 Kiel, Germanyen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorKürten, Benjaminen
kaust.authorAl-Aidaroos, Ali M.en
kaust.authorKurten, Saskiaen
kaust.authorEl-Sherbiny, Mohsen M.en
kaust.authorDevassy, Reny P.en
kaust.authorZarokanellos, Nikolaosen
kaust.authorJones, Burtonen
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