Show simple item record

dc.contributor.authorLópez-Sandoval, Daffne C.
dc.contributor.authorDuarte, Carlos M.
dc.contributor.authorAgusti, Susana
dc.date.accessioned2021-06-14T11:54:13Z
dc.date.available2021-06-14T11:54:13Z
dc.date.issued2021-06-12
dc.date.submitted2020-05-13
dc.identifier.citationLópez-Sandoval, D. C., Duarte, C. M., & Agustí, S. (2021). Nutrient and temperature constraints on primary production and net phytoplankton growth in a tropical ecosystem. Limnology and Oceanography. doi:10.1002/lno.11849
dc.identifier.issn0024-3590
dc.identifier.issn1939-5590
dc.identifier.doi10.1002/lno.11849
dc.identifier.urihttp://hdl.handle.net/10754/669572
dc.description.abstractThe Red Sea depicts a north–south gradient of positively correlated temperature and nutrient concentration. Despite its overall oligotrophic characteristics, primary production rates in the Red Sea vary considerably. In this study, based on five cruises and a 2-year time series (2016–2018) sampling in the Central Red Sea, we determined phytoplankton photosynthetic rates (PP) by using 13C as a tracer and derived phytoplankton net growth rates (μ) and chlorophyll a (Chl a)-normalized photosynthesis (PB). Our results indicate a ninefold variation (14–125 mgC m−2 h−1) in depth-integrated primary production and reveal a marked seasonality in PP, PB, and μ. Depth-integrated PP remained <30 mg C m−2 h−1 during spring and summer, and peaked in autumn–winter, particularly in the southernmost stations (~17°N). In surface waters, phytoplankton grew at a slow rate (0.2 ± 0.02 d−1), with the population doubling every 3.5 days, on average. However, during the autumn–winter period, when Chl a concentrations peaked in the central and southern regions, μ increased to values between 0.60 and 0.84 d−1, while PB reached its maximum rate (7.8 mgC [mg Chl a]−1 h−1). We used path analysis to resolve direct vs. indirect components between correlations. Our results show that nutrient availability modulates the photosynthetic performance and growth of phytoplankton communities and that PB and μ fluctuations are not directly associated with temperature changes. Our study suggests that similarly to other oligotrophic warm seas, phosphorus concentration exerts a key role in defining photosynthetic rates and the biomass levels of phytoplankton communities in the region.
dc.description.sponsorshipThe authors thank Sebastian Overmans, Alexa Coello Camba, Sreejith Kottuparambil, Juan M. Ayala, and Gala González González for their field support during the Threats and DUST Cruise, and during the sampling at the time-series station. We also would like to thank CMOR personal and the crew of the R/V Thuwal and Al Azizi. This research has been funded by the King Abdullah University of Science and Technology (grant nos. BAS/1/1072-01-01 assigned to SA, BAS/1/1071-01-01 assigned to C.M.D., and CCF/1/1973-21-01 assigned to RSRC).
dc.publisherWiley
dc.relation.urlhttps://onlinelibrary.wiley.com/doi/10.1002/lno.11849
dc.rightsArchived with thanks to Limnology and Oceanography
dc.titleNutrient and temperature constraints on primary production and net phytoplankton growth in a tropical ecosystem
dc.typeArticle
dc.contributor.departmentRed Sea Research Center King Abdullah University of Science and Technology (KAUST) Thuwal-Jeddah Saudi Arabia
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentMarine Science Program
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.identifier.journalLimnology and Oceanography
dc.rights.embargodate2022-06-12
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Marine Science and Fisheries Sultan Qaboos University Muscat Oman
kaust.personLópez-Sandoval, Daffne C.
kaust.personDuarte, Carlos M.
kaust.personAgusti, Susana
kaust.grant.numberBAS/1/1072-01-01
kaust.grant.numberBAS/1/1071-01-01
kaust.grant.numberCCF/1/1973-21-01
dc.date.accepted2021-05-02
refterms.dateFOA2021-06-14T13:28:29Z


Files in this item

Thumbnail
Name:
LopezSandovaletal_RedSeaPP_Accepted_Version.pdf
Size:
2.194Mb
Format:
PDF
Description:
Accepted manuscript
Embargo End Date:
2022-06-12

This item appears in the following Collection(s)

Show simple item record