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dc.contributor.authorMoran, Xose Anxelu G.
dc.contributor.authorGarcía, Francisca C.
dc.contributor.authorRøstad, Anders
dc.contributor.authorSilva, Luis
dc.contributor.authorAl-Otaibi, Najwa
dc.contributor.authorIrigoien, Xabier
dc.contributor.authorCalleja, Maria L.
dc.date.accessioned2021-09-07T07:14:09Z
dc.date.available2021-09-07T07:14:09Z
dc.date.issued2021-09
dc.date.submitted2021-05-28
dc.identifier.citationMorán, X. A. G., García, F. C., Røstad, A., Silva, L., Al-Otaibi, N., Irigoien, X., & Calleja, M. L. (2021). Diel dynamics of dissolved organic matter and heterotrophic prokaryotes reveal enhanced growth at the ocean’s mesopelagic fish layer during daytime. Science of The Total Environment, 150098. doi:10.1016/j.scitotenv.2021.150098
dc.identifier.issn0048-9697
dc.identifier.doi10.1016/j.scitotenv.2021.150098
dc.identifier.urihttp://hdl.handle.net/10754/670973
dc.description.abstractContrary to epipelagic waters, where biogeochemical processes closely follow the light and dark periods, little is known about diel cycles in the ocean's mesopelagic realm. Here, we monitored the dynamics of dissolved organic matter (DOM) and planktonic heterotrophic prokaryotes every 2 h for one day at 0 and 550 m (a depth occupied by vertically migrating fishes during light hours) in oligotrophic waters of the central Red Sea. We additionally performed predator-free seawater incubations of samples collected from the same site both at midnight and at noon. Comparable in situ variability in microbial biomass and dissolved organic carbon concentration suggests a diel supply of fresh DOM in both layers. The presence of fishes in the mesopelagic zone during daytime likely promoted a sustained, longer growth of larger prokaryotic cells. The specific growth rates were consistently higher in the noon experiments from both depths (surface: 0.34 vs. 0.18 d-1, mesopelagic: 0.16 vs. 0.09 d-1). Heterotrophic prokaryotes in the mesopelagic layer were also more efficient at converting extant DOM into new biomass. These results suggest that the ocean's twilight zone receives a consistent diurnal supply of labile DOM from diel vertical migrating fishes, enabling an unexpectedly active community of heterotrophic prokaryotes.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0048969721051731
dc.rightsThis is an open access article distributed under the terms of the Creative Commons CC-BY license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0
dc.titleDiel dynamics of dissolved organic matter and heterotrophic prokaryotes reveal enhanced growth at the ocean's mesopelagic fish layer during daytime
dc.typeArticle
dc.contributor.departmentBiological and Environmental Science and Engineering (BESE) Division
dc.contributor.departmentKing Abdullah University of Science and Technology (KAUST), Red Sea Research Center, Biological and Environmental Science & Engineering Division, 23955-6900 Thuwal, Saudi Arabia.
dc.contributor.departmentMarine Science Program
dc.contributor.departmentMicrobial oceanography Research Group
dc.contributor.departmentRed Sea Research Center (RSRC)
dc.identifier.journalScience of The Total Environment
dc.eprint.versionPublisher's Version/PDF
dc.contributor.institutionEnvironment and Sustainability Institute, University of Exeter, TR10 9FE Penryn, United Kingdom.
dc.contributor.institutionDepartment of Biology, Taif University, 26571 Taif, Saudi Arabia.
dc.contributor.institutionAZTI Tecnalia, 20110 Pasaia, Spain.
dc.contributor.institutionMax Planck Institute for Chemistry, 55128 Mainz, Germany.
dc.identifier.pages150098
kaust.personMoran, Xose Anxelu G.
kaust.personGarcía, Francisca C.
kaust.personRøstad, Anders
kaust.personSilva, Luis
kaust.personCalleja, Maria L.
dc.date.accepted2021-06-30
refterms.dateFOA2021-09-07T07:15:06Z


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This is an open access article distributed under the terms of the Creative Commons CC-BY license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Except where otherwise noted, this item's license is described as This is an open access article distributed under the terms of the Creative Commons CC-BY license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.