Aarhus University Seal

Intracellular nitrate in sediments of an oxygen-deficient marine basin is linked to pelagic diatoms

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Standard

Intracellular nitrate in sediments of an oxygen-deficient marine basin is linked to pelagic diatoms. / Kamp, Anja; Petro, Caitlin; Røy, Hans et al.

In: FEMS Microbiology Ecology, Vol. 94, No. 8, fiy122, 2018.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Harvard

APA

CBE

MLA

Vancouver

Kamp A, Petro C, Røy H, Nielsen S, Carvalho PN, Stief P et al. Intracellular nitrate in sediments of an oxygen-deficient marine basin is linked to pelagic diatoms. FEMS Microbiology Ecology. 2018;94(8):fiy122. doi: 10.1093/femsec/fiy122

Author

Kamp, Anja ; Petro, Caitlin ; Røy, Hans et al. / Intracellular nitrate in sediments of an oxygen-deficient marine basin is linked to pelagic diatoms. In: FEMS Microbiology Ecology. 2018 ; Vol. 94, No. 8.

Bibtex

@article{6af7fe85c9b4439b9f0d90094aa92a04,
title = "Intracellular nitrate in sediments of an oxygen-deficient marine basin is linked to pelagic diatoms",
abstract = "Intracellular nitrate is an important electron acceptor in oxygen-deficient aquatic environments, either for the nitrate-storing microbes themselves, or for ambient microbial communities through nitrate leakage. This study links the spatial distribution of intracellular nitrate with the abundance and identity of nitrate-storing microbes in sediments of the Bornholm Basin, an environmental showcase for severe hypoxia. Intracellular nitrate (up to 270 nmol cm−3 sediment) was detected at all 18 stations along a 35-km transect through the basin and typically extended as deep as 1.6 cm into the sediment. Intracellular nitrate contents were particularly high at stations where chlorophyll contents suggested high settling rates of pelagic primary production. The depth distribution of intracellular nitrate matched that of the diatom-specific photopigment fucoxanthin in the upper 1.6 cm and calculations support that diatoms are the major nitrate-storing microbes in these sediments. In contrast, other known nitrate-storing microbes, such as sulfide-oxidizing bacteria and foraminifers, played only a minor role, if any. Strikingly, 18S rRNA gene sequencing revealed that the majority of the diatoms in the sediment were pelagic species. We conclude that intracellular nitrate stored by pelagic diatoms is transported to the seafloor by settling phytoplankton blooms, implying a so far overlooked {\textquoteleft}biological nitrate pump{\textquoteright}.",
keywords = "Bornholm Basin, hypoxia, anoxia, diatoms, large sulfur bacteria, Beggiatoa, Thioploca, photopigments, fucoxanthin, eutrophication, STORAGE, BORNHOLM BASIN, SULFUR BACTERIA, REDUCTION, BALTIC SEA, MINIMUM ZONE, NITROGEN, WATER SEDIMENTS, PHYTOPLANKTON, THIOPLOCA",
author = "Anja Kamp and Caitlin Petro and Hans R{\o}y and Susanne Nielsen and Carvalho, {Pedro N} and Peter Stief and Andreas Schramm",
year = "2018",
doi = "10.1093/femsec/fiy122",
language = "English",
volume = "94",
journal = "F E M S Microbiology Ecology",
issn = "0168-6496",
publisher = "Oxford University Press",
number = "8",

}

RIS

TY - JOUR

T1 - Intracellular nitrate in sediments of an oxygen-deficient marine basin is linked to pelagic diatoms

AU - Kamp, Anja

AU - Petro, Caitlin

AU - Røy, Hans

AU - Nielsen, Susanne

AU - Carvalho, Pedro N

AU - Stief, Peter

AU - Schramm, Andreas

PY - 2018

Y1 - 2018

N2 - Intracellular nitrate is an important electron acceptor in oxygen-deficient aquatic environments, either for the nitrate-storing microbes themselves, or for ambient microbial communities through nitrate leakage. This study links the spatial distribution of intracellular nitrate with the abundance and identity of nitrate-storing microbes in sediments of the Bornholm Basin, an environmental showcase for severe hypoxia. Intracellular nitrate (up to 270 nmol cm−3 sediment) was detected at all 18 stations along a 35-km transect through the basin and typically extended as deep as 1.6 cm into the sediment. Intracellular nitrate contents were particularly high at stations where chlorophyll contents suggested high settling rates of pelagic primary production. The depth distribution of intracellular nitrate matched that of the diatom-specific photopigment fucoxanthin in the upper 1.6 cm and calculations support that diatoms are the major nitrate-storing microbes in these sediments. In contrast, other known nitrate-storing microbes, such as sulfide-oxidizing bacteria and foraminifers, played only a minor role, if any. Strikingly, 18S rRNA gene sequencing revealed that the majority of the diatoms in the sediment were pelagic species. We conclude that intracellular nitrate stored by pelagic diatoms is transported to the seafloor by settling phytoplankton blooms, implying a so far overlooked ‘biological nitrate pump’.

AB - Intracellular nitrate is an important electron acceptor in oxygen-deficient aquatic environments, either for the nitrate-storing microbes themselves, or for ambient microbial communities through nitrate leakage. This study links the spatial distribution of intracellular nitrate with the abundance and identity of nitrate-storing microbes in sediments of the Bornholm Basin, an environmental showcase for severe hypoxia. Intracellular nitrate (up to 270 nmol cm−3 sediment) was detected at all 18 stations along a 35-km transect through the basin and typically extended as deep as 1.6 cm into the sediment. Intracellular nitrate contents were particularly high at stations where chlorophyll contents suggested high settling rates of pelagic primary production. The depth distribution of intracellular nitrate matched that of the diatom-specific photopigment fucoxanthin in the upper 1.6 cm and calculations support that diatoms are the major nitrate-storing microbes in these sediments. In contrast, other known nitrate-storing microbes, such as sulfide-oxidizing bacteria and foraminifers, played only a minor role, if any. Strikingly, 18S rRNA gene sequencing revealed that the majority of the diatoms in the sediment were pelagic species. We conclude that intracellular nitrate stored by pelagic diatoms is transported to the seafloor by settling phytoplankton blooms, implying a so far overlooked ‘biological nitrate pump’.

KW - Bornholm Basin

KW - hypoxia

KW - anoxia

KW - diatoms

KW - large sulfur bacteria

KW - Beggiatoa

KW - Thioploca

KW - photopigments

KW - fucoxanthin

KW - eutrophication

KW - STORAGE

KW - BORNHOLM BASIN

KW - SULFUR BACTERIA

KW - REDUCTION

KW - BALTIC SEA

KW - MINIMUM ZONE

KW - NITROGEN

KW - WATER SEDIMENTS

KW - PHYTOPLANKTON

KW - THIOPLOCA

U2 - 10.1093/femsec/fiy122

DO - 10.1093/femsec/fiy122

M3 - Journal article

C2 - 29931199

VL - 94

JO - F E M S Microbiology Ecology

JF - F E M S Microbiology Ecology

SN - 0168-6496

IS - 8

M1 - fiy122

ER -