Meiofauna increases bacterial denitrification in marine sediments

S. Bonaglia*, F. J.A. Nascimento, M. Bartoli, I. Klawonn, V. Brüchert

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Resumé

Denitrification is a critical process that can alleviate the effects of excessive nitrogen availability in aquatic ecosystems subject to eutrophication. An important part of denitrification occurs in benthic systems where bioturbation by meiofauna (invertebrates o1mm) and its effect on element cycling are still not well understood. Here we study the quantitative impact of meiofauna populations of different abundance and diversity, in the presence and absence of macrofauna, on nitrate reduction, carbon mineralization and methane fluxes. In sediments with abundant and diverse meiofauna, denitrification is double that in sediments with low meiofauna, suggesting that meiofauna bioturbation has a stimulating effect on nitrifying and denitrifying bacteria. However, high meiofauna densities in the presence of bivalves do not stimulate denitrification, while dissimilatory nitrate reduction to ammonium rate and methane efflux are significantly enhanced. We demonstrate that the ecological interactions between meio-, macrofauna and bacteria are important in regulating nitrogen cycling in soft-sediment ecosystems.

OriginalsprogEngelsk
Artikelnummer5133
TidsskriftNature Communications
Vol/bind5
ISSN2041-1723
DOI
StatusUdgivet - 16. okt. 2014
Udgivet eksterntJa

Fingeraftryk

Geologic Sediments
Denitrification
Sediments
sediments
ecosystems
bacteria
nitrates
Methane
methane
eutrophication
Nitrates
invertebrates
efflux
Ecosystem
nitrogen
Bacteria
cycles
Nitrogen
Aquatic ecosystems
Eutrophication

Citer dette

Bonaglia, S., Nascimento, F. J. A., Bartoli, M., Klawonn, I., & Brüchert, V. (2014). Meiofauna increases bacterial denitrification in marine sediments. Nature Communications, 5, [5133]. https://doi.org/10.1038/ncomms6133
Bonaglia, S. ; Nascimento, F. J.A. ; Bartoli, M. ; Klawonn, I. ; Brüchert, V. / Meiofauna increases bacterial denitrification in marine sediments. I: Nature Communications. 2014 ; Bind 5.
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abstract = "Denitrification is a critical process that can alleviate the effects of excessive nitrogen availability in aquatic ecosystems subject to eutrophication. An important part of denitrification occurs in benthic systems where bioturbation by meiofauna (invertebrates o1mm) and its effect on element cycling are still not well understood. Here we study the quantitative impact of meiofauna populations of different abundance and diversity, in the presence and absence of macrofauna, on nitrate reduction, carbon mineralization and methane fluxes. In sediments with abundant and diverse meiofauna, denitrification is double that in sediments with low meiofauna, suggesting that meiofauna bioturbation has a stimulating effect on nitrifying and denitrifying bacteria. However, high meiofauna densities in the presence of bivalves do not stimulate denitrification, while dissimilatory nitrate reduction to ammonium rate and methane efflux are significantly enhanced. We demonstrate that the ecological interactions between meio-, macrofauna and bacteria are important in regulating nitrogen cycling in soft-sediment ecosystems.",
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Meiofauna increases bacterial denitrification in marine sediments. / Bonaglia, S.; Nascimento, F. J.A.; Bartoli, M.; Klawonn, I.; Brüchert, V.

I: Nature Communications, Bind 5, 5133, 16.10.2014.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Meiofauna increases bacterial denitrification in marine sediments

AU - Bonaglia, S.

AU - Nascimento, F. J.A.

AU - Bartoli, M.

AU - Klawonn, I.

AU - Brüchert, V.

PY - 2014/10/16

Y1 - 2014/10/16

N2 - Denitrification is a critical process that can alleviate the effects of excessive nitrogen availability in aquatic ecosystems subject to eutrophication. An important part of denitrification occurs in benthic systems where bioturbation by meiofauna (invertebrates o1mm) and its effect on element cycling are still not well understood. Here we study the quantitative impact of meiofauna populations of different abundance and diversity, in the presence and absence of macrofauna, on nitrate reduction, carbon mineralization and methane fluxes. In sediments with abundant and diverse meiofauna, denitrification is double that in sediments with low meiofauna, suggesting that meiofauna bioturbation has a stimulating effect on nitrifying and denitrifying bacteria. However, high meiofauna densities in the presence of bivalves do not stimulate denitrification, while dissimilatory nitrate reduction to ammonium rate and methane efflux are significantly enhanced. We demonstrate that the ecological interactions between meio-, macrofauna and bacteria are important in regulating nitrogen cycling in soft-sediment ecosystems.

AB - Denitrification is a critical process that can alleviate the effects of excessive nitrogen availability in aquatic ecosystems subject to eutrophication. An important part of denitrification occurs in benthic systems where bioturbation by meiofauna (invertebrates o1mm) and its effect on element cycling are still not well understood. Here we study the quantitative impact of meiofauna populations of different abundance and diversity, in the presence and absence of macrofauna, on nitrate reduction, carbon mineralization and methane fluxes. In sediments with abundant and diverse meiofauna, denitrification is double that in sediments with low meiofauna, suggesting that meiofauna bioturbation has a stimulating effect on nitrifying and denitrifying bacteria. However, high meiofauna densities in the presence of bivalves do not stimulate denitrification, while dissimilatory nitrate reduction to ammonium rate and methane efflux are significantly enhanced. We demonstrate that the ecological interactions between meio-, macrofauna and bacteria are important in regulating nitrogen cycling in soft-sediment ecosystems.

U2 - 10.1038/ncomms6133

DO - 10.1038/ncomms6133

M3 - Journal article

VL - 5

JO - Nature Communications

JF - Nature Communications

SN - 2041-1723

M1 - 5133

ER -