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Methane fluxes from coastal sediments are enhanced by macrofauna
Methane and nitrous oxide are potent greenhouse gases (GHGs) that contribute to climate change. Coastal sediments are important GHG producers, but the contribution of macrofauna (benthic invertebrates larger than 1 mm) inhabiting them is currently unknown. Through a combination of trace gas, isotope...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5640653/ https://www.ncbi.nlm.nih.gov/pubmed/29030563 http://dx.doi.org/10.1038/s41598-017-13263-w |
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author | Bonaglia, Stefano Brüchert, Volker Callac, Nolwenn Vicenzi, Alessandra Chi Fru, Ernest Nascimento, Francisco J. A. |
author_facet | Bonaglia, Stefano Brüchert, Volker Callac, Nolwenn Vicenzi, Alessandra Chi Fru, Ernest Nascimento, Francisco J. A. |
author_sort | Bonaglia, Stefano |
collection | PubMed |
description | Methane and nitrous oxide are potent greenhouse gases (GHGs) that contribute to climate change. Coastal sediments are important GHG producers, but the contribution of macrofauna (benthic invertebrates larger than 1 mm) inhabiting them is currently unknown. Through a combination of trace gas, isotope, and molecular analyses, we studied the direct and indirect contribution of two macrofaunal groups, polychaetes and bivalves, to methane and nitrous oxide fluxes from coastal sediments. Our results indicate that macrofauna increases benthic methane efflux by a factor of up to eight, potentially accounting for an estimated 9.5% of total emissions from the Baltic Sea. Polychaetes indirectly enhance methane efflux through bioturbation, while bivalves have a direct effect on methane release. Bivalves host archaeal methanogenic symbionts carrying out preferentially hydrogenotrophic methanogenesis, as suggested by analysis of methane isotopes. Low temperatures (8 °C) also stimulate production of nitrous oxide, which is consumed by benthic denitrifying bacteria before it reaches the water column. We show that macrofauna contributes to GHG production and that the extent is dependent on lineage. Thus, macrofauna may play an important, but overlooked role in regulating GHG production and exchange in coastal sediment ecosystems. |
format | Online Article Text |
id | pubmed-5640653 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-56406532017-10-18 Methane fluxes from coastal sediments are enhanced by macrofauna Bonaglia, Stefano Brüchert, Volker Callac, Nolwenn Vicenzi, Alessandra Chi Fru, Ernest Nascimento, Francisco J. A. Sci Rep Article Methane and nitrous oxide are potent greenhouse gases (GHGs) that contribute to climate change. Coastal sediments are important GHG producers, but the contribution of macrofauna (benthic invertebrates larger than 1 mm) inhabiting them is currently unknown. Through a combination of trace gas, isotope, and molecular analyses, we studied the direct and indirect contribution of two macrofaunal groups, polychaetes and bivalves, to methane and nitrous oxide fluxes from coastal sediments. Our results indicate that macrofauna increases benthic methane efflux by a factor of up to eight, potentially accounting for an estimated 9.5% of total emissions from the Baltic Sea. Polychaetes indirectly enhance methane efflux through bioturbation, while bivalves have a direct effect on methane release. Bivalves host archaeal methanogenic symbionts carrying out preferentially hydrogenotrophic methanogenesis, as suggested by analysis of methane isotopes. Low temperatures (8 °C) also stimulate production of nitrous oxide, which is consumed by benthic denitrifying bacteria before it reaches the water column. We show that macrofauna contributes to GHG production and that the extent is dependent on lineage. Thus, macrofauna may play an important, but overlooked role in regulating GHG production and exchange in coastal sediment ecosystems. Nature Publishing Group UK 2017-10-13 /pmc/articles/PMC5640653/ /pubmed/29030563 http://dx.doi.org/10.1038/s41598-017-13263-w Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Bonaglia, Stefano Brüchert, Volker Callac, Nolwenn Vicenzi, Alessandra Chi Fru, Ernest Nascimento, Francisco J. A. Methane fluxes from coastal sediments are enhanced by macrofauna |
title | Methane fluxes from coastal sediments are enhanced by macrofauna |
title_full | Methane fluxes from coastal sediments are enhanced by macrofauna |
title_fullStr | Methane fluxes from coastal sediments are enhanced by macrofauna |
title_full_unstemmed | Methane fluxes from coastal sediments are enhanced by macrofauna |
title_short | Methane fluxes from coastal sediments are enhanced by macrofauna |
title_sort | methane fluxes from coastal sediments are enhanced by macrofauna |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5640653/ https://www.ncbi.nlm.nih.gov/pubmed/29030563 http://dx.doi.org/10.1038/s41598-017-13263-w |
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