Uneven response of microbial communities to intense dust deposition across the coastal transition zone off Mauritania
The eastern North Atlantic region receives large Saharan dust deposition inputs, providing nutrients and trace metals to the surface waters. We assessed the effects of intense dust deposition on phytoplankton and bacteria cell abundances, metabolic activity, and community structure, along a surface...
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ftdoajarticles:oai:doaj.org/article:122d7febf9cf47289b75053b10eee852 2023-05-15T17:31:42+02:00 Uneven response of microbial communities to intense dust deposition across the coastal transition zone off Mauritania Clàudia Pérez-Barrancos María D. Gelado-Caballero Nauzet Hernández-Hernández Isabel Baños Markel Gómez-Letona María F. Montero Jesús M. Arrieta Javier Arístegui 2022-11-01T00:00:00Z https://doi.org/10.3389/fmars.2022.999729 https://doaj.org/article/122d7febf9cf47289b75053b10eee852 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2022.999729/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.999729 https://doaj.org/article/122d7febf9cf47289b75053b10eee852 Frontiers in Marine Science, Vol 9 (2022) dust bioassay primary production bacterial production plankton community molecular diversity eastern North Atlantic Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2022 ftdoajarticles https://doi.org/10.3389/fmars.2022.999729 2022-12-30T19:46:20Z The eastern North Atlantic region receives large Saharan dust deposition inputs, providing nutrients and trace metals to the surface waters. We assessed the effects of intense dust deposition on phytoplankton and bacteria cell abundances, metabolic activity, and community structure, along a surface productivity gradient in the Mauritanian-Senegalese upwelling system. Dust concentrations above 4 mg L-1 were added to triplicate microcosms in four bioassay experiments, each lasting three days, increasing nitrate, phosphate and, to a lesser extent, silicate seawater concentrations. Even though dust deposition enhanced both heterotrophic and photosynthetic activity, bacterial production responded faster and stronger than primary production, especially as oligotrophic conditions increased. Bacterial production rates in oligotrophic waters almost tripled one day after the enrichment. However, such favorable response could not be observed on the total organic carbon production until a lag phase of 2 days and whilst under moderate eutrophic conditions. Dust enrichment benefited the presence of certain planktonic groups over others according to their nutrient requirements. Indicator species analysis revealed that our dust-treated microcosms were consistently characterized by Raphid-pennate diatoms, as well as by Hyphomonas genus of Alphaproteobacteria and several species of Alteromonas Gammaproteobacteria. Yet, changes in microbial community structure and composition were primarily shaped by the starting conditions of each experiment. These findings indicate that increasing dust deposition events and the weakening of the Mauritanian-Senegalese upwelling system under climate change may result in a more heterotrophic system, particularly in oligotrophic waters, reducing its potential to function as an atmospheric carbon sink. Article in Journal/Newspaper North Atlantic Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 9 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
dust bioassay primary production bacterial production plankton community molecular diversity eastern North Atlantic Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
dust bioassay primary production bacterial production plankton community molecular diversity eastern North Atlantic Science Q General. Including nature conservation geographical distribution QH1-199.5 Clàudia Pérez-Barrancos María D. Gelado-Caballero Nauzet Hernández-Hernández Isabel Baños Markel Gómez-Letona María F. Montero Jesús M. Arrieta Javier Arístegui Uneven response of microbial communities to intense dust deposition across the coastal transition zone off Mauritania |
topic_facet |
dust bioassay primary production bacterial production plankton community molecular diversity eastern North Atlantic Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
The eastern North Atlantic region receives large Saharan dust deposition inputs, providing nutrients and trace metals to the surface waters. We assessed the effects of intense dust deposition on phytoplankton and bacteria cell abundances, metabolic activity, and community structure, along a surface productivity gradient in the Mauritanian-Senegalese upwelling system. Dust concentrations above 4 mg L-1 were added to triplicate microcosms in four bioassay experiments, each lasting three days, increasing nitrate, phosphate and, to a lesser extent, silicate seawater concentrations. Even though dust deposition enhanced both heterotrophic and photosynthetic activity, bacterial production responded faster and stronger than primary production, especially as oligotrophic conditions increased. Bacterial production rates in oligotrophic waters almost tripled one day after the enrichment. However, such favorable response could not be observed on the total organic carbon production until a lag phase of 2 days and whilst under moderate eutrophic conditions. Dust enrichment benefited the presence of certain planktonic groups over others according to their nutrient requirements. Indicator species analysis revealed that our dust-treated microcosms were consistently characterized by Raphid-pennate diatoms, as well as by Hyphomonas genus of Alphaproteobacteria and several species of Alteromonas Gammaproteobacteria. Yet, changes in microbial community structure and composition were primarily shaped by the starting conditions of each experiment. These findings indicate that increasing dust deposition events and the weakening of the Mauritanian-Senegalese upwelling system under climate change may result in a more heterotrophic system, particularly in oligotrophic waters, reducing its potential to function as an atmospheric carbon sink. |
format |
Article in Journal/Newspaper |
author |
Clàudia Pérez-Barrancos María D. Gelado-Caballero Nauzet Hernández-Hernández Isabel Baños Markel Gómez-Letona María F. Montero Jesús M. Arrieta Javier Arístegui |
author_facet |
Clàudia Pérez-Barrancos María D. Gelado-Caballero Nauzet Hernández-Hernández Isabel Baños Markel Gómez-Letona María F. Montero Jesús M. Arrieta Javier Arístegui |
author_sort |
Clàudia Pérez-Barrancos |
title |
Uneven response of microbial communities to intense dust deposition across the coastal transition zone off Mauritania |
title_short |
Uneven response of microbial communities to intense dust deposition across the coastal transition zone off Mauritania |
title_full |
Uneven response of microbial communities to intense dust deposition across the coastal transition zone off Mauritania |
title_fullStr |
Uneven response of microbial communities to intense dust deposition across the coastal transition zone off Mauritania |
title_full_unstemmed |
Uneven response of microbial communities to intense dust deposition across the coastal transition zone off Mauritania |
title_sort |
uneven response of microbial communities to intense dust deposition across the coastal transition zone off mauritania |
publisher |
Frontiers Media S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/fmars.2022.999729 https://doaj.org/article/122d7febf9cf47289b75053b10eee852 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Frontiers in Marine Science, Vol 9 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2022.999729/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2022.999729 https://doaj.org/article/122d7febf9cf47289b75053b10eee852 |
op_doi |
https://doi.org/10.3389/fmars.2022.999729 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
_version_ |
1766129405949640704 |