Uptake of dissolved inorganic nitrogen and N2 fixation by Crocosphaera watsonii under climate change scenarios
The response of N2 fixation to projected future conditions in the ocean cannot be reliably predicted to date. We conducted a minicosm experiment with pre-acclimated cultures of the globally significant diazotroph Crocosphaera watsonii strain WH8501 (“Crocosphaera”). PH and temperature were altered s...
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ftdoajarticles:oai:doaj.org/article:61e5a13bcbb8411495e499209a07e3cf 2024-09-15T18:28:15+00:00 Uptake of dissolved inorganic nitrogen and N2 fixation by Crocosphaera watsonii under climate change scenarios Jacqueline Umbricht Alba Filella Angelina Klett Angela Vogts Mar Benavides Maren Voss 2024-06-01T00:00:00Z https://doi.org/10.3389/fmars.2024.1388214 https://doaj.org/article/61e5a13bcbb8411495e499209a07e3cf EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fmars.2024.1388214/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2024.1388214 https://doaj.org/article/61e5a13bcbb8411495e499209a07e3cf Frontiers in Marine Science, Vol 11 (2024) nitrogen fixation ocean warming ocean acidification nitrogen assimilation Crocosphaera minicosm experiment Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2024 ftdoajarticles https://doi.org/10.3389/fmars.2024.1388214 2024-08-05T17:49:07Z The response of N2 fixation to projected future conditions in the ocean cannot be reliably predicted to date. We conducted a minicosm experiment with pre-acclimated cultures of the globally significant diazotroph Crocosphaera watsonii strain WH8501 (“Crocosphaera”). PH and temperature were altered simultaneously to match the RCP scenarios 4.5 and 6 and investigate a more realistic future scenario compared to studies that focus on changes of a single stressor only. The cell abundance and nitrogen metabolism of Crocosphaera was monitored over 5 days. Our results imply that Crocosphaera is able to simultaneously perform N2 fixation and assimilate dissolved inorganic nitrogen (DIN, i.e., nitrate and ammonium) under all the conditions tested and implies a competition with non-diazotrophic phytoplankton for DIN, which should be further investigated. Using NanoSIMS analysis of single cells, our results point towards a preference for DIN assimilation over N2 fixation under more acidic and warmer conditions. Overall, our results show that while the combined alteration of pH and temperature had a negative effect on the diazotroph’s growth and N2 fixation, Crocosphaera is likely to cope well with conditions in the future ocean. The high intra-population variability in nitrogen assimilation pathways may give this species the flexibility to quickly react to environmental changes. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Frontiers in Marine Science 11 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
nitrogen fixation ocean warming ocean acidification nitrogen assimilation Crocosphaera minicosm experiment Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
nitrogen fixation ocean warming ocean acidification nitrogen assimilation Crocosphaera minicosm experiment Science Q General. Including nature conservation geographical distribution QH1-199.5 Jacqueline Umbricht Alba Filella Angelina Klett Angela Vogts Mar Benavides Maren Voss Uptake of dissolved inorganic nitrogen and N2 fixation by Crocosphaera watsonii under climate change scenarios |
topic_facet |
nitrogen fixation ocean warming ocean acidification nitrogen assimilation Crocosphaera minicosm experiment Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
The response of N2 fixation to projected future conditions in the ocean cannot be reliably predicted to date. We conducted a minicosm experiment with pre-acclimated cultures of the globally significant diazotroph Crocosphaera watsonii strain WH8501 (“Crocosphaera”). PH and temperature were altered simultaneously to match the RCP scenarios 4.5 and 6 and investigate a more realistic future scenario compared to studies that focus on changes of a single stressor only. The cell abundance and nitrogen metabolism of Crocosphaera was monitored over 5 days. Our results imply that Crocosphaera is able to simultaneously perform N2 fixation and assimilate dissolved inorganic nitrogen (DIN, i.e., nitrate and ammonium) under all the conditions tested and implies a competition with non-diazotrophic phytoplankton for DIN, which should be further investigated. Using NanoSIMS analysis of single cells, our results point towards a preference for DIN assimilation over N2 fixation under more acidic and warmer conditions. Overall, our results show that while the combined alteration of pH and temperature had a negative effect on the diazotroph’s growth and N2 fixation, Crocosphaera is likely to cope well with conditions in the future ocean. The high intra-population variability in nitrogen assimilation pathways may give this species the flexibility to quickly react to environmental changes. |
format |
Article in Journal/Newspaper |
author |
Jacqueline Umbricht Alba Filella Angelina Klett Angela Vogts Mar Benavides Maren Voss |
author_facet |
Jacqueline Umbricht Alba Filella Angelina Klett Angela Vogts Mar Benavides Maren Voss |
author_sort |
Jacqueline Umbricht |
title |
Uptake of dissolved inorganic nitrogen and N2 fixation by Crocosphaera watsonii under climate change scenarios |
title_short |
Uptake of dissolved inorganic nitrogen and N2 fixation by Crocosphaera watsonii under climate change scenarios |
title_full |
Uptake of dissolved inorganic nitrogen and N2 fixation by Crocosphaera watsonii under climate change scenarios |
title_fullStr |
Uptake of dissolved inorganic nitrogen and N2 fixation by Crocosphaera watsonii under climate change scenarios |
title_full_unstemmed |
Uptake of dissolved inorganic nitrogen and N2 fixation by Crocosphaera watsonii under climate change scenarios |
title_sort |
uptake of dissolved inorganic nitrogen and n2 fixation by crocosphaera watsonii under climate change scenarios |
publisher |
Frontiers Media S.A. |
publishDate |
2024 |
url |
https://doi.org/10.3389/fmars.2024.1388214 https://doaj.org/article/61e5a13bcbb8411495e499209a07e3cf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Frontiers in Marine Science, Vol 11 (2024) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fmars.2024.1388214/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2024.1388214 https://doaj.org/article/61e5a13bcbb8411495e499209a07e3cf |
op_doi |
https://doi.org/10.3389/fmars.2024.1388214 |
container_title |
Frontiers in Marine Science |
container_volume |
11 |
_version_ |
1810469584734519296 |