Potential interactions between diatoms and bacteria are shaped by trace element gradients in the Southern Ocean
The growth of diatoms in the Southern Ocean, especially the region surrounding the West Antarctic Peninsula, is frequently constrained by low dissolved iron and other trace metal concentrations. This challenge may be overcome by mutualisms between diatoms and co-occurring associated bacteria, in whi...
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ftunivrhodeislan:oai:digitalcommons.uri.edu:gsofacpubs-2536 2024-01-14T10:01:54+01:00 Potential interactions between diatoms and bacteria are shaped by trace element gradients in the Southern Ocean Sterling, Alexa R. Holland, Laura Z. Bundy, Randelle M. Burns, Shannon M. Buck, Kristen N. Chappell, P. Dreux Jenkins, Bethany D. 2022-01-01T08:00:00Z https://digitalcommons.uri.edu/gsofacpubs/1567 https://doi.org/10.3389/fmars.2022.876830 unknown DigitalCommons@URI https://digitalcommons.uri.edu/gsofacpubs/1567 doi:10.3389/fmars.2022.876830 https://doi.org/10.3389/fmars.2022.876830 Graduate School of Oceanography Faculty Publications Antarctic Peninsula diatom-bacteria interactions phytoplankton microbiome Southern Ocean trace metal limitation text 2022 ftunivrhodeislan https://doi.org/10.3389/fmars.2022.876830 2023-12-18T19:10:01Z The growth of diatoms in the Southern Ocean, especially the region surrounding the West Antarctic Peninsula, is frequently constrained by low dissolved iron and other trace metal concentrations. This challenge may be overcome by mutualisms between diatoms and co-occurring associated bacteria, in which diatoms produce organic carbon as a substrate for bacterial growth, and bacteria produce siderophores, metal-binding ligands that can supply diatoms with metals upon uptake as well as other useful secondary compounds for diatom growth like vitamins. To examine the relationships between diatoms and bacteria in the plankton (diatom) size class (> 3 µm), we sampled both bacterial and diatom community composition with accompanying environmental metadata across a naturally occurring concentration gradient of macronutrients, trace metals and siderophores at 21 stations near the West Antarctic Peninsula (WAP). Offshore Drake Passage stations had low dissolved iron (0.33 ± 0.15 nM), while the stations closer to the continental margin had higher dissolved iron (5.05 ± 1.83 nM). A similar geographic pattern was observed for macronutrients and most other trace metals measured, but there was not a clear inshore-offshore gradient in siderophore concentrations. The diatom and bacteria assemblages, determined using 18S and 16S rDNA sequencing respectively, were similar by location sampled, and variance in both assemblages was driven in part by concentrations of soluble reactive phosphorous, dissolved manganese, and dissolved copper, which were all higher near the continent. Some of the most common diatom sequence types observed were Thalassiosira and Fragilariopsis, and bacteria in the plankton size fraction were most commonly Bacteroidetes and Gammaproteobacteria. Network analysis showed positive associations between diatoms and bacteria, indicating possible in situ mutualisms through strategies such as siderophore and vitamin biosynthesis and exchange. This work furthers the understanding of how naturally occurring gradients ... Text Antarc* Antarctic Antarctic Peninsula Drake Passage Southern Ocean University of Rhode Island: DigitalCommons@URI Antarctic Southern Ocean Antarctic Peninsula Drake Passage Frontiers in Marine Science 9 |
institution |
Open Polar |
collection |
University of Rhode Island: DigitalCommons@URI |
op_collection_id |
ftunivrhodeislan |
language |
unknown |
topic |
Antarctic Peninsula diatom-bacteria interactions phytoplankton microbiome Southern Ocean trace metal limitation |
spellingShingle |
Antarctic Peninsula diatom-bacteria interactions phytoplankton microbiome Southern Ocean trace metal limitation Sterling, Alexa R. Holland, Laura Z. Bundy, Randelle M. Burns, Shannon M. Buck, Kristen N. Chappell, P. Dreux Jenkins, Bethany D. Potential interactions between diatoms and bacteria are shaped by trace element gradients in the Southern Ocean |
topic_facet |
Antarctic Peninsula diatom-bacteria interactions phytoplankton microbiome Southern Ocean trace metal limitation |
description |
The growth of diatoms in the Southern Ocean, especially the region surrounding the West Antarctic Peninsula, is frequently constrained by low dissolved iron and other trace metal concentrations. This challenge may be overcome by mutualisms between diatoms and co-occurring associated bacteria, in which diatoms produce organic carbon as a substrate for bacterial growth, and bacteria produce siderophores, metal-binding ligands that can supply diatoms with metals upon uptake as well as other useful secondary compounds for diatom growth like vitamins. To examine the relationships between diatoms and bacteria in the plankton (diatom) size class (> 3 µm), we sampled both bacterial and diatom community composition with accompanying environmental metadata across a naturally occurring concentration gradient of macronutrients, trace metals and siderophores at 21 stations near the West Antarctic Peninsula (WAP). Offshore Drake Passage stations had low dissolved iron (0.33 ± 0.15 nM), while the stations closer to the continental margin had higher dissolved iron (5.05 ± 1.83 nM). A similar geographic pattern was observed for macronutrients and most other trace metals measured, but there was not a clear inshore-offshore gradient in siderophore concentrations. The diatom and bacteria assemblages, determined using 18S and 16S rDNA sequencing respectively, were similar by location sampled, and variance in both assemblages was driven in part by concentrations of soluble reactive phosphorous, dissolved manganese, and dissolved copper, which were all higher near the continent. Some of the most common diatom sequence types observed were Thalassiosira and Fragilariopsis, and bacteria in the plankton size fraction were most commonly Bacteroidetes and Gammaproteobacteria. Network analysis showed positive associations between diatoms and bacteria, indicating possible in situ mutualisms through strategies such as siderophore and vitamin biosynthesis and exchange. This work furthers the understanding of how naturally occurring gradients ... |
format |
Text |
author |
Sterling, Alexa R. Holland, Laura Z. Bundy, Randelle M. Burns, Shannon M. Buck, Kristen N. Chappell, P. Dreux Jenkins, Bethany D. |
author_facet |
Sterling, Alexa R. Holland, Laura Z. Bundy, Randelle M. Burns, Shannon M. Buck, Kristen N. Chappell, P. Dreux Jenkins, Bethany D. |
author_sort |
Sterling, Alexa R. |
title |
Potential interactions between diatoms and bacteria are shaped by trace element gradients in the Southern Ocean |
title_short |
Potential interactions between diatoms and bacteria are shaped by trace element gradients in the Southern Ocean |
title_full |
Potential interactions between diatoms and bacteria are shaped by trace element gradients in the Southern Ocean |
title_fullStr |
Potential interactions between diatoms and bacteria are shaped by trace element gradients in the Southern Ocean |
title_full_unstemmed |
Potential interactions between diatoms and bacteria are shaped by trace element gradients in the Southern Ocean |
title_sort |
potential interactions between diatoms and bacteria are shaped by trace element gradients in the southern ocean |
publisher |
DigitalCommons@URI |
publishDate |
2022 |
url |
https://digitalcommons.uri.edu/gsofacpubs/1567 https://doi.org/10.3389/fmars.2022.876830 |
geographic |
Antarctic Southern Ocean Antarctic Peninsula Drake Passage |
geographic_facet |
Antarctic Southern Ocean Antarctic Peninsula Drake Passage |
genre |
Antarc* Antarctic Antarctic Peninsula Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Drake Passage Southern Ocean |
op_source |
Graduate School of Oceanography Faculty Publications |
op_relation |
https://digitalcommons.uri.edu/gsofacpubs/1567 doi:10.3389/fmars.2022.876830 https://doi.org/10.3389/fmars.2022.876830 |
op_doi |
https://doi.org/10.3389/fmars.2022.876830 |
container_title |
Frontiers in Marine Science |
container_volume |
9 |
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1788056684237684736 |