Diverse inorganic carbon uptake strategies in Antarctic seaweeds: Revealing species-specific responses and implications for Ocean Acidification.
Seaweeds are important components of coastal benthic ecosystems along the Western Antarctic Peninsula (WAP), providing refuge, food, and habitat for numerous associated species. Despite their crucial role, the WAP is among the regions most affected by global climate change, potentially impacting the...
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ftpubmed:38889822 2024-09-15T17:48:08+00:00 Diverse inorganic carbon uptake strategies in Antarctic seaweeds: Revealing species-specific responses and implications for Ocean Acidification. Fernández, Pamela A Amsler, Charles D Hurd, Catriona L Díaz, Patricio A Gaitán-Espitia, Juan Diego Macaya, Erasmo C Schmider-Martínez, Andreas Garrido, Ignacio Murúa, Pedro Buschmann, Alejandro H 2024 Oct 01 https://doi.org/10.1016/j.scitotenv.2024.174006 https://pubmed.ncbi.nlm.nih.gov/38889822 eng eng Elsevier Science https://doi.org/10.1016/j.scitotenv.2024.174006 https://pubmed.ncbi.nlm.nih.gov/38889822 Copyright © 2024 Elsevier B.V. All rights reserved. Sci Total Environ ISSN:1879-1026 Volume:945 Antarctic Carbon concentrating mechanisms Carbon dioxide Carbon uptake strategies Climate change Macroalgae Journal Article 2024 ftpubmed https://doi.org/10.1016/j.scitotenv.2024.174006 2024-07-07T16:01:00Z Seaweeds are important components of coastal benthic ecosystems along the Western Antarctic Peninsula (WAP), providing refuge, food, and habitat for numerous associated species. Despite their crucial role, the WAP is among the regions most affected by global climate change, potentially impacting the ecology and physiology of seaweeds. Elevated atmospheric CO2 concentrations have led to increased dissolved inorganic carbon (Ci) with consequent declines in oceanic pH and alterations in seawater carbonate chemistry, known as Ocean Acidification (OA). Seaweeds possess diverse strategies for Ci uptake, including CO2 concentrating mechanisms (CCMs), which may distinctly respond to changes in Ci concentrations. Conversely, some seaweeds do not operate CCMs (non-CCM species) and rely solely on CO2. Nevertheless, our understanding of the status and functionality of Ci uptake strategies in Antarctic seaweeds remains limited. Here, we investigated the Ci uptake strategies of seaweeds along a depth gradient in the WAP. Carbon isotope signatures (δ13C) and pH drift assays were used as indicators of the presence or absence of CCMs. Our results reveal variability in CCM occurrence among algal phyla and depths ranging from 0 to 20 m. However, this response was species specific. Among red seaweeds, the majority relied solely on CO2 as an exogenous Ci source, with a high percentage of non-CCM species. Green seaweeds exhibited depth-dependent variations in CCM status, with the proportion of non-CCM species increasing at greater depths. Conversely, brown seaweeds exhibited a higher prevalence of CCM species, even in deep waters, indicating the use of CO2 and HCO3-. Our results are similar to those observed in temperate and tropical regions, indicating that the potential impacts of OA on Antarctic seaweeds will be species specific. Additionally, OA may potentially increase the abundance of non-CCM species relative to those with CCMs. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ocean acidification PubMed Central (PMC) Science of The Total Environment 945 174006 |
institution |
Open Polar |
collection |
PubMed Central (PMC) |
op_collection_id |
ftpubmed |
language |
English |
topic |
Antarctic Carbon concentrating mechanisms Carbon dioxide Carbon uptake strategies Climate change Macroalgae |
spellingShingle |
Antarctic Carbon concentrating mechanisms Carbon dioxide Carbon uptake strategies Climate change Macroalgae Fernández, Pamela A Amsler, Charles D Hurd, Catriona L Díaz, Patricio A Gaitán-Espitia, Juan Diego Macaya, Erasmo C Schmider-Martínez, Andreas Garrido, Ignacio Murúa, Pedro Buschmann, Alejandro H Diverse inorganic carbon uptake strategies in Antarctic seaweeds: Revealing species-specific responses and implications for Ocean Acidification. |
topic_facet |
Antarctic Carbon concentrating mechanisms Carbon dioxide Carbon uptake strategies Climate change Macroalgae |
description |
Seaweeds are important components of coastal benthic ecosystems along the Western Antarctic Peninsula (WAP), providing refuge, food, and habitat for numerous associated species. Despite their crucial role, the WAP is among the regions most affected by global climate change, potentially impacting the ecology and physiology of seaweeds. Elevated atmospheric CO2 concentrations have led to increased dissolved inorganic carbon (Ci) with consequent declines in oceanic pH and alterations in seawater carbonate chemistry, known as Ocean Acidification (OA). Seaweeds possess diverse strategies for Ci uptake, including CO2 concentrating mechanisms (CCMs), which may distinctly respond to changes in Ci concentrations. Conversely, some seaweeds do not operate CCMs (non-CCM species) and rely solely on CO2. Nevertheless, our understanding of the status and functionality of Ci uptake strategies in Antarctic seaweeds remains limited. Here, we investigated the Ci uptake strategies of seaweeds along a depth gradient in the WAP. Carbon isotope signatures (δ13C) and pH drift assays were used as indicators of the presence or absence of CCMs. Our results reveal variability in CCM occurrence among algal phyla and depths ranging from 0 to 20 m. However, this response was species specific. Among red seaweeds, the majority relied solely on CO2 as an exogenous Ci source, with a high percentage of non-CCM species. Green seaweeds exhibited depth-dependent variations in CCM status, with the proportion of non-CCM species increasing at greater depths. Conversely, brown seaweeds exhibited a higher prevalence of CCM species, even in deep waters, indicating the use of CO2 and HCO3-. Our results are similar to those observed in temperate and tropical regions, indicating that the potential impacts of OA on Antarctic seaweeds will be species specific. Additionally, OA may potentially increase the abundance of non-CCM species relative to those with CCMs. |
format |
Article in Journal/Newspaper |
author |
Fernández, Pamela A Amsler, Charles D Hurd, Catriona L Díaz, Patricio A Gaitán-Espitia, Juan Diego Macaya, Erasmo C Schmider-Martínez, Andreas Garrido, Ignacio Murúa, Pedro Buschmann, Alejandro H |
author_facet |
Fernández, Pamela A Amsler, Charles D Hurd, Catriona L Díaz, Patricio A Gaitán-Espitia, Juan Diego Macaya, Erasmo C Schmider-Martínez, Andreas Garrido, Ignacio Murúa, Pedro Buschmann, Alejandro H |
author_sort |
Fernández, Pamela A |
title |
Diverse inorganic carbon uptake strategies in Antarctic seaweeds: Revealing species-specific responses and implications for Ocean Acidification. |
title_short |
Diverse inorganic carbon uptake strategies in Antarctic seaweeds: Revealing species-specific responses and implications for Ocean Acidification. |
title_full |
Diverse inorganic carbon uptake strategies in Antarctic seaweeds: Revealing species-specific responses and implications for Ocean Acidification. |
title_fullStr |
Diverse inorganic carbon uptake strategies in Antarctic seaweeds: Revealing species-specific responses and implications for Ocean Acidification. |
title_full_unstemmed |
Diverse inorganic carbon uptake strategies in Antarctic seaweeds: Revealing species-specific responses and implications for Ocean Acidification. |
title_sort |
diverse inorganic carbon uptake strategies in antarctic seaweeds: revealing species-specific responses and implications for ocean acidification. |
publisher |
Elsevier Science |
publishDate |
2024 |
url |
https://doi.org/10.1016/j.scitotenv.2024.174006 https://pubmed.ncbi.nlm.nih.gov/38889822 |
genre |
Antarc* Antarctic Antarctic Peninsula Ocean acidification |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ocean acidification |
op_source |
Sci Total Environ ISSN:1879-1026 Volume:945 |
op_relation |
https://doi.org/10.1016/j.scitotenv.2024.174006 https://pubmed.ncbi.nlm.nih.gov/38889822 |
op_rights |
Copyright © 2024 Elsevier B.V. All rights reserved. |
op_doi |
https://doi.org/10.1016/j.scitotenv.2024.174006 |
container_title |
Science of The Total Environment |
container_volume |
945 |
container_start_page |
174006 |
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1810289287433814016 |