A molecular perspective on the invasibility of the southern ocean benthos: The impact of hypoxia and temperature on gene expression in South American and Antarctic Aequiyoldia bivalves
When an organism makes a long-distance transition to a new habitat, the associated environmental change is often marked and requires physiological plasticity of larvae, juveniles, or other migrant stages. Exposing shallow-water marine bivalves ( Aequiyoldia cf. eightsii ) from southern South America...
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Online Access: | http://dx.doi.org/10.3389/fphys.2023.1083240 https://www.frontiersin.org/articles/10.3389/fphys.2023.1083240/full |
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crfrontiers:10.3389/fphys.2023.1083240 2024-02-11T09:56:11+01:00 A molecular perspective on the invasibility of the southern ocean benthos: The impact of hypoxia and temperature on gene expression in South American and Antarctic Aequiyoldia bivalves Martínez, Mariano González-Aravena, Marcelo Held, Christoph Abele, Doris Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research Deutscher Akademischer Austauschdienst Agencia Nacional de Investigación e Innovación 2023 http://dx.doi.org/10.3389/fphys.2023.1083240 https://www.frontiersin.org/articles/10.3389/fphys.2023.1083240/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Physiology volume 14 ISSN 1664-042X Physiology (medical) Physiology journal-article 2023 crfrontiers https://doi.org/10.3389/fphys.2023.1083240 2024-01-26T10:00:56Z When an organism makes a long-distance transition to a new habitat, the associated environmental change is often marked and requires physiological plasticity of larvae, juveniles, or other migrant stages. Exposing shallow-water marine bivalves ( Aequiyoldia cf. eightsii ) from southern South America (SSA) and the West Antarctic Peninsula (WAP) to changes in temperature and oxygen availability, we investigated changes in gene expression in a simulated colonization experiment of the shores of a new continent after crossing of the Drake Passage, and in a warming scenario in the WAP. Bivalves from SSA were cooled from 7°C ( in situ ) to 4°C and 2°C (future warmed WAP conditions), WAP bivalves were warmed from 1.5°C (current summer in situ ) to 4°C (warmed WAP), gene expression patterns in response to thermal stress by itself and in combination with hypoxia were measured after 10 days. Our results confirm that molecular plasticity may play a vital role for local adaptation. Hypoxia had a greater effect on the transcriptome than temperature alone. The effect was further amplified when hypoxia and temperature acted as combined stressors. The WAP bivalves showed a remarkable ability to cope with short-term exposure to hypoxia by switching to a metabolic rate depression strategy and activating the alternative oxidation pathway, whilst the SSA population showed no comparable response. In SSA, the high prevalence of apoptosis-related differentially expressed genes especially under combined higher temperatures and hypoxia indicated that the SSA Aequiyoldia are operating near their physiological limits already. While the effect of temperature per se may not represent the single most effective barrier to Antarctic colonization by South American bivalves, the current distribution patterns as well as their resilience to future conditions can be better understood by looking at the synergistic effects of temperature in conjunction with short-term exposure to hypoxia. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Drake Passage Southern Ocean Frontiers (Publisher) Antarctic Antarctic Peninsula Drake Passage Southern Ocean Frontiers in Physiology 14 |
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Physiology (medical) Physiology |
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Physiology (medical) Physiology Martínez, Mariano González-Aravena, Marcelo Held, Christoph Abele, Doris A molecular perspective on the invasibility of the southern ocean benthos: The impact of hypoxia and temperature on gene expression in South American and Antarctic Aequiyoldia bivalves |
topic_facet |
Physiology (medical) Physiology |
description |
When an organism makes a long-distance transition to a new habitat, the associated environmental change is often marked and requires physiological plasticity of larvae, juveniles, or other migrant stages. Exposing shallow-water marine bivalves ( Aequiyoldia cf. eightsii ) from southern South America (SSA) and the West Antarctic Peninsula (WAP) to changes in temperature and oxygen availability, we investigated changes in gene expression in a simulated colonization experiment of the shores of a new continent after crossing of the Drake Passage, and in a warming scenario in the WAP. Bivalves from SSA were cooled from 7°C ( in situ ) to 4°C and 2°C (future warmed WAP conditions), WAP bivalves were warmed from 1.5°C (current summer in situ ) to 4°C (warmed WAP), gene expression patterns in response to thermal stress by itself and in combination with hypoxia were measured after 10 days. Our results confirm that molecular plasticity may play a vital role for local adaptation. Hypoxia had a greater effect on the transcriptome than temperature alone. The effect was further amplified when hypoxia and temperature acted as combined stressors. The WAP bivalves showed a remarkable ability to cope with short-term exposure to hypoxia by switching to a metabolic rate depression strategy and activating the alternative oxidation pathway, whilst the SSA population showed no comparable response. In SSA, the high prevalence of apoptosis-related differentially expressed genes especially under combined higher temperatures and hypoxia indicated that the SSA Aequiyoldia are operating near their physiological limits already. While the effect of temperature per se may not represent the single most effective barrier to Antarctic colonization by South American bivalves, the current distribution patterns as well as their resilience to future conditions can be better understood by looking at the synergistic effects of temperature in conjunction with short-term exposure to hypoxia. |
author2 |
Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research Deutscher Akademischer Austauschdienst Agencia Nacional de Investigación e Innovación |
format |
Article in Journal/Newspaper |
author |
Martínez, Mariano González-Aravena, Marcelo Held, Christoph Abele, Doris |
author_facet |
Martínez, Mariano González-Aravena, Marcelo Held, Christoph Abele, Doris |
author_sort |
Martínez, Mariano |
title |
A molecular perspective on the invasibility of the southern ocean benthos: The impact of hypoxia and temperature on gene expression in South American and Antarctic Aequiyoldia bivalves |
title_short |
A molecular perspective on the invasibility of the southern ocean benthos: The impact of hypoxia and temperature on gene expression in South American and Antarctic Aequiyoldia bivalves |
title_full |
A molecular perspective on the invasibility of the southern ocean benthos: The impact of hypoxia and temperature on gene expression in South American and Antarctic Aequiyoldia bivalves |
title_fullStr |
A molecular perspective on the invasibility of the southern ocean benthos: The impact of hypoxia and temperature on gene expression in South American and Antarctic Aequiyoldia bivalves |
title_full_unstemmed |
A molecular perspective on the invasibility of the southern ocean benthos: The impact of hypoxia and temperature on gene expression in South American and Antarctic Aequiyoldia bivalves |
title_sort |
molecular perspective on the invasibility of the southern ocean benthos: the impact of hypoxia and temperature on gene expression in south american and antarctic aequiyoldia bivalves |
publisher |
Frontiers Media SA |
publishDate |
2023 |
url |
http://dx.doi.org/10.3389/fphys.2023.1083240 https://www.frontiersin.org/articles/10.3389/fphys.2023.1083240/full |
geographic |
Antarctic Antarctic Peninsula Drake Passage Southern Ocean |
geographic_facet |
Antarctic Antarctic Peninsula Drake Passage Southern Ocean |
genre |
Antarc* Antarctic Antarctic Peninsula Drake Passage Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Drake Passage Southern Ocean |
op_source |
Frontiers in Physiology volume 14 ISSN 1664-042X |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/fphys.2023.1083240 |
container_title |
Frontiers in Physiology |
container_volume |
14 |
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1790601248342278144 |