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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ftdoajarticles:oai:doaj.org/article:2e76517c3e8e4b6bb613ccf841e764f4 2023-05-15T13:54:28+02:00 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 Mariano Martínez Marcelo González-Aravena Christoph Held Doris Abele 2023-02-01T00:00:00Z https://doi.org/10.3389/fphys.2023.1083240 https://doaj.org/article/2e76517c3e8e4b6bb613ccf841e764f4 EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/fphys.2023.1083240/full https://doaj.org/toc/1664-042X 1664-042X doi:10.3389/fphys.2023.1083240 https://doaj.org/article/2e76517c3e8e4b6bb613ccf841e764f4 Frontiers in Physiology, Vol 14 (2023) warming non-indigenous species alternative oxidase west antarctic peninsula drake passage Physiology QP1-981 article 2023 ftdoajarticles https://doi.org/10.3389/fphys.2023.1083240 2023-02-26T01:39:29Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean Antarctic Peninsula Drake Passage Frontiers in Physiology 14 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
warming non-indigenous species alternative oxidase west antarctic peninsula drake passage Physiology QP1-981 |
spellingShingle |
warming non-indigenous species alternative oxidase west antarctic peninsula drake passage Physiology QP1-981 Mariano Martínez Marcelo González-Aravena Christoph Held Doris Abele 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 |
warming non-indigenous species alternative oxidase west antarctic peninsula drake passage Physiology QP1-981 |
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. |
format |
Article in Journal/Newspaper |
author |
Mariano Martínez Marcelo González-Aravena Christoph Held Doris Abele |
author_facet |
Mariano Martínez Marcelo González-Aravena Christoph Held Doris Abele |
author_sort |
Mariano Martínez |
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 S.A. |
publishDate |
2023 |
url |
https://doi.org/10.3389/fphys.2023.1083240 https://doaj.org/article/2e76517c3e8e4b6bb613ccf841e764f4 |
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 |
Frontiers in Physiology, Vol 14 (2023) |
op_relation |
https://www.frontiersin.org/articles/10.3389/fphys.2023.1083240/full https://doaj.org/toc/1664-042X 1664-042X doi:10.3389/fphys.2023.1083240 https://doaj.org/article/2e76517c3e8e4b6bb613ccf841e764f4 |
op_doi |
https://doi.org/10.3389/fphys.2023.1083240 |
container_title |
Frontiers in Physiology |
container_volume |
14 |
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1766260406677929984 |