Hypoxia Tolerance of 10 Euphausiid Species in Relation to Vertical Temperature and Oxygen Gradients
Oxygen Minimum Zones prevail in most of the world’s oceans and are particularly extensive in Eastern Boundary Upwelling Ecosystems such as the Humboldt and the Benguela upwelling systems. In these regions, euphausiids are an important trophic link between primary producers and higher trophic levels....
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ftdoajarticles:oai:doaj.org/article:17a4a0d2d0d04591ba3ce8ab4ff21222 2023-05-15T16:08:29+02:00 Hypoxia Tolerance of 10 Euphausiid Species in Relation to Vertical Temperature and Oxygen Gradients Nelly Tremblay Kim Hünerlage Thorsten Werner 2020-03-01T00:00:00Z https://doi.org/10.3389/fphys.2020.00248 https://doaj.org/article/17a4a0d2d0d04591ba3ce8ab4ff21222 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fphys.2020.00248/full https://doaj.org/toc/1664-042X 1664-042X doi:10.3389/fphys.2020.00248 https://doaj.org/article/17a4a0d2d0d04591ba3ce8ab4ff21222 Frontiers in Physiology, Vol 11 (2020) oxygen minimum zones diel vertical migration krill respiration rate regulation index Physiology QP1-981 article 2020 ftdoajarticles https://doi.org/10.3389/fphys.2020.00248 2022-12-31T00:20:17Z Oxygen Minimum Zones prevail in most of the world’s oceans and are particularly extensive in Eastern Boundary Upwelling Ecosystems such as the Humboldt and the Benguela upwelling systems. In these regions, euphausiids are an important trophic link between primary producers and higher trophic levels. The species are known as pronounced diel vertical migrators, thus facing different levels of oxygen and temperature within a 24 h cycle. Declining oxygen levels may lead to vertically constrained habitats in euphausiids, which consequently will affect several trophic levels in the food web of the respective ecosystem. By using the regulation index (RI), the present study aimed at investigating the hypoxia tolerances of different euphausiid species from Atlantic, Pacific as well as from Polar regions. RI was calculated from 141 data sets and used to differentiate between respiration strategies using median and quartile (Q) values: low degree of oxyregulation (0.25 < RI median < 0.5); high degree of oxyregulation (0.5 < RI median < 1; Q1 > 0.25 or Q3 > 0.75); and metabolic suppression (RI median, Q1 and Q3 < 0). RI values of the polar (Euphausia superba, Thysanoessa inermis) and sub-tropical (Euphausia hanseni, Nyctiphanes capensis, and Nematoscelis megalops) species indicate a high degree of oxyregulation, whereas almost perfect oxyconformity (RI median ≈ 0; Q1 < 0 and Q3 > 0) was identified for the neritic temperate species Thysanoessa spinifera and the tropical species Euphausia lamelligera. RI values of Euphausia distinguenda and the Humboldt species Euphausia mucronata qualified these as metabolic suppressors. RI showed a significant impact of temperature on the respiration strategy of E. hanseni from oxyregulation to metabolic suppression. The species’ estimated hypoxia tolerances and the degree of oxyconformity vs. oxyregulation were linked to diel vertical migration behavior and the temperature experienced during migration. The results highlight that the euphausiid species ... Article in Journal/Newspaper Euphausia superba Thysanoessa inermis Directory of Open Access Journals: DOAJ Articles Pacific Frontiers in Physiology 11 |
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ftdoajarticles |
language |
English |
topic |
oxygen minimum zones diel vertical migration krill respiration rate regulation index Physiology QP1-981 |
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oxygen minimum zones diel vertical migration krill respiration rate regulation index Physiology QP1-981 Nelly Tremblay Kim Hünerlage Thorsten Werner Hypoxia Tolerance of 10 Euphausiid Species in Relation to Vertical Temperature and Oxygen Gradients |
topic_facet |
oxygen minimum zones diel vertical migration krill respiration rate regulation index Physiology QP1-981 |
description |
Oxygen Minimum Zones prevail in most of the world’s oceans and are particularly extensive in Eastern Boundary Upwelling Ecosystems such as the Humboldt and the Benguela upwelling systems. In these regions, euphausiids are an important trophic link between primary producers and higher trophic levels. The species are known as pronounced diel vertical migrators, thus facing different levels of oxygen and temperature within a 24 h cycle. Declining oxygen levels may lead to vertically constrained habitats in euphausiids, which consequently will affect several trophic levels in the food web of the respective ecosystem. By using the regulation index (RI), the present study aimed at investigating the hypoxia tolerances of different euphausiid species from Atlantic, Pacific as well as from Polar regions. RI was calculated from 141 data sets and used to differentiate between respiration strategies using median and quartile (Q) values: low degree of oxyregulation (0.25 < RI median < 0.5); high degree of oxyregulation (0.5 < RI median < 1; Q1 > 0.25 or Q3 > 0.75); and metabolic suppression (RI median, Q1 and Q3 < 0). RI values of the polar (Euphausia superba, Thysanoessa inermis) and sub-tropical (Euphausia hanseni, Nyctiphanes capensis, and Nematoscelis megalops) species indicate a high degree of oxyregulation, whereas almost perfect oxyconformity (RI median ≈ 0; Q1 < 0 and Q3 > 0) was identified for the neritic temperate species Thysanoessa spinifera and the tropical species Euphausia lamelligera. RI values of Euphausia distinguenda and the Humboldt species Euphausia mucronata qualified these as metabolic suppressors. RI showed a significant impact of temperature on the respiration strategy of E. hanseni from oxyregulation to metabolic suppression. The species’ estimated hypoxia tolerances and the degree of oxyconformity vs. oxyregulation were linked to diel vertical migration behavior and the temperature experienced during migration. The results highlight that the euphausiid species ... |
format |
Article in Journal/Newspaper |
author |
Nelly Tremblay Kim Hünerlage Thorsten Werner |
author_facet |
Nelly Tremblay Kim Hünerlage Thorsten Werner |
author_sort |
Nelly Tremblay |
title |
Hypoxia Tolerance of 10 Euphausiid Species in Relation to Vertical Temperature and Oxygen Gradients |
title_short |
Hypoxia Tolerance of 10 Euphausiid Species in Relation to Vertical Temperature and Oxygen Gradients |
title_full |
Hypoxia Tolerance of 10 Euphausiid Species in Relation to Vertical Temperature and Oxygen Gradients |
title_fullStr |
Hypoxia Tolerance of 10 Euphausiid Species in Relation to Vertical Temperature and Oxygen Gradients |
title_full_unstemmed |
Hypoxia Tolerance of 10 Euphausiid Species in Relation to Vertical Temperature and Oxygen Gradients |
title_sort |
hypoxia tolerance of 10 euphausiid species in relation to vertical temperature and oxygen gradients |
publisher |
Frontiers Media S.A. |
publishDate |
2020 |
url |
https://doi.org/10.3389/fphys.2020.00248 https://doaj.org/article/17a4a0d2d0d04591ba3ce8ab4ff21222 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Euphausia superba Thysanoessa inermis |
genre_facet |
Euphausia superba Thysanoessa inermis |
op_source |
Frontiers in Physiology, Vol 11 (2020) |
op_relation |
https://www.frontiersin.org/article/10.3389/fphys.2020.00248/full https://doaj.org/toc/1664-042X 1664-042X doi:10.3389/fphys.2020.00248 https://doaj.org/article/17a4a0d2d0d04591ba3ce8ab4ff21222 |
op_doi |
https://doi.org/10.3389/fphys.2020.00248 |
container_title |
Frontiers in Physiology |
container_volume |
11 |
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1766404531290112000 |