Response of three krill species to hypoxia and warming: An experimental approach to oxygen minimum zones expansion in coastal ecosystems
To understand the adaptation of euphausiid (krill) species to oxygen minimum zones (OMZ), respiratory response and stress experiments combining hypoxia/reoxygenation exposure with warming were conducted. Experimental krill species were obtained from the Antarctic (South Georgia area), the Humboldt C...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.835292 2023-05-15T13:42:11+02:00 Response of three krill species to hypoxia and warming: An experimental approach to oxygen minimum zones expansion in coastal ecosystems Tremblay, Nelly Abele, Doris MEDIAN LATITUDE: -6.633333 * MEDIAN LONGITUDE: -81.033333 * SOUTH-BOUND LATITUDE: -53.700000 * WEST-BOUND LONGITUDE: -124.700000 * NORTH-BOUND LATITUDE: 44.700000 * EAST-BOUND LONGITUDE: -38.500000 * DATE/TIME START: 2011-08-15T00:00:00 * DATE/TIME END: 2012-04-15T00:00:00 2014-08-26 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.835292 https://doi.org/10.1594/PANGAEA.835292 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.835292 https://doi.org/10.1594/PANGAEA.835292 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Tremblay, Nelly; Abele, Doris (2016): Response of three krill species to hypoxia and warming: an experimental approach to oxygen minimum zones expansion in coastal ecosystems. Marine Ecology, 37(1), 179-199, https://doi.org/10.1111/maec.12258 Dataset 2014 ftpangaea https://doi.org/10.1594/PANGAEA.835292 https://doi.org/10.1111/maec.12258 2023-01-20T07:33:20Z To understand the adaptation of euphausiid (krill) species to oxygen minimum zones (OMZ), respiratory response and stress experiments combining hypoxia/reoxygenation exposure with warming were conducted. Experimental krill species were obtained from the Antarctic (South Georgia area), the Humboldt Current system (HCS, Chilean coast), and the Northern California Current system (NCCS, Oregon). Euphausia mucronata from the HCS shows oxyconforming or oxygen partial pressure (pO2)-dependent respiration below 80% air saturation (18 kPa). Normoxic subsurface oxygenation in winter posed a "high oxygen stress" for this species. The NCCS krill, Euphausia pacifica, and the Antarctic krill, Euphausia superba maintain respiration rates constant down to low critical pO2 values of 6 kPa (30% air saturation) and 11 kPa (55% air saturation), respectively. Antarctic krill had the lowest antioxidant enzyme activities, but the highest concentrations of the molecular antioxidant glutathione (GSH) and was not affected by 6 h exposure to moderate hypoxia. Temperate krill species had higher SOD (superoxide dismutase) values in winter than in summer, which relate to higher winter metabolic rate (E. pacifica). In all species, antioxidant enzyme activities remained constant during hypoxic exposure at habitat temperature. Warming by 7°C above habitat temperature in summer increased SOD activities and GSH levels in E. mucronata (HCS), but no oxidative damage occurred. In winter, when the NCCS is well mixed and the OMZ is deeper, +4°C of warming combined with hypoxia represents a lethal condition for E. pacifica. In summer, when the OMZ expands upwards (100 m subsurface), antioxidant defences counteracted hypoxia and reoxygenation effects in E. pacifica, but only at mildly elevated temperature (+2°C). In this season, experimental warming by +4°C reduced antioxidant activities and the hypoxia combination again caused mortality of exposed specimens. We conclude that a climate change scenario combining warming and hypoxia represents a serious ... Dataset Antarc* Antarctic Antarctic Krill Euphausia superba PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic ENVELOPE(-124.700000,-38.500000,44.700000,-53.700000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
description |
To understand the adaptation of euphausiid (krill) species to oxygen minimum zones (OMZ), respiratory response and stress experiments combining hypoxia/reoxygenation exposure with warming were conducted. Experimental krill species were obtained from the Antarctic (South Georgia area), the Humboldt Current system (HCS, Chilean coast), and the Northern California Current system (NCCS, Oregon). Euphausia mucronata from the HCS shows oxyconforming or oxygen partial pressure (pO2)-dependent respiration below 80% air saturation (18 kPa). Normoxic subsurface oxygenation in winter posed a "high oxygen stress" for this species. The NCCS krill, Euphausia pacifica, and the Antarctic krill, Euphausia superba maintain respiration rates constant down to low critical pO2 values of 6 kPa (30% air saturation) and 11 kPa (55% air saturation), respectively. Antarctic krill had the lowest antioxidant enzyme activities, but the highest concentrations of the molecular antioxidant glutathione (GSH) and was not affected by 6 h exposure to moderate hypoxia. Temperate krill species had higher SOD (superoxide dismutase) values in winter than in summer, which relate to higher winter metabolic rate (E. pacifica). In all species, antioxidant enzyme activities remained constant during hypoxic exposure at habitat temperature. Warming by 7°C above habitat temperature in summer increased SOD activities and GSH levels in E. mucronata (HCS), but no oxidative damage occurred. In winter, when the NCCS is well mixed and the OMZ is deeper, +4°C of warming combined with hypoxia represents a lethal condition for E. pacifica. In summer, when the OMZ expands upwards (100 m subsurface), antioxidant defences counteracted hypoxia and reoxygenation effects in E. pacifica, but only at mildly elevated temperature (+2°C). In this season, experimental warming by +4°C reduced antioxidant activities and the hypoxia combination again caused mortality of exposed specimens. We conclude that a climate change scenario combining warming and hypoxia represents a serious ... |
format |
Dataset |
author |
Tremblay, Nelly Abele, Doris |
spellingShingle |
Tremblay, Nelly Abele, Doris Response of three krill species to hypoxia and warming: An experimental approach to oxygen minimum zones expansion in coastal ecosystems |
author_facet |
Tremblay, Nelly Abele, Doris |
author_sort |
Tremblay, Nelly |
title |
Response of three krill species to hypoxia and warming: An experimental approach to oxygen minimum zones expansion in coastal ecosystems |
title_short |
Response of three krill species to hypoxia and warming: An experimental approach to oxygen minimum zones expansion in coastal ecosystems |
title_full |
Response of three krill species to hypoxia and warming: An experimental approach to oxygen minimum zones expansion in coastal ecosystems |
title_fullStr |
Response of three krill species to hypoxia and warming: An experimental approach to oxygen minimum zones expansion in coastal ecosystems |
title_full_unstemmed |
Response of three krill species to hypoxia and warming: An experimental approach to oxygen minimum zones expansion in coastal ecosystems |
title_sort |
response of three krill species to hypoxia and warming: an experimental approach to oxygen minimum zones expansion in coastal ecosystems |
publisher |
PANGAEA |
publishDate |
2014 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.835292 https://doi.org/10.1594/PANGAEA.835292 |
op_coverage |
MEDIAN LATITUDE: -6.633333 * MEDIAN LONGITUDE: -81.033333 * SOUTH-BOUND LATITUDE: -53.700000 * WEST-BOUND LONGITUDE: -124.700000 * NORTH-BOUND LATITUDE: 44.700000 * EAST-BOUND LONGITUDE: -38.500000 * DATE/TIME START: 2011-08-15T00:00:00 * DATE/TIME END: 2012-04-15T00:00:00 |
long_lat |
ENVELOPE(-124.700000,-38.500000,44.700000,-53.700000) |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba |
op_source |
Supplement to: Tremblay, Nelly; Abele, Doris (2016): Response of three krill species to hypoxia and warming: an experimental approach to oxygen minimum zones expansion in coastal ecosystems. Marine Ecology, 37(1), 179-199, https://doi.org/10.1111/maec.12258 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.835292 https://doi.org/10.1594/PANGAEA.835292 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.835292 https://doi.org/10.1111/maec.12258 |
_version_ |
1766164654744141824 |