The amphipod Themisto gaudichaudii is poised to move poleward: which are the consequences for the pelagic ecosystem of the warming Southern Ocean? In: Polar Regions, Climate Change and Society, 28th International Polar Conference, Potsdam, 01 – 05 May 2022.
The Southern Ocean, in particular the southwest Atlantic sector, is experiencing rapid environmental changes. A long-term trend of density changes of key pelagic species has been noted over the last decades: Antarctic krill populations are declining whilst salps are on the rise and shifting their di...
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Format: | Book |
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Berichte zur Polar- und Meeresforschung = Reports on polar and marine research
2022
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Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/56361/ https://hdl.handle.net/10013/epic.a36e681b-bebc-4dfe-9c52-b6c6220ce0a0 |
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ftawi:oai:epic.awi.de:56361 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The Southern Ocean, in particular the southwest Atlantic sector, is experiencing rapid environmental changes. A long-term trend of density changes of key pelagic species has been noted over the last decades: Antarctic krill populations are declining whilst salps are on the rise and shifting their distribution poleward. A similar poleward expansion is anticipated for a third key player, the hyperiid amphipod crustacean Themisto gaudichaudii, leading to an increasing overlap of the distributions of these three species. Due to major knowledge gaps in the ecology, and genetic connectivity of T. gaudichaudii, the likelihood of this shift and its consequences for the pelagic food web structure remain largely unexplored. In this context, Themisto’s genetic and trophic connectivity as well as thermal response were investigated with state-of-the-art molecular methods. Phylogeographic analyses showed genetic homogeneity between localities in the Southern Ocean and Atlantic waters combined with high degree of phenotypic plasticity enabling different lineages to thrive in regions further south. Diet analyses using DNA metabarcoding were applied to characterize regional variation in diet. These analyses showed a diet predominantly composed of krill, in particular in the Antarctic Peninsula region, showing that Themisto’s poleward range expansion can further impact the already declining krill stocks. It also unexpectedly revealed ctenophores to be an important prey, despite their reputation as “trophic dead-end”. Transcriptome analyses were used to study the thermal response of Themisto individuals from different geographic populations that were experimentally exposed to heat and cold treatments. The analysis of differentially expressed genes showed that genetic lineages differ in thermal tolerances. It also revealed a wide range of molecular mechanisms in Themisto amphipods to cope with thermal stress. These findings contribute to better predict the impact of climate-driven range shifts on the pelagic ecosystems in the ... |
author2 |
Kassens, Heidemarie Damaske, Detlef Diekmann, Bernhard Flisker, Frank Heinemann, Günther Herrle, Jens O. Karsten, Ulf Koglin, Nikola Kruse, Frigga Lehmann, Rainer Lüdecke, Cornelia Mayer, Christoph Sattler, Birgit Scheinert, Mirko Spiegel-Behnke, Cornelia Tiedemann, Ralf |
format |
Book |
author |
Havermans, Charlotte Martinez-Alarcon, Diana Praebel, Kim Wangensteen, Owen Auel, Holger Hagen, Wilhelm Held, Christoph |
spellingShingle |
Havermans, Charlotte Martinez-Alarcon, Diana Praebel, Kim Wangensteen, Owen Auel, Holger Hagen, Wilhelm Held, Christoph The amphipod Themisto gaudichaudii is poised to move poleward: which are the consequences for the pelagic ecosystem of the warming Southern Ocean? In: Polar Regions, Climate Change and Society, 28th International Polar Conference, Potsdam, 01 – 05 May 2022. |
author_facet |
Havermans, Charlotte Martinez-Alarcon, Diana Praebel, Kim Wangensteen, Owen Auel, Holger Hagen, Wilhelm Held, Christoph |
author_sort |
Havermans, Charlotte |
title |
The amphipod Themisto gaudichaudii is poised to move poleward: which are the consequences for the pelagic ecosystem of the warming Southern Ocean? In: Polar Regions, Climate Change and Society, 28th International Polar Conference, Potsdam, 01 – 05 May 2022. |
title_short |
The amphipod Themisto gaudichaudii is poised to move poleward: which are the consequences for the pelagic ecosystem of the warming Southern Ocean? In: Polar Regions, Climate Change and Society, 28th International Polar Conference, Potsdam, 01 – 05 May 2022. |
title_full |
The amphipod Themisto gaudichaudii is poised to move poleward: which are the consequences for the pelagic ecosystem of the warming Southern Ocean? In: Polar Regions, Climate Change and Society, 28th International Polar Conference, Potsdam, 01 – 05 May 2022. |
title_fullStr |
The amphipod Themisto gaudichaudii is poised to move poleward: which are the consequences for the pelagic ecosystem of the warming Southern Ocean? In: Polar Regions, Climate Change and Society, 28th International Polar Conference, Potsdam, 01 – 05 May 2022. |
title_full_unstemmed |
The amphipod Themisto gaudichaudii is poised to move poleward: which are the consequences for the pelagic ecosystem of the warming Southern Ocean? In: Polar Regions, Climate Change and Society, 28th International Polar Conference, Potsdam, 01 – 05 May 2022. |
title_sort |
amphipod themisto gaudichaudii is poised to move poleward: which are the consequences for the pelagic ecosystem of the warming southern ocean? in: polar regions, climate change and society, 28th international polar conference, potsdam, 01 – 05 may 2022. |
publisher |
Berichte zur Polar- und Meeresforschung = Reports on polar and marine research |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/56361/ https://hdl.handle.net/10013/epic.a36e681b-bebc-4dfe-9c52-b6c6220ce0a0 |
geographic |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Southern Ocean The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Berichte zur Polar- und Meeresforschung Reports on Polar and Marine Research Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctic Peninsula Berichte zur Polar- und Meeresforschung Reports on Polar and Marine Research Southern Ocean |
op_source |
EPIC3Bremerhaven, Berichte zur Polar- und Meeresforschung = Reports on polar and marine research, 158 p. |
op_relation |
Havermans, C. orcid:0000-0002-1126-4074 , Martinez-Alarcon, D. orcid:0000-0001-9918-2526 , Praebel, K. orcid:0000-0002-0681-1854 , Wangensteen, O. orcid:0000-0001-5593-348X , Auel, H. , Hagen, W. orcid:0000-0002-7462-9931 and Held, C. orcid:0000-0001-8854-3234 (2022) The amphipod Themisto gaudichaudii is poised to move poleward: which are the consequences for the pelagic ecosystem of the warming Southern Ocean? In: Polar Regions, Climate Change and Society, 28th International Polar Conference, Potsdam, 01 – 05 May 2022. / H. Kassens , D. Damaske , B. Diekmann orcid:0000-0001-5129-3649 , F. Flisker , G. Heinemann , J. Herrle , U. Karsten , N. Koglin , F. Kruse , R. Lehmann , C. Lüdecke , C. Mayer , B. Sattler , M. Scheinert , C. Spiegel-Behnke and R. Tiedemann orcid:0000-0001-7211-8049 (editors) , Bremerhaven, Berichte zur Polar- und Meeresforschung = Reports on polar and marine research, 158 p. . doi:10.57738/BzPM_0762_2022 <https://doi.org/10.57738/BzPM_0762_2022> , hdl:10013/epic.a36e681b-bebc-4dfe-9c52-b6c6220ce0a0 |
_version_ |
1766223181249511424 |
spelling |
ftawi:oai:epic.awi.de:56361 2023-05-15T13:45:22+02:00 The amphipod Themisto gaudichaudii is poised to move poleward: which are the consequences for the pelagic ecosystem of the warming Southern Ocean? In: Polar Regions, Climate Change and Society, 28th International Polar Conference, Potsdam, 01 – 05 May 2022. Havermans, Charlotte Martinez-Alarcon, Diana Praebel, Kim Wangensteen, Owen Auel, Holger Hagen, Wilhelm Held, Christoph Kassens, Heidemarie Damaske, Detlef Diekmann, Bernhard Flisker, Frank Heinemann, Günther Herrle, Jens O. Karsten, Ulf Koglin, Nikola Kruse, Frigga Lehmann, Rainer Lüdecke, Cornelia Mayer, Christoph Sattler, Birgit Scheinert, Mirko Spiegel-Behnke, Cornelia Tiedemann, Ralf 2022-05-01 https://epic.awi.de/id/eprint/56361/ https://hdl.handle.net/10013/epic.a36e681b-bebc-4dfe-9c52-b6c6220ce0a0 unknown Berichte zur Polar- und Meeresforschung = Reports on polar and marine research Havermans, C. orcid:0000-0002-1126-4074 , Martinez-Alarcon, D. orcid:0000-0001-9918-2526 , Praebel, K. orcid:0000-0002-0681-1854 , Wangensteen, O. orcid:0000-0001-5593-348X , Auel, H. , Hagen, W. orcid:0000-0002-7462-9931 and Held, C. orcid:0000-0001-8854-3234 (2022) The amphipod Themisto gaudichaudii is poised to move poleward: which are the consequences for the pelagic ecosystem of the warming Southern Ocean? In: Polar Regions, Climate Change and Society, 28th International Polar Conference, Potsdam, 01 – 05 May 2022. / H. Kassens , D. Damaske , B. Diekmann orcid:0000-0001-5129-3649 , F. Flisker , G. Heinemann , J. Herrle , U. Karsten , N. Koglin , F. Kruse , R. Lehmann , C. Lüdecke , C. Mayer , B. Sattler , M. Scheinert , C. Spiegel-Behnke and R. Tiedemann orcid:0000-0001-7211-8049 (editors) , Bremerhaven, Berichte zur Polar- und Meeresforschung = Reports on polar and marine research, 158 p. . doi:10.57738/BzPM_0762_2022 <https://doi.org/10.57738/BzPM_0762_2022> , hdl:10013/epic.a36e681b-bebc-4dfe-9c52-b6c6220ce0a0 EPIC3Bremerhaven, Berichte zur Polar- und Meeresforschung = Reports on polar and marine research, 158 p. Book peerRev 2022 ftawi 2022-10-09T23:12:45Z The Southern Ocean, in particular the southwest Atlantic sector, is experiencing rapid environmental changes. A long-term trend of density changes of key pelagic species has been noted over the last decades: Antarctic krill populations are declining whilst salps are on the rise and shifting their distribution poleward. A similar poleward expansion is anticipated for a third key player, the hyperiid amphipod crustacean Themisto gaudichaudii, leading to an increasing overlap of the distributions of these three species. Due to major knowledge gaps in the ecology, and genetic connectivity of T. gaudichaudii, the likelihood of this shift and its consequences for the pelagic food web structure remain largely unexplored. In this context, Themisto’s genetic and trophic connectivity as well as thermal response were investigated with state-of-the-art molecular methods. Phylogeographic analyses showed genetic homogeneity between localities in the Southern Ocean and Atlantic waters combined with high degree of phenotypic plasticity enabling different lineages to thrive in regions further south. Diet analyses using DNA metabarcoding were applied to characterize regional variation in diet. These analyses showed a diet predominantly composed of krill, in particular in the Antarctic Peninsula region, showing that Themisto’s poleward range expansion can further impact the already declining krill stocks. It also unexpectedly revealed ctenophores to be an important prey, despite their reputation as “trophic dead-end”. Transcriptome analyses were used to study the thermal response of Themisto individuals from different geographic populations that were experimentally exposed to heat and cold treatments. The analysis of differentially expressed genes showed that genetic lineages differ in thermal tolerances. It also revealed a wide range of molecular mechanisms in Themisto amphipods to cope with thermal stress. These findings contribute to better predict the impact of climate-driven range shifts on the pelagic ecosystems in the ... Book Antarc* Antarctic Antarctic Krill Antarctic Peninsula Berichte zur Polar- und Meeresforschung Reports on Polar and Marine Research Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Southern Ocean The Antarctic Antarctic Peninsula |