Arctic vs sub-Arctic pelagic amphipods in the face of climate change: Insights into the genetic connectivity and diet spectrum of Themisto libellula and T. abyssorum. In: POLAR REGIONS, CLIMATE CHANGE AND SOCIETY, 28TH INTERNATIONAL POLAR CONFERENCE, POTSDAM, 01 – 05 MAY 2022.
Rapid warming in the Arctic is drastically impacting marine ecosystems, affecting pelagic communities and food web structure. Themisto amphipods are dominant in the Arctic zooplankton community and represent a key link between secondary producers and higher trophic levels. In the Arctic seas, two co...
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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/56367/ https://hdl.handle.net/10013/epic.037fecb6-c6f9-4eb4-a799-067adc51658f |
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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 |
Rapid warming in the Arctic is drastically impacting marine ecosystems, affecting pelagic communities and food web structure. Themisto amphipods are dominant in the Arctic zooplankton community and represent a key link between secondary producers and higher trophic levels. In the Arctic seas, two coexisting species are found in high biomass: Themisto libellula, considered a true Arctic species and Themisto abyssorum, a sub-Arctic, boreal species. Many aspects of the ecology and genetic structure of these two species are not well studied, despite their importance in the food web. First, we tested both species for levels of genetic diversity and then assessed their diet spectrum with molecular methods, with a regional focus on the Greenland shelf, Fram Strait and Svalbard. Spatial genetic structure was evaluated using the mitochondrial cytochrome c oxidase subunit 1 gene (COI). Our results revealed strikingly different levels of genetic diversity: low levels in T. libellula contrasted with higher diversity in T. abyssorum. No spatial genetic structure was found, and both species exhibited high levels of connectivity and evidence of historic demographic expansion. The observed low genetic diversity, in combination with cold adaptations, could cause T. libellula to be more susceptible to the warming Arctic. In contrast, high diversity likely increases adaptive potential in T. abyssorum. In order to comprehensively characterize the prey spectrum of both Themisto species, we also applied DNA metabarcoding, also using COI, on gut contents. Both species showed a regional variation in prey spectrum. T. abyssorum’s diet showed a clear dominance of reads identified as chaetognath species, whereas T. libellula had a broader prey spectrum, including ice-associated taxa such as polar cod. Calanoid copepods did not appear as important as prey as assumed from previous (morphological) studies. Several previously overlooked jellyfish taxa were found in the stomachs of both species. The broad prey spectrum of T. libellula may ... |
author2 |
Kassens, Heidemarie Damaske, Detlef Diekmann, Bernhard Flisker, Frank Heinemann, Günther Herrle, Jens O. Karsten, Ulf Koglin, Nikola Kruse, Frigga Lehmann, Ralph Lüdecke, Cornelia Mayer, Christoph Sattler, Birgit Scheinert, Mirko Spiegel-Behnke, Cornelia Tiedemann, Ralf |
format |
Book |
author |
Dischereit, Annkathrin Havermans, Charlotte Murray, Ayla |
spellingShingle |
Dischereit, Annkathrin Havermans, Charlotte Murray, Ayla Arctic vs sub-Arctic pelagic amphipods in the face of climate change: Insights into the genetic connectivity and diet spectrum of Themisto libellula and T. abyssorum. In: POLAR REGIONS, CLIMATE CHANGE AND SOCIETY, 28TH INTERNATIONAL POLAR CONFERENCE, POTSDAM, 01 – 05 MAY 2022. |
author_facet |
Dischereit, Annkathrin Havermans, Charlotte Murray, Ayla |
author_sort |
Dischereit, Annkathrin |
title |
Arctic vs sub-Arctic pelagic amphipods in the face of climate change: Insights into the genetic connectivity and diet spectrum of Themisto libellula and T. abyssorum. In: POLAR REGIONS, CLIMATE CHANGE AND SOCIETY, 28TH INTERNATIONAL POLAR CONFERENCE, POTSDAM, 01 – 05 MAY 2022. |
title_short |
Arctic vs sub-Arctic pelagic amphipods in the face of climate change: Insights into the genetic connectivity and diet spectrum of Themisto libellula and T. abyssorum. In: POLAR REGIONS, CLIMATE CHANGE AND SOCIETY, 28TH INTERNATIONAL POLAR CONFERENCE, POTSDAM, 01 – 05 MAY 2022. |
title_full |
Arctic vs sub-Arctic pelagic amphipods in the face of climate change: Insights into the genetic connectivity and diet spectrum of Themisto libellula and T. abyssorum. In: POLAR REGIONS, CLIMATE CHANGE AND SOCIETY, 28TH INTERNATIONAL POLAR CONFERENCE, POTSDAM, 01 – 05 MAY 2022. |
title_fullStr |
Arctic vs sub-Arctic pelagic amphipods in the face of climate change: Insights into the genetic connectivity and diet spectrum of Themisto libellula and T. abyssorum. In: POLAR REGIONS, CLIMATE CHANGE AND SOCIETY, 28TH INTERNATIONAL POLAR CONFERENCE, POTSDAM, 01 – 05 MAY 2022. |
title_full_unstemmed |
Arctic vs sub-Arctic pelagic amphipods in the face of climate change: Insights into the genetic connectivity and diet spectrum of Themisto libellula and T. abyssorum. In: POLAR REGIONS, CLIMATE CHANGE AND SOCIETY, 28TH INTERNATIONAL POLAR CONFERENCE, POTSDAM, 01 – 05 MAY 2022. |
title_sort |
arctic vs sub-arctic pelagic amphipods in the face of climate change: insights into the genetic connectivity and diet spectrum of themisto libellula and t. abyssorum. 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/56367/ https://hdl.handle.net/10013/epic.037fecb6-c6f9-4eb4-a799-067adc51658f |
genre |
Arctic Berichte zur Polar- und Meeresforschung Climate change Fram Strait Greenland polar cod Reports on Polar and Marine Research Svalbard Themisto abyssorum Themisto Themisto libellula Zooplankton Copepods |
genre_facet |
Arctic Berichte zur Polar- und Meeresforschung Climate change Fram Strait Greenland polar cod Reports on Polar and Marine Research Svalbard Themisto abyssorum Themisto Themisto libellula Zooplankton Copepods |
op_source |
EPIC3Bremerhaven, AWI, Berichte zur Polar- und Meeresforschung = Reports on polar and marine research, 158 p. |
op_relation |
Dischereit, A. orcid:0000-0002-6158-0825 , Havermans, C. orcid:0000-0002-1126-4074 and Murray, A. orcid:0000-0002-9134-7768 (2022) Arctic vs sub-Arctic pelagic amphipods in the face of climate change: Insights into the genetic connectivity and diet spectrum of Themisto libellula and T. abyssorum. 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, AWI, 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.037fecb6-c6f9-4eb4-a799-067adc51658f |
op_doi |
https://doi.org/10.57738/BzPM_0762_2022 |
_version_ |
1810293284966236160 |
spelling |
ftawi:oai:epic.awi.de:56367 2024-09-15T17:51:23+00:00 Arctic vs sub-Arctic pelagic amphipods in the face of climate change: Insights into the genetic connectivity and diet spectrum of Themisto libellula and T. abyssorum. In: POLAR REGIONS, CLIMATE CHANGE AND SOCIETY, 28TH INTERNATIONAL POLAR CONFERENCE, POTSDAM, 01 – 05 MAY 2022. Dischereit, Annkathrin Havermans, Charlotte Murray, Ayla Kassens, Heidemarie Damaske, Detlef Diekmann, Bernhard Flisker, Frank Heinemann, Günther Herrle, Jens O. Karsten, Ulf Koglin, Nikola Kruse, Frigga Lehmann, Ralph Lüdecke, Cornelia Mayer, Christoph Sattler, Birgit Scheinert, Mirko Spiegel-Behnke, Cornelia Tiedemann, Ralf 2022-05-01 https://epic.awi.de/id/eprint/56367/ https://hdl.handle.net/10013/epic.037fecb6-c6f9-4eb4-a799-067adc51658f unknown Berichte zur Polar- und Meeresforschung = Reports on polar and marine research Dischereit, A. orcid:0000-0002-6158-0825 , Havermans, C. orcid:0000-0002-1126-4074 and Murray, A. orcid:0000-0002-9134-7768 (2022) Arctic vs sub-Arctic pelagic amphipods in the face of climate change: Insights into the genetic connectivity and diet spectrum of Themisto libellula and T. abyssorum. 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, AWI, 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.037fecb6-c6f9-4eb4-a799-067adc51658f EPIC3Bremerhaven, AWI, Berichte zur Polar- und Meeresforschung = Reports on polar and marine research, 158 p. Book peerRev 2022 ftawi https://doi.org/10.57738/BzPM_0762_2022 2024-06-24T04:28:46Z Rapid warming in the Arctic is drastically impacting marine ecosystems, affecting pelagic communities and food web structure. Themisto amphipods are dominant in the Arctic zooplankton community and represent a key link between secondary producers and higher trophic levels. In the Arctic seas, two coexisting species are found in high biomass: Themisto libellula, considered a true Arctic species and Themisto abyssorum, a sub-Arctic, boreal species. Many aspects of the ecology and genetic structure of these two species are not well studied, despite their importance in the food web. First, we tested both species for levels of genetic diversity and then assessed their diet spectrum with molecular methods, with a regional focus on the Greenland shelf, Fram Strait and Svalbard. Spatial genetic structure was evaluated using the mitochondrial cytochrome c oxidase subunit 1 gene (COI). Our results revealed strikingly different levels of genetic diversity: low levels in T. libellula contrasted with higher diversity in T. abyssorum. No spatial genetic structure was found, and both species exhibited high levels of connectivity and evidence of historic demographic expansion. The observed low genetic diversity, in combination with cold adaptations, could cause T. libellula to be more susceptible to the warming Arctic. In contrast, high diversity likely increases adaptive potential in T. abyssorum. In order to comprehensively characterize the prey spectrum of both Themisto species, we also applied DNA metabarcoding, also using COI, on gut contents. Both species showed a regional variation in prey spectrum. T. abyssorum’s diet showed a clear dominance of reads identified as chaetognath species, whereas T. libellula had a broader prey spectrum, including ice-associated taxa such as polar cod. Calanoid copepods did not appear as important as prey as assumed from previous (morphological) studies. Several previously overlooked jellyfish taxa were found in the stomachs of both species. The broad prey spectrum of T. libellula may ... Book Arctic Berichte zur Polar- und Meeresforschung Climate change Fram Strait Greenland polar cod Reports on Polar and Marine Research Svalbard Themisto abyssorum Themisto Themisto libellula Zooplankton Copepods Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |