Mesopelagic Sound Scattering Layers of the High Arctic: Seasonal Variations in Biomass, Species Assemblage, and Trophic Relationships
Mesopelagic sound scattering layers (SSL) are ubiquitous in all oceans. Pelagic organisms within the SSL play important roles as prey for higher trophic levels and in climate regulation through the biological carbon pump. Yet, the biomass and species composition of SSL in the Arctic Ocean remain poo...
Published in: | Frontiers in Marine Science |
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Online Access: | https://doi.org/10.3389/fmars.2019.00364 https://doaj.org/article/239f210959724985af2c5b100f68b9d8 |
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ftdoajarticles:oai:doaj.org/article:239f210959724985af2c5b100f68b9d8 2023-05-15T14:30:26+02:00 Mesopelagic Sound Scattering Layers of the High Arctic: Seasonal Variations in Biomass, Species Assemblage, and Trophic Relationships Maxime Geoffroy Malin Daase Marine Cusa Gérald Darnis Martin Graeve Néstor Santana Hernández Jørgen Berge Paul E. Renaud Finlo Cottier Stig Falk-Petersen 2019-07-01T00:00:00Z https://doi.org/10.3389/fmars.2019.00364 https://doaj.org/article/239f210959724985af2c5b100f68b9d8 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fmars.2019.00364/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2019.00364 https://doaj.org/article/239f210959724985af2c5b100f68b9d8 Frontiers in Marine Science, Vol 6 (2019) mesopelagic fish and zooplankton Arctic and boreal ecosystems seasonality fatty acid trophic markers Sebastes Barents Sea Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2019 ftdoajarticles https://doi.org/10.3389/fmars.2019.00364 2022-12-31T08:53:52Z Mesopelagic sound scattering layers (SSL) are ubiquitous in all oceans. Pelagic organisms within the SSL play important roles as prey for higher trophic levels and in climate regulation through the biological carbon pump. Yet, the biomass and species composition of SSL in the Arctic Ocean remain poorly documented, particularly in winter. A multifrequency echosounder detected a SSL north of Svalbard, from 79.8 to 81.4°N, in January 2016, August 2016, and January 2017. Midwater trawl sampling confirmed that the SSL comprised zooplankton and pelagic fish of boreal and Arctic origins. Arctic cod dominated the fish assemblage in August and juvenile beaked redfish in January. The macrozooplankton community mainly comprised the medusa Cyanea capillata, the amphipod Themisto libellula, and the euphausiids Meganyctiphanes norvegica in August and Thysanoessa inermis in January. The SSL was located in the Atlantic Water mass, between 200–700 m in August and between 50–500 m in January. In January, the SSL was shallower and weaker above the deeper basin, where less Atlantic Water penetrated. The energy content available in the form of lipids within the SSL was significantly higher in summer than winter. The biomass within the SSL was >12-fold higher in summer, and the diversity of fish was slightly higher than in winter (12 vs. 9 species). We suggest that these differences are mainly related to life history and ontogenetic changes resulting in a descent toward the seafloor, outside the mesopelagic layer, in winter. In addition, some fish species of boreal origin, such as the spotted barracudina, did not seem to survive the polar night when advected from the Atlantic into the Arctic. Others, mainly juvenile beaked redfish, were abundant in both summer and winter, implying that the species can survive the polar night and possibly extend its range into the high Arctic. Fatty-acid trophic markers revealed that Arctic cod mainly fed on calanoid copepods while juvenile beaked redfish targeted krill (Thysanoessa spp.). The ... Article in Journal/Newspaper Arctic cod Arctic Arctic Ocean Barents Sea Meganyctiphanes norvegica polar night Svalbard Themisto Themisto libellula Zooplankton Copepods Thysanoessa inermis Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Svalbard Barents Sea Medusa ENVELOPE(157.417,157.417,-79.633,-79.633) Frontiers in Marine Science 6 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
mesopelagic fish and zooplankton Arctic and boreal ecosystems seasonality fatty acid trophic markers Sebastes Barents Sea Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
mesopelagic fish and zooplankton Arctic and boreal ecosystems seasonality fatty acid trophic markers Sebastes Barents Sea Science Q General. Including nature conservation geographical distribution QH1-199.5 Maxime Geoffroy Malin Daase Marine Cusa Gérald Darnis Martin Graeve Néstor Santana Hernández Jørgen Berge Paul E. Renaud Finlo Cottier Stig Falk-Petersen Mesopelagic Sound Scattering Layers of the High Arctic: Seasonal Variations in Biomass, Species Assemblage, and Trophic Relationships |
topic_facet |
mesopelagic fish and zooplankton Arctic and boreal ecosystems seasonality fatty acid trophic markers Sebastes Barents Sea Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
Mesopelagic sound scattering layers (SSL) are ubiquitous in all oceans. Pelagic organisms within the SSL play important roles as prey for higher trophic levels and in climate regulation through the biological carbon pump. Yet, the biomass and species composition of SSL in the Arctic Ocean remain poorly documented, particularly in winter. A multifrequency echosounder detected a SSL north of Svalbard, from 79.8 to 81.4°N, in January 2016, August 2016, and January 2017. Midwater trawl sampling confirmed that the SSL comprised zooplankton and pelagic fish of boreal and Arctic origins. Arctic cod dominated the fish assemblage in August and juvenile beaked redfish in January. The macrozooplankton community mainly comprised the medusa Cyanea capillata, the amphipod Themisto libellula, and the euphausiids Meganyctiphanes norvegica in August and Thysanoessa inermis in January. The SSL was located in the Atlantic Water mass, between 200–700 m in August and between 50–500 m in January. In January, the SSL was shallower and weaker above the deeper basin, where less Atlantic Water penetrated. The energy content available in the form of lipids within the SSL was significantly higher in summer than winter. The biomass within the SSL was >12-fold higher in summer, and the diversity of fish was slightly higher than in winter (12 vs. 9 species). We suggest that these differences are mainly related to life history and ontogenetic changes resulting in a descent toward the seafloor, outside the mesopelagic layer, in winter. In addition, some fish species of boreal origin, such as the spotted barracudina, did not seem to survive the polar night when advected from the Atlantic into the Arctic. Others, mainly juvenile beaked redfish, were abundant in both summer and winter, implying that the species can survive the polar night and possibly extend its range into the high Arctic. Fatty-acid trophic markers revealed that Arctic cod mainly fed on calanoid copepods while juvenile beaked redfish targeted krill (Thysanoessa spp.). The ... |
format |
Article in Journal/Newspaper |
author |
Maxime Geoffroy Malin Daase Marine Cusa Gérald Darnis Martin Graeve Néstor Santana Hernández Jørgen Berge Paul E. Renaud Finlo Cottier Stig Falk-Petersen |
author_facet |
Maxime Geoffroy Malin Daase Marine Cusa Gérald Darnis Martin Graeve Néstor Santana Hernández Jørgen Berge Paul E. Renaud Finlo Cottier Stig Falk-Petersen |
author_sort |
Maxime Geoffroy |
title |
Mesopelagic Sound Scattering Layers of the High Arctic: Seasonal Variations in Biomass, Species Assemblage, and Trophic Relationships |
title_short |
Mesopelagic Sound Scattering Layers of the High Arctic: Seasonal Variations in Biomass, Species Assemblage, and Trophic Relationships |
title_full |
Mesopelagic Sound Scattering Layers of the High Arctic: Seasonal Variations in Biomass, Species Assemblage, and Trophic Relationships |
title_fullStr |
Mesopelagic Sound Scattering Layers of the High Arctic: Seasonal Variations in Biomass, Species Assemblage, and Trophic Relationships |
title_full_unstemmed |
Mesopelagic Sound Scattering Layers of the High Arctic: Seasonal Variations in Biomass, Species Assemblage, and Trophic Relationships |
title_sort |
mesopelagic sound scattering layers of the high arctic: seasonal variations in biomass, species assemblage, and trophic relationships |
publisher |
Frontiers Media S.A. |
publishDate |
2019 |
url |
https://doi.org/10.3389/fmars.2019.00364 https://doaj.org/article/239f210959724985af2c5b100f68b9d8 |
long_lat |
ENVELOPE(157.417,157.417,-79.633,-79.633) |
geographic |
Arctic Arctic Ocean Svalbard Barents Sea Medusa |
geographic_facet |
Arctic Arctic Ocean Svalbard Barents Sea Medusa |
genre |
Arctic cod Arctic Arctic Ocean Barents Sea Meganyctiphanes norvegica polar night Svalbard Themisto Themisto libellula Zooplankton Copepods Thysanoessa inermis |
genre_facet |
Arctic cod Arctic Arctic Ocean Barents Sea Meganyctiphanes norvegica polar night Svalbard Themisto Themisto libellula Zooplankton Copepods Thysanoessa inermis |
op_source |
Frontiers in Marine Science, Vol 6 (2019) |
op_relation |
https://www.frontiersin.org/article/10.3389/fmars.2019.00364/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2019.00364 https://doaj.org/article/239f210959724985af2c5b100f68b9d8 |
op_doi |
https://doi.org/10.3389/fmars.2019.00364 |
container_title |
Frontiers in Marine Science |
container_volume |
6 |
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1766304284581822464 |