New Late Pleistocene species of Acharax from Arctic methane seeps off Svalbard
This is an Accepted Manuscript of an article published by Taylor & Francis in the Journal of Systematic Palaeontology on 1 May 2019, available online: https://www.tandfonline.com/doi/full/10.1080/14772019.2019.1594420 . We report, for the first time, the solemyid Acharax svalbardensis sp. nov.,...
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Online Access: | https://hdl.handle.net/10037/15850 https://doi.org/10.1080/14772019.2019.1594420 |
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ftunivtroemsoe:oai:munin.uit.no:10037/15850 2023-05-15T14:22:28+02:00 New Late Pleistocene species of Acharax from Arctic methane seeps off Svalbard Hansen, Jesper Ezat, Mohamed Åström, Emmelie Rasmussen, Tine Lander 2019-05-01 https://hdl.handle.net/10037/15850 https://doi.org/10.1080/14772019.2019.1594420 eng eng Taylor & Francis Journal of Systematic Palaeontology info:eu-repo/grantAgreement/RCN/FRINATEK/ 274429/Norway/Paleo-perspectives for the future circulation and carbon cycle dynamics in the Arctic Ocean// info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Hansen, J., Ezat, M.M., Åström, E.K.L. & Rasmussen, T.L. (2019). New Late Pleistocene species of Acharax from Arctic methane seeps off Svalbard. Journal of Systematic Palaeontology . https://doi.org/10.1080/14772019.2019.1594420 FRIDAID 1694990 doi:10.1080/14772019.2019.1594420 1477-2019 1478-0941 https://hdl.handle.net/10037/15850 openAccess VDP::Mathematics and natural science: 400::Geosciences: 450::Stratigraphy and paleontology: 461 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Stratigrafi og paleontologi: 461 Bivalvia Chemosymbiotic Acharax svalbardensis sp. nov Solemyidae Heinrich Stadial HS1 Bottom water temperature Journal article Tidsskriftartikkel Peer reviewed 2019 ftunivtroemsoe https://doi.org/10.1080/14772019.2019.1594420 2021-06-25T17:56:33Z This is an Accepted Manuscript of an article published by Taylor & Francis in the Journal of Systematic Palaeontology on 1 May 2019, available online: https://www.tandfonline.com/doi/full/10.1080/14772019.2019.1594420 . We report, for the first time, the solemyid Acharax svalbardensis sp. nov., from deep-sea methane seep sites on the western Svalbard margin, 79°N. This species is rather small and so far the northernmost representative of its genus. It is identified based on the following combination of diagnostic characters: umbo 27–30% valve length from posterior margin; H/L ratio ∼0.35; broadly rounded to truncated anterior margin; 15 moderately developed, flat double ribs with middle ribs about as strong as posterior ribs. The shells from Acharax svalbardensis sp. nov. were found in sediment cores from two pockmarks at Vestnesa Ridge at ∼1200 m water depth in the Fram Strait off NW Spitsbergen, Svalbard archipelago. Previously, the vesicomyid bivalves Archivesica arctica and Isorropodon nyeggaensis have been documented from the same pockmarks. Here, we describe the new solemyid species and report its stratigraphical occurrence and co-occurrence with the previously described methane seep-associated vesicomyids. All findings of the vesicomyids and the new solemyid species are restricted to the time interval ∼19,000–15,600 cal. years BP, correlating with Heinrich Stadial HS1. This period was characterized by cold surface conditions and extensive ice rafting from sea ice and icebergs in the North Atlantic and Arctic region. Inflow of a warm subsurface current of Atlantic water below the melt water layer led to higher bottom water temperatures at the Svalbard margin than at present. This increase in bottom water temperature probably allowed several methane seep-associated bivalve species to settle for a short period of time, namely the vesicomyids A. arctica and I. nyeggaensis and the new species of the solemyid bivalve genus Acharax described here. Article in Journal/Newspaper Arctic arctic methane Arctic Fram Strait Iceberg* North Atlantic Sea ice Svalbard Svalbard margin Spitsbergen University of Tromsø: Munin Open Research Archive Arctic Svalbard Svalbard Archipelago Journal of Systematic Palaeontology 18 2 197 212 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450::Stratigraphy and paleontology: 461 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Stratigrafi og paleontologi: 461 Bivalvia Chemosymbiotic Acharax svalbardensis sp. nov Solemyidae Heinrich Stadial HS1 Bottom water temperature |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450::Stratigraphy and paleontology: 461 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Stratigrafi og paleontologi: 461 Bivalvia Chemosymbiotic Acharax svalbardensis sp. nov Solemyidae Heinrich Stadial HS1 Bottom water temperature Hansen, Jesper Ezat, Mohamed Åström, Emmelie Rasmussen, Tine Lander New Late Pleistocene species of Acharax from Arctic methane seeps off Svalbard |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450::Stratigraphy and paleontology: 461 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Stratigrafi og paleontologi: 461 Bivalvia Chemosymbiotic Acharax svalbardensis sp. nov Solemyidae Heinrich Stadial HS1 Bottom water temperature |
description |
This is an Accepted Manuscript of an article published by Taylor & Francis in the Journal of Systematic Palaeontology on 1 May 2019, available online: https://www.tandfonline.com/doi/full/10.1080/14772019.2019.1594420 . We report, for the first time, the solemyid Acharax svalbardensis sp. nov., from deep-sea methane seep sites on the western Svalbard margin, 79°N. This species is rather small and so far the northernmost representative of its genus. It is identified based on the following combination of diagnostic characters: umbo 27–30% valve length from posterior margin; H/L ratio ∼0.35; broadly rounded to truncated anterior margin; 15 moderately developed, flat double ribs with middle ribs about as strong as posterior ribs. The shells from Acharax svalbardensis sp. nov. were found in sediment cores from two pockmarks at Vestnesa Ridge at ∼1200 m water depth in the Fram Strait off NW Spitsbergen, Svalbard archipelago. Previously, the vesicomyid bivalves Archivesica arctica and Isorropodon nyeggaensis have been documented from the same pockmarks. Here, we describe the new solemyid species and report its stratigraphical occurrence and co-occurrence with the previously described methane seep-associated vesicomyids. All findings of the vesicomyids and the new solemyid species are restricted to the time interval ∼19,000–15,600 cal. years BP, correlating with Heinrich Stadial HS1. This period was characterized by cold surface conditions and extensive ice rafting from sea ice and icebergs in the North Atlantic and Arctic region. Inflow of a warm subsurface current of Atlantic water below the melt water layer led to higher bottom water temperatures at the Svalbard margin than at present. This increase in bottom water temperature probably allowed several methane seep-associated bivalve species to settle for a short period of time, namely the vesicomyids A. arctica and I. nyeggaensis and the new species of the solemyid bivalve genus Acharax described here. |
format |
Article in Journal/Newspaper |
author |
Hansen, Jesper Ezat, Mohamed Åström, Emmelie Rasmussen, Tine Lander |
author_facet |
Hansen, Jesper Ezat, Mohamed Åström, Emmelie Rasmussen, Tine Lander |
author_sort |
Hansen, Jesper |
title |
New Late Pleistocene species of Acharax from Arctic methane seeps off Svalbard |
title_short |
New Late Pleistocene species of Acharax from Arctic methane seeps off Svalbard |
title_full |
New Late Pleistocene species of Acharax from Arctic methane seeps off Svalbard |
title_fullStr |
New Late Pleistocene species of Acharax from Arctic methane seeps off Svalbard |
title_full_unstemmed |
New Late Pleistocene species of Acharax from Arctic methane seeps off Svalbard |
title_sort |
new late pleistocene species of acharax from arctic methane seeps off svalbard |
publisher |
Taylor & Francis |
publishDate |
2019 |
url |
https://hdl.handle.net/10037/15850 https://doi.org/10.1080/14772019.2019.1594420 |
geographic |
Arctic Svalbard Svalbard Archipelago |
geographic_facet |
Arctic Svalbard Svalbard Archipelago |
genre |
Arctic arctic methane Arctic Fram Strait Iceberg* North Atlantic Sea ice Svalbard Svalbard margin Spitsbergen |
genre_facet |
Arctic arctic methane Arctic Fram Strait Iceberg* North Atlantic Sea ice Svalbard Svalbard margin Spitsbergen |
op_relation |
Journal of Systematic Palaeontology info:eu-repo/grantAgreement/RCN/FRINATEK/ 274429/Norway/Paleo-perspectives for the future circulation and carbon cycle dynamics in the Arctic Ocean// info:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/ Hansen, J., Ezat, M.M., Åström, E.K.L. & Rasmussen, T.L. (2019). New Late Pleistocene species of Acharax from Arctic methane seeps off Svalbard. Journal of Systematic Palaeontology . https://doi.org/10.1080/14772019.2019.1594420 FRIDAID 1694990 doi:10.1080/14772019.2019.1594420 1477-2019 1478-0941 https://hdl.handle.net/10037/15850 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.1080/14772019.2019.1594420 |
container_title |
Journal of Systematic Palaeontology |
container_volume |
18 |
container_issue |
2 |
container_start_page |
197 |
op_container_end_page |
212 |
_version_ |
1766295051245191168 |