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dc.contributor.authorHansen, Jesper
dc.contributor.authorEzat, Mohamed
dc.contributor.authorÅström, Emmelie
dc.contributor.authorRasmussen, Tine Lander
dc.date.accessioned2019-08-06T08:25:36Z
dc.date.available2019-08-06T08:25:36Z
dc.date.issued2019-05-01
dc.description.abstractWe report, for the first time, the solemyid <i>Acharax svalbardensis</i> 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 <i>Acharax svalbardensis</i> 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 <i>Archivesica arctica</i> and <i>Isorropodon nyeggaensis</i> 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 <i>A. arctica</i> and <i>I. nyeggaensis</i> and the new species of the solemyid bivalve genus <i>Acharax</i> described here.en_US
dc.description.sponsorshipVISTA (Norwegian Academy of Science and Letters & Equinor)en_US
dc.descriptionThis is an Accepted Manuscript of an article published by Taylor & Francis in the <i>Journal of Systematic Palaeontology</i> on 1 May 2019, available online: <a href=https://www.tandfonline.com/doi/full/10.1080/14772019.2019.1594420>https://www.tandfonline.com/doi/full/10.1080/14772019.2019.1594420</a>.en_US
dc.identifier.citationHansen, J., Ezat, M.M., Åström, E.K.L. & Rasmussen, T.L. (2019). New Late Pleistocene species of Acharax from Arctic methane seeps off Svalbard. <i>Journal of Systematic Palaeontology</i>. https://doi.org/10.1080/14772019.2019.1594420en_US
dc.identifier.cristinIDFRIDAID 1694990
dc.identifier.doi10.1080/14772019.2019.1594420
dc.identifier.issn1477-2019
dc.identifier.issn1478-0941
dc.identifier.urihttps://hdl.handle.net/10037/15850
dc.language.isoengen_US
dc.publisherTaylor & Francisen_US
dc.relation.journalJournal of Systematic Palaeontology
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/FRINATEK/ 274429/Norway/Paleo-perspectives for the future circulation and carbon cycle dynamics in the Arctic Ocean//en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223259/Norway/Centre for Arctic Gas Hydrate, Environment and Climate/CAGE/en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Stratigraphy and paleontology: 461en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Stratigrafi og paleontologi: 461en_US
dc.subjectBivalviaen_US
dc.subjectChemosymbioticen_US
dc.subjectAcharax svalbardensis sp. nov.en_US
dc.subjectSolemyidaeen_US
dc.subjectHeinrich Stadial HS1en_US
dc.subjectBottom water temperatureen_US
dc.titleNew Late Pleistocene species of Acharax from Arctic methane seeps off Svalbarden_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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