Cold-seep macrofaunal assemblages in cores from Vestnesa Ridge, eastern Fram Strait
Four cores from 1200 m water depth from Vestnesa Ridge on the western Svalbard margin in the eastern Fram Strait were studied for their content of fossil macro-faunas. Three of the cores were collected from a pockmark with active methane seepage, and one core (control core) was taken just outside th...
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Norwegian Polar Institute (NPI)
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ftoslouniv:oai:www.duo.uio.no:10852/74512 2023-05-15T15:10:00+02:00 Cold-seep macrofaunal assemblages in cores from Vestnesa Ridge, eastern Fram Strait Thomsen, Elsebeth Rasmussen, Tine Lander Sztybor, Kamila Hanken, Nils-Martin Tendal, Ole Secher Uchman, Alfred 2019-10-22T14:16:47Z http://hdl.handle.net/10852/74512 http://urn.nb.no/URN:NBN:no-77616 https://doi.org/10.33265/polar.v38.3310 EN eng Norwegian Polar Institute (NPI) NFR/223259 UIT/Publication fund UIT/MOHN FOUNDATION: PALEO-CIRCUS PROJECT 2010-2014 UIT/ http://urn.nb.no/URN:NBN:no-77616 Thomsen, Elsebeth Rasmussen, Tine Lander Sztybor, Kamila Hanken, Nils-Martin Tendal, Ole Secher Uchman, Alfred . Cold-seep macrofaunal assemblages in cores from Vestnesa Ridge, eastern Fram Strait. Polar Research. 2019, 38 http://hdl.handle.net/10852/74512 1739557 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Polar Research&rft.volume=38&rft.spage=&rft.date=2019 Polar Research 38 0 20 https://doi.org/10.33265/polar.v38.3310 URN:NBN:no-77616 Fulltext https://www.duo.uio.no/bitstream/handle/10852/74512/2/Thomsenetal2019.pdf Attribution-NonCommercial 4.0 International https://creativecommons.org/licenses/by-nc/4.0/ CC-BY-NC 0800-0395 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2019 ftoslouniv https://doi.org/10.33265/polar.v38.3310 2020-06-21T08:54:00Z Four cores from 1200 m water depth from Vestnesa Ridge on the western Svalbard margin in the eastern Fram Strait were studied for their content of fossil macro-faunas. Three of the cores were collected from a pockmark with active methane seepage, and one core (control core) was taken just outside the seepage area for comparison. Together the cores cover the last 45 000 years (mid-late Weichselian glacial, the deglaciation and the Holocene). The records show a range of influence of methane from no seepage (control core) and, although variable through time, from moderate seepage, to strong and very strong seepage. All cores have been analysed for the macrofossils >1 mm, trace fossils, planktic foraminifera, stableisotopes, geochemistry and sedimentology. The main purpose of the study is to improve our knowledge of the fossil macrofauna and past environmental changes related to the impact of methane emissions in the area. The core recovered outside the pockmark contained no fossil macrofaunas, while cores from inside the pock-mark contained chemosymbiotic bivalves, and in some cases a rich macrofauna. The faunal relationships with the sedimentary environments confirm a close con-nection between the macrofauna and the variability in influence of cold seepage, particularly seen in the occurrence of chemosymbiotic bivalves Archivesica arctica, Isorropodon nyeggaensis, potentially chemosymbiotic bivalve Rhacothyas kolgae, poly-chaetes and an associated rich fauna of small epifaunal gastropods, showing that Arctic seeps were oases for macrofaunas in the past as they are today Article in Journal/Newspaper Arctic Foraminifera* Fram Strait Polar Research Svalbard Svalbard margin Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Arctic Svalbard Polar Research 38 0 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Four cores from 1200 m water depth from Vestnesa Ridge on the western Svalbard margin in the eastern Fram Strait were studied for their content of fossil macro-faunas. Three of the cores were collected from a pockmark with active methane seepage, and one core (control core) was taken just outside the seepage area for comparison. Together the cores cover the last 45 000 years (mid-late Weichselian glacial, the deglaciation and the Holocene). The records show a range of influence of methane from no seepage (control core) and, although variable through time, from moderate seepage, to strong and very strong seepage. All cores have been analysed for the macrofossils >1 mm, trace fossils, planktic foraminifera, stableisotopes, geochemistry and sedimentology. The main purpose of the study is to improve our knowledge of the fossil macrofauna and past environmental changes related to the impact of methane emissions in the area. The core recovered outside the pockmark contained no fossil macrofaunas, while cores from inside the pock-mark contained chemosymbiotic bivalves, and in some cases a rich macrofauna. The faunal relationships with the sedimentary environments confirm a close con-nection between the macrofauna and the variability in influence of cold seepage, particularly seen in the occurrence of chemosymbiotic bivalves Archivesica arctica, Isorropodon nyeggaensis, potentially chemosymbiotic bivalve Rhacothyas kolgae, poly-chaetes and an associated rich fauna of small epifaunal gastropods, showing that Arctic seeps were oases for macrofaunas in the past as they are today |
format |
Article in Journal/Newspaper |
author |
Thomsen, Elsebeth Rasmussen, Tine Lander Sztybor, Kamila Hanken, Nils-Martin Tendal, Ole Secher Uchman, Alfred |
spellingShingle |
Thomsen, Elsebeth Rasmussen, Tine Lander Sztybor, Kamila Hanken, Nils-Martin Tendal, Ole Secher Uchman, Alfred Cold-seep macrofaunal assemblages in cores from Vestnesa Ridge, eastern Fram Strait |
author_facet |
Thomsen, Elsebeth Rasmussen, Tine Lander Sztybor, Kamila Hanken, Nils-Martin Tendal, Ole Secher Uchman, Alfred |
author_sort |
Thomsen, Elsebeth |
title |
Cold-seep macrofaunal assemblages in cores from Vestnesa Ridge, eastern Fram Strait |
title_short |
Cold-seep macrofaunal assemblages in cores from Vestnesa Ridge, eastern Fram Strait |
title_full |
Cold-seep macrofaunal assemblages in cores from Vestnesa Ridge, eastern Fram Strait |
title_fullStr |
Cold-seep macrofaunal assemblages in cores from Vestnesa Ridge, eastern Fram Strait |
title_full_unstemmed |
Cold-seep macrofaunal assemblages in cores from Vestnesa Ridge, eastern Fram Strait |
title_sort |
cold-seep macrofaunal assemblages in cores from vestnesa ridge, eastern fram strait |
publisher |
Norwegian Polar Institute (NPI) |
publishDate |
2019 |
url |
http://hdl.handle.net/10852/74512 http://urn.nb.no/URN:NBN:no-77616 https://doi.org/10.33265/polar.v38.3310 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Foraminifera* Fram Strait Polar Research Svalbard Svalbard margin |
genre_facet |
Arctic Foraminifera* Fram Strait Polar Research Svalbard Svalbard margin |
op_source |
0800-0395 |
op_relation |
NFR/223259 UIT/Publication fund UIT/MOHN FOUNDATION: PALEO-CIRCUS PROJECT 2010-2014 UIT/ http://urn.nb.no/URN:NBN:no-77616 Thomsen, Elsebeth Rasmussen, Tine Lander Sztybor, Kamila Hanken, Nils-Martin Tendal, Ole Secher Uchman, Alfred . Cold-seep macrofaunal assemblages in cores from Vestnesa Ridge, eastern Fram Strait. Polar Research. 2019, 38 http://hdl.handle.net/10852/74512 1739557 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Polar Research&rft.volume=38&rft.spage=&rft.date=2019 Polar Research 38 0 20 https://doi.org/10.33265/polar.v38.3310 URN:NBN:no-77616 Fulltext https://www.duo.uio.no/bitstream/handle/10852/74512/2/Thomsenetal2019.pdf |
op_rights |
Attribution-NonCommercial 4.0 International https://creativecommons.org/licenses/by-nc/4.0/ |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.33265/polar.v38.3310 |
container_title |
Polar Research |
container_volume |
38 |
container_issue |
0 |
_version_ |
1766341076710326272 |