Diatom (Bacillariophyceae) flora of early Holocene freshwater sediments from Skalafjord, Faeroe Islands
Relative abundance data of diatom (Bacillariophyceae) species were generated for sediment core SKPC-01B from the Skalafjord, Faeroe Islands. The record shows distinct temporal changes in species composition. In the lowermost 65 cm of the 230 cm long core a species-rich freshwater diatom assemblage w...
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ftcopernicus:oai:publications.copernicus.org:jm65497 2023-05-15T16:50:52+02:00 Diatom (Bacillariophyceae) flora of early Holocene freshwater sediments from Skalafjord, Faeroe Islands Witon, Ewa Witkowski, Andrzej 2018-09-27 application/pdf https://doi.org/10.1144/jm.22.2.183 https://jm.copernicus.org/articles/22/183/2003/ eng eng doi:10.1144/jm.22.2.183 https://jm.copernicus.org/articles/22/183/2003/ eISSN: 2041-4978 Text 2018 ftcopernicus https://doi.org/10.1144/jm.22.2.183 2020-07-20T16:27:40Z Relative abundance data of diatom (Bacillariophyceae) species were generated for sediment core SKPC-01B from the Skalafjord, Faeroe Islands. The record shows distinct temporal changes in species composition. In the lowermost 65 cm of the 230 cm long core a species-rich freshwater diatom assemblage was found. Most of the taxa observed in this section are typical of oligotrophic to dystrophic lakes in northern Europe (Scandinavia, Iceland and Spitsbergen). Above this interval the diatom flora is dominated by marine taxa. The change from a freshwater to a marine flora is inferred to be caused by rising sea-level that took place about 7700–6400 years BP. Drastic changes in the diatom species composition within the transitional core section show that environmental change in the Skalafjord took place in several pulses. The first stage included strong inflow (possibly catastrophic) of marine waters. As a possible trigger of this phenomenon the tsunami released by the Storegga Slide is proposed. Before the final flooding by marine waters, freshwater conditions were re-established within the Skalafjord. These results have important implications for the interpretation of the palaeogeographical development of the Eysturoy area. Hence, it is suggested that the Storegga Slide led to inflow of marine waters at a distinctly lower water level in the area of the Skalafjord than proposed in recent publications and that the inundation of the threshold in the fjord happened after the tsunami. Text Iceland Spitsbergen Copernicus Publications: E-Journals Eysturoy ENVELOPE(-6.878,-6.878,62.216,62.216) Storegga ENVELOPE(18.251,18.251,68.645,68.645) Journal of Micropalaeontology 22 2 183 208 |
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Open Polar |
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Copernicus Publications: E-Journals |
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ftcopernicus |
language |
English |
description |
Relative abundance data of diatom (Bacillariophyceae) species were generated for sediment core SKPC-01B from the Skalafjord, Faeroe Islands. The record shows distinct temporal changes in species composition. In the lowermost 65 cm of the 230 cm long core a species-rich freshwater diatom assemblage was found. Most of the taxa observed in this section are typical of oligotrophic to dystrophic lakes in northern Europe (Scandinavia, Iceland and Spitsbergen). Above this interval the diatom flora is dominated by marine taxa. The change from a freshwater to a marine flora is inferred to be caused by rising sea-level that took place about 7700–6400 years BP. Drastic changes in the diatom species composition within the transitional core section show that environmental change in the Skalafjord took place in several pulses. The first stage included strong inflow (possibly catastrophic) of marine waters. As a possible trigger of this phenomenon the tsunami released by the Storegga Slide is proposed. Before the final flooding by marine waters, freshwater conditions were re-established within the Skalafjord. These results have important implications for the interpretation of the palaeogeographical development of the Eysturoy area. Hence, it is suggested that the Storegga Slide led to inflow of marine waters at a distinctly lower water level in the area of the Skalafjord than proposed in recent publications and that the inundation of the threshold in the fjord happened after the tsunami. |
format |
Text |
author |
Witon, Ewa Witkowski, Andrzej |
spellingShingle |
Witon, Ewa Witkowski, Andrzej Diatom (Bacillariophyceae) flora of early Holocene freshwater sediments from Skalafjord, Faeroe Islands |
author_facet |
Witon, Ewa Witkowski, Andrzej |
author_sort |
Witon, Ewa |
title |
Diatom (Bacillariophyceae) flora of early Holocene freshwater sediments from Skalafjord, Faeroe Islands |
title_short |
Diatom (Bacillariophyceae) flora of early Holocene freshwater sediments from Skalafjord, Faeroe Islands |
title_full |
Diatom (Bacillariophyceae) flora of early Holocene freshwater sediments from Skalafjord, Faeroe Islands |
title_fullStr |
Diatom (Bacillariophyceae) flora of early Holocene freshwater sediments from Skalafjord, Faeroe Islands |
title_full_unstemmed |
Diatom (Bacillariophyceae) flora of early Holocene freshwater sediments from Skalafjord, Faeroe Islands |
title_sort |
diatom (bacillariophyceae) flora of early holocene freshwater sediments from skalafjord, faeroe islands |
publishDate |
2018 |
url |
https://doi.org/10.1144/jm.22.2.183 https://jm.copernicus.org/articles/22/183/2003/ |
long_lat |
ENVELOPE(-6.878,-6.878,62.216,62.216) ENVELOPE(18.251,18.251,68.645,68.645) |
geographic |
Eysturoy Storegga |
geographic_facet |
Eysturoy Storegga |
genre |
Iceland Spitsbergen |
genre_facet |
Iceland Spitsbergen |
op_source |
eISSN: 2041-4978 |
op_relation |
doi:10.1144/jm.22.2.183 https://jm.copernicus.org/articles/22/183/2003/ |
op_doi |
https://doi.org/10.1144/jm.22.2.183 |
container_title |
Journal of Micropalaeontology |
container_volume |
22 |
container_issue |
2 |
container_start_page |
183 |
op_container_end_page |
208 |
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1766040983119593472 |