Environmental changes of the last three centuries indicated by siliceous microfossil records from the southwestern Baltic Sea
Four short sediment cores from the southwestern Baltic Sea were analysed with respect to their content of siliceous microfossils. The aim was to detect and date changes in the composition of the diatom flora and to link these changes to variations in the anthropogenic load of nutrients during the la...
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ftuhipublicatio:oai:pure.atira.dk:publications/6fecc617-afdd-4cd0-9dc1-1e3efdb1ea4b 2024-02-04T10:04:27+01:00 Environmental changes of the last three centuries indicated by siliceous microfossil records from the southwestern Baltic Sea Andren, E Brand, Tim Shimmield, Graham B 1999 https://pure.uhi.ac.uk/en/publications/6fecc617-afdd-4cd0-9dc1-1e3efdb1ea4b eng eng info:eu-repo/semantics/restrictedAccess Andren , E , Brand , T & Shimmield , G B 1999 , ' Environmental changes of the last three centuries indicated by siliceous microfossil records from the southwestern Baltic Sea ' , Holocene , vol. 9 , no. 1 , pp. 25-38 . ANOXIA Geosciences Multidisciplinary Geography Physical SEDIMENT CORE BACILLARIOPHYCEAE ICE HISTORY EUTROPHICATION CHESAPEAKE BAY article 1999 ftuhipublicatio 2024-01-11T23:20:45Z Four short sediment cores from the southwestern Baltic Sea were analysed with respect to their content of siliceous microfossils. The aim was to detect and date changes in the composition of the diatom flora and to link these changes to variations in the anthropogenic load of nutrients during the last century. The study shows that the most significant change in the diatom assemblages occurred 130-140 years ago. The change is recorded in the sediments as a shift from periphytic diatom taxa to a predominance of planktonic taxa. This indicates that the photic layer has decreased in depth, probably due to eutrophication of the Baltic Sea, which consequently began to affect the area investigated approximately AD 1850. To support the results of a changing ratio of periphytic to planktonic diatoms, diatom accumulation rates were calculated In general, the diatom accumulation rate data show a decrease in the periphytic accumulation rates and an increase in the planktonic accumulation rates towards the sediment surface. Some indications of a colder climate are recorded in the sediments approximately 230 years ago. These results are in accordance with the record of maximum extent of sea ice in the same area and are suggested to represent a late stage in the 'Little Ice Age'. Article in Journal/Newspaper Sea ice University of the Highlands and Islands: Research Database of UHI |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
ANOXIA Geosciences Multidisciplinary Geography Physical SEDIMENT CORE BACILLARIOPHYCEAE ICE HISTORY EUTROPHICATION CHESAPEAKE BAY |
spellingShingle |
ANOXIA Geosciences Multidisciplinary Geography Physical SEDIMENT CORE BACILLARIOPHYCEAE ICE HISTORY EUTROPHICATION CHESAPEAKE BAY Andren, E Brand, Tim Shimmield, Graham B Environmental changes of the last three centuries indicated by siliceous microfossil records from the southwestern Baltic Sea |
topic_facet |
ANOXIA Geosciences Multidisciplinary Geography Physical SEDIMENT CORE BACILLARIOPHYCEAE ICE HISTORY EUTROPHICATION CHESAPEAKE BAY |
description |
Four short sediment cores from the southwestern Baltic Sea were analysed with respect to their content of siliceous microfossils. The aim was to detect and date changes in the composition of the diatom flora and to link these changes to variations in the anthropogenic load of nutrients during the last century. The study shows that the most significant change in the diatom assemblages occurred 130-140 years ago. The change is recorded in the sediments as a shift from periphytic diatom taxa to a predominance of planktonic taxa. This indicates that the photic layer has decreased in depth, probably due to eutrophication of the Baltic Sea, which consequently began to affect the area investigated approximately AD 1850. To support the results of a changing ratio of periphytic to planktonic diatoms, diatom accumulation rates were calculated In general, the diatom accumulation rate data show a decrease in the periphytic accumulation rates and an increase in the planktonic accumulation rates towards the sediment surface. Some indications of a colder climate are recorded in the sediments approximately 230 years ago. These results are in accordance with the record of maximum extent of sea ice in the same area and are suggested to represent a late stage in the 'Little Ice Age'. |
format |
Article in Journal/Newspaper |
author |
Andren, E Brand, Tim Shimmield, Graham B |
author_facet |
Andren, E Brand, Tim Shimmield, Graham B |
author_sort |
Andren, E |
title |
Environmental changes of the last three centuries indicated by siliceous microfossil records from the southwestern Baltic Sea |
title_short |
Environmental changes of the last three centuries indicated by siliceous microfossil records from the southwestern Baltic Sea |
title_full |
Environmental changes of the last three centuries indicated by siliceous microfossil records from the southwestern Baltic Sea |
title_fullStr |
Environmental changes of the last three centuries indicated by siliceous microfossil records from the southwestern Baltic Sea |
title_full_unstemmed |
Environmental changes of the last three centuries indicated by siliceous microfossil records from the southwestern Baltic Sea |
title_sort |
environmental changes of the last three centuries indicated by siliceous microfossil records from the southwestern baltic sea |
publishDate |
1999 |
url |
https://pure.uhi.ac.uk/en/publications/6fecc617-afdd-4cd0-9dc1-1e3efdb1ea4b |
genre |
Sea ice |
genre_facet |
Sea ice |
op_source |
Andren , E , Brand , T & Shimmield , G B 1999 , ' Environmental changes of the last three centuries indicated by siliceous microfossil records from the southwestern Baltic Sea ' , Holocene , vol. 9 , no. 1 , pp. 25-38 . |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1789972937199058944 |