Cladocerean and diatom stratigraphy of calcareous lake sediments from Kuusamo, NE Finland. Indications of Holocene lake-level changes
Cores of Holocene calcareous sediments (marls) from two small lakes (Putaanlampi and Ylimmäinen Kuivajärvi) in Kuusamo, NE Finland, were analysed for pollen, Cladocera, and diatoms. The cladoceran planktonic / littoral ratio shows consistent trends through the Holocene, with parallel changes at both...
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1999
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fttsvojs:oai:journal.fi:article/8933 2023-05-15T16:11:56+02:00 Cladocerean and diatom stratigraphy of calcareous lake sediments from Kuusamo, NE Finland. Indications of Holocene lake-level changes Sarmaja-Korhonen, Kaarina Hyvärinen, Hannu 1999-01-01 https://fennia.journal.fi/article/view/8933 en eng Geographical Society of Finland https://fennia.journal.fi/article/view/8933 Copyright (c) 2014 Fennia Fennia; Vol 177 Nro 1 (1999); 55-70 Fennia - International Journal of Geography; Vol 177 No 1 (1999); 55-70 1798-5617 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 1999 fttsvojs 2020-09-30T22:46:09Z Cores of Holocene calcareous sediments (marls) from two small lakes (Putaanlampi and Ylimmäinen Kuivajärvi) in Kuusamo, NE Finland, were analysed for pollen, Cladocera, and diatoms. The cladoceran planktonic / littoral ratio shows consistent trends through the Holocene, with parallel changes at both sites, suggesting regional changes in water balance and lake levels. The diatoms were extensively dissolved, but the down-core occurrence of remains of several mesohalobous taxa absent from the younger sediments indicates that the lakes must have undergone stages of elevated eletrolyte concentration and, by inference, enhanced evaporation earlier in their history. The results are interpreted as indicating relatively dry conditions between 7000 and 5000 BP, with maximal dryness occurring around 6000 BP. The mid-Holocene dry interval is preceded and succeeded by periods of more humid conditions and higher lake levels. This pattern of Holocene humidity changes in NE Finland is closely comparable with the patterns previously suggested for Finnish Lapland and for south-central Sweden, but deviates from the pattern known from the southern parts of Fennoscandia. Article in Journal/Newspaper Fennoscandia Lapland Federation of Finnish Learned Societies: Scientific Journals Online Kuivajärvi ENVELOPE(26.350,26.350,68.767,68.767) Kuusamo ENVELOPE(29.183,29.183,65.967,65.967) |
institution |
Open Polar |
collection |
Federation of Finnish Learned Societies: Scientific Journals Online |
op_collection_id |
fttsvojs |
language |
English |
description |
Cores of Holocene calcareous sediments (marls) from two small lakes (Putaanlampi and Ylimmäinen Kuivajärvi) in Kuusamo, NE Finland, were analysed for pollen, Cladocera, and diatoms. The cladoceran planktonic / littoral ratio shows consistent trends through the Holocene, with parallel changes at both sites, suggesting regional changes in water balance and lake levels. The diatoms were extensively dissolved, but the down-core occurrence of remains of several mesohalobous taxa absent from the younger sediments indicates that the lakes must have undergone stages of elevated eletrolyte concentration and, by inference, enhanced evaporation earlier in their history. The results are interpreted as indicating relatively dry conditions between 7000 and 5000 BP, with maximal dryness occurring around 6000 BP. The mid-Holocene dry interval is preceded and succeeded by periods of more humid conditions and higher lake levels. This pattern of Holocene humidity changes in NE Finland is closely comparable with the patterns previously suggested for Finnish Lapland and for south-central Sweden, but deviates from the pattern known from the southern parts of Fennoscandia. |
format |
Article in Journal/Newspaper |
author |
Sarmaja-Korhonen, Kaarina Hyvärinen, Hannu |
spellingShingle |
Sarmaja-Korhonen, Kaarina Hyvärinen, Hannu Cladocerean and diatom stratigraphy of calcareous lake sediments from Kuusamo, NE Finland. Indications of Holocene lake-level changes |
author_facet |
Sarmaja-Korhonen, Kaarina Hyvärinen, Hannu |
author_sort |
Sarmaja-Korhonen, Kaarina |
title |
Cladocerean and diatom stratigraphy of calcareous lake sediments from Kuusamo, NE Finland. Indications of Holocene lake-level changes |
title_short |
Cladocerean and diatom stratigraphy of calcareous lake sediments from Kuusamo, NE Finland. Indications of Holocene lake-level changes |
title_full |
Cladocerean and diatom stratigraphy of calcareous lake sediments from Kuusamo, NE Finland. Indications of Holocene lake-level changes |
title_fullStr |
Cladocerean and diatom stratigraphy of calcareous lake sediments from Kuusamo, NE Finland. Indications of Holocene lake-level changes |
title_full_unstemmed |
Cladocerean and diatom stratigraphy of calcareous lake sediments from Kuusamo, NE Finland. Indications of Holocene lake-level changes |
title_sort |
cladocerean and diatom stratigraphy of calcareous lake sediments from kuusamo, ne finland. indications of holocene lake-level changes |
publisher |
Geographical Society of Finland |
publishDate |
1999 |
url |
https://fennia.journal.fi/article/view/8933 |
long_lat |
ENVELOPE(26.350,26.350,68.767,68.767) ENVELOPE(29.183,29.183,65.967,65.967) |
geographic |
Kuivajärvi Kuusamo |
geographic_facet |
Kuivajärvi Kuusamo |
genre |
Fennoscandia Lapland |
genre_facet |
Fennoscandia Lapland |
op_source |
Fennia; Vol 177 Nro 1 (1999); 55-70 Fennia - International Journal of Geography; Vol 177 No 1 (1999); 55-70 1798-5617 |
op_relation |
https://fennia.journal.fi/article/view/8933 |
op_rights |
Copyright (c) 2014 Fennia |
_version_ |
1765997145482067968 |