Changes of emergent aquatic macrophyte cover in seven large boreal lakes in Finland with special reference to water level regulation
The latest studies on the development of aquatic vegetation in Finland have mainly focused on relatively small lakes. Research on emergent macrophytes in large lakes poses challenges as the habitats as well as the conditions of the lakes vary. Black and white aerial photographs from 1947–1963 and co...
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Geographical Society of Finland
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fttsvojs:oai:journal.fi:article/3738 2023-05-15T17:01:53+02:00 Changes of emergent aquatic macrophyte cover in seven large boreal lakes in Finland with special reference to water level regulation Partanen, Sari Hellsten, Seppo 2005-01-01 application/pdf https://fennia.journal.fi/article/view/3738 eng eng Geographical Society of Finland https://fennia.journal.fi/article/view/3738/3529 https://fennia.journal.fi/article/view/3738 Copyright (c) 2014 Fennia Fennia; Vol 183 Nro 1 (2005); 57-79 Fennia - International Journal of Geography; Vol 183 No 1 (2005); 57-79 1798-5617 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2005 fttsvojs 2020-09-30T22:46:00Z The latest studies on the development of aquatic vegetation in Finland have mainly focused on relatively small lakes. Research on emergent macrophytes in large lakes poses challenges as the habitats as well as the conditions of the lakes vary. Black and white aerial photographs from 1947–1963 and colour, mainly infrared aerial photographs from 1996–2000 were used to study quantitative vegetation changes in seven large (80–1116 km2) lakes in Finland: Kemijärvi, Unnukka, Kallavesi, Päijänne, Näsijärvi, Pyhäjärvi and Vanajavesi. Vegetation changes were evaluated by comparing the situation before large-scale water level regulation and eutrophication to the current situation. Quantitative changes in emergent vegetation were frequently noticeable. Vegetation had decreased by 31–93% in three study lakes due to the mean water level rise and increased by 49–73% in three study lakes due to the spring flood reduction and suitable surrounding soils. The cover changes were in general relatively uniform between different study sites in each of the study lakes. The regulated and unregulated situations differed statistically from each other. The results point out the crucial impact of changing water levels and the significance of the surrounding soils to the cover of emergent aquatic vegetation. Article in Journal/Newspaper Kemijärvi Federation of Finnish Learned Societies: Scientific Journals Online |
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Federation of Finnish Learned Societies: Scientific Journals Online |
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fttsvojs |
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English |
description |
The latest studies on the development of aquatic vegetation in Finland have mainly focused on relatively small lakes. Research on emergent macrophytes in large lakes poses challenges as the habitats as well as the conditions of the lakes vary. Black and white aerial photographs from 1947–1963 and colour, mainly infrared aerial photographs from 1996–2000 were used to study quantitative vegetation changes in seven large (80–1116 km2) lakes in Finland: Kemijärvi, Unnukka, Kallavesi, Päijänne, Näsijärvi, Pyhäjärvi and Vanajavesi. Vegetation changes were evaluated by comparing the situation before large-scale water level regulation and eutrophication to the current situation. Quantitative changes in emergent vegetation were frequently noticeable. Vegetation had decreased by 31–93% in three study lakes due to the mean water level rise and increased by 49–73% in three study lakes due to the spring flood reduction and suitable surrounding soils. The cover changes were in general relatively uniform between different study sites in each of the study lakes. The regulated and unregulated situations differed statistically from each other. The results point out the crucial impact of changing water levels and the significance of the surrounding soils to the cover of emergent aquatic vegetation. |
format |
Article in Journal/Newspaper |
author |
Partanen, Sari Hellsten, Seppo |
spellingShingle |
Partanen, Sari Hellsten, Seppo Changes of emergent aquatic macrophyte cover in seven large boreal lakes in Finland with special reference to water level regulation |
author_facet |
Partanen, Sari Hellsten, Seppo |
author_sort |
Partanen, Sari |
title |
Changes of emergent aquatic macrophyte cover in seven large boreal lakes in Finland with special reference to water level regulation |
title_short |
Changes of emergent aquatic macrophyte cover in seven large boreal lakes in Finland with special reference to water level regulation |
title_full |
Changes of emergent aquatic macrophyte cover in seven large boreal lakes in Finland with special reference to water level regulation |
title_fullStr |
Changes of emergent aquatic macrophyte cover in seven large boreal lakes in Finland with special reference to water level regulation |
title_full_unstemmed |
Changes of emergent aquatic macrophyte cover in seven large boreal lakes in Finland with special reference to water level regulation |
title_sort |
changes of emergent aquatic macrophyte cover in seven large boreal lakes in finland with special reference to water level regulation |
publisher |
Geographical Society of Finland |
publishDate |
2005 |
url |
https://fennia.journal.fi/article/view/3738 |
genre |
Kemijärvi |
genre_facet |
Kemijärvi |
op_source |
Fennia; Vol 183 Nro 1 (2005); 57-79 Fennia - International Journal of Geography; Vol 183 No 1 (2005); 57-79 1798-5617 |
op_relation |
https://fennia.journal.fi/article/view/3738/3529 https://fennia.journal.fi/article/view/3738 |
op_rights |
Copyright (c) 2014 Fennia |
_version_ |
1766055066183139328 |