Changes of treelines and alpine vegetation in relation to post‐glacial climate dynamics in northern Fennoscandia based on pollen and chironomid records
Abstract Palaeoclimatic records derived from a variety of independent proxies provide evidence of post‐glacial changes of temperature and soil moisture in northern Fennoscandia. We use pollen percentage, pollen influx, stomatal and chironomid records from Toskaljavri, a high‐altitude lake in norther...
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crwiley:10.1002/jqs.678 2024-06-02T08:06:27+00:00 Changes of treelines and alpine vegetation in relation to post‐glacial climate dynamics in northern Fennoscandia based on pollen and chironomid records Seppä, Heikki Nyman, Marjut Korhola, Atte Weckström, Jan European Community Environment and Climate Research Programme Academy of Finland. 2002 http://dx.doi.org/10.1002/jqs.678 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.678 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.678 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 17, issue 4, page 287-301 ISSN 0267-8179 1099-1417 journal-article 2002 crwiley https://doi.org/10.1002/jqs.678 2024-05-03T11:36:56Z Abstract Palaeoclimatic records derived from a variety of independent proxies provide evidence of post‐glacial changes of temperature and soil moisture in northern Fennoscandia. We use pollen percentage, pollen influx, stomatal and chironomid records from Toskaljavri, a high‐altitude lake in northern Finland, to assess how treelines and alpine vegetation there have responded to these climate changes. The evidence suggests that the cool, moist climate of the early Holocene supported birch forest in the area 9600 cal. yr BP onwards and that a rise of temperature triggered the immigration of pine at 8300 cal. yr BP. At 6100–4000 cal. yr BP altitudinal treeline in the area was formed by pine, in contrast to the modern situation where mountain birch reaches a higher elevation. Alpine vegetation also demonstrates clear changes. Plant communities typical of dry, oligotrophic heaths of northern Fennoscandia expanded during the dry climatic period at 7000–4000 cal. yr BP and decreased in response to cooler and moister conditions after 4000 cal. yr BP. Alpine plant communities favouring moist sites show an inverse pattern, expanding after a change towards moister climate after 4000 cal. yr BP. In a redundancy analysis (RDA), a statistically significant proportion of the variability in the total chironomid assemblages was captured by changes in the pollen types reflecting alpine vegetation typical of moist sites. Although chironomid community changes appeared to follow the major patterns in the alpine vegetation succession, the present study does not support a direct link between the changing treeline position and chironomid stratigraphy. Rather, the data indicate that the terrestrial and aquatic environments have each responded directly to the same ultimate cause, namely changing Holocene climate. Copyright © 2002 John Wiley & Sons, Ltd. Article in Journal/Newspaper Fennoscandia Northern Finland Wiley Online Library Journal of Quaternary Science 17 4 287 301 |
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Wiley Online Library |
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crwiley |
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English |
description |
Abstract Palaeoclimatic records derived from a variety of independent proxies provide evidence of post‐glacial changes of temperature and soil moisture in northern Fennoscandia. We use pollen percentage, pollen influx, stomatal and chironomid records from Toskaljavri, a high‐altitude lake in northern Finland, to assess how treelines and alpine vegetation there have responded to these climate changes. The evidence suggests that the cool, moist climate of the early Holocene supported birch forest in the area 9600 cal. yr BP onwards and that a rise of temperature triggered the immigration of pine at 8300 cal. yr BP. At 6100–4000 cal. yr BP altitudinal treeline in the area was formed by pine, in contrast to the modern situation where mountain birch reaches a higher elevation. Alpine vegetation also demonstrates clear changes. Plant communities typical of dry, oligotrophic heaths of northern Fennoscandia expanded during the dry climatic period at 7000–4000 cal. yr BP and decreased in response to cooler and moister conditions after 4000 cal. yr BP. Alpine plant communities favouring moist sites show an inverse pattern, expanding after a change towards moister climate after 4000 cal. yr BP. In a redundancy analysis (RDA), a statistically significant proportion of the variability in the total chironomid assemblages was captured by changes in the pollen types reflecting alpine vegetation typical of moist sites. Although chironomid community changes appeared to follow the major patterns in the alpine vegetation succession, the present study does not support a direct link between the changing treeline position and chironomid stratigraphy. Rather, the data indicate that the terrestrial and aquatic environments have each responded directly to the same ultimate cause, namely changing Holocene climate. Copyright © 2002 John Wiley & Sons, Ltd. |
author2 |
European Community Environment and Climate Research Programme Academy of Finland. |
format |
Article in Journal/Newspaper |
author |
Seppä, Heikki Nyman, Marjut Korhola, Atte Weckström, Jan |
spellingShingle |
Seppä, Heikki Nyman, Marjut Korhola, Atte Weckström, Jan Changes of treelines and alpine vegetation in relation to post‐glacial climate dynamics in northern Fennoscandia based on pollen and chironomid records |
author_facet |
Seppä, Heikki Nyman, Marjut Korhola, Atte Weckström, Jan |
author_sort |
Seppä, Heikki |
title |
Changes of treelines and alpine vegetation in relation to post‐glacial climate dynamics in northern Fennoscandia based on pollen and chironomid records |
title_short |
Changes of treelines and alpine vegetation in relation to post‐glacial climate dynamics in northern Fennoscandia based on pollen and chironomid records |
title_full |
Changes of treelines and alpine vegetation in relation to post‐glacial climate dynamics in northern Fennoscandia based on pollen and chironomid records |
title_fullStr |
Changes of treelines and alpine vegetation in relation to post‐glacial climate dynamics in northern Fennoscandia based on pollen and chironomid records |
title_full_unstemmed |
Changes of treelines and alpine vegetation in relation to post‐glacial climate dynamics in northern Fennoscandia based on pollen and chironomid records |
title_sort |
changes of treelines and alpine vegetation in relation to post‐glacial climate dynamics in northern fennoscandia based on pollen and chironomid records |
publisher |
Wiley |
publishDate |
2002 |
url |
http://dx.doi.org/10.1002/jqs.678 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.678 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.678 |
genre |
Fennoscandia Northern Finland |
genre_facet |
Fennoscandia Northern Finland |
op_source |
Journal of Quaternary Science volume 17, issue 4, page 287-301 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.678 |
container_title |
Journal of Quaternary Science |
container_volume |
17 |
container_issue |
4 |
container_start_page |
287 |
op_container_end_page |
301 |
_version_ |
1800751401590063104 |