Diatom blooms and associated vegetation shifts in a subarctic peatland: responses to distant volcanic eruptions?
ABSTRACT We test the hypothesis that rich occurrences of diatoms observed at transitions between major peat units representing different vegetation communities in a peat sequence from subarctic northern Sweden reflect responses to acid deposition from the Samalas AD 1257 and Laki AD 1783/1784 erupti...
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Online Access: | http://dx.doi.org/10.1002/jqs.2898 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2898 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2898 |
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crwiley:10.1002/jqs.2898 2024-06-02T08:08:03+00:00 Diatom blooms and associated vegetation shifts in a subarctic peatland: responses to distant volcanic eruptions? Kokfelt, U. Muscheler, R. Mellström, A. Struyf, E. Rundgren, M. Wastegård, S. Hammarlund, D. Swedish Research Council 2016 http://dx.doi.org/10.1002/jqs.2898 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2898 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2898 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Quaternary Science volume 31, issue 7, page 723-730 ISSN 0267-8179 1099-1417 journal-article 2016 crwiley https://doi.org/10.1002/jqs.2898 2024-05-03T11:39:05Z ABSTRACT We test the hypothesis that rich occurrences of diatoms observed at transitions between major peat units representing different vegetation communities in a peat sequence from subarctic northern Sweden reflect responses to acid deposition from the Samalas AD 1257 and Laki AD 1783/1784 eruptions. We observe sudden changes in the mire ecosystem and thereby in the trophic status and biogeochemical cycling of the peatland. Both the eruptions are known to have been associated with significant acid deposition events and climatic anomalies, as recorded in polar ice cores. To test the hypothesis, new chronological analyses and age modelling were applied to existing biogeochemical and biological records from the peat sequence. This approach yielded modelled age ranges of AD 1239–1284 (1σ)/AD 1210–1303 (2σ) (median: AD 1260) and AD 1674–1795 (1σ)/AD 1665–1875 (2σ) (median AD 1743), respectively, for the stratigraphic transitions. Hence, the modelled age ranges bracket the ages of the eruptions in question and the hypothesis could therefore not be rejected. Impacts of acid deposition from the eruptions are assumed to have caused instant acidification, vegetation damage, increased nutrient cycling and blooms of opportunistic epiphytic diatoms. In addition, cooling may have contributed to vegetation changes through permafrost inception, frost heave and thereby altered hydrological conditions. Article in Journal/Newspaper Ice Northern Sweden permafrost Subarctic Wiley Online Library Laki ENVELOPE(-18.237,-18.237,64.070,64.070) Journal of Quaternary Science 31 7 723 730 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT We test the hypothesis that rich occurrences of diatoms observed at transitions between major peat units representing different vegetation communities in a peat sequence from subarctic northern Sweden reflect responses to acid deposition from the Samalas AD 1257 and Laki AD 1783/1784 eruptions. We observe sudden changes in the mire ecosystem and thereby in the trophic status and biogeochemical cycling of the peatland. Both the eruptions are known to have been associated with significant acid deposition events and climatic anomalies, as recorded in polar ice cores. To test the hypothesis, new chronological analyses and age modelling were applied to existing biogeochemical and biological records from the peat sequence. This approach yielded modelled age ranges of AD 1239–1284 (1σ)/AD 1210–1303 (2σ) (median: AD 1260) and AD 1674–1795 (1σ)/AD 1665–1875 (2σ) (median AD 1743), respectively, for the stratigraphic transitions. Hence, the modelled age ranges bracket the ages of the eruptions in question and the hypothesis could therefore not be rejected. Impacts of acid deposition from the eruptions are assumed to have caused instant acidification, vegetation damage, increased nutrient cycling and blooms of opportunistic epiphytic diatoms. In addition, cooling may have contributed to vegetation changes through permafrost inception, frost heave and thereby altered hydrological conditions. |
author2 |
Swedish Research Council |
format |
Article in Journal/Newspaper |
author |
Kokfelt, U. Muscheler, R. Mellström, A. Struyf, E. Rundgren, M. Wastegård, S. Hammarlund, D. |
spellingShingle |
Kokfelt, U. Muscheler, R. Mellström, A. Struyf, E. Rundgren, M. Wastegård, S. Hammarlund, D. Diatom blooms and associated vegetation shifts in a subarctic peatland: responses to distant volcanic eruptions? |
author_facet |
Kokfelt, U. Muscheler, R. Mellström, A. Struyf, E. Rundgren, M. Wastegård, S. Hammarlund, D. |
author_sort |
Kokfelt, U. |
title |
Diatom blooms and associated vegetation shifts in a subarctic peatland: responses to distant volcanic eruptions? |
title_short |
Diatom blooms and associated vegetation shifts in a subarctic peatland: responses to distant volcanic eruptions? |
title_full |
Diatom blooms and associated vegetation shifts in a subarctic peatland: responses to distant volcanic eruptions? |
title_fullStr |
Diatom blooms and associated vegetation shifts in a subarctic peatland: responses to distant volcanic eruptions? |
title_full_unstemmed |
Diatom blooms and associated vegetation shifts in a subarctic peatland: responses to distant volcanic eruptions? |
title_sort |
diatom blooms and associated vegetation shifts in a subarctic peatland: responses to distant volcanic eruptions? |
publisher |
Wiley |
publishDate |
2016 |
url |
http://dx.doi.org/10.1002/jqs.2898 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjqs.2898 https://onlinelibrary.wiley.com/doi/pdf/10.1002/jqs.2898 |
long_lat |
ENVELOPE(-18.237,-18.237,64.070,64.070) |
geographic |
Laki |
geographic_facet |
Laki |
genre |
Ice Northern Sweden permafrost Subarctic |
genre_facet |
Ice Northern Sweden permafrost Subarctic |
op_source |
Journal of Quaternary Science volume 31, issue 7, page 723-730 ISSN 0267-8179 1099-1417 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/jqs.2898 |
container_title |
Journal of Quaternary Science |
container_volume |
31 |
container_issue |
7 |
container_start_page |
723 |
op_container_end_page |
730 |
_version_ |
1800753209733545984 |