Neoglacial lake-ecosystem changes above and below the subarctic Fennoscandian treeline inferred from changes in diatom functional groups
Algal communities act as sensitive indicators of past and present climate effects on northern lakes, but their responses can vary considerably between ecosystems. Functional trait-based approaches may help us better understand the nature of the diverse biotic responses and their underlying ecosystem...
Published in: | Journal of Paleolimnology |
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Main Authors: | , , , , , , |
Other Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Springer
2023
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Subjects: | |
Online Access: | http://hdl.handle.net/10138/356086 |
id |
ftunivhelsihelda:oai:helda.helsinki.fi:10138/356086 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
HELDA – University of Helsinki Open Repository |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
Climate change Growth form Lake sediment Neoglacial cooling Substrate Underwater light ORGANIC-CARBON ULTRAVIOLET-RADIATION ECOLOGICAL GUILDS BENTHIC ALGAE COMMUNITY COMPOSITION CLIMATIC-CHANGE REGIME-SHIFTS TROPHIC-LEVEL ISLAND WATER 1172 Environmental sciences 1181 Ecology evolutionary biology |
spellingShingle |
Climate change Growth form Lake sediment Neoglacial cooling Substrate Underwater light ORGANIC-CARBON ULTRAVIOLET-RADIATION ECOLOGICAL GUILDS BENTHIC ALGAE COMMUNITY COMPOSITION CLIMATIC-CHANGE REGIME-SHIFTS TROPHIC-LEVEL ISLAND WATER 1172 Environmental sciences 1181 Ecology evolutionary biology Rantala, Marttiina Kivila, E. Henriikka Meyer-Jacob, Carsten Atti, Sanna Luoto, Tomi P. Smol, John P. Nevalainen, Liisa Neoglacial lake-ecosystem changes above and below the subarctic Fennoscandian treeline inferred from changes in diatom functional groups |
topic_facet |
Climate change Growth form Lake sediment Neoglacial cooling Substrate Underwater light ORGANIC-CARBON ULTRAVIOLET-RADIATION ECOLOGICAL GUILDS BENTHIC ALGAE COMMUNITY COMPOSITION CLIMATIC-CHANGE REGIME-SHIFTS TROPHIC-LEVEL ISLAND WATER 1172 Environmental sciences 1181 Ecology evolutionary biology |
description |
Algal communities act as sensitive indicators of past and present climate effects on northern lakes, but their responses can vary considerably between ecosystems. Functional trait-based approaches may help us better understand the nature of the diverse biotic responses and their underlying ecosystem changes. We explored patterns in diatom (Bacillariophyceae) growth forms and species composition during the Neoglacial in two shallow lakes typical of subarctic regions, including a dark-colored woodland lake and a clear tundra lake. Sediment carbon and nitrogen elemental and isotope biogeochemistry and spectral indices were used to track broadscale changes in lake productivity, the inflow of organic carbon from land, and benthic substratum over the past three millennia. The biogeochemical indices tracked declines in land-lake connectivity as well as lake-water and sediment organic enrichment above and below the subarctic treeline driven by Neoglacial cooling. This broadscale environmental transition was intercepted by periods of elevated primary production associated with transient Neoglacial warm anomalies and, in particular, the twentieth century warming. Although the Neoglacial development of the lakes showed conspicuous similarities, diatom functional and taxonomic responses were not uniform between the lakes pointing to intrinsic differences in the development of benthic habitats and underwater-light regimes. Many of the observed biotic shifts aligned with expectations based on earlier research linking diatom functional traits to changing light and organic levels but the results also point to further research needs, particularly to better differentiate the individual and interactive effects of substratum and light. Despite distinct anthropogenic imprints in the biogeochemical record, the scale of human impact on the lakes' biota has not, as yet, been profound, but the changes are nonetheless clear when compared to the previous three millennia of natural lake development. Peer reviewed |
author2 |
Ecosystems and Environment Research Programme Department of Geosciences and Geography |
format |
Article in Journal/Newspaper |
author |
Rantala, Marttiina Kivila, E. Henriikka Meyer-Jacob, Carsten Atti, Sanna Luoto, Tomi P. Smol, John P. Nevalainen, Liisa |
author_facet |
Rantala, Marttiina Kivila, E. Henriikka Meyer-Jacob, Carsten Atti, Sanna Luoto, Tomi P. Smol, John P. Nevalainen, Liisa |
author_sort |
Rantala, Marttiina |
title |
Neoglacial lake-ecosystem changes above and below the subarctic Fennoscandian treeline inferred from changes in diatom functional groups |
title_short |
Neoglacial lake-ecosystem changes above and below the subarctic Fennoscandian treeline inferred from changes in diatom functional groups |
title_full |
Neoglacial lake-ecosystem changes above and below the subarctic Fennoscandian treeline inferred from changes in diatom functional groups |
title_fullStr |
Neoglacial lake-ecosystem changes above and below the subarctic Fennoscandian treeline inferred from changes in diatom functional groups |
title_full_unstemmed |
Neoglacial lake-ecosystem changes above and below the subarctic Fennoscandian treeline inferred from changes in diatom functional groups |
title_sort |
neoglacial lake-ecosystem changes above and below the subarctic fennoscandian treeline inferred from changes in diatom functional groups |
publisher |
Springer |
publishDate |
2023 |
url |
http://hdl.handle.net/10138/356086 |
long_lat |
ENVELOPE(177.304,177.304,51.864,51.864) |
geographic |
Form Lake |
geographic_facet |
Form Lake |
genre |
Fennoscandian Subarctic Tundra |
genre_facet |
Fennoscandian Subarctic Tundra |
op_relation |
10.1007/s10933-022-00272-7 This study was funded by the Academy of Finland (Grants #308954, #314107, #335317) and the Kone Foundation (Grant #090140). We are grateful to the staff of the Kilpisjarvi Biological Station (University of Helsinki) for their valuable assistance during field work. We thank Xavier Benito and an anonymous reviewer for their thoughtful comments. Rantala , M , Kivila , E H , Meyer-Jacob , C , Atti , S , Luoto , T P , Smol , J P & Nevalainen , L 2023 , ' Neoglacial lake-ecosystem changes above and below the subarctic Fennoscandian treeline inferred from changes in diatom functional groups ' , Journal of Paleolimnology , vol. 69 , no. 3 , pp. 267–291 . https://doi.org/10.1007/s10933-022-00272-7 ORCID: /0000-0001-6925-3688/work/130598370 ORCID: /0000-0002-3231-5926/work/130604733 ORCID: /0000-0001-6837-8753/work/130605765 ORCID: /0000-0003-4481-3815/work/130606412 bd68412f-70ad-407a-b1be-a7e3ab2c96e7 http://hdl.handle.net/10138/356086 000877997600001 |
op_rights |
openAccess info:eu-repo/semantics/openAccess |
container_title |
Journal of Paleolimnology |
container_volume |
69 |
container_issue |
3 |
container_start_page |
267 |
op_container_end_page |
291 |
_version_ |
1787424466859458560 |
spelling |
ftunivhelsihelda:oai:helda.helsinki.fi:10138/356086 2024-01-07T09:43:12+01:00 Neoglacial lake-ecosystem changes above and below the subarctic Fennoscandian treeline inferred from changes in diatom functional groups Rantala, Marttiina Kivila, E. Henriikka Meyer-Jacob, Carsten Atti, Sanna Luoto, Tomi P. Smol, John P. Nevalainen, Liisa Ecosystems and Environment Research Programme Department of Geosciences and Geography 2023-03-10T14:48:01Z 25 application/pdf http://hdl.handle.net/10138/356086 eng eng Springer 10.1007/s10933-022-00272-7 This study was funded by the Academy of Finland (Grants #308954, #314107, #335317) and the Kone Foundation (Grant #090140). We are grateful to the staff of the Kilpisjarvi Biological Station (University of Helsinki) for their valuable assistance during field work. We thank Xavier Benito and an anonymous reviewer for their thoughtful comments. Rantala , M , Kivila , E H , Meyer-Jacob , C , Atti , S , Luoto , T P , Smol , J P & Nevalainen , L 2023 , ' Neoglacial lake-ecosystem changes above and below the subarctic Fennoscandian treeline inferred from changes in diatom functional groups ' , Journal of Paleolimnology , vol. 69 , no. 3 , pp. 267–291 . https://doi.org/10.1007/s10933-022-00272-7 ORCID: /0000-0001-6925-3688/work/130598370 ORCID: /0000-0002-3231-5926/work/130604733 ORCID: /0000-0001-6837-8753/work/130605765 ORCID: /0000-0003-4481-3815/work/130606412 bd68412f-70ad-407a-b1be-a7e3ab2c96e7 http://hdl.handle.net/10138/356086 000877997600001 openAccess info:eu-repo/semantics/openAccess Climate change Growth form Lake sediment Neoglacial cooling Substrate Underwater light ORGANIC-CARBON ULTRAVIOLET-RADIATION ECOLOGICAL GUILDS BENTHIC ALGAE COMMUNITY COMPOSITION CLIMATIC-CHANGE REGIME-SHIFTS TROPHIC-LEVEL ISLAND WATER 1172 Environmental sciences 1181 Ecology evolutionary biology Article publishedVersion 2023 ftunivhelsihelda 2023-12-14T00:01:35Z Algal communities act as sensitive indicators of past and present climate effects on northern lakes, but their responses can vary considerably between ecosystems. Functional trait-based approaches may help us better understand the nature of the diverse biotic responses and their underlying ecosystem changes. We explored patterns in diatom (Bacillariophyceae) growth forms and species composition during the Neoglacial in two shallow lakes typical of subarctic regions, including a dark-colored woodland lake and a clear tundra lake. Sediment carbon and nitrogen elemental and isotope biogeochemistry and spectral indices were used to track broadscale changes in lake productivity, the inflow of organic carbon from land, and benthic substratum over the past three millennia. The biogeochemical indices tracked declines in land-lake connectivity as well as lake-water and sediment organic enrichment above and below the subarctic treeline driven by Neoglacial cooling. This broadscale environmental transition was intercepted by periods of elevated primary production associated with transient Neoglacial warm anomalies and, in particular, the twentieth century warming. Although the Neoglacial development of the lakes showed conspicuous similarities, diatom functional and taxonomic responses were not uniform between the lakes pointing to intrinsic differences in the development of benthic habitats and underwater-light regimes. Many of the observed biotic shifts aligned with expectations based on earlier research linking diatom functional traits to changing light and organic levels but the results also point to further research needs, particularly to better differentiate the individual and interactive effects of substratum and light. Despite distinct anthropogenic imprints in the biogeochemical record, the scale of human impact on the lakes' biota has not, as yet, been profound, but the changes are nonetheless clear when compared to the previous three millennia of natural lake development. Peer reviewed Article in Journal/Newspaper Fennoscandian Subarctic Tundra HELDA – University of Helsinki Open Repository Form Lake ENVELOPE(177.304,177.304,51.864,51.864) Journal of Paleolimnology 69 3 267 291 |