Diatom response to mid-Holocene climate in three small Arctic lakes in northernmost Finnmark
Palaeoclimatic reconstructions from lake sediment biological records can be challenging, due to variation in non-climatic factors, which alter ecosystem responses. To consider this, it is important to replicate a study regionally, so as to gain information on spatial variability of ecosystem respons...
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crsagepubl:10.1177/0959683615572853 2024-10-13T14:05:18+00:00 Diatom response to mid-Holocene climate in three small Arctic lakes in northernmost Finnmark Roberts, Sarah Jones, Viv J Allen, Judy RM Huntley, Brian 2015 http://dx.doi.org/10.1177/0959683615572853 https://journals.sagepub.com/doi/pdf/10.1177/0959683615572853 https://journals.sagepub.com/doi/full-xml/10.1177/0959683615572853 en eng SAGE Publications https://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 25, issue 6, page 911-920 ISSN 0959-6836 1477-0911 journal-article 2015 crsagepubl https://doi.org/10.1177/0959683615572853 2024-09-24T04:13:54Z Palaeoclimatic reconstructions from lake sediment biological records can be challenging, due to variation in non-climatic factors, which alter ecosystem responses. To consider this, it is important to replicate a study regionally, so as to gain information on spatial variability of ecosystem response and the influence of site-specific conditions. Previous pollen-based palaeoclimatic records from three well-dated Arctic lake sites highlight the response of regional Scots Pine ( Pinus sylvestris) and Mountain Birch ( Betula pubescens ssp. czerepanovii) forest-tundra transition to Holocene climatic variability and suggest the northernmost Peninsulas of Finnmark to be climatically sensitive. This study analysed dated sediment sequences between c. 3970 and c. 6200 cal. yr BP from these three previously published shallow lakes: Liten Čap’pesjav’ri (LCJ), over Gunnarsfjorden (OGF) and over Kobbkrokvatnet (OKV), for freshwater diatoms. Diatom assemblages showed an increase in the planktonic diatoms relative to benthic diatoms, with an onset towards higher abundances of small centric planktonic diatoms at OGF (between c. 5270 and 5350 cal. yr BP) and OKV (between c. 5280 and 5350 cal. yr BP). Additionally, a diatom compositional shift was detected at LCJ between c. 5180 and 5300 cal. yr BP. Trend analysis found the main diatom compositional change at all three sites to occur at 5300 cal. yr BP. However, this synchronous diatom shift during the mid-Holocene varies in magnitude within the three Finnmark lakes. The abrupt planktonic:benthic diatom ratio changes are independent of the Pinus:Betula ratios and are likely to be a result of lake ice-cover changes, allowing longer growing seasons, greater water column stability and higher nutrient concentrations from surrounding catchments. This study highlights the significant differences in aquatic ecosystem and terrestrial vegetation response to climatic changes, with diatom assemblages at these sites either responding before the regional tree-line shift or to a separate ... Article in Journal/Newspaper Arctic Finnmark Tundra Finnmark SAGE Publications Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Gunnarsfjorden ENVELOPE(28.184,28.184,71.033,71.033) The Holocene 25 6 911 920 |
institution |
Open Polar |
collection |
SAGE Publications |
op_collection_id |
crsagepubl |
language |
English |
description |
Palaeoclimatic reconstructions from lake sediment biological records can be challenging, due to variation in non-climatic factors, which alter ecosystem responses. To consider this, it is important to replicate a study regionally, so as to gain information on spatial variability of ecosystem response and the influence of site-specific conditions. Previous pollen-based palaeoclimatic records from three well-dated Arctic lake sites highlight the response of regional Scots Pine ( Pinus sylvestris) and Mountain Birch ( Betula pubescens ssp. czerepanovii) forest-tundra transition to Holocene climatic variability and suggest the northernmost Peninsulas of Finnmark to be climatically sensitive. This study analysed dated sediment sequences between c. 3970 and c. 6200 cal. yr BP from these three previously published shallow lakes: Liten Čap’pesjav’ri (LCJ), over Gunnarsfjorden (OGF) and over Kobbkrokvatnet (OKV), for freshwater diatoms. Diatom assemblages showed an increase in the planktonic diatoms relative to benthic diatoms, with an onset towards higher abundances of small centric planktonic diatoms at OGF (between c. 5270 and 5350 cal. yr BP) and OKV (between c. 5280 and 5350 cal. yr BP). Additionally, a diatom compositional shift was detected at LCJ between c. 5180 and 5300 cal. yr BP. Trend analysis found the main diatom compositional change at all three sites to occur at 5300 cal. yr BP. However, this synchronous diatom shift during the mid-Holocene varies in magnitude within the three Finnmark lakes. The abrupt planktonic:benthic diatom ratio changes are independent of the Pinus:Betula ratios and are likely to be a result of lake ice-cover changes, allowing longer growing seasons, greater water column stability and higher nutrient concentrations from surrounding catchments. This study highlights the significant differences in aquatic ecosystem and terrestrial vegetation response to climatic changes, with diatom assemblages at these sites either responding before the regional tree-line shift or to a separate ... |
format |
Article in Journal/Newspaper |
author |
Roberts, Sarah Jones, Viv J Allen, Judy RM Huntley, Brian |
spellingShingle |
Roberts, Sarah Jones, Viv J Allen, Judy RM Huntley, Brian Diatom response to mid-Holocene climate in three small Arctic lakes in northernmost Finnmark |
author_facet |
Roberts, Sarah Jones, Viv J Allen, Judy RM Huntley, Brian |
author_sort |
Roberts, Sarah |
title |
Diatom response to mid-Holocene climate in three small Arctic lakes in northernmost Finnmark |
title_short |
Diatom response to mid-Holocene climate in three small Arctic lakes in northernmost Finnmark |
title_full |
Diatom response to mid-Holocene climate in three small Arctic lakes in northernmost Finnmark |
title_fullStr |
Diatom response to mid-Holocene climate in three small Arctic lakes in northernmost Finnmark |
title_full_unstemmed |
Diatom response to mid-Holocene climate in three small Arctic lakes in northernmost Finnmark |
title_sort |
diatom response to mid-holocene climate in three small arctic lakes in northernmost finnmark |
publisher |
SAGE Publications |
publishDate |
2015 |
url |
http://dx.doi.org/10.1177/0959683615572853 https://journals.sagepub.com/doi/pdf/10.1177/0959683615572853 https://journals.sagepub.com/doi/full-xml/10.1177/0959683615572853 |
long_lat |
ENVELOPE(-130.826,-130.826,57.231,57.231) ENVELOPE(28.184,28.184,71.033,71.033) |
geographic |
Arctic Arctic Lake Gunnarsfjorden |
geographic_facet |
Arctic Arctic Lake Gunnarsfjorden |
genre |
Arctic Finnmark Tundra Finnmark |
genre_facet |
Arctic Finnmark Tundra Finnmark |
op_source |
The Holocene volume 25, issue 6, page 911-920 ISSN 0959-6836 1477-0911 |
op_rights |
https://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683615572853 |
container_title |
The Holocene |
container_volume |
25 |
container_issue |
6 |
container_start_page |
911 |
op_container_end_page |
920 |
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1812811371163680768 |