Quantifying Recent Ecological Changes in Remote Lakes of North America and Greenland Using Sediment Diatom Assemblages
Background: Although arctic lakes have responded sensitively to 20(th)-century climate change, it remains uncertain how these ecological transformations compare with alpine and montane-boreal counterparts over the same interval. Furthermore, it is unclear to what degree other forcings, including atm...
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ftucl:oai:eprints.ucl.ac.uk.OAI2:166596 2023-12-24T10:13:44+01:00 Quantifying Recent Ecological Changes in Remote Lakes of North America and Greenland Using Sediment Diatom Assemblages Hobbs, WO Telford, RJ Birks, HJB Saros, JE Hazewinkel, RRO Perren, BB Saulnier-Talbot, E Wolfe, AP 2010-04-02 application/pdf https://discovery.ucl.ac.uk/id/eprint/166596/1/166596.pdf https://discovery.ucl.ac.uk/id/eprint/166596/ eng eng PUBLIC LIBRARY SCIENCE https://discovery.ucl.ac.uk/id/eprint/166596/1/166596.pdf https://discovery.ucl.ac.uk/id/eprint/166596/ open PLOS ONE , 5 (3) , Article e10026. (2010) REGIONAL PALEOLIMNOLOGICAL ASSESSMENT ATMOSPHERIC NITROGEN DEPOSITION RECENT ENVIRONMENTAL-CHANGES MOUNTAIN NATIONAL-PARK BRITISH-COLUMBIA ROCKY-MOUNTAINS CLIMATE-CHANGE ALPINE LAKES ARCTIC LAKES EUTROPHICATION Article 2010 ftucl 2023-11-27T13:07:29Z Background: Although arctic lakes have responded sensitively to 20(th)-century climate change, it remains uncertain how these ecological transformations compare with alpine and montane-boreal counterparts over the same interval. Furthermore, it is unclear to what degree other forcings, including atmospheric deposition of anthropogenic reactive nitrogen (Nr), have participated in recent regime shifts. Diatom-based paleolimnological syntheses offer an effective tool for retrospective assessments of past and ongoing changes in remote lake ecosystems.Methodology/Principal Findings: We synthesized 52 dated sediment diatom records from lakes in western North America and west Greenland, spanning broad latitudinal and altitudinal gradients, and representing alpine (n = 15), arctic (n = 20), and forested boreal-montane (n = 17) ecosystems. Diatom compositional turnover (beta-diversity) during the 20(th) century was estimated using Detrended Canonical Correspondence Analysis (DCCA) for each site and compared, for cores with sufficiently robust chronologies, to both the 19(th) century and the prior similar to 250 years (Little Ice Age). For both arctic and alpine lakes, beta-diversity during the 20(th) century is significantly greater than the previous 350 years, and increases with both latitude and altitude. Because no correlation is apparent between 20(th)-century diatom beta-diversity and any single physical or limnological parameter (including lake and catchment area, maximum depth, pH, conductivity, [NO3-], modeled Nr deposition, ambient summer and winter air temperatures, and modeled temperature trends 1948-2008), we used Principal Components Analysis (PCA) to summarize the amplitude of recent changes in relationship to lake pH, lake: catchment area ratio, modeled Nr deposition, and recent temperature trends.Conclusions/Significance: The ecological responses of remote lakes to post-industrial environmental changes are complex. However, two regions reveal concentrations of sites with elevated 20(th)-century diatom ... Article in Journal/Newspaper Arctic Climate change Greenland University College London: UCL Discovery Arctic Greenland Remote Lake ENVELOPE(-70.700,-70.700,70.996,70.996) |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
English |
topic |
REGIONAL PALEOLIMNOLOGICAL ASSESSMENT ATMOSPHERIC NITROGEN DEPOSITION RECENT ENVIRONMENTAL-CHANGES MOUNTAIN NATIONAL-PARK BRITISH-COLUMBIA ROCKY-MOUNTAINS CLIMATE-CHANGE ALPINE LAKES ARCTIC LAKES EUTROPHICATION |
spellingShingle |
REGIONAL PALEOLIMNOLOGICAL ASSESSMENT ATMOSPHERIC NITROGEN DEPOSITION RECENT ENVIRONMENTAL-CHANGES MOUNTAIN NATIONAL-PARK BRITISH-COLUMBIA ROCKY-MOUNTAINS CLIMATE-CHANGE ALPINE LAKES ARCTIC LAKES EUTROPHICATION Hobbs, WO Telford, RJ Birks, HJB Saros, JE Hazewinkel, RRO Perren, BB Saulnier-Talbot, E Wolfe, AP Quantifying Recent Ecological Changes in Remote Lakes of North America and Greenland Using Sediment Diatom Assemblages |
topic_facet |
REGIONAL PALEOLIMNOLOGICAL ASSESSMENT ATMOSPHERIC NITROGEN DEPOSITION RECENT ENVIRONMENTAL-CHANGES MOUNTAIN NATIONAL-PARK BRITISH-COLUMBIA ROCKY-MOUNTAINS CLIMATE-CHANGE ALPINE LAKES ARCTIC LAKES EUTROPHICATION |
description |
Background: Although arctic lakes have responded sensitively to 20(th)-century climate change, it remains uncertain how these ecological transformations compare with alpine and montane-boreal counterparts over the same interval. Furthermore, it is unclear to what degree other forcings, including atmospheric deposition of anthropogenic reactive nitrogen (Nr), have participated in recent regime shifts. Diatom-based paleolimnological syntheses offer an effective tool for retrospective assessments of past and ongoing changes in remote lake ecosystems.Methodology/Principal Findings: We synthesized 52 dated sediment diatom records from lakes in western North America and west Greenland, spanning broad latitudinal and altitudinal gradients, and representing alpine (n = 15), arctic (n = 20), and forested boreal-montane (n = 17) ecosystems. Diatom compositional turnover (beta-diversity) during the 20(th) century was estimated using Detrended Canonical Correspondence Analysis (DCCA) for each site and compared, for cores with sufficiently robust chronologies, to both the 19(th) century and the prior similar to 250 years (Little Ice Age). For both arctic and alpine lakes, beta-diversity during the 20(th) century is significantly greater than the previous 350 years, and increases with both latitude and altitude. Because no correlation is apparent between 20(th)-century diatom beta-diversity and any single physical or limnological parameter (including lake and catchment area, maximum depth, pH, conductivity, [NO3-], modeled Nr deposition, ambient summer and winter air temperatures, and modeled temperature trends 1948-2008), we used Principal Components Analysis (PCA) to summarize the amplitude of recent changes in relationship to lake pH, lake: catchment area ratio, modeled Nr deposition, and recent temperature trends.Conclusions/Significance: The ecological responses of remote lakes to post-industrial environmental changes are complex. However, two regions reveal concentrations of sites with elevated 20(th)-century diatom ... |
format |
Article in Journal/Newspaper |
author |
Hobbs, WO Telford, RJ Birks, HJB Saros, JE Hazewinkel, RRO Perren, BB Saulnier-Talbot, E Wolfe, AP |
author_facet |
Hobbs, WO Telford, RJ Birks, HJB Saros, JE Hazewinkel, RRO Perren, BB Saulnier-Talbot, E Wolfe, AP |
author_sort |
Hobbs, WO |
title |
Quantifying Recent Ecological Changes in Remote Lakes of North America and Greenland Using Sediment Diatom Assemblages |
title_short |
Quantifying Recent Ecological Changes in Remote Lakes of North America and Greenland Using Sediment Diatom Assemblages |
title_full |
Quantifying Recent Ecological Changes in Remote Lakes of North America and Greenland Using Sediment Diatom Assemblages |
title_fullStr |
Quantifying Recent Ecological Changes in Remote Lakes of North America and Greenland Using Sediment Diatom Assemblages |
title_full_unstemmed |
Quantifying Recent Ecological Changes in Remote Lakes of North America and Greenland Using Sediment Diatom Assemblages |
title_sort |
quantifying recent ecological changes in remote lakes of north america and greenland using sediment diatom assemblages |
publisher |
PUBLIC LIBRARY SCIENCE |
publishDate |
2010 |
url |
https://discovery.ucl.ac.uk/id/eprint/166596/1/166596.pdf https://discovery.ucl.ac.uk/id/eprint/166596/ |
long_lat |
ENVELOPE(-70.700,-70.700,70.996,70.996) |
geographic |
Arctic Greenland Remote Lake |
geographic_facet |
Arctic Greenland Remote Lake |
genre |
Arctic Climate change Greenland |
genre_facet |
Arctic Climate change Greenland |
op_source |
PLOS ONE , 5 (3) , Article e10026. (2010) |
op_relation |
https://discovery.ucl.ac.uk/id/eprint/166596/1/166596.pdf https://discovery.ucl.ac.uk/id/eprint/166596/ |
op_rights |
open |
_version_ |
1786185295643803648 |