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 atmo...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.355.6685 2023-05-15T14:53:37+02:00 Quantifying Recent Ecological Changes in Remote Lakes of North America and Greenland Using Sediment Diatom Assemblages William O. Hobbs Richard J. Telford H. John B. Birks Jasmine E. Saros Roderick R. O Bianca B. Perren Émilie Saulnier-talbot Er P. Wolfe The Pennsylvania State University CiteSeerX Archives application/zip http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.355.6685 en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.355.6685 Metadata may be used without restrictions as long as the oai identifier remains attached to it. ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/e0/16/PLoS_One_2010_Apr_2_5(4)_e10026.tar.gz text ftciteseerx 2016-01-08T00:33:29Z 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 (b-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,250 years (Little Ice Age). For both arctic and alpine lakes, b-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 b-diversity and any single physical or limnological parameter (including lake and catchment area, maximum depth, pH, conductivity, [NO3 2], modeled Nr Text Arctic Climate change Greenland Unknown Arctic Greenland Remote Lake ENVELOPE(-70.700,-70.700,70.996,70.996) |
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English |
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 (b-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,250 years (Little Ice Age). For both arctic and alpine lakes, b-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 b-diversity and any single physical or limnological parameter (including lake and catchment area, maximum depth, pH, conductivity, [NO3 2], modeled Nr |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
William O. Hobbs Richard J. Telford H. John B. Birks Jasmine E. Saros Roderick R. O Bianca B. Perren Émilie Saulnier-talbot Er P. Wolfe |
spellingShingle |
William O. Hobbs Richard J. Telford H. John B. Birks Jasmine E. Saros Roderick R. O Bianca B. Perren Émilie Saulnier-talbot Er P. Wolfe Quantifying Recent Ecological Changes in Remote Lakes of North America and Greenland Using Sediment Diatom Assemblages |
author_facet |
William O. Hobbs Richard J. Telford H. John B. Birks Jasmine E. Saros Roderick R. O Bianca B. Perren Émilie Saulnier-talbot Er P. Wolfe |
author_sort |
William O. Hobbs |
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 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.355.6685 |
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 |
ftp://ftp.ncbi.nlm.nih.gov/pub/pmc/e0/16/PLoS_One_2010_Apr_2_5(4)_e10026.tar.gz |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.355.6685 |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766325224673902592 |