A paleoecological perspective on 1450 years of human impacts from a lake in southern Greenland
A multiproxy sedimentary record from Lake Igaliku in southern Greenland documents 1450 years of human impacts on the landscape. Diatoms, scaled chrysophytes, and C and N geochemistry show perturbations consistent with recent agricultural activities (post-ad 1980), superimposed upon long-term environ...
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crsagepubl:10.1177/0959683612437865 2024-09-15T18:09:01+00:00 A paleoecological perspective on 1450 years of human impacts from a lake in southern Greenland Perren, Bianca B Massa, Charly Bichet, Vincent Gauthier, Émilie Mathieu, Olivier Petit, Christophe Richard, Hervé 2012 http://dx.doi.org/10.1177/0959683612437865 http://journals.sagepub.com/doi/pdf/10.1177/0959683612437865 http://journals.sagepub.com/doi/full-xml/10.1177/0959683612437865 en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 22, issue 9, page 1025-1034 ISSN 0959-6836 1477-0911 journal-article 2012 crsagepubl https://doi.org/10.1177/0959683612437865 2024-08-19T04:28:16Z A multiproxy sedimentary record from Lake Igaliku in southern Greenland documents 1450 years of human impacts on the landscape. Diatoms, scaled chrysophytes, and C and N geochemistry show perturbations consistent with recent agricultural activities (post-ad 1980), superimposed upon long-term environmental variability. While the response to Norse agriculture (~ad 986–1450) is weak, the biological response to the last 30 years of modern sheep farming is marked, with drastic changes in diatom taxa, δ 13 C and δ 15 N isotopic ratios, and a sharp increase in scaled chrysophytes. Indeed, current conditions in the lake during the last 30 years are unprecedented in the context of the last 1450 years. The dominant driver for recent changes is likely an intensification of agricultural practices combined with warming summer temperatures. Warm temperatures and agricultural disturbance together during Norse Landnám did not lead to the marked changes seen in the modern lake environment over the last 30 years. The synergistic response between increased climate warming and agriculture will likely have unanticipated effects. These findings confirm the sensitivity of Arctic lakes to external anthropogenic forcing and are the first analyses of their kind for the effects of agriculture in Greenland. Article in Journal/Newspaper Greenland Igaliku SAGE Publications The Holocene 22 9 1025 1034 |
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language |
English |
description |
A multiproxy sedimentary record from Lake Igaliku in southern Greenland documents 1450 years of human impacts on the landscape. Diatoms, scaled chrysophytes, and C and N geochemistry show perturbations consistent with recent agricultural activities (post-ad 1980), superimposed upon long-term environmental variability. While the response to Norse agriculture (~ad 986–1450) is weak, the biological response to the last 30 years of modern sheep farming is marked, with drastic changes in diatom taxa, δ 13 C and δ 15 N isotopic ratios, and a sharp increase in scaled chrysophytes. Indeed, current conditions in the lake during the last 30 years are unprecedented in the context of the last 1450 years. The dominant driver for recent changes is likely an intensification of agricultural practices combined with warming summer temperatures. Warm temperatures and agricultural disturbance together during Norse Landnám did not lead to the marked changes seen in the modern lake environment over the last 30 years. The synergistic response between increased climate warming and agriculture will likely have unanticipated effects. These findings confirm the sensitivity of Arctic lakes to external anthropogenic forcing and are the first analyses of their kind for the effects of agriculture in Greenland. |
format |
Article in Journal/Newspaper |
author |
Perren, Bianca B Massa, Charly Bichet, Vincent Gauthier, Émilie Mathieu, Olivier Petit, Christophe Richard, Hervé |
spellingShingle |
Perren, Bianca B Massa, Charly Bichet, Vincent Gauthier, Émilie Mathieu, Olivier Petit, Christophe Richard, Hervé A paleoecological perspective on 1450 years of human impacts from a lake in southern Greenland |
author_facet |
Perren, Bianca B Massa, Charly Bichet, Vincent Gauthier, Émilie Mathieu, Olivier Petit, Christophe Richard, Hervé |
author_sort |
Perren, Bianca B |
title |
A paleoecological perspective on 1450 years of human impacts from a lake in southern Greenland |
title_short |
A paleoecological perspective on 1450 years of human impacts from a lake in southern Greenland |
title_full |
A paleoecological perspective on 1450 years of human impacts from a lake in southern Greenland |
title_fullStr |
A paleoecological perspective on 1450 years of human impacts from a lake in southern Greenland |
title_full_unstemmed |
A paleoecological perspective on 1450 years of human impacts from a lake in southern Greenland |
title_sort |
paleoecological perspective on 1450 years of human impacts from a lake in southern greenland |
publisher |
SAGE Publications |
publishDate |
2012 |
url |
http://dx.doi.org/10.1177/0959683612437865 http://journals.sagepub.com/doi/pdf/10.1177/0959683612437865 http://journals.sagepub.com/doi/full-xml/10.1177/0959683612437865 |
genre |
Greenland Igaliku |
genre_facet |
Greenland Igaliku |
op_source |
The Holocene volume 22, issue 9, page 1025-1034 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683612437865 |
container_title |
The Holocene |
container_volume |
22 |
container_issue |
9 |
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1025 |
op_container_end_page |
1034 |
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1810446403884810240 |