Evolution of agropastoralism around Lake Igaliku (Southern Greenland) during the last two millenia through molecular biomarkers.
International audience Artic is the most sensitive region to the effects of global warming. Indeed, it warms three times faster than the rest of the world. Nowadays, it is an important issue to characterize the responses of these ecosystems to a rise in temperature and the part that Human plays in t...
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HAL CCSD
2014
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Online Access: | https://hal-insu.archives-ouvertes.fr/insu-01061357 |
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ftunivnantes:oai:HAL:insu-01061357v1 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes |
spellingShingle |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes Guillemot, Typhaine Jacob, Jérémy Zocatelli, Renata Gauthier, Emilie Massa, Charly Bichet, Vincent Le Milbeau, Claude Evolution of agropastoralism around Lake Igaliku (Southern Greenland) during the last two millenia through molecular biomarkers. |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes |
description |
International audience Artic is the most sensitive region to the effects of global warming. Indeed, it warms three times faster than the rest of the world. Nowadays, it is an important issue to characterize the responses of these ecosystems to a rise in temperature and the part that Human plays in this mechanism. For several millennia, agriculture and husbandry are known as one of the major anthropogenic impacts on environment. During the last two millennia, global climate warming events allowed two phases of agricultural expansion in South Greenland. The first phase coincided with the medieval Norse colonization between 986 AD and the mid-fifteenth century; the second, corresponds to the modern reestablishment of farmers since 1920, at the very end of the Little Ice Age. This context appears as an exceptional study model to examine the transition from a pristine to an anthropogenic landscape. To this respect, lake deposits provide a sensitive recorder of environmental changes due to land use. In order to assess the history and impacts of grazing activities on the environment, a first molecular inventory was conducted on a sedimentary sequence retrieved from Lake Igaliku (61°00'N, 45°26'W, 15m asl). The analysis of molecular biomarkers retrieved from a well-dated core spanning the last two millennia was confronted to pollen, non pollen palynomorph and elements, allowing us discussing the evolution of agropastoralism and its impacts on the local ecosystems. When found in soils or sediments, fecal sterols and bile acids can help identifying the former presence of Humans and their livestock. In our case, only deoxycholic acid (DCA) is detected with high fluxes recorded during the two phases of agricultural expansion, coincident with high percentages of coprophilous spores. DCA is produced by all herbivores but, because it is the unique bile acid found in Igaliku sediments, we propose that it mainly derives from sheep. Thus, it could be possible to distinguish predominant livestock species raised in the catchment ... |
author2 |
Laboratoire Chrono-environnement (UMR 6249) (LCE) Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC) Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Conference Object |
author |
Guillemot, Typhaine Jacob, Jérémy Zocatelli, Renata Gauthier, Emilie Massa, Charly Bichet, Vincent Le Milbeau, Claude |
author_facet |
Guillemot, Typhaine Jacob, Jérémy Zocatelli, Renata Gauthier, Emilie Massa, Charly Bichet, Vincent Le Milbeau, Claude |
author_sort |
Guillemot, Typhaine |
title |
Evolution of agropastoralism around Lake Igaliku (Southern Greenland) during the last two millenia through molecular biomarkers. |
title_short |
Evolution of agropastoralism around Lake Igaliku (Southern Greenland) during the last two millenia through molecular biomarkers. |
title_full |
Evolution of agropastoralism around Lake Igaliku (Southern Greenland) during the last two millenia through molecular biomarkers. |
title_fullStr |
Evolution of agropastoralism around Lake Igaliku (Southern Greenland) during the last two millenia through molecular biomarkers. |
title_full_unstemmed |
Evolution of agropastoralism around Lake Igaliku (Southern Greenland) during the last two millenia through molecular biomarkers. |
title_sort |
evolution of agropastoralism around lake igaliku (southern greenland) during the last two millenia through molecular biomarkers. |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal-insu.archives-ouvertes.fr/insu-01061357 |
op_coverage |
Padoue, Italy |
long_lat |
ENVELOPE(-45.421,-45.421,60.988,60.988) |
geographic |
Greenland Igaliku |
geographic_facet |
Greenland Igaliku |
genre |
Greenland Igaliku |
genre_facet |
Greenland Igaliku |
op_source |
9ème Conférence de Paléobotanique et Palynologie Européenne https://hal-insu.archives-ouvertes.fr/insu-01061357 9ème Conférence de Paléobotanique et Palynologie Européenne, Aug 2014, Padoue, Italy |
op_relation |
insu-01061357 https://hal-insu.archives-ouvertes.fr/insu-01061357 |
_version_ |
1766018637665140736 |
spelling |
ftunivnantes:oai:HAL:insu-01061357v1 2023-05-15T16:28:57+02:00 Evolution of agropastoralism around Lake Igaliku (Southern Greenland) during the last two millenia through molecular biomarkers. Guillemot, Typhaine Jacob, Jérémy Zocatelli, Renata Gauthier, Emilie Massa, Charly Bichet, Vincent Le Milbeau, Claude Laboratoire Chrono-environnement (UMR 6249) (LCE) Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) Université Bourgogne Franche-Comté COMUE (UBFC)-Université Bourgogne Franche-Comté COMUE (UBFC) Institut des Sciences de la Terre d'Orléans - UMR7327 (ISTO) Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS) Padoue, Italy 2014-08-26 https://hal-insu.archives-ouvertes.fr/insu-01061357 en eng HAL CCSD insu-01061357 https://hal-insu.archives-ouvertes.fr/insu-01061357 9ème Conférence de Paléobotanique et Palynologie Européenne https://hal-insu.archives-ouvertes.fr/insu-01061357 9ème Conférence de Paléobotanique et Palynologie Européenne, Aug 2014, Padoue, Italy [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDE.MCG]Environmental Sciences/Global Changes info:eu-repo/semantics/conferenceObject Conference papers 2014 ftunivnantes 2023-02-08T11:02:40Z International audience Artic is the most sensitive region to the effects of global warming. Indeed, it warms three times faster than the rest of the world. Nowadays, it is an important issue to characterize the responses of these ecosystems to a rise in temperature and the part that Human plays in this mechanism. For several millennia, agriculture and husbandry are known as one of the major anthropogenic impacts on environment. During the last two millennia, global climate warming events allowed two phases of agricultural expansion in South Greenland. The first phase coincided with the medieval Norse colonization between 986 AD and the mid-fifteenth century; the second, corresponds to the modern reestablishment of farmers since 1920, at the very end of the Little Ice Age. This context appears as an exceptional study model to examine the transition from a pristine to an anthropogenic landscape. To this respect, lake deposits provide a sensitive recorder of environmental changes due to land use. In order to assess the history and impacts of grazing activities on the environment, a first molecular inventory was conducted on a sedimentary sequence retrieved from Lake Igaliku (61°00'N, 45°26'W, 15m asl). The analysis of molecular biomarkers retrieved from a well-dated core spanning the last two millennia was confronted to pollen, non pollen palynomorph and elements, allowing us discussing the evolution of agropastoralism and its impacts on the local ecosystems. When found in soils or sediments, fecal sterols and bile acids can help identifying the former presence of Humans and their livestock. In our case, only deoxycholic acid (DCA) is detected with high fluxes recorded during the two phases of agricultural expansion, coincident with high percentages of coprophilous spores. DCA is produced by all herbivores but, because it is the unique bile acid found in Igaliku sediments, we propose that it mainly derives from sheep. Thus, it could be possible to distinguish predominant livestock species raised in the catchment ... Conference Object Greenland Igaliku Université de Nantes: HAL-UNIV-NANTES Greenland Igaliku ENVELOPE(-45.421,-45.421,60.988,60.988) |