Holocene palaeoecological reconstruction of three boreal peatlands in the La Grande Rivière region, Québec, Canada
Pollen and macrofossil analyses from central peat cores along with 23 radiocarbon dates were used in palaeoecological reconstructions for three peatlands (LG1, LG2 and LG3) within the lower La Grande Rivière watershed in northern boreal Québec. Basal ages from LG3 and LG2 indicate up to an 1100 year...
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Online Access: | http://dx.doi.org/10.1177/0959683608101395 http://journals.sagepub.com/doi/pdf/10.1177/0959683608101395 |
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crsagepubl:10.1177/0959683608101395 2023-05-15T17:05:53+02:00 Holocene palaeoecological reconstruction of three boreal peatlands in the La Grande Rivière region, Québec, Canada Beaulieu-Audy, Véronique Garneau, Michelle Richard, Pierre J.H. Asnong, Hans 2009 http://dx.doi.org/10.1177/0959683608101395 http://journals.sagepub.com/doi/pdf/10.1177/0959683608101395 en eng SAGE Publications http://journals.sagepub.com/page/policies/text-and-data-mining-license The Holocene volume 19, issue 3, page 459-476 ISSN 0959-6836 1477-0911 Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change journal-article 2009 crsagepubl https://doi.org/10.1177/0959683608101395 2022-09-21T19:47:45Z Pollen and macrofossil analyses from central peat cores along with 23 radiocarbon dates were used in palaeoecological reconstructions for three peatlands (LG1, LG2 and LG3) within the lower La Grande Rivière watershed in northern boreal Québec. Basal ages from LG3 and LG2 indicate up to an 1100 years later and possibly more abrupt Tyrrell Sea retreat in the LG3 area compared with the timeline for the region. Both autogenic and allogenic factors were found to have influenced local vegetation succession and rates of peat accumulation. Internal autogenic factors such as peat accumulation were key elements for the general peatland developmental pathway that followed the classic hydrosere sequence (pond-fen-bog). Regional climate and hydrography are the main external factors associated with changes in vegetation assemblages, surface wetness and consequently rates of peat accumulation. The LG2 and LG3 peatlands began developing shortly after 7000 cal. BP as shallow ponds with herbaceous freshwater aquatic and emergent taxa. Both sites rapidly evolved into fens with brown mosses. The autogenic transition from fen to bog occurred at both sites between 6000 and 5500 cal. BP. A long-term decrease in peat accumulation rates corresponding to a gradual densification of the local tree and shrub cover occurred at the LG2 and LG3 sites between 5000 and 1500 cal. BP. These changes were simultaneous at the two sites and therefore suggest the influence of external factors such as a shift to cooler and drier climatic conditions from the middle to late Holocene (Neoglacial period). Development of the LG1 site was delayed by a much later Tyrrell Sea retreat and started with a relatively long eutrophic aquatic phase. Both internal factors (minerotrophic conditions) and external factors (local topography and climate) contributed to the somewhat slower pace of vegetation succession. Synchronous increased peat accumulation rates in the last 1500 years at the three sites are attributable to regional vegetational shifts possibly due to the ... Article in Journal/Newspaper La Grande Rivière SAGE Publications (via Crossref) Canada La Grande Rivière ENVELOPE(-79.000,-79.000,53.834,53.834) Tyrrell ENVELOPE(-69.512,-69.512,-69.634,-69.634) The Holocene 19 3 459 476 |
institution |
Open Polar |
collection |
SAGE Publications (via Crossref) |
op_collection_id |
crsagepubl |
language |
English |
topic |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
spellingShingle |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change Beaulieu-Audy, Véronique Garneau, Michelle Richard, Pierre J.H. Asnong, Hans Holocene palaeoecological reconstruction of three boreal peatlands in the La Grande Rivière region, Québec, Canada |
topic_facet |
Paleontology Earth-Surface Processes Ecology Archeology Global and Planetary Change |
description |
Pollen and macrofossil analyses from central peat cores along with 23 radiocarbon dates were used in palaeoecological reconstructions for three peatlands (LG1, LG2 and LG3) within the lower La Grande Rivière watershed in northern boreal Québec. Basal ages from LG3 and LG2 indicate up to an 1100 years later and possibly more abrupt Tyrrell Sea retreat in the LG3 area compared with the timeline for the region. Both autogenic and allogenic factors were found to have influenced local vegetation succession and rates of peat accumulation. Internal autogenic factors such as peat accumulation were key elements for the general peatland developmental pathway that followed the classic hydrosere sequence (pond-fen-bog). Regional climate and hydrography are the main external factors associated with changes in vegetation assemblages, surface wetness and consequently rates of peat accumulation. The LG2 and LG3 peatlands began developing shortly after 7000 cal. BP as shallow ponds with herbaceous freshwater aquatic and emergent taxa. Both sites rapidly evolved into fens with brown mosses. The autogenic transition from fen to bog occurred at both sites between 6000 and 5500 cal. BP. A long-term decrease in peat accumulation rates corresponding to a gradual densification of the local tree and shrub cover occurred at the LG2 and LG3 sites between 5000 and 1500 cal. BP. These changes were simultaneous at the two sites and therefore suggest the influence of external factors such as a shift to cooler and drier climatic conditions from the middle to late Holocene (Neoglacial period). Development of the LG1 site was delayed by a much later Tyrrell Sea retreat and started with a relatively long eutrophic aquatic phase. Both internal factors (minerotrophic conditions) and external factors (local topography and climate) contributed to the somewhat slower pace of vegetation succession. Synchronous increased peat accumulation rates in the last 1500 years at the three sites are attributable to regional vegetational shifts possibly due to the ... |
format |
Article in Journal/Newspaper |
author |
Beaulieu-Audy, Véronique Garneau, Michelle Richard, Pierre J.H. Asnong, Hans |
author_facet |
Beaulieu-Audy, Véronique Garneau, Michelle Richard, Pierre J.H. Asnong, Hans |
author_sort |
Beaulieu-Audy, Véronique |
title |
Holocene palaeoecological reconstruction of three boreal peatlands in the La Grande Rivière region, Québec, Canada |
title_short |
Holocene palaeoecological reconstruction of three boreal peatlands in the La Grande Rivière region, Québec, Canada |
title_full |
Holocene palaeoecological reconstruction of three boreal peatlands in the La Grande Rivière region, Québec, Canada |
title_fullStr |
Holocene palaeoecological reconstruction of three boreal peatlands in the La Grande Rivière region, Québec, Canada |
title_full_unstemmed |
Holocene palaeoecological reconstruction of three boreal peatlands in the La Grande Rivière region, Québec, Canada |
title_sort |
holocene palaeoecological reconstruction of three boreal peatlands in the la grande rivière region, québec, canada |
publisher |
SAGE Publications |
publishDate |
2009 |
url |
http://dx.doi.org/10.1177/0959683608101395 http://journals.sagepub.com/doi/pdf/10.1177/0959683608101395 |
long_lat |
ENVELOPE(-79.000,-79.000,53.834,53.834) ENVELOPE(-69.512,-69.512,-69.634,-69.634) |
geographic |
Canada La Grande Rivière Tyrrell |
geographic_facet |
Canada La Grande Rivière Tyrrell |
genre |
La Grande Rivière |
genre_facet |
La Grande Rivière |
op_source |
The Holocene volume 19, issue 3, page 459-476 ISSN 0959-6836 1477-0911 |
op_rights |
http://journals.sagepub.com/page/policies/text-and-data-mining-license |
op_doi |
https://doi.org/10.1177/0959683608101395 |
container_title |
The Holocene |
container_volume |
19 |
container_issue |
3 |
container_start_page |
459 |
op_container_end_page |
476 |
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1766060729721421824 |