Holocene Dynamics of an Inland Palsa Peatland at Wiyâshâkimî Lake (Nunavik, Canada)
This study examines the Holocene evolution of an inland subarctic permafrost peatland located on the north bank of Wiyâshâkimî Lake (Nunavik, northeastern Canada). The analysis of plant macrofossils allowed us to reconstruct the succession of the trophic conditions of a palsa and a filled thermokars...
Published in: | Écoscience |
---|---|
Main Authors: | , , |
Format: | Text |
Language: | English |
Published: |
Centre d'études nordiques, Université Laval
2021
|
Subjects: | |
Online Access: | https://doi.org/10.1080/11956860.2021.1907975 |
id |
ftbioone:10.1080/11956860.2021.1907975 |
---|---|
record_format |
openpolar |
spelling |
ftbioone:10.1080/11956860.2021.1907975 2024-06-02T08:08:01+00:00 Holocene Dynamics of an Inland Palsa Peatland at Wiyâshâkimî Lake (Nunavik, Canada) Karine Langlais Najat Bhiry Martin Lavoie Karine Langlais Najat Bhiry Martin Lavoie world 2021-12-28 text/HTML https://doi.org/10.1080/11956860.2021.1907975 en eng Centre d'études nordiques, Université Laval doi:10.1080/11956860.2021.1907975 All rights reserved. https://doi.org/10.1080/11956860.2021.1907975 Paléoecologie permafrost peatlands tourbières à pergélisol Text 2021 ftbioone https://doi.org/10.1080/11956860.2021.1907975 2024-05-07T00:51:19Z This study examines the Holocene evolution of an inland subarctic permafrost peatland located on the north bank of Wiyâshâkimî Lake (Nunavik, northeastern Canada). The analysis of plant macrofossils allowed us to reconstruct the succession of the trophic conditions of a palsa and a filled thermokarst pond. The accumulation of organic matter began at around 6290 cal. y BP. The evolution of the site then followed three stages: a pond (6290–5790 cal. y BP), a minerotrophic peatland (5790–4350 cal. y BP) and an ombrotrophic peatland (from 4350 cal. y BP). The establishment of permafrost caused a palsa to form at around 170 cal. y BP, which corresponds to the coldest period of the Little Ice Age in northeastern Canada. A subsequent degradation of the palsa and the formation of a thermokarst pond were induced by the climate warming that began at the turn of the 20th century. The analysis of plant macrofossils from an adjacent filled thermokarst pond indicated three phases of development over a short 450-year period: subaquatic, minerotrophic, and ombrotrophic phases. When combined with previous studies of filled thermokarst ponds in northern Québec, this result indicates that ponds are rapidly filling in with vegetation and acting as carbon sinks. Text Ice palsa permafrost Subarctic Thermokarst Nunavik pergélisol BioOne Online Journals Canada Nunavik Écoscience 28 3-4 269 282 |
institution |
Open Polar |
collection |
BioOne Online Journals |
op_collection_id |
ftbioone |
language |
English |
topic |
Paléoecologie permafrost peatlands tourbières à pergélisol |
spellingShingle |
Paléoecologie permafrost peatlands tourbières à pergélisol Karine Langlais Najat Bhiry Martin Lavoie Holocene Dynamics of an Inland Palsa Peatland at Wiyâshâkimî Lake (Nunavik, Canada) |
topic_facet |
Paléoecologie permafrost peatlands tourbières à pergélisol |
description |
This study examines the Holocene evolution of an inland subarctic permafrost peatland located on the north bank of Wiyâshâkimî Lake (Nunavik, northeastern Canada). The analysis of plant macrofossils allowed us to reconstruct the succession of the trophic conditions of a palsa and a filled thermokarst pond. The accumulation of organic matter began at around 6290 cal. y BP. The evolution of the site then followed three stages: a pond (6290–5790 cal. y BP), a minerotrophic peatland (5790–4350 cal. y BP) and an ombrotrophic peatland (from 4350 cal. y BP). The establishment of permafrost caused a palsa to form at around 170 cal. y BP, which corresponds to the coldest period of the Little Ice Age in northeastern Canada. A subsequent degradation of the palsa and the formation of a thermokarst pond were induced by the climate warming that began at the turn of the 20th century. The analysis of plant macrofossils from an adjacent filled thermokarst pond indicated three phases of development over a short 450-year period: subaquatic, minerotrophic, and ombrotrophic phases. When combined with previous studies of filled thermokarst ponds in northern Québec, this result indicates that ponds are rapidly filling in with vegetation and acting as carbon sinks. |
author2 |
Karine Langlais Najat Bhiry Martin Lavoie |
format |
Text |
author |
Karine Langlais Najat Bhiry Martin Lavoie |
author_facet |
Karine Langlais Najat Bhiry Martin Lavoie |
author_sort |
Karine Langlais |
title |
Holocene Dynamics of an Inland Palsa Peatland at Wiyâshâkimî Lake (Nunavik, Canada) |
title_short |
Holocene Dynamics of an Inland Palsa Peatland at Wiyâshâkimî Lake (Nunavik, Canada) |
title_full |
Holocene Dynamics of an Inland Palsa Peatland at Wiyâshâkimî Lake (Nunavik, Canada) |
title_fullStr |
Holocene Dynamics of an Inland Palsa Peatland at Wiyâshâkimî Lake (Nunavik, Canada) |
title_full_unstemmed |
Holocene Dynamics of an Inland Palsa Peatland at Wiyâshâkimî Lake (Nunavik, Canada) |
title_sort |
holocene dynamics of an inland palsa peatland at wiyâshâkimî lake (nunavik, canada) |
publisher |
Centre d'études nordiques, Université Laval |
publishDate |
2021 |
url |
https://doi.org/10.1080/11956860.2021.1907975 |
op_coverage |
world |
geographic |
Canada Nunavik |
geographic_facet |
Canada Nunavik |
genre |
Ice palsa permafrost Subarctic Thermokarst Nunavik pergélisol |
genre_facet |
Ice palsa permafrost Subarctic Thermokarst Nunavik pergélisol |
op_source |
https://doi.org/10.1080/11956860.2021.1907975 |
op_relation |
doi:10.1080/11956860.2021.1907975 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1080/11956860.2021.1907975 |
container_title |
Écoscience |
container_volume |
28 |
container_issue |
3-4 |
container_start_page |
269 |
op_container_end_page |
282 |
_version_ |
1800753178055016448 |