Development of a Subarctic Peatland Linked to Slope Dynamics at Lac Wiyâshâkimî (Nunavik, Canada)

File Identifier: 13110_iso.xml

Metadata Language: eng; CAN

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Resource Type: Dataset

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Individual Name: Polar Data Catalogue

Organisation Name: Canadian Cryospheric Information Network

Role: Point Of Contact

Contact Info:

Voice: (519) 888-4567 x32689

Street Address: 200 University Avenue West, University of Waterloo

City: Waterloo

Province/State: Ontario

Postal Code/ZIP: N2L 3G1

Country: Canada

E-Mail Address: pdc@uwaterloo.ca

Metadata Date: 2019-10-15

Metadata Standard Name: North American Profile of ISO 19115:2003

Metadata Standard Version: 2009-01-01

Abstract: A peat core was removed from the deepest location of the peatland (180-200 cm) using a Russian peat corer. The first 60 cm of the core (uppermost part) consists of water and some present-day Sphagnum represented by Sphagnum flexuosum, C. rostrata (fen taxa), E. russeolum and C. calyculata. The rest of the core (140 cm) is composed of sandy organic matter overlain by decomposed peat. Samples were taken from the core for loss on ignition (LOI), plant macrofossil analysis and 14C dating. LOI was performed at 2-cm intervals to determine the respective percentages of organic material and mineral material. Samples were first dried in a steam room at 100ºC and weighed (initial weight). They were then heated in an oven (Thermolyne 100) to a temperature of 600ºC until the organic matter was completely eliminated (Heiri et al., 2001). The mineral fraction was then weighed again (final weight). Macrofossil analysis was also performed at 2-cm intervals following the protocol outlined by Bhiry and Filion (2001). The analysis was carried out at the Laboratoire de paléoécologie at the Centre d'études nordiques (CEN-Université Laval). Sediments were treated with a weak 5% aqueous potassium hydroxide (KOH) solution and boiled for a few minutes to deflocculate. The material was then wet-screened through a 180mm mesh sieve. In each sample, the frequency of each group of botanical components and sand was estimated as a percentage by volume (10 cm3). The number of tree, shrub and herbaceous macroremains in each sample was counted and converted to counts per 10 cm3. The species of Sphagnum were identified based on a subsample of 100 leaves. Macrofossils were identified under a binocular microscope at 6-20X magnification. References used in identifying plant remains included Rousseau (1974), Montgomery (1977), Porsild and Cody (1980), Marie-Victorin (1995) and Payette (2013, 2015), as well as the collection of CEN. Six organic samples were dated with accelerator mass spectrometry (AMS) at CEN’s laboratory at Université Laval and at the Keck Laboratory, University of California, Irvine (UL-KIU). These samples consisted of needles of Picea or brown moss leaves. The sample from the upper level was composite because the material from one taxon was of insufficient quantity. Dates were calibrated using the Calib 7.1 program (Stuiver et al., 2014). For calculation of the age-depth relationship and peat accumulation rates, we used linear interpolation between calibrated dates.

Purpose: The objective of this study was to detect evidence of gravity processes (e.g. rockfall, debris flows, dry avalanches and snow avalanches and ice-crust sliding) in the peatland and to document the periods of intense geomorphological slope processes that have been recorded in the peatland throughout the Holocene.

Language: eng; CAN

Citation:

Contact Info:

Title: Development of a Subarctic Peatland Linked to Slope Dynamics at Lac Wiyâshâkimî (Nunavik, Canada)

Date:

Date: 2019-10-15

Date Type: Publication Date

Individual Name: Bhiry, Najat

Role: Principal Investigator

Individual Name: Decaulne, Armelle

Role:

Individual Name: Bourgon-Desroches, Myosotis

Role:

Point Of Contact:

Individual Name: Polar Data Catalogue

Organisation Name: Canadian Cryospheric Information Network

Role: Point Of Contact

Contact Info:

Voice: (519) 888-4567 x32689

Street Address: 200 University Avenue West, University of Waterloo

City: Waterloo

Province/State: Ontario

Postal Code/ZIP: N2L 3G1

Country: Canada

E-Mail Address: pdc@uwaterloo.ca

Online Resource: polardata.ca

Topic Category: Environment and Conservation

Keyword Collection:

Keyword: Holocene

Keyword: Loss on ignition (LOI)

Keyword: Nunavik

Keyword: Paleoecology

Keyword: Peat cores

Keyword: Peatland

Keyword: Sediment accumulation rate

Keyword: Slope

Associated Thesaurus: Polar Data Catalogue Thesaurus (Canada)

Keyword: Bear peatland (unofficial name), Northern shore of Lepage Island, Lac Wiyâshâkimî, Nunavik, Québec, Canada - ESIVS

Spatial Extent:

West Bounding Longitude: -74.47513

East Bounding Longitude: -74.47513

North Bounding Latitude: 56.27828

South Bounding Latitude: 56.27828

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Other Constraints: Terms of Use of the Polar Data Catalogue: https://www.polardata.ca/pdcinput/public/termsofuse

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Format Name: Digital file

Format Version: 1.0

Distributor:

Distributor Contact:

Individual Name: Polar Data Catalogue

Organisation Name: Canadian Cryospheric Information Network

Role: Distributor

Contact Info:

Voice: (519) 888-4567 x32689

Street Address: 200 University Avenue West, University of Waterloo

City: Waterloo

Province/State: Ontario

Postal Code/ZIP: N2L 3G1

Country: Canada

E-Mail Address: pdc@uwaterloo.ca