Paleoecological and Carbon Accumulation Dynamics of a Fen Peatland in the Hudson Bay Lowlands, Northern Ontario, from the Mid-Holocene to Present
Pollen assemblages, peat humification and carbon:nitrogen stratigraphy were examined at high resolution in a core from a fen peatland in the Hudson Bay Lowlands, Northern Ontario, to interpret the factors that drive long-term peatland dynamics. Subtle changes in the vegetation community are evident...
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ftunivtoronto:oai:localhost:1807/31374 2023-05-15T15:04:35+02:00 Paleoecological and Carbon Accumulation Dynamics of a Fen Peatland in the Hudson Bay Lowlands, Northern Ontario, from the Mid-Holocene to Present O'Reilly, Benjamin Cody Finkelstein, Sarah A. Geography NO_RESTRICTION http://hdl.handle.net/1807/31374 en_ca eng http://hdl.handle.net/1807/31374 Northern Peatland Paleoecology Peatland Carbon Accumulation 0426 Thesis ftunivtoronto 2020-06-17T11:21:15Z Pollen assemblages, peat humification and carbon:nitrogen stratigraphy were examined at high resolution in a core from a fen peatland in the Hudson Bay Lowlands, Northern Ontario, to interpret the factors that drive long-term peatland dynamics. Subtle changes in the vegetation community are evident over the record, suggesting both allogenic and autogenic influences, but a fen community appears to have been resilient to external perturbations including isostatic rebound and hydroclimatic changes between 6400 and 100 years BP. Paleoclimatic reconstructions from the fossil pollen assemblages indicate that precipitation increased 3000 years BP at the end of the Holocene Thermal Maximum, and that carbon accumulation in the fen was controlled more by effective surface moisture (precipitation) than by temperature. The pollen record suggests changes over the past century, including increases in shrub Betula, Alnus, Ambrosia, and Cyperaceae and a decrease in Sphagnum spores, consistent with the observed Pan-Arctic shrub increase. MAST Thesis Arctic Hudson Bay University of Toronto: Research Repository T-Space Arctic Hudson Bay Hudson |
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Open Polar |
collection |
University of Toronto: Research Repository T-Space |
op_collection_id |
ftunivtoronto |
language |
English |
topic |
Northern Peatland Paleoecology Peatland Carbon Accumulation 0426 |
spellingShingle |
Northern Peatland Paleoecology Peatland Carbon Accumulation 0426 O'Reilly, Benjamin Cody Paleoecological and Carbon Accumulation Dynamics of a Fen Peatland in the Hudson Bay Lowlands, Northern Ontario, from the Mid-Holocene to Present |
topic_facet |
Northern Peatland Paleoecology Peatland Carbon Accumulation 0426 |
description |
Pollen assemblages, peat humification and carbon:nitrogen stratigraphy were examined at high resolution in a core from a fen peatland in the Hudson Bay Lowlands, Northern Ontario, to interpret the factors that drive long-term peatland dynamics. Subtle changes in the vegetation community are evident over the record, suggesting both allogenic and autogenic influences, but a fen community appears to have been resilient to external perturbations including isostatic rebound and hydroclimatic changes between 6400 and 100 years BP. Paleoclimatic reconstructions from the fossil pollen assemblages indicate that precipitation increased 3000 years BP at the end of the Holocene Thermal Maximum, and that carbon accumulation in the fen was controlled more by effective surface moisture (precipitation) than by temperature. The pollen record suggests changes over the past century, including increases in shrub Betula, Alnus, Ambrosia, and Cyperaceae and a decrease in Sphagnum spores, consistent with the observed Pan-Arctic shrub increase. MAST |
author2 |
Finkelstein, Sarah A. Geography |
format |
Thesis |
author |
O'Reilly, Benjamin Cody |
author_facet |
O'Reilly, Benjamin Cody |
author_sort |
O'Reilly, Benjamin Cody |
title |
Paleoecological and Carbon Accumulation Dynamics of a Fen Peatland in the Hudson Bay Lowlands, Northern Ontario, from the Mid-Holocene to Present |
title_short |
Paleoecological and Carbon Accumulation Dynamics of a Fen Peatland in the Hudson Bay Lowlands, Northern Ontario, from the Mid-Holocene to Present |
title_full |
Paleoecological and Carbon Accumulation Dynamics of a Fen Peatland in the Hudson Bay Lowlands, Northern Ontario, from the Mid-Holocene to Present |
title_fullStr |
Paleoecological and Carbon Accumulation Dynamics of a Fen Peatland in the Hudson Bay Lowlands, Northern Ontario, from the Mid-Holocene to Present |
title_full_unstemmed |
Paleoecological and Carbon Accumulation Dynamics of a Fen Peatland in the Hudson Bay Lowlands, Northern Ontario, from the Mid-Holocene to Present |
title_sort |
paleoecological and carbon accumulation dynamics of a fen peatland in the hudson bay lowlands, northern ontario, from the mid-holocene to present |
publishDate |
|
url |
http://hdl.handle.net/1807/31374 |
geographic |
Arctic Hudson Bay Hudson |
geographic_facet |
Arctic Hudson Bay Hudson |
genre |
Arctic Hudson Bay |
genre_facet |
Arctic Hudson Bay |
op_relation |
http://hdl.handle.net/1807/31374 |
_version_ |
1766336334633369600 |