The Holocene 13,4 (2003) pp. 517–526 Holocene lake succession and palaeo-optics of a Subarctic lake
Abstract: Two diatom-based transfer functions for the reconstruction of past levels of dissolved organic carbon (DOC) and water colour were applied to fossil diatom species assemblages from a coastal isolation basin on the eastern shore of Hudson Bay. Diatom stratigraphic changes and the diatom-infe...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.525.3345 2023-05-15T16:35:29+02:00 The Holocene 13,4 (2003) pp. 517–526 Holocene lake succession and palaeo-optics of a Subarctic lake Northern Québec Canada Reinhard Pienitz Warwick F. Vincent The Pennsylvania State University CiteSeerX Archives 2002 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.525.3345 http://www.cen.ulaval.ca/warwickvincent/pdffiles/167.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.525.3345 http://www.cen.ulaval.ca/warwickvincent/pdffiles/167.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.cen.ulaval.ca/warwickvincent/pdffiles/167.pdf Key words Diatoms succession lake sediments dissolved organic carbon DOC water colour palaeo-optics ultraviolet radiation UVR Holocene Subarctic Québec Canada text 2002 ftciteseerx 2016-01-08T10:19:47Z Abstract: Two diatom-based transfer functions for the reconstruction of past levels of dissolved organic carbon (DOC) and water colour were applied to fossil diatom species assemblages from a coastal isolation basin on the eastern shore of Hudson Bay. Diatom stratigraphic changes and the diatom-inferred patterns of limnological change following the retreat of Holocene marine waters of the Tyrrell Sea revealed a highly variable Holocene lake trajectory associated with successional shifts in lake catchment vegetation and soil development. The main trends observed in the Holocene history of Lake Kachishayoot are: (1) a progressive loss of alkalinity over time; and (2) abrupt increases in DOC and water colour that coincide with the arrival of spruce (Picea mariana) in the catchment. Reconstructed DOC allowed the estimation of past depths of ultraviolet (UV) penetration in the water-column of Lake Kachishayoot. Past variations in biological UV exposure were inferred using optical models based on DOC concentrations and the response curves for DNA damage and UV photoinhibition of photosynthesis. The palaeoecological analyses revealed large changes in the underwater photobiological environment over the course of the Holocene period, from extremely high UV exposure after the initial forma-tion of the lake and its isolation from the sea, to an order-of-magnitude lower biological UV exposure under the present conditions of catchment vegetation. Text Hudson Bay Subarctic Unknown Canada Hudson Hudson Bay Tyrrell ENVELOPE(-69.512,-69.512,-69.634,-69.634) |
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op_collection_id |
ftciteseerx |
language |
English |
topic |
Key words Diatoms succession lake sediments dissolved organic carbon DOC water colour palaeo-optics ultraviolet radiation UVR Holocene Subarctic Québec Canada |
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Key words Diatoms succession lake sediments dissolved organic carbon DOC water colour palaeo-optics ultraviolet radiation UVR Holocene Subarctic Québec Canada Northern Québec Canada Reinhard Pienitz Warwick F. Vincent The Holocene 13,4 (2003) pp. 517–526 Holocene lake succession and palaeo-optics of a Subarctic lake |
topic_facet |
Key words Diatoms succession lake sediments dissolved organic carbon DOC water colour palaeo-optics ultraviolet radiation UVR Holocene Subarctic Québec Canada |
description |
Abstract: Two diatom-based transfer functions for the reconstruction of past levels of dissolved organic carbon (DOC) and water colour were applied to fossil diatom species assemblages from a coastal isolation basin on the eastern shore of Hudson Bay. Diatom stratigraphic changes and the diatom-inferred patterns of limnological change following the retreat of Holocene marine waters of the Tyrrell Sea revealed a highly variable Holocene lake trajectory associated with successional shifts in lake catchment vegetation and soil development. The main trends observed in the Holocene history of Lake Kachishayoot are: (1) a progressive loss of alkalinity over time; and (2) abrupt increases in DOC and water colour that coincide with the arrival of spruce (Picea mariana) in the catchment. Reconstructed DOC allowed the estimation of past depths of ultraviolet (UV) penetration in the water-column of Lake Kachishayoot. Past variations in biological UV exposure were inferred using optical models based on DOC concentrations and the response curves for DNA damage and UV photoinhibition of photosynthesis. The palaeoecological analyses revealed large changes in the underwater photobiological environment over the course of the Holocene period, from extremely high UV exposure after the initial forma-tion of the lake and its isolation from the sea, to an order-of-magnitude lower biological UV exposure under the present conditions of catchment vegetation. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Northern Québec Canada Reinhard Pienitz Warwick F. Vincent |
author_facet |
Northern Québec Canada Reinhard Pienitz Warwick F. Vincent |
author_sort |
Northern Québec Canada |
title |
The Holocene 13,4 (2003) pp. 517–526 Holocene lake succession and palaeo-optics of a Subarctic lake |
title_short |
The Holocene 13,4 (2003) pp. 517–526 Holocene lake succession and palaeo-optics of a Subarctic lake |
title_full |
The Holocene 13,4 (2003) pp. 517–526 Holocene lake succession and palaeo-optics of a Subarctic lake |
title_fullStr |
The Holocene 13,4 (2003) pp. 517–526 Holocene lake succession and palaeo-optics of a Subarctic lake |
title_full_unstemmed |
The Holocene 13,4 (2003) pp. 517–526 Holocene lake succession and palaeo-optics of a Subarctic lake |
title_sort |
holocene 13,4 (2003) pp. 517–526 holocene lake succession and palaeo-optics of a subarctic lake |
publishDate |
2002 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.525.3345 http://www.cen.ulaval.ca/warwickvincent/pdffiles/167.pdf |
long_lat |
ENVELOPE(-69.512,-69.512,-69.634,-69.634) |
geographic |
Canada Hudson Hudson Bay Tyrrell |
geographic_facet |
Canada Hudson Hudson Bay Tyrrell |
genre |
Hudson Bay Subarctic |
genre_facet |
Hudson Bay Subarctic |
op_source |
http://www.cen.ulaval.ca/warwickvincent/pdffiles/167.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.525.3345 http://www.cen.ulaval.ca/warwickvincent/pdffiles/167.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766025717130199040 |