ORIGINAL PAPER Optical gradients and phytoplankton production in the Mackenzie River and the coastal
Abstract We sampled a 300-km transect along the Mackenzie River and its associated coastal shelf system (western Canadian Arctic) in July–August of 2004 to evaluate the gradients in optical, phytoplankton and photosynthetic characteristics. The attenuation of photo-synthetically available radiation...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.474.5112 2023-05-15T15:04:42+02:00 ORIGINAL PAPER Optical gradients and phytoplankton production in the Mackenzie River and the coastal Beaufort Sea Leira Retamal Æ Sylvia Bonilla Æ Warwick F. Vincent The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.474.5112 http://132.203.57.253/warwickvincent/PDFfiles/220.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.474.5112 http://132.203.57.253/warwickvincent/PDFfiles/220.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://132.203.57.253/warwickvincent/PDFfiles/220.pdf text ftciteseerx 2016-01-08T07:29:51Z Abstract We sampled a 300-km transect along the Mackenzie River and its associated coastal shelf system (western Canadian Arctic) in July–August of 2004 to evaluate the gradients in optical, phytoplankton and photosynthetic characteristics. The attenuation of photo-synthetically available radiation (PAR) was best explained by coloured dissolved organic matter (CDOM) and tur-bidity (non-algal particles), while UV attenuation correlated most strongly with CDOM. Bacillariophyceae and Chlorophyceae dominated in the river, and shifted to Cryptophyceae and Prasinophyceae in the estuarine tran-sition zone. In the coastal shelf waters, picoplanktonic cells dominated the surface autotrophic communities while both large and small cells occurred in the deep chlorophyll maximum. High PAR attenuation reduced the integral primary production rate in the river, while at an offshore marine site, 55 % of integral production was at or below the pycnocline, under low PAR. Climate change is likely to increase the sediment and CDOM loading to these waters, which would exacerbate light limitation of photosynthesis throughout the system. Text Arctic Climate change Mackenzie river Phytoplankton Unknown Arctic Mackenzie River |
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Open Polar |
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Unknown |
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ftciteseerx |
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English |
description |
Abstract We sampled a 300-km transect along the Mackenzie River and its associated coastal shelf system (western Canadian Arctic) in July–August of 2004 to evaluate the gradients in optical, phytoplankton and photosynthetic characteristics. The attenuation of photo-synthetically available radiation (PAR) was best explained by coloured dissolved organic matter (CDOM) and tur-bidity (non-algal particles), while UV attenuation correlated most strongly with CDOM. Bacillariophyceae and Chlorophyceae dominated in the river, and shifted to Cryptophyceae and Prasinophyceae in the estuarine tran-sition zone. In the coastal shelf waters, picoplanktonic cells dominated the surface autotrophic communities while both large and small cells occurred in the deep chlorophyll maximum. High PAR attenuation reduced the integral primary production rate in the river, while at an offshore marine site, 55 % of integral production was at or below the pycnocline, under low PAR. Climate change is likely to increase the sediment and CDOM loading to these waters, which would exacerbate light limitation of photosynthesis throughout the system. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Beaufort Sea Leira Retamal Æ Sylvia Bonilla Æ Warwick F. Vincent |
spellingShingle |
Beaufort Sea Leira Retamal Æ Sylvia Bonilla Æ Warwick F. Vincent ORIGINAL PAPER Optical gradients and phytoplankton production in the Mackenzie River and the coastal |
author_facet |
Beaufort Sea Leira Retamal Æ Sylvia Bonilla Æ Warwick F. Vincent |
author_sort |
Beaufort Sea |
title |
ORIGINAL PAPER Optical gradients and phytoplankton production in the Mackenzie River and the coastal |
title_short |
ORIGINAL PAPER Optical gradients and phytoplankton production in the Mackenzie River and the coastal |
title_full |
ORIGINAL PAPER Optical gradients and phytoplankton production in the Mackenzie River and the coastal |
title_fullStr |
ORIGINAL PAPER Optical gradients and phytoplankton production in the Mackenzie River and the coastal |
title_full_unstemmed |
ORIGINAL PAPER Optical gradients and phytoplankton production in the Mackenzie River and the coastal |
title_sort |
original paper optical gradients and phytoplankton production in the mackenzie river and the coastal |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.474.5112 http://132.203.57.253/warwickvincent/PDFfiles/220.pdf |
geographic |
Arctic Mackenzie River |
geographic_facet |
Arctic Mackenzie River |
genre |
Arctic Climate change Mackenzie river Phytoplankton |
genre_facet |
Arctic Climate change Mackenzie river Phytoplankton |
op_source |
http://132.203.57.253/warwickvincent/PDFfiles/220.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.474.5112 http://132.203.57.253/warwickvincent/PDFfiles/220.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766336437306785792 |