Phytoplankton community structure in the Lena Delta (Siberia, Russia) in relation to hydrography
The Lena Delta in Northern Siberia is one of the largest river deltas in the world. During peak discharge, after the ice melt in spring, it delivers between 60–8000 m 3 s −1 of water and sediment into the Arctic Ocean. The Lena Delta and the Laptev Sea coast also constitute a continuous permafrost r...
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ftdoajarticles:oai:doaj.org/article:3a9585ccbf9c43619b5591bfcc1bfe72 2023-05-15T14:56:51+02:00 Phytoplankton community structure in the Lena Delta (Siberia, Russia) in relation to hydrography A. C. Kraberg E. Druzhkova B. Heim M. J. G. Loeder K. H. Wiltshire 2013-11-01T00:00:00Z https://doi.org/10.5194/bg-10-7263-2013 https://doaj.org/article/3a9585ccbf9c43619b5591bfcc1bfe72 EN eng Copernicus Publications http://www.biogeosciences.net/10/7263/2013/bg-10-7263-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-10-7263-2013 https://doaj.org/article/3a9585ccbf9c43619b5591bfcc1bfe72 Biogeosciences, Vol 10, Iss 11, Pp 7263-7277 (2013) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2013 ftdoajarticles https://doi.org/10.5194/bg-10-7263-2013 2022-12-31T03:44:11Z The Lena Delta in Northern Siberia is one of the largest river deltas in the world. During peak discharge, after the ice melt in spring, it delivers between 60–8000 m 3 s −1 of water and sediment into the Arctic Ocean. The Lena Delta and the Laptev Sea coast also constitute a continuous permafrost region. Ongoing climate change, which is particularly pronounced in the Arctic, is leading to increased rates of permafrost thaw. This has already profoundly altered the discharge rates of the Lena River. But the chemistry of the river waters which are discharged into the coastal Laptev Sea have also been hypothesized to undergo considerable compositional changes, e.g. by increasing concentrations of inorganic nutrients such as dissolved organic carbon (DOC) and methane. These physical and chemical changes will also affect the composition of the phytoplankton communities. However, before potential consequences of climate change for coastal arctic phytoplankton communities can be judged, the inherent status of the diversity and food web interactions within the delta have to be established. In 2010, as part of the AWI Lena Delta programme, the phyto- and microzooplankton community in three river channels of the delta (Trofimov, Bykov and Olenek) as well as four coastal transects were investigated to capture the typical river phytoplankton communities and the transitional zone of brackish/marine conditions. Most CTD profiles from 23 coastal stations showed very strong stratification. The only exception to this was a small, shallow and mixed area running from the outflow of Bykov channel in a northerly direction parallel to the shore. Of the five stations in this area, three had a salinity of close to zero. Two further stations had salinities of around 2 and 5 throughout the water column. In the remaining transects, on the other hand, salinities varied between 5 and 30 with depth. Phytoplankton counts from the outflow from the Lena were dominated by diatoms ( Aulacoseira species) cyanobacteria ( Aphanizomenon , ... Article in Journal/Newspaper Arctic Arctic Ocean Climate change Ice laptev Laptev Sea lena delta lena river permafrost Phytoplankton Siberia Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Laptev Sea Bykov ENVELOPE(155.258,155.258,50.158,50.158) Biogeosciences 10 11 7263 7277 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 A. C. Kraberg E. Druzhkova B. Heim M. J. G. Loeder K. H. Wiltshire Phytoplankton community structure in the Lena Delta (Siberia, Russia) in relation to hydrography |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The Lena Delta in Northern Siberia is one of the largest river deltas in the world. During peak discharge, after the ice melt in spring, it delivers between 60–8000 m 3 s −1 of water and sediment into the Arctic Ocean. The Lena Delta and the Laptev Sea coast also constitute a continuous permafrost region. Ongoing climate change, which is particularly pronounced in the Arctic, is leading to increased rates of permafrost thaw. This has already profoundly altered the discharge rates of the Lena River. But the chemistry of the river waters which are discharged into the coastal Laptev Sea have also been hypothesized to undergo considerable compositional changes, e.g. by increasing concentrations of inorganic nutrients such as dissolved organic carbon (DOC) and methane. These physical and chemical changes will also affect the composition of the phytoplankton communities. However, before potential consequences of climate change for coastal arctic phytoplankton communities can be judged, the inherent status of the diversity and food web interactions within the delta have to be established. In 2010, as part of the AWI Lena Delta programme, the phyto- and microzooplankton community in three river channels of the delta (Trofimov, Bykov and Olenek) as well as four coastal transects were investigated to capture the typical river phytoplankton communities and the transitional zone of brackish/marine conditions. Most CTD profiles from 23 coastal stations showed very strong stratification. The only exception to this was a small, shallow and mixed area running from the outflow of Bykov channel in a northerly direction parallel to the shore. Of the five stations in this area, three had a salinity of close to zero. Two further stations had salinities of around 2 and 5 throughout the water column. In the remaining transects, on the other hand, salinities varied between 5 and 30 with depth. Phytoplankton counts from the outflow from the Lena were dominated by diatoms ( Aulacoseira species) cyanobacteria ( Aphanizomenon , ... |
format |
Article in Journal/Newspaper |
author |
A. C. Kraberg E. Druzhkova B. Heim M. J. G. Loeder K. H. Wiltshire |
author_facet |
A. C. Kraberg E. Druzhkova B. Heim M. J. G. Loeder K. H. Wiltshire |
author_sort |
A. C. Kraberg |
title |
Phytoplankton community structure in the Lena Delta (Siberia, Russia) in relation to hydrography |
title_short |
Phytoplankton community structure in the Lena Delta (Siberia, Russia) in relation to hydrography |
title_full |
Phytoplankton community structure in the Lena Delta (Siberia, Russia) in relation to hydrography |
title_fullStr |
Phytoplankton community structure in the Lena Delta (Siberia, Russia) in relation to hydrography |
title_full_unstemmed |
Phytoplankton community structure in the Lena Delta (Siberia, Russia) in relation to hydrography |
title_sort |
phytoplankton community structure in the lena delta (siberia, russia) in relation to hydrography |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/bg-10-7263-2013 https://doaj.org/article/3a9585ccbf9c43619b5591bfcc1bfe72 |
long_lat |
ENVELOPE(155.258,155.258,50.158,50.158) |
geographic |
Arctic Arctic Ocean Laptev Sea Bykov |
geographic_facet |
Arctic Arctic Ocean Laptev Sea Bykov |
genre |
Arctic Arctic Ocean Climate change Ice laptev Laptev Sea lena delta lena river permafrost Phytoplankton Siberia |
genre_facet |
Arctic Arctic Ocean Climate change Ice laptev Laptev Sea lena delta lena river permafrost Phytoplankton Siberia |
op_source |
Biogeosciences, Vol 10, Iss 11, Pp 7263-7277 (2013) |
op_relation |
http://www.biogeosciences.net/10/7263/2013/bg-10-7263-2013.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 1726-4170 1726-4189 doi:10.5194/bg-10-7263-2013 https://doaj.org/article/3a9585ccbf9c43619b5591bfcc1bfe72 |
op_doi |
https://doi.org/10.5194/bg-10-7263-2013 |
container_title |
Biogeosciences |
container_volume |
10 |
container_issue |
11 |
container_start_page |
7263 |
op_container_end_page |
7277 |
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1766328910062026752 |