Contrasting glacial meltwater effects on post-bloom phytoplankton on temporal and spatial scales in Kongsfjorden, Spitsbergen
Glacial meltwater discharge in fjords on the west coast of Spitsbergen is increasing due to climate change. The influence of this discharge on phytoplankton nutrient limitation, composition, productivity and photophysiology was investigated in central (M) and inner (G) Kongsfjorden (79°N, 11°40’E)....
Published in: | Elementa: Science of the Anthropocene |
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2018
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Online Access: | https://doi.org/10.1525/elementa.307 https://doaj.org/article/2d1ede086bc1445c8909dc22b0a4548c |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:2d1ede086bc1445c8909dc22b0a4548c 2023-05-15T15:12:20+02:00 Contrasting glacial meltwater effects on post-bloom phytoplankton on temporal and spatial scales in Kongsfjorden, Spitsbergen Willem H. van de Poll Gemma Kulk Patrick D. Rozema Corina P. D. Brussaard Ronald J. W. Visser Anita G. J. Buma 2018-07-01 https://doi.org/10.1525/elementa.307 https://doaj.org/article/2d1ede086bc1445c8909dc22b0a4548c en eng BioOne 2325-1026 doi:10.1525/elementa.307 https://doaj.org/article/2d1ede086bc1445c8909dc22b0a4548c undefined Elementa: Science of the Anthropocene, Vol 6, Iss 1 (2018) Arctic phytoplankton nutrient limitation pigments productivity photophysiology stratification meltwater Kongsfjorden envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.1525/elementa.307 2023-01-22T19:11:42Z Glacial meltwater discharge in fjords on the west coast of Spitsbergen is increasing due to climate change. The influence of this discharge on phytoplankton nutrient limitation, composition, productivity and photophysiology was investigated in central (M) and inner (G) Kongsfjorden (79°N, 11°40’E). Freshwater influx intensified stratification during June 2015, coinciding with surface nutrient depletion. Surface nutrient concentrations were negatively correlated with stratification strength at station M. Here, nitrate addition assays revealed increasing N limitation of surface phytoplankton during the second half of June, which was followed by a pronounced compositional change within the flagellate-dominated phytoplankton community as dictyochophytes (85% of chl 'a') were replaced with smaller haptophytes (up to 60% of chlorophyll 'a') and prasinophytes (20% of chlorophyll 'a'). These changes were less pronounced at station G, where surface phosphate, ammonium and nitrate concentrations were occasionally higher, and correlated with wind direction, suggesting wind-mediated transport of nutrient-enriched waters to this inner location. Therefore, glacial meltwater discharge mediated nutrient enrichment in the inner fjord, and enhanced stratification in inner and central Kongsfjorden. Surface chlorophyll a and water column productivity showed 3–4-fold variability, and did not correlate with nutrient limitation, euphotic zone depth, or changed taxonomic composition. However, the maximum carbon fixation rate and photosynthetic efficiency showed weak positive correlations to prasinophyte, cryptophyte, and haptophyte chlorophyll 'a'. The present study documented relationships between stratification, N limitation, and changed phytoplankton composition, but surface chlorophyll a concentration, phytoplankton photosynthetic characteristics, and water column productivity in Kongsfjorden appeared to be driven by mechanisms other than N limitation. Article in Journal/Newspaper Arctic Climate change Kongsfjord* Kongsfjorden Phytoplankton Spitsbergen Unknown Arctic Elementa: Science of the Anthropocene 6 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
Arctic phytoplankton nutrient limitation pigments productivity photophysiology stratification meltwater Kongsfjorden envir geo |
spellingShingle |
Arctic phytoplankton nutrient limitation pigments productivity photophysiology stratification meltwater Kongsfjorden envir geo Willem H. van de Poll Gemma Kulk Patrick D. Rozema Corina P. D. Brussaard Ronald J. W. Visser Anita G. J. Buma Contrasting glacial meltwater effects on post-bloom phytoplankton on temporal and spatial scales in Kongsfjorden, Spitsbergen |
topic_facet |
Arctic phytoplankton nutrient limitation pigments productivity photophysiology stratification meltwater Kongsfjorden envir geo |
description |
Glacial meltwater discharge in fjords on the west coast of Spitsbergen is increasing due to climate change. The influence of this discharge on phytoplankton nutrient limitation, composition, productivity and photophysiology was investigated in central (M) and inner (G) Kongsfjorden (79°N, 11°40’E). Freshwater influx intensified stratification during June 2015, coinciding with surface nutrient depletion. Surface nutrient concentrations were negatively correlated with stratification strength at station M. Here, nitrate addition assays revealed increasing N limitation of surface phytoplankton during the second half of June, which was followed by a pronounced compositional change within the flagellate-dominated phytoplankton community as dictyochophytes (85% of chl 'a') were replaced with smaller haptophytes (up to 60% of chlorophyll 'a') and prasinophytes (20% of chlorophyll 'a'). These changes were less pronounced at station G, where surface phosphate, ammonium and nitrate concentrations were occasionally higher, and correlated with wind direction, suggesting wind-mediated transport of nutrient-enriched waters to this inner location. Therefore, glacial meltwater discharge mediated nutrient enrichment in the inner fjord, and enhanced stratification in inner and central Kongsfjorden. Surface chlorophyll a and water column productivity showed 3–4-fold variability, and did not correlate with nutrient limitation, euphotic zone depth, or changed taxonomic composition. However, the maximum carbon fixation rate and photosynthetic efficiency showed weak positive correlations to prasinophyte, cryptophyte, and haptophyte chlorophyll 'a'. The present study documented relationships between stratification, N limitation, and changed phytoplankton composition, but surface chlorophyll a concentration, phytoplankton photosynthetic characteristics, and water column productivity in Kongsfjorden appeared to be driven by mechanisms other than N limitation. |
format |
Article in Journal/Newspaper |
author |
Willem H. van de Poll Gemma Kulk Patrick D. Rozema Corina P. D. Brussaard Ronald J. W. Visser Anita G. J. Buma |
author_facet |
Willem H. van de Poll Gemma Kulk Patrick D. Rozema Corina P. D. Brussaard Ronald J. W. Visser Anita G. J. Buma |
author_sort |
Willem H. van de Poll |
title |
Contrasting glacial meltwater effects on post-bloom phytoplankton on temporal and spatial scales in Kongsfjorden, Spitsbergen |
title_short |
Contrasting glacial meltwater effects on post-bloom phytoplankton on temporal and spatial scales in Kongsfjorden, Spitsbergen |
title_full |
Contrasting glacial meltwater effects on post-bloom phytoplankton on temporal and spatial scales in Kongsfjorden, Spitsbergen |
title_fullStr |
Contrasting glacial meltwater effects on post-bloom phytoplankton on temporal and spatial scales in Kongsfjorden, Spitsbergen |
title_full_unstemmed |
Contrasting glacial meltwater effects on post-bloom phytoplankton on temporal and spatial scales in Kongsfjorden, Spitsbergen |
title_sort |
contrasting glacial meltwater effects on post-bloom phytoplankton on temporal and spatial scales in kongsfjorden, spitsbergen |
publisher |
BioOne |
publishDate |
2018 |
url |
https://doi.org/10.1525/elementa.307 https://doaj.org/article/2d1ede086bc1445c8909dc22b0a4548c |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Kongsfjord* Kongsfjorden Phytoplankton Spitsbergen |
genre_facet |
Arctic Climate change Kongsfjord* Kongsfjorden Phytoplankton Spitsbergen |
op_source |
Elementa: Science of the Anthropocene, Vol 6, Iss 1 (2018) |
op_relation |
2325-1026 doi:10.1525/elementa.307 https://doaj.org/article/2d1ede086bc1445c8909dc22b0a4548c |
op_rights |
undefined |
op_doi |
https://doi.org/10.1525/elementa.307 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
6 |
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1766343031878844416 |