Composition, buoyancy regulation and fate of ice algal aggregates in the Central Arctic Ocean.
Sea-ice diatoms are known to accumulate in large aggregates in and under sea ice and in melt ponds. There is recent evidence from the Arctic that such aggregates can contribute substantially to particle export when sinking from the ice. The role and regulation of microbial aggregation in the highly...
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ftdoajarticles:oai:doaj.org/article:736698d7b29845f0b71b959df3af17ec 2023-05-15T14:47:06+02:00 Composition, buoyancy regulation and fate of ice algal aggregates in the Central Arctic Ocean. Mar Fernández-Méndez Frank Wenzhöfer Ilka Peeken Heidi L Sørensen Ronnie N Glud Antje Boetius 2014-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0107452 https://doaj.org/article/736698d7b29845f0b71b959df3af17ec EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC4160247?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0107452 https://doaj.org/article/736698d7b29845f0b71b959df3af17ec PLoS ONE, Vol 9, Iss 9, p e107452 (2014) Medicine R Science Q article 2014 ftdoajarticles https://doi.org/10.1371/journal.pone.0107452 2022-12-30T22:28:02Z Sea-ice diatoms are known to accumulate in large aggregates in and under sea ice and in melt ponds. There is recent evidence from the Arctic that such aggregates can contribute substantially to particle export when sinking from the ice. The role and regulation of microbial aggregation in the highly seasonal, nutrient- and light-limited Arctic sea-ice ecosystem is not well understood. To elucidate the mechanisms controlling the formation and export of algal aggregates from sea ice, we investigated samples taken in late summer 2011 and 2012, during two cruises to the Eurasian Basin of the Central Arctic Ocean. Spherical aggregates densely packed with pennate diatoms, as well as filamentous aggregates formed by Melosira arctica showed sign of different stages of degradation and physiological stoichiometries, with carbon to chlorophyll a ratios ranging from 110 to 66700, and carbon to nitrogen molar ratios of 8-35 and 9-40, respectively. Sub-ice algal aggregate densities ranged between 1 and 17 aggregates m(-2), maintaining an estimated net primary production of 0.4-40 mg C m(-2) d(-1), and accounted for 3-80% of total phototrophic biomass and up to 94% of local net primary production. A potential factor controlling the buoyancy of the aggregates was light intensity, regulating photosynthetic oxygen production and the amount of gas bubbles trapped within the mucous matrix, even at low ambient nutrient concentrations. Our data-set was used to evaluate the distribution and importance of Arctic algal aggregates as carbon source for pelagic and benthic communities. Article in Journal/Newspaper Arctic Arctic Ocean Sea ice Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean PLoS ONE 9 9 e107452 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Mar Fernández-Méndez Frank Wenzhöfer Ilka Peeken Heidi L Sørensen Ronnie N Glud Antje Boetius Composition, buoyancy regulation and fate of ice algal aggregates in the Central Arctic Ocean. |
topic_facet |
Medicine R Science Q |
description |
Sea-ice diatoms are known to accumulate in large aggregates in and under sea ice and in melt ponds. There is recent evidence from the Arctic that such aggregates can contribute substantially to particle export when sinking from the ice. The role and regulation of microbial aggregation in the highly seasonal, nutrient- and light-limited Arctic sea-ice ecosystem is not well understood. To elucidate the mechanisms controlling the formation and export of algal aggregates from sea ice, we investigated samples taken in late summer 2011 and 2012, during two cruises to the Eurasian Basin of the Central Arctic Ocean. Spherical aggregates densely packed with pennate diatoms, as well as filamentous aggregates formed by Melosira arctica showed sign of different stages of degradation and physiological stoichiometries, with carbon to chlorophyll a ratios ranging from 110 to 66700, and carbon to nitrogen molar ratios of 8-35 and 9-40, respectively. Sub-ice algal aggregate densities ranged between 1 and 17 aggregates m(-2), maintaining an estimated net primary production of 0.4-40 mg C m(-2) d(-1), and accounted for 3-80% of total phototrophic biomass and up to 94% of local net primary production. A potential factor controlling the buoyancy of the aggregates was light intensity, regulating photosynthetic oxygen production and the amount of gas bubbles trapped within the mucous matrix, even at low ambient nutrient concentrations. Our data-set was used to evaluate the distribution and importance of Arctic algal aggregates as carbon source for pelagic and benthic communities. |
format |
Article in Journal/Newspaper |
author |
Mar Fernández-Méndez Frank Wenzhöfer Ilka Peeken Heidi L Sørensen Ronnie N Glud Antje Boetius |
author_facet |
Mar Fernández-Méndez Frank Wenzhöfer Ilka Peeken Heidi L Sørensen Ronnie N Glud Antje Boetius |
author_sort |
Mar Fernández-Méndez |
title |
Composition, buoyancy regulation and fate of ice algal aggregates in the Central Arctic Ocean. |
title_short |
Composition, buoyancy regulation and fate of ice algal aggregates in the Central Arctic Ocean. |
title_full |
Composition, buoyancy regulation and fate of ice algal aggregates in the Central Arctic Ocean. |
title_fullStr |
Composition, buoyancy regulation and fate of ice algal aggregates in the Central Arctic Ocean. |
title_full_unstemmed |
Composition, buoyancy regulation and fate of ice algal aggregates in the Central Arctic Ocean. |
title_sort |
composition, buoyancy regulation and fate of ice algal aggregates in the central arctic ocean. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2014 |
url |
https://doi.org/10.1371/journal.pone.0107452 https://doaj.org/article/736698d7b29845f0b71b959df3af17ec |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean Sea ice |
genre_facet |
Arctic Arctic Ocean Sea ice |
op_source |
PLoS ONE, Vol 9, Iss 9, p e107452 (2014) |
op_relation |
http://europepmc.org/articles/PMC4160247?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0107452 https://doaj.org/article/736698d7b29845f0b71b959df3af17ec |
op_doi |
https://doi.org/10.1371/journal.pone.0107452 |
container_title |
PLoS ONE |
container_volume |
9 |
container_issue |
9 |
container_start_page |
e107452 |
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1766318239256674304 |