Microbial food web responses to light and nutrients beneath the coastal Arctic Ocean sea ice during the winter-spring transition
14 pages, 4 tables, 5 figures.-- Printed version published Dec 2008.-- Issue title: "Sea ice and life in a river-influenced arctic shelf ecosystem". We measured the abundance and biomass of phototrophic and heterotrophic microbes in the upper mixed layer of the water column in ice-covered...
Published in: | Journal of Marine Systems |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
2007
|
Subjects: | |
Online Access: | http://hdl.handle.net/10261/13994 https://doi.org/10.1016/j.jmarsys.2007.11.001 |
id |
ftcsic:oai:digital.csic.es:10261/13994 |
---|---|
record_format |
openpolar |
spelling |
ftcsic:oai:digital.csic.es:10261/13994 2024-02-11T10:01:15+01:00 Microbial food web responses to light and nutrients beneath the coastal Arctic Ocean sea ice during the winter-spring transition Terrado, Ramon Lovejoy, Connie Massana, Ramon Vincent, Warwick F. 2007-11-28 22195 bytes application/pdf http://hdl.handle.net/10261/13994 https://doi.org/10.1016/j.jmarsys.2007.11.001 en eng Elsevier https://doi.org/10.1016/j.jmarsys.2007.11.001 Journal of Marine Systems 74: 964-977 (2008) 0924-7963 http://hdl.handle.net/10261/13994 doi:10.1016/j.jmarsys.2007.11.001 none Protists Phytoplankton Bacteria Nutrients Mixed layer Sea ice Light response artículo http://purl.org/coar/resource_type/c_6501 2007 ftcsic https://doi.org/10.1016/j.jmarsys.2007.11.001 2024-01-16T09:22:53Z 14 pages, 4 tables, 5 figures.-- Printed version published Dec 2008.-- Issue title: "Sea ice and life in a river-influenced arctic shelf ecosystem". We measured the abundance and biomass of phototrophic and heterotrophic microbes in the upper mixed layer of the water column in ice-covered Franklin Bay, Beaufort Sea, Canada, from December 2003 to May 2004, and evaluated the influence of light and nutrients on these communities by way of a shipboard enrichment experiment. Bacterial cell concentrations showed no consistent trends throughout the sampling period, averaging (± SD) 2.4 (0.9) × 108 cells L−1; integrated bacterial biomass for the upper mixed layer ranged from 1.33 mg C m−3 to 3.60 mg C m−3. Small cells numerically dominated the heterotrophic protist community in both winter and spring, but in terms of biomass, protists with a diameter > 10 µm generally dominated the standing stocks. Heterotrophic protist biomass integrated over the upper mixed layer ranged from 1.23 mg C m−3 to 6.56 mg C m−3. Phytoplankton biomass was low and variable, but persisted during the winter period. The standing stock of pigment-containing protists ranged from a minimum value of 0.38 mg C m−3 in winter to a maximal value of 6.09 mg C m−3 in spring and the most abundant taxa were Micromonas-like cells. These picoprasinophytes began to increase under the ice in February and their population size was positively correlated with surface irradiance. Despite the continuing presence of sea ice, phytoplankton biomass rose by more than an order of magnitude in the upper mixed layer by May. The shipboard experiment in April showed that this phototrophic increase in the community was not responsive to pulsed nutrient enrichment, with all treatments showing a strong growth response to improved irradiance conditions. Molecular (DGGE) and microscopic analyses indicated that most components of the eukaryotic community responded positively to the light treatment. These results show the persistence of a phototrophic inoculum throughout ... Article in Journal/Newspaper Arctic Arctic Ocean Beaufort Sea Franklin Bay Phytoplankton Sea ice Digital.CSIC (Spanish National Research Council) Arctic Arctic Ocean Canada Journal of Marine Systems 74 3-4 964 977 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Protists Phytoplankton Bacteria Nutrients Mixed layer Sea ice Light response |
spellingShingle |
Protists Phytoplankton Bacteria Nutrients Mixed layer Sea ice Light response Terrado, Ramon Lovejoy, Connie Massana, Ramon Vincent, Warwick F. Microbial food web responses to light and nutrients beneath the coastal Arctic Ocean sea ice during the winter-spring transition |
topic_facet |
Protists Phytoplankton Bacteria Nutrients Mixed layer Sea ice Light response |
description |
14 pages, 4 tables, 5 figures.-- Printed version published Dec 2008.-- Issue title: "Sea ice and life in a river-influenced arctic shelf ecosystem". We measured the abundance and biomass of phototrophic and heterotrophic microbes in the upper mixed layer of the water column in ice-covered Franklin Bay, Beaufort Sea, Canada, from December 2003 to May 2004, and evaluated the influence of light and nutrients on these communities by way of a shipboard enrichment experiment. Bacterial cell concentrations showed no consistent trends throughout the sampling period, averaging (± SD) 2.4 (0.9) × 108 cells L−1; integrated bacterial biomass for the upper mixed layer ranged from 1.33 mg C m−3 to 3.60 mg C m−3. Small cells numerically dominated the heterotrophic protist community in both winter and spring, but in terms of biomass, protists with a diameter > 10 µm generally dominated the standing stocks. Heterotrophic protist biomass integrated over the upper mixed layer ranged from 1.23 mg C m−3 to 6.56 mg C m−3. Phytoplankton biomass was low and variable, but persisted during the winter period. The standing stock of pigment-containing protists ranged from a minimum value of 0.38 mg C m−3 in winter to a maximal value of 6.09 mg C m−3 in spring and the most abundant taxa were Micromonas-like cells. These picoprasinophytes began to increase under the ice in February and their population size was positively correlated with surface irradiance. Despite the continuing presence of sea ice, phytoplankton biomass rose by more than an order of magnitude in the upper mixed layer by May. The shipboard experiment in April showed that this phototrophic increase in the community was not responsive to pulsed nutrient enrichment, with all treatments showing a strong growth response to improved irradiance conditions. Molecular (DGGE) and microscopic analyses indicated that most components of the eukaryotic community responded positively to the light treatment. These results show the persistence of a phototrophic inoculum throughout ... |
format |
Article in Journal/Newspaper |
author |
Terrado, Ramon Lovejoy, Connie Massana, Ramon Vincent, Warwick F. |
author_facet |
Terrado, Ramon Lovejoy, Connie Massana, Ramon Vincent, Warwick F. |
author_sort |
Terrado, Ramon |
title |
Microbial food web responses to light and nutrients beneath the coastal Arctic Ocean sea ice during the winter-spring transition |
title_short |
Microbial food web responses to light and nutrients beneath the coastal Arctic Ocean sea ice during the winter-spring transition |
title_full |
Microbial food web responses to light and nutrients beneath the coastal Arctic Ocean sea ice during the winter-spring transition |
title_fullStr |
Microbial food web responses to light and nutrients beneath the coastal Arctic Ocean sea ice during the winter-spring transition |
title_full_unstemmed |
Microbial food web responses to light and nutrients beneath the coastal Arctic Ocean sea ice during the winter-spring transition |
title_sort |
microbial food web responses to light and nutrients beneath the coastal arctic ocean sea ice during the winter-spring transition |
publisher |
Elsevier |
publishDate |
2007 |
url |
http://hdl.handle.net/10261/13994 https://doi.org/10.1016/j.jmarsys.2007.11.001 |
geographic |
Arctic Arctic Ocean Canada |
geographic_facet |
Arctic Arctic Ocean Canada |
genre |
Arctic Arctic Ocean Beaufort Sea Franklin Bay Phytoplankton Sea ice |
genre_facet |
Arctic Arctic Ocean Beaufort Sea Franklin Bay Phytoplankton Sea ice |
op_relation |
https://doi.org/10.1016/j.jmarsys.2007.11.001 Journal of Marine Systems 74: 964-977 (2008) 0924-7963 http://hdl.handle.net/10261/13994 doi:10.1016/j.jmarsys.2007.11.001 |
op_rights |
none |
op_doi |
https://doi.org/10.1016/j.jmarsys.2007.11.001 |
container_title |
Journal of Marine Systems |
container_volume |
74 |
container_issue |
3-4 |
container_start_page |
964 |
op_container_end_page |
977 |
_version_ |
1790597044993261568 |