Microbiology of the IN- and OUT-patch defined iron-fertilized areas in the Southern Ocean, supplement to: Hall, Julie A; Safi, Karl A (2001): The impact of in situ Fe fertilisation on the microbial food web in the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 48(11-12), 2591-2613
During the Southern Ocean iron release experiment (SOIREE) in February 1999, the composition and dynamics of the microbial food web were studied. SOIREE was a mesoscale experiment with four infusions of Fe into the patch to elevate Fe concentrations inside the patch. During the 13 d experiment, samp...
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ftdatacite:10.1594/pangaea.787886 2023-05-15T18:24:58+02:00 Microbiology of the IN- and OUT-patch defined iron-fertilized areas in the Southern Ocean, supplement to: Hall, Julie A; Safi, Karl A (2001): The impact of in situ Fe fertilisation on the microbial food web in the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 48(11-12), 2591-2613 Hall, Julie A Safi, Karl A 2001 application/zip https://dx.doi.org/10.1594/pangaea.787886 https://doi.pangaea.de/10.1594/PANGAEA.787886 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/s0967-0645(01)00010-8 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Joint Global Ocean Flux Study JGOFS Collection article Supplementary Collection of Datasets 2001 ftdatacite https://doi.org/10.1594/pangaea.787886 https://doi.org/10.1016/s0967-0645(01)00010-8 2021-11-05T12:55:41Z During the Southern Ocean iron release experiment (SOIREE) in February 1999, the composition and dynamics of the microbial food web were studied. SOIREE was a mesoscale experiment with four infusions of Fe into the patch to elevate Fe concentrations inside the patch. During the 13 d experiment, samples were collected from the mixed layer inside and outside the patch for the enumeration of bacteria, picophytoplankton, phyto and heterotrophic nanoflagellates, ciliates, and for estimation of bacterial production and microzooplankton grazing. Inside the patch, bacterial numbers remained constant throughout SOIREE although bacterial production increased three-fold. A strong relationship between the increase in bacterial and primary production suggested that dissolved organic carbon and nitrogen, rather than Fe, potentially limited bacterial growth. The picophytoplankton population, was composed solely of eukaryotic cells and increased three-fold over the first 7 d of the experiment before decreasing to initial concentrations of approximately 4000 cells/ml. In contrast to the bacterial and picophytoplankton populations, the nanophytoflagellate population increased six-fold in numbers and 23-fold in biomass. This resulted in a three-fold increase in carbon flow through the microbial food web inside the patch by the end of the experiment. The increased carbon flow resulted in a small increase in total microzooplankton biomass. Ciliate abundances tripled and biomass, doubled; however, the ciliate population only contributed 3-10% of the microzooplankton biomass, which was dominated by the heterotrophic nanoflagellate population. The heterotrophic nanoflagellate numbers decreased three-fold by the end of the experiment; however, there was no significant change in biomass throughout the experiment. The changes in the dynamics and structure of the microbial food web during the SOIREE experiment suggest that microzooplankton grazing controlled the bacterial and possibly the picophytoplankton populations. In contrast, the nanophytoflagellates were initially controlled by the Fe concentration, with microzooplankton having an impact on the population towards the end of the experiment. The addition of Fe to a small patch of the Southern Ocean had a considerable impact on the microbial components of the food web, even though the overall importance of the microbial pathways decreased as a result of Fe addition. Article in Journal/Newspaper Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Southern Ocean |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Joint Global Ocean Flux Study JGOFS |
spellingShingle |
Joint Global Ocean Flux Study JGOFS Hall, Julie A Safi, Karl A Microbiology of the IN- and OUT-patch defined iron-fertilized areas in the Southern Ocean, supplement to: Hall, Julie A; Safi, Karl A (2001): The impact of in situ Fe fertilisation on the microbial food web in the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 48(11-12), 2591-2613 |
topic_facet |
Joint Global Ocean Flux Study JGOFS |
description |
During the Southern Ocean iron release experiment (SOIREE) in February 1999, the composition and dynamics of the microbial food web were studied. SOIREE was a mesoscale experiment with four infusions of Fe into the patch to elevate Fe concentrations inside the patch. During the 13 d experiment, samples were collected from the mixed layer inside and outside the patch for the enumeration of bacteria, picophytoplankton, phyto and heterotrophic nanoflagellates, ciliates, and for estimation of bacterial production and microzooplankton grazing. Inside the patch, bacterial numbers remained constant throughout SOIREE although bacterial production increased three-fold. A strong relationship between the increase in bacterial and primary production suggested that dissolved organic carbon and nitrogen, rather than Fe, potentially limited bacterial growth. The picophytoplankton population, was composed solely of eukaryotic cells and increased three-fold over the first 7 d of the experiment before decreasing to initial concentrations of approximately 4000 cells/ml. In contrast to the bacterial and picophytoplankton populations, the nanophytoflagellate population increased six-fold in numbers and 23-fold in biomass. This resulted in a three-fold increase in carbon flow through the microbial food web inside the patch by the end of the experiment. The increased carbon flow resulted in a small increase in total microzooplankton biomass. Ciliate abundances tripled and biomass, doubled; however, the ciliate population only contributed 3-10% of the microzooplankton biomass, which was dominated by the heterotrophic nanoflagellate population. The heterotrophic nanoflagellate numbers decreased three-fold by the end of the experiment; however, there was no significant change in biomass throughout the experiment. The changes in the dynamics and structure of the microbial food web during the SOIREE experiment suggest that microzooplankton grazing controlled the bacterial and possibly the picophytoplankton populations. In contrast, the nanophytoflagellates were initially controlled by the Fe concentration, with microzooplankton having an impact on the population towards the end of the experiment. The addition of Fe to a small patch of the Southern Ocean had a considerable impact on the microbial components of the food web, even though the overall importance of the microbial pathways decreased as a result of Fe addition. |
format |
Article in Journal/Newspaper |
author |
Hall, Julie A Safi, Karl A |
author_facet |
Hall, Julie A Safi, Karl A |
author_sort |
Hall, Julie A |
title |
Microbiology of the IN- and OUT-patch defined iron-fertilized areas in the Southern Ocean, supplement to: Hall, Julie A; Safi, Karl A (2001): The impact of in situ Fe fertilisation on the microbial food web in the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 48(11-12), 2591-2613 |
title_short |
Microbiology of the IN- and OUT-patch defined iron-fertilized areas in the Southern Ocean, supplement to: Hall, Julie A; Safi, Karl A (2001): The impact of in situ Fe fertilisation on the microbial food web in the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 48(11-12), 2591-2613 |
title_full |
Microbiology of the IN- and OUT-patch defined iron-fertilized areas in the Southern Ocean, supplement to: Hall, Julie A; Safi, Karl A (2001): The impact of in situ Fe fertilisation on the microbial food web in the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 48(11-12), 2591-2613 |
title_fullStr |
Microbiology of the IN- and OUT-patch defined iron-fertilized areas in the Southern Ocean, supplement to: Hall, Julie A; Safi, Karl A (2001): The impact of in situ Fe fertilisation on the microbial food web in the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 48(11-12), 2591-2613 |
title_full_unstemmed |
Microbiology of the IN- and OUT-patch defined iron-fertilized areas in the Southern Ocean, supplement to: Hall, Julie A; Safi, Karl A (2001): The impact of in situ Fe fertilisation on the microbial food web in the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 48(11-12), 2591-2613 |
title_sort |
microbiology of the in- and out-patch defined iron-fertilized areas in the southern ocean, supplement to: hall, julie a; safi, karl a (2001): the impact of in situ fe fertilisation on the microbial food web in the southern ocean. deep sea research part ii: topical studies in oceanography, 48(11-12), 2591-2613 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2001 |
url |
https://dx.doi.org/10.1594/pangaea.787886 https://doi.pangaea.de/10.1594/PANGAEA.787886 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_relation |
https://dx.doi.org/10.1016/s0967-0645(01)00010-8 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.787886 https://doi.org/10.1016/s0967-0645(01)00010-8 |
_version_ |
1766206026777886720 |