Diatom abundance counted on water bottle samples from the EisenEx cruise to the Southern Ocean, supplement to: Assmy, Philipp; Henjes, Joachim; Klaas, Christine; Smetacek, Victor (2007): Mechanisms determining species dominance in a phytoplankton bloom induced by the iron fertilization experiment EisenEx in the Southern Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 340-362
The dynamics of phytoplankton species populations recorded during the 3-week, iron-fertilization experiment EisenEx carried out in spring in the Antarctic Polar Frontal Zone are presented and discussed as the difference between growth and mortality rates. Only two cosmopolitan diatom species, the ce...
Main Authors: | , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
PANGAEA - Data Publisher for Earth & Environmental Science
2007
|
Subjects: | |
Online Access: | https://dx.doi.org/10.1594/pangaea.552191 https://doi.pangaea.de/10.1594/PANGAEA.552191 |
id |
ftdatacite:10.1594/pangaea.552191 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.1594/pangaea.552191 2023-05-15T13:47:06+02:00 Diatom abundance counted on water bottle samples from the EisenEx cruise to the Southern Ocean, supplement to: Assmy, Philipp; Henjes, Joachim; Klaas, Christine; Smetacek, Victor (2007): Mechanisms determining species dominance in a phytoplankton bloom induced by the iron fertilization experiment EisenEx in the Southern Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 340-362 Assmy, Philipp Henjes, Joachim Klaas, Christine Smetacek, Victor 2007 application/zip https://dx.doi.org/10.1594/pangaea.552191 https://doi.pangaea.de/10.1594/PANGAEA.552191 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.1016/j.dsr.2006.12.005 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY CTD/Rosette ANT-XVIII/2 Polarstern European Iron Enrichment Experiment in the Southern Ocean EisenEx Collection article Supplementary Collection of Datasets 2007 ftdatacite https://doi.org/10.1594/pangaea.552191 https://doi.org/10.1016/j.dsr.2006.12.005 2021-11-05T12:55:41Z The dynamics of phytoplankton species populations recorded during the 3-week, iron-fertilization experiment EisenEx carried out in spring in the Antarctic Polar Frontal Zone are presented and discussed as the difference between growth and mortality rates. Only two cosmopolitan diatom species, the centric Chaetoceros debilis and the pennate Pseudo-nitzschia lineola, increased population density exponentially throughout the experiment to 150-fold and 90-fold of initial values respectively. Because C. debilis initial abundance was tenfold lower than that of P. lineola, the two contributed 1 % and 21 % to bloom biomass respectively at the end of the experiment, high-lighting the role of seeding in bloom formation. The other significant species increased population size at a linear rate throughout the experiment or for a short spurt phase to 3 to 18-fold of initial values. Conservative estimates of mortality rates within diatom species populations were obtained by comparing net accumulation rates of full cells with those of empty and broken frustules. The ratios were consistent over time for the various species but varied widely between them. The species-specific variation can be explained by differences in both growth and mortality rates, the latter partly due to either selective grazing or avoidance by the large protozoo- and metazooplankton populations present. Selective predation by the abundant copepod populations on protistan grazers (ciliates and heterotrophic dinoflagellates) of diatoms apparently aided diatom biomass build-up. The response patterns of populations of the phytoplankton species present fall into 6 categories comprising disparate species, indicating that phylogeny is a poor predictor of ecology. The group that did not respond to fertilization was the most diverse and included both endemic and cosmopolitan as well as background and bloom-forming species. This lack of response to the advent of favorable growth conditions indicates that proximate factors during EisenEx triggered growth only in some species but had little effect on others. We attribute the differences in behavior to ultimate factors such as seasonal effects on life cycles and other internal constraints on growth rates. The implications for our understanding of the evolutionary ecology of phytoplankton and its impact on global biogeochemical cycles are pointed out. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
CTD/Rosette ANT-XVIII/2 Polarstern European Iron Enrichment Experiment in the Southern Ocean EisenEx |
spellingShingle |
CTD/Rosette ANT-XVIII/2 Polarstern European Iron Enrichment Experiment in the Southern Ocean EisenEx Assmy, Philipp Henjes, Joachim Klaas, Christine Smetacek, Victor Diatom abundance counted on water bottle samples from the EisenEx cruise to the Southern Ocean, supplement to: Assmy, Philipp; Henjes, Joachim; Klaas, Christine; Smetacek, Victor (2007): Mechanisms determining species dominance in a phytoplankton bloom induced by the iron fertilization experiment EisenEx in the Southern Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 340-362 |
topic_facet |
CTD/Rosette ANT-XVIII/2 Polarstern European Iron Enrichment Experiment in the Southern Ocean EisenEx |
description |
The dynamics of phytoplankton species populations recorded during the 3-week, iron-fertilization experiment EisenEx carried out in spring in the Antarctic Polar Frontal Zone are presented and discussed as the difference between growth and mortality rates. Only two cosmopolitan diatom species, the centric Chaetoceros debilis and the pennate Pseudo-nitzschia lineola, increased population density exponentially throughout the experiment to 150-fold and 90-fold of initial values respectively. Because C. debilis initial abundance was tenfold lower than that of P. lineola, the two contributed 1 % and 21 % to bloom biomass respectively at the end of the experiment, high-lighting the role of seeding in bloom formation. The other significant species increased population size at a linear rate throughout the experiment or for a short spurt phase to 3 to 18-fold of initial values. Conservative estimates of mortality rates within diatom species populations were obtained by comparing net accumulation rates of full cells with those of empty and broken frustules. The ratios were consistent over time for the various species but varied widely between them. The species-specific variation can be explained by differences in both growth and mortality rates, the latter partly due to either selective grazing or avoidance by the large protozoo- and metazooplankton populations present. Selective predation by the abundant copepod populations on protistan grazers (ciliates and heterotrophic dinoflagellates) of diatoms apparently aided diatom biomass build-up. The response patterns of populations of the phytoplankton species present fall into 6 categories comprising disparate species, indicating that phylogeny is a poor predictor of ecology. The group that did not respond to fertilization was the most diverse and included both endemic and cosmopolitan as well as background and bloom-forming species. This lack of response to the advent of favorable growth conditions indicates that proximate factors during EisenEx triggered growth only in some species but had little effect on others. We attribute the differences in behavior to ultimate factors such as seasonal effects on life cycles and other internal constraints on growth rates. The implications for our understanding of the evolutionary ecology of phytoplankton and its impact on global biogeochemical cycles are pointed out. |
format |
Article in Journal/Newspaper |
author |
Assmy, Philipp Henjes, Joachim Klaas, Christine Smetacek, Victor |
author_facet |
Assmy, Philipp Henjes, Joachim Klaas, Christine Smetacek, Victor |
author_sort |
Assmy, Philipp |
title |
Diatom abundance counted on water bottle samples from the EisenEx cruise to the Southern Ocean, supplement to: Assmy, Philipp; Henjes, Joachim; Klaas, Christine; Smetacek, Victor (2007): Mechanisms determining species dominance in a phytoplankton bloom induced by the iron fertilization experiment EisenEx in the Southern Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 340-362 |
title_short |
Diatom abundance counted on water bottle samples from the EisenEx cruise to the Southern Ocean, supplement to: Assmy, Philipp; Henjes, Joachim; Klaas, Christine; Smetacek, Victor (2007): Mechanisms determining species dominance in a phytoplankton bloom induced by the iron fertilization experiment EisenEx in the Southern Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 340-362 |
title_full |
Diatom abundance counted on water bottle samples from the EisenEx cruise to the Southern Ocean, supplement to: Assmy, Philipp; Henjes, Joachim; Klaas, Christine; Smetacek, Victor (2007): Mechanisms determining species dominance in a phytoplankton bloom induced by the iron fertilization experiment EisenEx in the Southern Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 340-362 |
title_fullStr |
Diatom abundance counted on water bottle samples from the EisenEx cruise to the Southern Ocean, supplement to: Assmy, Philipp; Henjes, Joachim; Klaas, Christine; Smetacek, Victor (2007): Mechanisms determining species dominance in a phytoplankton bloom induced by the iron fertilization experiment EisenEx in the Southern Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 340-362 |
title_full_unstemmed |
Diatom abundance counted on water bottle samples from the EisenEx cruise to the Southern Ocean, supplement to: Assmy, Philipp; Henjes, Joachim; Klaas, Christine; Smetacek, Victor (2007): Mechanisms determining species dominance in a phytoplankton bloom induced by the iron fertilization experiment EisenEx in the Southern Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 54(3), 340-362 |
title_sort |
diatom abundance counted on water bottle samples from the eisenex cruise to the southern ocean, supplement to: assmy, philipp; henjes, joachim; klaas, christine; smetacek, victor (2007): mechanisms determining species dominance in a phytoplankton bloom induced by the iron fertilization experiment eisenex in the southern ocean. deep sea research part i: oceanographic research papers, 54(3), 340-362 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2007 |
url |
https://dx.doi.org/10.1594/pangaea.552191 https://doi.pangaea.de/10.1594/PANGAEA.552191 |
geographic |
Antarctic Southern Ocean The Antarctic |
geographic_facet |
Antarctic Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://dx.doi.org/10.1016/j.dsr.2006.12.005 |
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.552191 https://doi.org/10.1016/j.dsr.2006.12.005 |
_version_ |
1766246345821126656 |