Temporal development and vertical distribution of major components of the plankton assemblage during an iron fertilization experiment in the Antarctic Polar Frontal Zone
During the iron fertilization experiment EisenEx conducted in the Antarctic Polar Frontal Zone the response of the plankton community to iron addition was studied in detail. Within the diatom assemblage four major response types could be distinguished inside the fertilized patch. Fast growing and we...
Main Author: | |
---|---|
Other Authors: | , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
Universität Bremen
2004
|
Subjects: | |
Online Access: | https://media.suub.uni-bremen.de/handle/elib/2004 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000008994 |
id |
ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/2004 |
---|---|
record_format |
openpolar |
spelling |
ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/2004 2023-05-15T13:42:30+02:00 Temporal development and vertical distribution of major components of the plankton assemblage during an iron fertilization experiment in the Antarctic Polar Frontal Zone Zeitliche Entwicklung and vertikale Verteilung von Hauptkomponenten der Planktongemeinschaft während eines Eisendüngungsexperiments in der antarktischen Polarfrontzone Assmy, Philipp Smetacek, Victor Kirst, Gunter-Otto 2004-06-01 application/msword https://media.suub.uni-bremen.de/handle/elib/2004 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000008994 eng eng Universität Bremen FB2 Biologie/Chemie https://media.suub.uni-bremen.de/handle/elib/2004 urn:nbn:de:gbv:46-diss000008994 info:eu-repo/semantics/openAccess iron fertilization diatoms vertical distribution broken and intact empty diatom frustules Phaeocystis Coccolithophres Dinoflagellates Dictyocha 31 ddc:31 Dissertation doctoralThesis 2004 ftsubbremen 2022-11-09T07:09:42Z During the iron fertilization experiment EisenEx conducted in the Antarctic Polar Frontal Zone the response of the plankton community to iron addition was studied in detail. Within the diatom assemblage four major response types could be distinguished inside the fertilized patch. Fast growing and weakly silicified diatoms like Pseudo-nitzschia lineola and Chaetoceros curvisetus exhibited exponential growth rates throughout the experiment. The heavily silicified species Fragilariopsis kerguelensis and Thalassionema nitzschioides showed an initial phase with negligible growth during the first week followed by a linear increase in abundance thereafter. Two large solitary and weakly silicified diatoms, Haslea sp. and Corethron pennatum, exhibited a linear growth with no initial lag phase. The small diatom species Nitzschia sp. and Cylindrotheca closterium were characterised by an initial linear increase and a decline during the second half of the experiment. The response of major components of the non-diatom phytoplankton assemblage, including Phaeocystis antarctica, phototrophic dinoflagellates, coccolithophores and Dictyocha speculum, to iron addition accounted for only a minor iron-induced biomass increase. In addition to life diatom cells intact empty and broken diatom frustules were also accounted for in this study as indicators of diatom mortality. The increase of both broken and intact empty frustules inside the patch indicates an increased grazing pressure by proto- and metazoen grazers. The vertical distribution of non-motile particles and planktonic organisms comprises another important aspect of this study. Whereas motile planktonic organisms are able to regulate their position in the water column by active swimming non-motile particles will eventually sink out of the surface layer. Various processes affect the composition and magnitude of non-motile particles of biological origin of which grazing seemed to have played the major role during this study. Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctica Antarktis* Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Antarctic The Antarctic |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
iron fertilization diatoms vertical distribution broken and intact empty diatom frustules Phaeocystis Coccolithophres Dinoflagellates Dictyocha 31 ddc:31 |
spellingShingle |
iron fertilization diatoms vertical distribution broken and intact empty diatom frustules Phaeocystis Coccolithophres Dinoflagellates Dictyocha 31 ddc:31 Assmy, Philipp Temporal development and vertical distribution of major components of the plankton assemblage during an iron fertilization experiment in the Antarctic Polar Frontal Zone |
topic_facet |
iron fertilization diatoms vertical distribution broken and intact empty diatom frustules Phaeocystis Coccolithophres Dinoflagellates Dictyocha 31 ddc:31 |
description |
During the iron fertilization experiment EisenEx conducted in the Antarctic Polar Frontal Zone the response of the plankton community to iron addition was studied in detail. Within the diatom assemblage four major response types could be distinguished inside the fertilized patch. Fast growing and weakly silicified diatoms like Pseudo-nitzschia lineola and Chaetoceros curvisetus exhibited exponential growth rates throughout the experiment. The heavily silicified species Fragilariopsis kerguelensis and Thalassionema nitzschioides showed an initial phase with negligible growth during the first week followed by a linear increase in abundance thereafter. Two large solitary and weakly silicified diatoms, Haslea sp. and Corethron pennatum, exhibited a linear growth with no initial lag phase. The small diatom species Nitzschia sp. and Cylindrotheca closterium were characterised by an initial linear increase and a decline during the second half of the experiment. The response of major components of the non-diatom phytoplankton assemblage, including Phaeocystis antarctica, phototrophic dinoflagellates, coccolithophores and Dictyocha speculum, to iron addition accounted for only a minor iron-induced biomass increase. In addition to life diatom cells intact empty and broken diatom frustules were also accounted for in this study as indicators of diatom mortality. The increase of both broken and intact empty frustules inside the patch indicates an increased grazing pressure by proto- and metazoen grazers. The vertical distribution of non-motile particles and planktonic organisms comprises another important aspect of this study. Whereas motile planktonic organisms are able to regulate their position in the water column by active swimming non-motile particles will eventually sink out of the surface layer. Various processes affect the composition and magnitude of non-motile particles of biological origin of which grazing seemed to have played the major role during this study. |
author2 |
Smetacek, Victor Kirst, Gunter-Otto |
format |
Doctoral or Postdoctoral Thesis |
author |
Assmy, Philipp |
author_facet |
Assmy, Philipp |
author_sort |
Assmy, Philipp |
title |
Temporal development and vertical distribution of major components of the plankton assemblage during an iron fertilization experiment in the Antarctic Polar Frontal Zone |
title_short |
Temporal development and vertical distribution of major components of the plankton assemblage during an iron fertilization experiment in the Antarctic Polar Frontal Zone |
title_full |
Temporal development and vertical distribution of major components of the plankton assemblage during an iron fertilization experiment in the Antarctic Polar Frontal Zone |
title_fullStr |
Temporal development and vertical distribution of major components of the plankton assemblage during an iron fertilization experiment in the Antarctic Polar Frontal Zone |
title_full_unstemmed |
Temporal development and vertical distribution of major components of the plankton assemblage during an iron fertilization experiment in the Antarctic Polar Frontal Zone |
title_sort |
temporal development and vertical distribution of major components of the plankton assemblage during an iron fertilization experiment in the antarctic polar frontal zone |
publisher |
Universität Bremen |
publishDate |
2004 |
url |
https://media.suub.uni-bremen.de/handle/elib/2004 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000008994 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Antarktis* |
genre_facet |
Antarc* Antarctic Antarctica Antarktis* |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/2004 urn:nbn:de:gbv:46-diss000008994 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766168663804608512 |