Effect of in situ iron fertilisation during contrasting seasons comparison between EisenEx and EIFEX
Iron fertilisation experiments offer a unique tool to investigate biological systems in situ and the scope of reaction by manipulating one parameter. During two in situ iron fertilisation experiments, carried out in contrasting seasons (EisenEx early austral spring 2000 and EIFEX late austral summer...
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ftawi:oai:epic.awi.de:13801 2023-09-05T13:23:31+02:00 Effect of in situ iron fertilisation during contrasting seasons comparison between EisenEx and EIFEX Peeken, Ilka Hoffmann, L. Assmy, Philipp Bathmann, Ulrich Croot, P. von Harbou, L. Henjes, Joachim Jansen, Sandra Krägefsky, Sören Lochte, Karin Sachs, Oliver Sauter, Eberhard 2006 https://epic.awi.de/id/eprint/13801/ https://hdl.handle.net/10013/epic.24169 unknown Peeken, I. orcid:0000-0003-1531-1664 , Hoffmann, L. , Assmy, P. , Bathmann, U. , Croot, P. , von Harbou, L. , Henjes, J. orcid:0000-0002-6688-8802 , Jansen, S. , Krägefsky, S. , Lochte, K. , Sachs, O. and Sauter, E. orcid:0000-0001-7954-952X (2006) Effect of in situ iron fertilisation during contrasting seasons comparison between EisenEx and EIFEX , Ocean Sciences Meeting, 20-24 February 2006, Honolulu, Hawaii. . hdl:10013/epic.24169 EPIC3Ocean Sciences Meeting, 20-24 February 2006, Honolulu, Hawaii. Conference notRev 2006 ftawi 2023-08-22T19:50:49Z Iron fertilisation experiments offer a unique tool to investigate biological systems in situ and the scope of reaction by manipulating one parameter. During two in situ iron fertilisation experiments, carried out in contrasting seasons (EisenEx early austral spring 2000 and EIFEX late austral summer to early fall 2004) in the Atlantic sector of the Southern Ocean, no clear seasonal impact on the phytoplankton built up and main group distribution could be observed. In both experiments chlorophyll biomass increased threefold and maximum concentrations were around 3 \mug/l. Diatoms, identified by marker pigment were the main beneficiary of the iron fertilisation; however, microscopic observations showed a different diatom species succession in both experiments. Small differences were observed in the other phytoplankton groups including phototrophic dinoflagellates, pelagophytes, cryptophytes and chlorophytes. These groups increased in the spring EisenEx experiment immediately after iron fertilisation, while in the fall EIFEX experiment most other phytoplankton, except for phototrophic dinoflagellates, constantly decreased during the experiment.A significant difference between experiments was observed in the phaeopigment concentration which was threefold higher during EIFEX than in EisenEx, suggesting a large role for zooplankton in the fate of the phytoplankton bloom. Additionally during EIFEX, a strong shift of chlorophyll degradation products indicated a change in the zooplankton community over the course of the experiment. Another pronounced difference between the two fertilisations was the high phytoplankton biomass below 100 m towards the end of EIFEX. The diatom marker fucoxanthin and chlorophyll a could be followed in the water column to a depth of 4000 m and a low ratio of phaeopigments to chl a indicated that the export of fresh material most likely originated from the iron fertilised patch. This was corroborated by a similar diatom composition at both the surface and deep water column, as well as in fluff ... Conference Object Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Austral Southern Ocean |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
Iron fertilisation experiments offer a unique tool to investigate biological systems in situ and the scope of reaction by manipulating one parameter. During two in situ iron fertilisation experiments, carried out in contrasting seasons (EisenEx early austral spring 2000 and EIFEX late austral summer to early fall 2004) in the Atlantic sector of the Southern Ocean, no clear seasonal impact on the phytoplankton built up and main group distribution could be observed. In both experiments chlorophyll biomass increased threefold and maximum concentrations were around 3 \mug/l. Diatoms, identified by marker pigment were the main beneficiary of the iron fertilisation; however, microscopic observations showed a different diatom species succession in both experiments. Small differences were observed in the other phytoplankton groups including phototrophic dinoflagellates, pelagophytes, cryptophytes and chlorophytes. These groups increased in the spring EisenEx experiment immediately after iron fertilisation, while in the fall EIFEX experiment most other phytoplankton, except for phototrophic dinoflagellates, constantly decreased during the experiment.A significant difference between experiments was observed in the phaeopigment concentration which was threefold higher during EIFEX than in EisenEx, suggesting a large role for zooplankton in the fate of the phytoplankton bloom. Additionally during EIFEX, a strong shift of chlorophyll degradation products indicated a change in the zooplankton community over the course of the experiment. Another pronounced difference between the two fertilisations was the high phytoplankton biomass below 100 m towards the end of EIFEX. The diatom marker fucoxanthin and chlorophyll a could be followed in the water column to a depth of 4000 m and a low ratio of phaeopigments to chl a indicated that the export of fresh material most likely originated from the iron fertilised patch. This was corroborated by a similar diatom composition at both the surface and deep water column, as well as in fluff ... |
format |
Conference Object |
author |
Peeken, Ilka Hoffmann, L. Assmy, Philipp Bathmann, Ulrich Croot, P. von Harbou, L. Henjes, Joachim Jansen, Sandra Krägefsky, Sören Lochte, Karin Sachs, Oliver Sauter, Eberhard |
spellingShingle |
Peeken, Ilka Hoffmann, L. Assmy, Philipp Bathmann, Ulrich Croot, P. von Harbou, L. Henjes, Joachim Jansen, Sandra Krägefsky, Sören Lochte, Karin Sachs, Oliver Sauter, Eberhard Effect of in situ iron fertilisation during contrasting seasons comparison between EisenEx and EIFEX |
author_facet |
Peeken, Ilka Hoffmann, L. Assmy, Philipp Bathmann, Ulrich Croot, P. von Harbou, L. Henjes, Joachim Jansen, Sandra Krägefsky, Sören Lochte, Karin Sachs, Oliver Sauter, Eberhard |
author_sort |
Peeken, Ilka |
title |
Effect of in situ iron fertilisation during contrasting seasons comparison between EisenEx and EIFEX |
title_short |
Effect of in situ iron fertilisation during contrasting seasons comparison between EisenEx and EIFEX |
title_full |
Effect of in situ iron fertilisation during contrasting seasons comparison between EisenEx and EIFEX |
title_fullStr |
Effect of in situ iron fertilisation during contrasting seasons comparison between EisenEx and EIFEX |
title_full_unstemmed |
Effect of in situ iron fertilisation during contrasting seasons comparison between EisenEx and EIFEX |
title_sort |
effect of in situ iron fertilisation during contrasting seasons comparison between eisenex and eifex |
publishDate |
2006 |
url |
https://epic.awi.de/id/eprint/13801/ https://hdl.handle.net/10013/epic.24169 |
geographic |
Austral Southern Ocean |
geographic_facet |
Austral Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
EPIC3Ocean Sciences Meeting, 20-24 February 2006, Honolulu, Hawaii. |
op_relation |
Peeken, I. orcid:0000-0003-1531-1664 , Hoffmann, L. , Assmy, P. , Bathmann, U. , Croot, P. , von Harbou, L. , Henjes, J. orcid:0000-0002-6688-8802 , Jansen, S. , Krägefsky, S. , Lochte, K. , Sachs, O. and Sauter, E. orcid:0000-0001-7954-952X (2006) Effect of in situ iron fertilisation during contrasting seasons comparison between EisenEx and EIFEX , Ocean Sciences Meeting, 20-24 February 2006, Honolulu, Hawaii. . hdl:10013/epic.24169 |
_version_ |
1776204112235331584 |