SPECIES-SPECIFIC GROWTH PERFORMANCE AND GRAZING MORTALITY OF THE DIATOM ASSEMBLAGE DURING AN IN SITU IRON-INDUCED BLOOM IN THE SOUTHERN OCEAN (EISENEX)
Phytoplankton blooms play a major role in global elemental cycles and marine food chains but different species impact these in different ways. Hence a mechanistic understanding of the factors regulating species dominance is a prerequisite to predictive modelling. Results from EisenEx revealed 6 dist...
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ftawi:oai:epic.awi.de:13505 2023-09-05T13:23:30+02:00 SPECIES-SPECIFIC GROWTH PERFORMANCE AND GRAZING MORTALITY OF THE DIATOM ASSEMBLAGE DURING AN IN SITU IRON-INDUCED BLOOM IN THE SOUTHERN OCEAN (EISENEX) Assmy, Philipp Henjes, Joachim Klaas, Christine Smetacek, Victor 2005 application/pdf https://epic.awi.de/id/eprint/13505/ https://epic.awi.de/id/eprint/13505/1/Ass2005b.pdf https://hdl.handle.net/10013/epic.23887 https://hdl.handle.net/10013/epic.23887.d001 unknown https://epic.awi.de/id/eprint/13505/1/Ass2005b.pdf https://hdl.handle.net/10013/epic.23887.d001 Assmy, P. , Henjes, J. orcid:0000-0002-6688-8802 , Klaas, C. orcid:0000-0002-6679-8970 and Smetacek, V. (2005) SPECIES-SPECIFIC GROWTH PERFORMANCE AND GRAZING MORTALITY OF THE DIATOM ASSEMBLAGE DURING AN IN SITU IRON-INDUCED BLOOM IN THE SOUTHERN OCEAN (EISENEX) , ASLO Summer Meeting 2005, Special Session 11: Biodiversity, biogeochemistry and trophic interactions: The braid of pelagic microbial ecology. 19.-24. June, Santiago de Compostela, Spain. . hdl:10013/epic.23887 EPIC3ASLO Summer Meeting 2005, Special Session 11: Biodiversity, biogeochemistry and trophic interactions: The braid of pelagic microbial ecology. 19.-24. June, Santiago de Compostela, Spain. Conference notRev 2005 ftawi 2023-08-22T19:50:38Z Phytoplankton blooms play a major role in global elemental cycles and marine food chains but different species impact these in different ways. Hence a mechanistic understanding of the factors regulating species dominance is a prerequisite to predictive modelling. Results from EisenEx revealed 6 distinct response behaviours to iron fertilization. Five species of the over 50 recorded, contributed 48% of total diatom biomass. Of these, two species (a pennate and a centric) reacted immediately with accumulation rates about double those of other species and built up population size exponentially. In contrast species with initially highest abundances responded after a week with a brief period of rapid accumulation which levelled off later. The ratio of live cells to intact empty and broken frustules (LC:EBF), used as a measure of mortality, increased steadily inside the fertilized patch indicating that the grazer assemblage could not keep pace with growth of the dominant species. Species-specific differences in the LC:EBF ratio and the ratio of intact empty to broken frustules indicated that selective grazing by proto- and metazooplankton played an important role in structuring the diatom assemblage. Conference Object Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) 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 |
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description |
Phytoplankton blooms play a major role in global elemental cycles and marine food chains but different species impact these in different ways. Hence a mechanistic understanding of the factors regulating species dominance is a prerequisite to predictive modelling. Results from EisenEx revealed 6 distinct response behaviours to iron fertilization. Five species of the over 50 recorded, contributed 48% of total diatom biomass. Of these, two species (a pennate and a centric) reacted immediately with accumulation rates about double those of other species and built up population size exponentially. In contrast species with initially highest abundances responded after a week with a brief period of rapid accumulation which levelled off later. The ratio of live cells to intact empty and broken frustules (LC:EBF), used as a measure of mortality, increased steadily inside the fertilized patch indicating that the grazer assemblage could not keep pace with growth of the dominant species. Species-specific differences in the LC:EBF ratio and the ratio of intact empty to broken frustules indicated that selective grazing by proto- and metazooplankton played an important role in structuring the diatom assemblage. |
format |
Conference Object |
author |
Assmy, Philipp Henjes, Joachim Klaas, Christine Smetacek, Victor |
spellingShingle |
Assmy, Philipp Henjes, Joachim Klaas, Christine Smetacek, Victor SPECIES-SPECIFIC GROWTH PERFORMANCE AND GRAZING MORTALITY OF THE DIATOM ASSEMBLAGE DURING AN IN SITU IRON-INDUCED BLOOM IN THE SOUTHERN OCEAN (EISENEX) |
author_facet |
Assmy, Philipp Henjes, Joachim Klaas, Christine Smetacek, Victor |
author_sort |
Assmy, Philipp |
title |
SPECIES-SPECIFIC GROWTH PERFORMANCE AND GRAZING MORTALITY OF THE DIATOM ASSEMBLAGE DURING AN IN SITU IRON-INDUCED BLOOM IN THE SOUTHERN OCEAN (EISENEX) |
title_short |
SPECIES-SPECIFIC GROWTH PERFORMANCE AND GRAZING MORTALITY OF THE DIATOM ASSEMBLAGE DURING AN IN SITU IRON-INDUCED BLOOM IN THE SOUTHERN OCEAN (EISENEX) |
title_full |
SPECIES-SPECIFIC GROWTH PERFORMANCE AND GRAZING MORTALITY OF THE DIATOM ASSEMBLAGE DURING AN IN SITU IRON-INDUCED BLOOM IN THE SOUTHERN OCEAN (EISENEX) |
title_fullStr |
SPECIES-SPECIFIC GROWTH PERFORMANCE AND GRAZING MORTALITY OF THE DIATOM ASSEMBLAGE DURING AN IN SITU IRON-INDUCED BLOOM IN THE SOUTHERN OCEAN (EISENEX) |
title_full_unstemmed |
SPECIES-SPECIFIC GROWTH PERFORMANCE AND GRAZING MORTALITY OF THE DIATOM ASSEMBLAGE DURING AN IN SITU IRON-INDUCED BLOOM IN THE SOUTHERN OCEAN (EISENEX) |
title_sort |
species-specific growth performance and grazing mortality of the diatom assemblage during an in situ iron-induced bloom in the southern ocean (eisenex) |
publishDate |
2005 |
url |
https://epic.awi.de/id/eprint/13505/ https://epic.awi.de/id/eprint/13505/1/Ass2005b.pdf https://hdl.handle.net/10013/epic.23887 https://hdl.handle.net/10013/epic.23887.d001 |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Southern Ocean |
genre_facet |
Southern Ocean |
op_source |
EPIC3ASLO Summer Meeting 2005, Special Session 11: Biodiversity, biogeochemistry and trophic interactions: The braid of pelagic microbial ecology. 19.-24. June, Santiago de Compostela, Spain. |
op_relation |
https://epic.awi.de/id/eprint/13505/1/Ass2005b.pdf https://hdl.handle.net/10013/epic.23887.d001 Assmy, P. , Henjes, J. orcid:0000-0002-6688-8802 , Klaas, C. orcid:0000-0002-6679-8970 and Smetacek, V. (2005) SPECIES-SPECIFIC GROWTH PERFORMANCE AND GRAZING MORTALITY OF THE DIATOM ASSEMBLAGE DURING AN IN SITU IRON-INDUCED BLOOM IN THE SOUTHERN OCEAN (EISENEX) , ASLO Summer Meeting 2005, Special Session 11: Biodiversity, biogeochemistry and trophic interactions: The braid of pelagic microbial ecology. 19.-24. June, Santiago de Compostela, Spain. . hdl:10013/epic.23887 |
_version_ |
1776204090541342720 |