Phytoplankton community structure in the VAHINE mesocosm experiment
The VAHINE mesocosm experiment was designed to trigger a diazotroph bloom and to follow the subsequent transfer of diazotroph-derived nitrogen (DDN) in the rest of the food web. Three mesocosms (50 m<sup>3</sup>) located inside the Nouméa lagoon (New Caledonia, southwestern Pacific) were...
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doaj-a106813bc45f4f0bad0a7d9a1c2ca6612020-11-25T02:30:42ZengCopernicus PublicationsBiogeosciences1726-41701726-41892016-09-0113185205521910.5194/bg-13-5205-2016Phytoplankton community structure in the VAHINE mesocosm experimentK. Leblanc0V. Cornet1M. Caffin2M. Rodier3A. Desnues4H. Berthelot5K. Turk-Kubo6J. Heliou7Aix Marseille Univ, CNRS/INSU, Univ Toulon, IRD, Mediterranean Institute of Oceanography UM110, 13288, Marseille, FranceAix Marseille Univ, CNRS/INSU, Univ Toulon, IRD, Mediterranean Institute of Oceanography UM110, 13288, Marseille, FranceAix Marseille Univ, CNRS/INSU, Univ Toulon, IRD, Mediterranean Institute of Oceanography UM110, 13288, Marseille, FranceMediterranean Institute of Oceanography, IRD/CNRS/Aix-Marseille Univ, IRD Nouméa, 101 Promenade R. Laroque, BPA5, 98848, Nouméa CEDEX, New CaledoniaMediterranean Institute of Oceanography, IRD/CNRS/Aix-Marseille Univ, IRD Nouméa, 101 Promenade R. Laroque, BPA5, 98848, Nouméa CEDEX, New CaledoniaAix Marseille Univ, CNRS/INSU, Univ Toulon, IRD, Mediterranean Institute of Oceanography UM110, 13288, Marseille, FranceOcean Sciences Department, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA, 95064, USAMediterranean Institute of Oceanography, IRD/CNRS/Aix-Marseille Univ, IRD Nouméa, 101 Promenade R. Laroque, BPA5, 98848, Nouméa CEDEX, New CaledoniaThe VAHINE mesocosm experiment was designed to trigger a diazotroph bloom and to follow the subsequent transfer of diazotroph-derived nitrogen (DDN) in the rest of the food web. Three mesocosms (50 m<sup>3</sup>) located inside the Nouméa lagoon (New Caledonia, southwestern Pacific) were enriched with dissolved inorganic phosphorus (DIP) in order to promote N<sub>2</sub> fixation in these low-nutrient, low-chlorophyll (LNLC) waters. Initially, the diazotrophic community was dominated by diatom diazotroph associations (DDAs), mainly by <i>Rhizosolenia/Richelia intracellularis</i>, and by <i>Trichodesmium</i>, which fueled enough DDN to sustain the growth of other diverse diatom species and <i>Synechococcus</i> populations that were well adapted to limiting DIP levels. After DIP fertilization (1 µM) on day 4, an initial lag time of 10 days was necessary for the mesocosm ecosystems to start building up biomass. However, changes in community structure were already observed during this first period, with a significant drop of both <i>Synechococcus</i> and diatom populations, while <i>Prochlorococcus</i> benefited from DIP addition. At the end of this first period, corresponding to when most added DIP was consumed, the diazotroph community changed drastically and became dominated by <i>Cyanothece</i>-like (UCYN-C) populations, which were accompanied by a monospecific bloom of the diatom <i>Cylindrotheca closterium</i>. During the second period, biomass increased sharply together with primary production and N<sub>2</sub>-fixation fluxes near tripled. Diatom populations, as well as <i>Synechococcus</i> and nanophytoeukaryotes, showed a re-increase towards the end of the experiment, showing efficient transfer of DDN to non-diazotrophic phytoplankton.http://www.biogeosciences.net/13/5205/2016/bg-13-5205-2016.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
K. Leblanc V. Cornet M. Caffin M. Rodier A. Desnues H. Berthelot K. Turk-Kubo J. Heliou |
spellingShingle |
K. Leblanc V. Cornet M. Caffin M. Rodier A. Desnues H. Berthelot K. Turk-Kubo J. Heliou Phytoplankton community structure in the VAHINE mesocosm experiment Biogeosciences |
author_facet |
K. Leblanc V. Cornet M. Caffin M. Rodier A. Desnues H. Berthelot K. Turk-Kubo J. Heliou |
author_sort |
K. Leblanc |
title |
Phytoplankton community structure in the VAHINE mesocosm experiment |
title_short |
Phytoplankton community structure in the VAHINE mesocosm experiment |
title_full |
Phytoplankton community structure in the VAHINE mesocosm experiment |
title_fullStr |
Phytoplankton community structure in the VAHINE mesocosm experiment |
title_full_unstemmed |
Phytoplankton community structure in the VAHINE mesocosm experiment |
title_sort |
phytoplankton community structure in the vahine mesocosm experiment |
publisher |
Copernicus Publications |
series |
Biogeosciences |
issn |
1726-4170 1726-4189 |
publishDate |
2016-09-01 |
description |
The VAHINE mesocosm experiment was designed to trigger a diazotroph bloom
and to follow the subsequent transfer of diazotroph-derived nitrogen (DDN)
in the rest of the food web. Three mesocosms (50 m<sup>3</sup>) located inside the
Nouméa lagoon (New Caledonia, southwestern Pacific) were enriched with
dissolved inorganic phosphorus (DIP) in order to promote N<sub>2</sub> fixation in
these low-nutrient, low-chlorophyll (LNLC) waters. Initially, the
diazotrophic community was dominated by diatom diazotroph associations
(DDAs), mainly by <i>Rhizosolenia/Richelia intracellularis</i>, and by <i>Trichodesmium</i>, which fueled enough DDN to sustain the growth of
other diverse diatom species and <i>Synechococcus</i> populations that were well adapted to
limiting DIP levels. After DIP fertilization (1 µM) on day 4, an
initial lag time of 10 days was necessary for the mesocosm ecosystems to
start building up biomass. However, changes in community structure were already
observed during this first period, with a significant drop of both
<i>Synechococcus</i> and diatom populations, while <i>Prochlorococcus</i> benefited from DIP addition. At the end of
this first period, corresponding to when most added DIP was consumed, the
diazotroph community changed drastically and became dominated by
<i>Cyanothece</i>-like (UCYN-C) populations, which were accompanied by a monospecific bloom
of the diatom <i>Cylindrotheca closterium</i>. During the second period, biomass increased sharply together
with primary production and N<sub>2</sub>-fixation fluxes near tripled. Diatom
populations, as well as <i>Synechococcus</i> and nanophytoeukaryotes, showed a re-increase
towards the end of the experiment, showing efficient transfer of DDN to non-diazotrophic phytoplankton. |
url |
http://www.biogeosciences.net/13/5205/2016/bg-13-5205-2016.pdf |
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