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Phytoplankton community structure in the VAHINE mesocosm experiment
- Source :
- Biogeosciences, Biogeosciences, European Geosciences Union, 2016, 13 (18), pp.5205-5219. 〈10.5194/bg-13-5205-2016〉, Biogeosciences, European Geosciences Union, 2016, 13 (18), pp.5205-5219. ⟨10.5194/bg-13-5205-2016⟩, Biogeosciences, 2016, 13 (18), pp.5205-5219. ⟨10.5194/bg-13-5205-2016⟩, Biogeosciences, Vol 13, Iss 18, Pp 5205-5219 (2016)
- Publication Year :
- 2018
-
Abstract
- 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 m3) located inside the Nouméa lagoon (New Caledonia, southwestern Pacific) were enriched with dissolved inorganic phosphorus (DIP) in order to promote N2 fixation in these low-nutrient, low-chlorophyll (LNLC) waters. Initially, the diazotrophic community was dominated by diatom diazotroph associations (DDAs), mainly by Rhizosolenia/Richelia intracellularis, and by Trichodesmium, which fueled enough DDN to sustain the growth of other diverse diatom species and Synechococcus 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 Synechococcus and diatom populations, while Prochlorococcus 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 Cyanothece-like (UCYN-C) populations, which were accompanied by a monospecific bloom of the diatom Cylindrotheca closterium. During the second period, biomass increased sharply together with primary production and N2-fixation fluxes near tripled. Diatom populations, as well as Synechococcus and nanophytoeukaryotes, showed a re-increase towards the end of the experiment, showing efficient transfer of DDN to non-diazotrophic phytoplankton.
- Subjects :
- 0106 biological sciences
010504 meteorology & atmospheric sciences
lcsh:Life
[SDV.BID.SPT]Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy
01 natural sciences
Mesocosm
[ SDV.MP ] Life Sciences [q-bio]/Microbiology and Parasitology
lcsh:QH540-549.5
Phytoplankton
14. Life underwater
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
Ecology, Evolution, Behavior and Systematics
0105 earth and related environmental sciences
Earth-Surface Processes
[ SDU.STU.OC ] Sciences of the Universe [physics]/Earth Sciences/Oceanography
biology
Ecology
010604 marine biology & hydrobiology
lcsh:QE1-996.5
biology.organism_classification
Synechococcus
lcsh:Geology
lcsh:QH501-531
[SDV.MP]Life Sciences [q-bio]/Microbiology and Parasitology
Oceanography
Diatom
Trichodesmium
lcsh:Ecology
Prochlorococcus
Diazotroph
Bloom
[ SDV.BID.SPT ] Life Sciences [q-bio]/Biodiversity/Systematics, Phylogenetics and taxonomy
Subjects
Details
- Language :
- English
- ISSN :
- 17264189 and 17264170
- Database :
- OpenAIRE
- Journal :
- Biogeosciences, Biogeosciences, European Geosciences Union, 2016, 13 (18), pp.5205-5219. 〈10.5194/bg-13-5205-2016〉, Biogeosciences, European Geosciences Union, 2016, 13 (18), pp.5205-5219. ⟨10.5194/bg-13-5205-2016⟩, Biogeosciences, 2016, 13 (18), pp.5205-5219. ⟨10.5194/bg-13-5205-2016⟩, Biogeosciences, Vol 13, Iss 18, Pp 5205-5219 (2016)
- Accession number :
- edsair.doi.dedup.....94b9ee1b327ced8769e577b6021c01c3