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Journal articles on the topic 'Diatom-diazotroph associations'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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1

Leblanc, Karine, Véronique Cornet, Mathieu Caffin, et al. "Phytoplankton community structure in the VAHINE mesocosm experiment." Biogeosciences 13, no. 18 (2016): 5205–19. http://dx.doi.org/10.5194/bg-13-5205-2016.

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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 fuel

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2

Follett, Christopher L., Stephanie Dutkiewicz, David M. Karl, Keisuke Inomura, and Michael J. Follows. "Seasonal resource conditions favor a summertime increase in North Pacific diatom–diazotroph associations." ISME Journal 12, no. 6 (2018): 1543–57. http://dx.doi.org/10.1038/s41396-017-0012-x.

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3

Tuo, Sh, YLL Chen, and HY Chen. "Low nitrate availability promotes diatom diazotroph associations in the marginal seas of the western Pacific." Aquatic Microbial Ecology 73, no. 2 (2014): 135–50. http://dx.doi.org/10.3354/ame01715.

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4

Kashulin, Nikolay, Tatiana Kashulina, and Alexander Bekkelund. "Long-Term Eutrophication and Dynamics of Bloom-Forming Microbial Communities during Summer HAB in Large Arctic Lake." Environments 8, no. 8 (2021): 82. http://dx.doi.org/10.3390/environments8080082.

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Harmful algal blooms (HABs) in arctic lakes are recent phenomena. In our study, we performed a long-term analysis (1990–2017) of the eutrophication of Lake Imandra, a large subarctic lake, and explored the biodiversity of bloom-forming microorganisms of a 2017 summer HAB. We performed a 16Sr rRNA metabarcoding study of microbial communities, analysed the associations between N, P, C, and chlorophyll concentrations in the lake water, and developed models for the prediction of HABs based on total P concentration. We have demonstrated that blooms in Lake Imandra occur outside of optimal Redfield

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5

Spungin, Dina, Natalia Belkin, Rachel A. Foster, et al. "Programmed cell death in diazotrophs and the fate of organic matter in the western tropical South Pacific Ocean during the OUTPACE cruise." Biogeosciences 15, no. 12 (2018): 3893–908. http://dx.doi.org/10.5194/bg-15-3893-2018.

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Abstract. The fate of diazotroph (N2 fixers) derived carbon (C) and nitrogen (N) and their contribution to vertical export of C and N in the western tropical South Pacific Ocean was studied during OUTPACE (Oligotrophy to UlTra-oligotrophy PACific Experiment). Our specific objective during OUTPACE was to determine whether autocatalytic programmed cell death (PCD), occurring in some diazotrophs, is an important mechanism affecting diazotroph mortality and a factor regulating the vertical flux of organic matter and, thus, the fate of the blooms. We sampled at three long duration (LD) stations of

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6

Inomura, Keisuke, Christopher L. Follett, Takako Masuda, Meri Eichner, Ondřej Prášil, and Curtis Deutsch. "Carbon Transfer from the Host Diatom Enables Fast Growth and High Rate of N2 Fixation by Symbiotic Heterocystous Cyanobacteria." Plants 9, no. 2 (2020): 192. http://dx.doi.org/10.3390/plants9020192.

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Diatom–diazotroph associations (DDAs) are symbioses where trichome-forming cyanobacteria support the host diatom with fixed nitrogen through dinitrogen (N2) fixation. It is inferred that the growth of the trichomes is also supported by the host, but the support mechanism has not been fully quantified. Here, we develop a coarse-grained, cellular model of the symbiosis between Hemiaulus and Richelia (one of the major DDAs), which shows that carbon (C) transfer from the diatom enables a faster growth and N2 fixation rate by the trichomes. The model predicts that the rate of N2 fixation is 5.5 tim

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7

Bonnet, Sophie, Melika Baklouti, Audrey Gimenez, Hugo Berthelot, and Ilana Berman-Frank. "Biogeochemical and biological impacts of diazotroph blooms in a low-nutrient, low-chlorophyll ecosystem: synthesis from the VAHINE mesocosm experiment (New Caledonia)." Biogeosciences 13, no. 15 (2016): 4461–79. http://dx.doi.org/10.5194/bg-13-4461-2016.

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Abstract. In marine ecosystems, biological N2 fixation provides the predominant external source of nitrogen (N; 140 ± 50 Tg N yr−1), contributing more than atmospheric and riverine inputs to the N supply. Yet the fate and magnitude of the newly fixed N, or diazotroph-derived N (hereafter named DDN) in marine ecosystems is poorly understood. Moreover, whether the DDN is preferentially and directly exported out of the photic zone, recycled by the microbial loop and/or transferred into larger organisms remains unclear. These questions were investigated in the framework of the VAHINE (VAriability

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8

Bale, Nicole J., Tracy A. Villareal, Ellen C. Hopmans, et al. "C<sub>5</sub> glycolipids of heterocystous cyanobacteria track symbiont abundance in the diatom <i>Hemiaulus hauckii</i> across the tropical North Atlantic." Biogeosciences 15, no. 4 (2018): 1229–41. http://dx.doi.org/10.5194/bg-15-1229-2018.

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Abstract. Diatom–diazotroph associations (DDAs) include marine heterocystous cyanobacteria found as exosymbionts and endosymbionts in multiple diatom species. Heterocysts are the site of N2 fixation and have thickened cell walls containing unique heterocyst glycolipids which maintain a low oxygen environment within the heterocyst. The endosymbiotic cyanobacterium Richelia intracellularis found in species of the diatom genus Hemiaulus and Rhizosolenia makes heterocyst glycolipids (HGs) which are composed of C30 and C32 diols and triols with pentose (C5) moieties that are distinct from limnetic

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9

Stenegren, Marcus, Andrea Caputo, Carlo Berg, Sophie Bonnet, and Rachel A. Foster. "Distribution and drivers of symbiotic and free-living diazotrophic cyanobacteria in the western tropical South Pacific." Biogeosciences 15, no. 5 (2018): 1559–78. http://dx.doi.org/10.5194/bg-15-1559-2018.

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Abstract. The abundance and distribution of cyanobacterial diazotrophs were quantified in two regions (Melanesian archipelago, MA; and subtropical gyre, SG) of the western tropical South Pacific using nifH quantitative polymerase chain reaction (qPCR) assays. UCYN-A1 and A2 host populations were quantified using 18S rRNA qPCR assays including one newly developed assay. All phylotypes were detected in the upper photic zone (0–50 m), with higher abundances in the MA region. Trichodesmium and UCYN-B dominated and ranged from 2.18 × 102 to 9.41 × 106 and 1.10 × 102 to 2.78 × 106 nifH copies L−1, r

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10

Anderson, Emily E., Cara Wilson, Anthony H. Knap, and Tracy A. Villareal. "Summer diatom blooms in the eastern North Pacific gyre investigated with a long-endurance autonomous surface vehicle." PeerJ 6 (August 15, 2018): e5387. http://dx.doi.org/10.7717/peerj.5387.

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Satellite chlorophyll a (chl a) observations have repeatedly noted summertime phytoplankton blooms in the North Pacific subtropical gyre (NPSG), a region of open ocean that is far removed from any land-derived or Ekman upwelling nutrient sources. These blooms are dominated by N2-fixing diatom-cyanobacteria associations of the diatom genera Rhizosolenia Brightwell and Hemiaulus Ehrenberg. Their nitrogen fixing endosymbiont, Richelia intracellularis J.A. Schmidt, is hypothesized to be critical to the development of blooms in this nitrogen limited region. However, due to the remote location and u

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11

Bale, Nicole J., Rick Hennekam, Ellen C. Hopmans, et al. "Biomarker evidence for nitrogen-fixing cyanobacterial blooms in a brackish surface layer in the Nile River plume during sapropel deposition." Geology 47, no. 11 (2019): 1088–92. http://dx.doi.org/10.1130/g46682.1.

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Abstract Sapropels are organic-rich sediment layers deposited in the eastern Mediterranean Sea during precession minima, resulting from an increase in export productivity and/or preservation. Increased freshwater delivery from the African continent resulted in stratification, causing deepwater anoxia, while nutrient input stimulated productivity, presumably at the deep chlorophyll maximum. Previous studies have suggested that during sapropel deposition, nitrogen fixation was widespread in the highly stratified surface waters, and that cyanobacteria symbiotic with diatoms (diatom-diazotroph ass

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12

Berthelot, H., T. Moutin, S. L'Helguen, et al. "Dinitrogen fixation and dissolved organic nitrogen fueled primary production and particulate export during the VAHINE mesocosm experiment (New Caledonia lagoon)." Biogeosciences 12, no. 13 (2015): 4099–112. http://dx.doi.org/10.5194/bg-12-4099-2015.

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Abstract. In the oligotrophic ocean characterized by nitrate (NO3−) depletion in surface waters, dinitrogen (N2) fixation and dissolved organic nitrogen (DON) can represent significant nitrogen (N) sources for the ecosystem. In this study, we deployed large in situ mesocosms in New Caledonia in order to investigate (1) the contribution of N2 fixation and DON use to primary production (PP) and particle export and (2) the fate of the freshly produced particulate organic N (PON), i.e., whether it is preferentially accumulated and recycled in the water column or exported out of the system. The mes

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13

Hunt, Brian P. V., Sophie Bonnet, Hugo Berthelot, Brandon J. Conroy, Rachel A. Foster, and Marc Pagano. "Contribution and pathways of diazotroph-derived nitrogen to zooplankton during the VAHINE mesocosm experiment in the oligotrophic New Caledonia lagoon." Biogeosciences 13, no. 10 (2016): 3131–45. http://dx.doi.org/10.5194/bg-13-3131-2016.

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Abstract. In oligotrophic tropical and subtropical oceans, where strong stratification can limit the replenishment of surface nitrate, dinitrogen (N2) fixation by diazotrophs can represent a significant source of nitrogen (N) for primary production. The VAHINE (VAriability of vertical and tropHIc transfer of fixed N2 in the south-wEst Pacific) experiment was designed to examine the fate of diazotroph-derived nitrogen (DDN) in such ecosystems. In austral summer 2013, three large ( ∼ 50 m3) in situ mesocosms were deployed for 23 days in the New Caledonia lagoon, an ecosystem that typifies the lo

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14

Berman-Frank, Ilana, Dina Spungin, Eyal Rahav, France Van Wambeke, Kendra Turk-Kubo, and Thierry Moutin. "Dynamics of transparent exopolymer particles (TEP) during the VAHINE mesocosm experiment in the New Caledonian lagoon." Biogeosciences 13, no. 12 (2016): 3793–805. http://dx.doi.org/10.5194/bg-13-3793-2016.

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Abstract. In the marine environment, transparent exopolymeric particles (TEP) produced from abiotic and biotic sources link the particulate and dissolved carbon pools and are essential vectors enhancing vertical carbon flux. We characterized spatial and temporal dynamics of TEP during the VAHINE experiment that investigated the fate of diazotroph-derived nitrogen and carbon in three replicate dissolved inorganic phosphorus (DIP)-fertilized 50 m3 enclosures in the oligotrophic New Caledonian lagoon. During the 23 days of the experiment, we did not observe any depth-dependent changes in TEP conc

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15

Pfreundt, Ulrike, Dina Spungin, Sophie Bonnet, Ilana Berman-Frank, and Wolfgang R. Hess. "Global analysis of gene expression dynamics within the marine microbial community during the VAHINE mesocosm experiment in the southwest Pacific." Biogeosciences 13, no. 14 (2016): 4135–49. http://dx.doi.org/10.5194/bg-13-4135-2016.

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Abstract. Microbial gene expression was followed for 23 days within a mesocosm (M1) isolating 50 m3 of seawater and in the surrounding waters in the Nouméa lagoon, New Caledonia, in the southwest Pacific as part of the VAriability of vertical and tropHIc transfer of diazotroph derived N in the south wEst Pacific (VAHINE) experiment. The aim of VAHINE was to examine the fate of diazotroph-derived nitrogen (DDN) in a low-nutrient, low-chlorophyll ecosystem. On day 4 of the experiment, the mesocosm was fertilized with phosphate. In the lagoon, gene expression was dominated by the cyanobacterium S

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16

Yeung, Laurence Y., William M. Berelson, Edward D. Young, et al. "Impact of diatom-diazotroph associations on carbon export in the Amazon River plume." Geophysical Research Letters 39, no. 18 (2012). http://dx.doi.org/10.1029/2012gl053356.

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17

Caputo, A., J. A. A. Nylander, and R. A. Foster. "The genetic diversity and evolution of diatom-diazotroph associations highlights traits favoring symbiont integration." FEMS Microbiology Letters 366, no. 2 (2019). http://dx.doi.org/10.1093/femsle/fny297.

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18

"Corrigendum to: The genetic diversity and evolution of diatom-diazotroph associations highlights traits favoring symbiont integration." FEMS Microbiology Letters 366, no. 10 (2019). http://dx.doi.org/10.1093/femsle/fnz120.

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19

Stenegren, Marcus, Carlo Berg, Cory C. Padilla, et al. "Piecewise Structural Equation Model (SEM) Disentangles the Environmental Conditions Favoring Diatom Diazotroph Associations (DDAs) in the Western Tropical North Atlantic (WTNA)." Frontiers in Microbiology 8 (May 9, 2017). http://dx.doi.org/10.3389/fmicb.2017.00810.

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