Relevant bibliographies by topics / Diatom-diazotroph associations

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Academic literature on the topic 'Diatom-diazotroph associations'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Diatom-diazotroph associations"

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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "Diatom-diazotroph associations"

1

Pyle, Amy Elizabeth. "Light dependant growth and nitrogen fixation rates in the Hemiaulus haukii and Hemiaulus membranaceus diatom-diazotroph associations." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4629.

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Nitrogen-fixation is an essential biochemical reaction involving the reduction of inert, atmospheric dinitrogen (N2) into biochemically accessible ammonia (NH3). Organisms that are capable of this process are collectively called “diazotrophs” and are ubiquitous in marine and terrestrial environments. Despite the wide distribution, little is known about the biological nature of the diverse groups of diazotrophs. This study was designed to address the influence of light and nutrients on nitrogen fixation and growth in several marine diazotrophic symbioses collectively termed “Diatom-Diazotroph A
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Knapke, Ellen Marie. "Influence of the Mississippi River plume on diazotroph distributions in the northern Gulf of Mexico during summer 2011." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-08-6107.

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In the subtropical oligotrophic ocean, nitrogen fixation is an important source of new nitrogen (N) for supporting biological production. Previous studies have found that nitrogen-fixing Diatom-Diazotroph Associations (DDAs) are in high abundance in the intermediate salinity zone of large river plumes such as the Amazon and Mekong rivers, while Trichodesmium spp. becomes more abundant at higher salinities. This recurring pattern in the Amazon River plume suggests that strong salinity and nutrient gradients within the river plumes may lead to a cascade in diazotroph communities. I hypothesized
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3

Brown, Colbi Gabrielle 1984. "A multi-year study of summer diatom blooms in the North Pacific Subtropical Gyre." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1757.

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In the North Pacific Subtropical Gyre, a nearly-annual phytoplankton bloom forms near the subtropical front at ~30° N. Mixed communities of nitrogen-fixing diatom symbioses (diatom-diazotroph associations) increase 10²-10³ fold in these blooms. In July 2008 (31.46˚N 140.49˚W) and August 2009 (25.18 °N 154 °W), two blooms were sampled to determine diatom-diazotroph association species composition, physical, and chemical characteristics of the water column. In both 2008 and 2009, the dominant diatom-diazotroph association was the Hemiaulus hauckii-Richelia intracellularis symbiosis. The 2009 sub
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