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  • 1
    Electronic Resource
    Electronic Resource
    High rates of N 2 fixation by unicellular diazotrophs in the oligotrophic Pacific Ocean (2004)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 430 (2004), S. 1027-1032 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The availability of nitrogen is important in regulating biological productivity in marine environments. Deepwater nitrate has long been considered the major source of new nitrogen supporting primary production in oligotrophic regions of the open ocean, but recent studies have showed that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02824
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Nitrogen transport by vertically migrating diatom mats in the North Pacific Ocean (1993)
    [s.l.] : Nature Publishing Group
    Nature 363 (1993), S. 709-712 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Rhizosolenia mats are buoyant, macroscopic (1-30 cm wide) diatom associations of multiple Rhizosolenia species occurring over broad expanses of the North Atlantic, North Pacific and Indian oceans4"6. Mats are sporadic and occur at 103 m3or less in the North Atlantic5; no estimates are ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/363709a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Upward transport of oceanic nitrate by migrating diatom mats (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 397 (1999), S. 423-425 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The oligotrophic gyres of the open sea are home to a flora that includes the largest known phytoplankton. These rare species migrate as solitary cells or aggregations (mats) between deep nutrient pools (below 80–100 m) and the surface. This migration contributes to new production ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/17103
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  • 4
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    (Table S2) Diazotroph enumeration data across the tropical North Atlantic (2018)
    PANGAEA
    Details
    Publication Date: 2023-03-25
    Keywords: 64PE393; 64PE393_10CTD; 64PE393_11CTD; 64PE393_12CTD; 64PE393_13CTD; 64PE393_14CTD; 64PE393_15CTD; 64PE393_16CTD; 64PE393_17CTD; 64PE393_18CTD; 64PE393_19CTD; 64PE393_1CTD; 64PE393_20CTD; 64PE393_21CTD; 64PE393_22CTD; 64PE393_23CTD; 64PE393_2CTD; 64PE393_3CTD; 64PE393_4CTD; 64PE393_5CTD; 64PE393_6CTD; 64PE393_7CTD; 64PE393_8CTD; 64PE393_9CTD; CTD/Rosette; CTD-RO; DATE/TIME; DEPTH, water; Event label; HCC; Hemiaulus hauckii; Latitude of event; Longitude of event; NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University; Pelagia; Rhizosolenia; Rhizosolenia clevei; Trichodesmium; Tropical North Atlantic
    Type: Dataset
    Format: text/tab-separated-values, 705 data points
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  • 5
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    Global distributions of diazotrophs abundance, biomass and nitrogen fixation rates - Gridded data product (NetCDF) - Contribution to the MAREDAT World Ocean Atlas of Plankton Functional Types (2012)
    PANGAEA
    In:  Supplement to: Luo, Yawei; Doney, Scott C; Anderson, L A; Benavides, Mar; Berman-Frank, I; Bode, Antonio; Bonnet, S; Boström, Kjärstin H; Böttjer, D; Capone, D G; Carpenter, E J; Chen, Yaw-Lin; Church, Matthew J; Dore, John E; Falcón, Luisa I; Fernández, A; Foster, R A; Furuya, Ken; Gomez, Fernando; Gundersen, Kjell; Hynes, Annette M; Karl, David Michael; Kitajima, Satoshi; Langlois, Rebecca; LaRoche, Julie; Letelier, Ricardo M; Marañón, Emilio; McGillicuddy Jr, Dennis J; Moisander, Pia H; Moore, C Mark; Mouriño-Carballido, Beatriz; Mulholland, Margaret R; Needoba, Joseph A; Orcutt, Karen M; Poulton, Alex J; Rahav, Eyal; Raimbault, Patrick; Rees, Andrew; Riemann, Lasse; Shiozaki, Takuhei; Subramaniam, Ajit; Tyrrell, Toby; Turk-Kubo, Kendra A; Varela, Manuel; Villareal, Tracy A; Webb, Eric A; White, Angelicque E; Wu, Jingfeng; Zehr, Jonathan P (2012): Database of diazotrophs in global ocean: abundance, biomass and nitrogen fixation rates. Earth System Science Data, 4, 47-73, https://doi.org/10.5194/essd-4-47-2012
    Details
    Publication Date: 2023-03-27
    Description: The MAREDAT atlas covers 11 types of plankton, ranging in size from bacteria to jellyfish. Together, these plankton groups determine the health and productivity of the global ocean and play a vital role in the global carbon cycle. Working within a uniform and consistent spatial and depth grid (map) of the global ocean, the researchers compiled thousands and tens of thousands of data points to identify regions of plankton abundance and scarcity as well as areas of data abundance and scarcity. At many of the grid points, the MAREDAT team accomplished the difficult conversion from abundance (numbers of organisms) to biomass (carbon mass of organisms). The MAREDAT atlas provides an unprecedented global data set for ecological and biochemical analysis and modeling as well as a clear mandate for compiling additional existing data and for focusing future data gathering efforts on key groups in key areas of the ocean. This is a gridded data product about diazotrophic organisms . There are 6 variables. Each variable is gridded on a dimension of 360 (longitude) * 180 (latitude) * 33 (depth) * 12 (month). The first group of 3 variables are: (1) number of biomass observations, (2) biomass, and (3) special nifH-gene-based biomass. The second group of 3 variables is same as the first group except that it only grids non-zero data. We have constructed a database on diazotrophic organisms in the global pelagic upper ocean by compiling more than 11,000 direct field measurements including 3 sub-databases: (1) nitrogen fixation rates, (2) cyanobacterial diazotroph abundances from cell counts and (3) cyanobacterial diazotroph abundances from qPCR assays targeting nifH genes. Biomass conversion factors are estimated based on cell sizes to convert abundance data to diazotrophic biomass. Data are assigned to 3 groups including Trichodesmium, unicellular diazotrophic cyanobacteria (group A, B and C when applicable) and heterocystous cyanobacteria (Richelia and Calothrix). Total nitrogen fixation rates and diazotrophic biomass are calculated by summing the values from all the groups. Some of nitrogen fixation rates are whole seawater measurements and are used as total nitrogen fixation rates. Both volumetric and depth-integrated values were reported. Depth-integrated values are also calculated for those vertical profiles with values at 3 or more depths.
    Keywords: MAREMIP; MARine Ecosystem Model Intercomparison Project
    Type: Dataset
    Format: application/zip, 1.7 MBytes
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  • 6
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    Heterocyst glycolipids in surface sediments and water samples of the Amazon shelf (2015)
    PANGAEA
    In:  Supplement to: Bale, Nicole Jane; Hopmans, Ellen C; Zell, Claudia; de Lima Sobrinho, Rodrigo; Kim, Jung-Hyun; Sinninghe Damsté, Jaap S; Villareal, Tracy A; Schouten, Stefan (2015): Long chain glycolipids with pentose head groups as biomarkers for marine endosymbiotic heterocystous cyanobacteria. Organic Geochemistry, 81, 1-7, https://doi.org/10.1016/j.orggeochem.2015.01.004
    Details
    Publication Date: 2023-01-13
    Description: Marine endosymbiotic heterocystous cyanobacteria make unique heterocyst glycolipids (HGs) containing pentose (C5) moieties. Functionally similar HGs with hexose (C6) moieties found in free-living cyanobacteria occur in the sedimentary record, but C5 HGs have not been documented in the natural environment. Here we developed a high performance liquid chromatography multiple reaction monitoring (MRM) mass spectrometry (HPLC-MS2) method specific for trace analysis of long chain C5HGs and applied it to cultures of Rhizosolenia clevei Ostenfeld and its symbiont Richelia intracellularis which were found to contain C5 HGs and no C6 HGs. The method was then applied to suspended particulate matter (SPM) and surface sediment from the Amazon plume region known to harbor marine diatoms carrying heterocystous cyanobacteria as endosymbionts. C5 HGs were detected in both marine SPM and surface sediments, but not in SPM or surface sediment from freshwater settings in the Amazon basin. Rather, the latter contained C6 HGs, established biomarkers for free-living heterocystous cyanobacteria. Our results indicate that the C5 HGs may be potential biomarkers for marine endosymbiotic heterocystous cyanobacteria.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 7
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    C5 glycolipids of heterocystous cyanobacteria track symbiont abundance in the diatom Hemiaulus hauckii across the tropical North Atlantic (2018)
    PANGAEA
    In:  Supplement to: Bale, Nicole Jane; Villareal, Tracy A; Hopmans, Ellen C; Brussaard, Corina P D; Besseling, Marc; Dorhout, Denise J C; Sinninghe Damsté, Jaap S; Schouten, Stefan (2018): C5 glycolipids of heterocystous cyanobacteria track symbiont abundance in the diatom Hemiaulus hauckii across the tropical North Atlantic. Biogeosciences, 15, 1-13
    Details
    Publication Date: 2023-01-13
    Description: TS2Diatom-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 cyanobacterial HGs with predominantly hexose (C6) moieties. Here we applied a method for analysis of intact polar lipids to the study of HGs in suspended particulate matter (SPM) and surface sediment from across the tropical North Atlantic. The study focused on the Amazon plume region, where DDAs are documented to form extensive surface blooms, in order to examine the utility of C5 HGs as markers for DDAs as well as their transportation to underlying sediments. C30 and C32 triols with C5 pentose moieties were detected in both marine SPM and surface sediments. We found a significant correlation between the water column concentration of these long-chain C5 HGs and DDA symbiont counts. In particular, the concentrations of both the C5 HGs (1-(O-ribose)-3,27,29-triacontanetriol (C5 HG30 triol) and 1-(O-ribose)-3,29,31-dotriacontanetriol (C5 HG32 triol)) in SPM exhibited a significant correlation with the number of Hemiaulus hauckii symbionts. This result strengthens the idea that long-chain C5 HGs can be applied as biomarkers for marine endosymbiotic heterocystous cyanobacteria. The presence of the same C5 HGs in surface sediment provides evidence that they are effectively transported to the sediment and hence have potential as biomarkers for studies of the contribution of DDAs to the paleomarine N cycle.
    Keywords: NIOZ_UU; NIOZ Royal Netherlands Institute for Sea Research, and Utrecht University
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 8
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    Residual preformed nitrate and phosphate at Station ALOHA and BATS (2018)
    PANGAEA
    In:  Supplement to: Letscher, Robert T; Villareal, Tracy A (2018): Evaluation of the seasonal formation of subsurface negative preformed nitrate anomalies in the subtropical North Pacific and North Atlantic. Biogeosciences, 15(21), 6461-6480, https://doi.org/10.5194/bg-15-6461-2018
    Details
    Publication Date: 2023-01-13
    Description: The computed residual preformed nitrate and residual preformed phosphate tracers from the Hawaiian Ocean Time-Series Station ALOHA in the subtropical North Pacific from 1988-2016 and from the Bermuda Atlantic Time-series Site in the subtropical North Atlantic from 1992-2016. The computation of the residual preformed nitrate and phosphate tracer is defined and discussed in Letscher & Villareal, 2018, Biogeosciences.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 9
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    Residual preformed nitrate and phosphate at Station ALOHA (2018)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: ALOHA_Station; Calculated; Cruise/expedition; DATE/TIME; DEPTH, water; Hawaiian Islands, North Central Pacific; LATITUDE; LONGITUDE; Moana Wave; Neutral density; Nitrate, preformed, residual; Nitrate and Nitrite; Nitrogen, organic, dissolved; Nitrogen, total dissolved; OOS; Open ocean station; Oxygen; Oxygen, apparent utilization; Phosphate; Phosphate, preformed, residual; Salinity; ST-2; Temperature, water; Time point, descriptive
    Type: Dataset
    Format: text/tab-separated-values, 323220 data points
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  • 10
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    Nitrogen fixation rate of unicellular diazotrophs in the oligotrophic Pacific Ocean (2013)
    PANGAEA
    Details
    Publication Date: 2023-01-30
    Keywords: Calculated after Luo et al. (2012); Cook25_10; Cook25_11; Cook25_1a; Cook25_1b; Cook25_2; Cook25_3; Cook25_4; Cook25_5; Cook25_6; Cook25_7; Cook25_8; Cook25_9; Date/Time of event; DEPTH, water; Event label; EW9912_1999-10-10; EW9912_1999-10-20; EW9912_1999-10-25; EW9912_1999-11-10; EW9912_1999-11-15; Hawaiian Islands, North Central Pacific; Latitude of event; Longitude of event; MAREDAT_Diazotrophs_Collection; Nitrogen Fixation (C2H2 Reduction); Nitrogen fixation rate, total; Sample comment; Unicellular cyanobacteria, nitrogen fixation rate
    Type: Dataset
    Format: text/tab-separated-values, 61 data points
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