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  • 1
    Digitale Medien
    Digitale Medien
    A mesoscale phytoplankton bloom in the polar Southern Ocean stimulated by iron fertilization (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 407 (2000), S. 695-702 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Changes in iron supply to oceanic plankton are thought to have a significant effect on concentrations of atmospheric carbon dioxide by altering rates of carbon sequestration, a theory known as the ‘iron hypothesis’. For this reason, it is important to understand the response of ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/35037500
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 2
    Digitale Medien
    Digitale Medien
    Brown Tide blooms in Long Island’s coastal waters linked to interannual variability in groundwater flow (1997)
    Oxford, UK : Blackwell Science Ltd
    Global change biology 3 (1997), S. 0 
    Details
    ISSN: 1365-2486
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Energietechnik , Geographie
    Notizen: There has been a widespread increase in the reporting of harmful and ‘nuisance’ algal blooms in the coastal ocean over the past few decades. On the global scale this is suspected to be a consequence of coastal eutrophication, however, on a case-by-case basis there is usually insufficient evidence to discriminate between the effects of human and natural causal factors. Intense blooms of the ‘Brown Tide’ unicellular algae (Aureococcus anophagefferens) have occurred sporadically since 1985 in coastal waters of Eastern Long Island and have devastated the local commercial scallop fishery. Analysis of an 11-year time-series dataset from this region indicates that bloom intensity is correlated with higher salinities and inversely correlated with the discharge of groundwater. Laboratory and field studies suggest that whereas salinity is unlikely to represent a direct physiological control on Brown Tide blooms, the addition of inorganic nitrogen tends to inhibit Brown Tide blooms. Budget calculations indicate that the inorganic nitrogen supply from groundwater is 1–2 orders of magnitude higher than any other external source of nitrogen for this ecosystem. Biweekly time series data collected in 1995 demonstrate that Brown Tide blooms utilize dissolved organic nitrogen (DON) for growth, as evidenced by a large decrease in DON parallel with an increase in cell abundance. On an interannual basis, bloom intensity was also positively correlated with mean DON concentrations. We hypothesize that bloom initiation is regulated by the relative supply of inorganic and organic nitrogen, determined to a large extent by temporal variability in groundwater flow. The 1980s and 1990s were characterized by exceptionally high and interannually variable groundwater discharge, associated with a large-scale climate shift over the North Atlantic. This, coupled with the time-lagged discharge of groundwater with high nitrate concentrations resulting from increased fertilizer use and population increase during the 1960s and 1970s, may have been a key factor in the initiation of Brown Tide blooms in 1985.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2486.1997.00117.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Cloning and nucleotide sequence of a cDNA encoding a major fucoxanthin-, chlorophylla/c-containing protein from the chrysophyteIsochrysis galbana: implications for evolution of thecab gene family (1994)
    Springer
    Plant molecular biology 25 (1994), S. 355-368 
    Details
    ISSN: 1573-5028
    Schlagwort(e): cDNA ; cab ; chromophyte ; FCP ; Isochrysis galbana ; light-harvesting complex
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract We investigated the primary structure of a cDNA encoding a light-harvesting protein from the marine chrysophyteIsochrysis galbana. Antibodies raised against the major fucoxanthin, chlorophylla/c-binding light-harvesting protein (FCP) ofI. galbana were used to select a cDNA clone encoding one of the FCP apoproteins. The nucleic acid and deduced amino acid sequences reveal conserved regions within the first and third transmembrane spans with Chla/b-binding proteins and with FCPs of another chromophyte. However, the amino acid identity betweenI. galbana FCP and othercab genes of FCPs is only ca. 30%. Phylogenetic analyses demonstrated that the FCP genes of both diatoms and chrysophytes sequenced to date are more closely related tocab genes encoding LHC I, CP 29, and CP 24 of higher plants than tocab genes encoding LHC II of chlorophytes. We propose that LHC I, CP 24 and CP 29 and FCP might have originated from a common ancestral chl binding protein and that the major LHC II of Chla/b-containing organisms arose after the divergence between the chromophytes and the chlorophytes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00043865
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  • 4
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    Unbekannt
    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
    Publikationsdatum: 2023-03-27
    Beschreibung: 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.
    Schlagwort(e): MAREMIP; MARine Ecosystem Model Intercomparison Project
    Materialart: Dataset
    Format: application/zip, 1.7 MBytes
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  • 5
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    Unbekannt
    Abundance and calculated biomass of large-scale distribution from Atlantic nitrogen fixation controlled by iron availability (2013)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-08
    Schlagwort(e): AMT17/03; AMT17/04; AMT17/05; AMT17/06; AMT17/08; AMT17/10; Atlantic; Calculated after Luo et al. (2012); DEPTH, water; Diazotrophs, total biomass as carbon; Event label; Iron; Latitude of event; Light microscope; Longitude of event; MAREDAT_Diazotrophs_Collection; Nitrate; Phosphate; Salinity; Temperature, water; Trichodesmium, biomass as carbon; Trichodesmium, carbon per trichome; Trichodesmium abundance, free trichomes; Trichodesmium abundance, total
    Materialart: Dataset
    Format: text/tab-separated-values, 55 data points
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  • 6
    facet.materialart.
    Unbekannt
    Nitrogen fixation rate of large-scale distribution from Atlantic nitrogen fixation controlled by iron availability (2013)
    PANGAEA
    Details
    Publikationsdatum: 2023-07-08
    Schlagwort(e): AMT17/01; AMT17/02; AMT17/03; AMT17/04; AMT17/05; AMT17/06; AMT17/07; AMT17/08; AMT17/09; AMT17/10; Atlantic; Calculated after Luo et al. (2012); Date/Time of event; DEPTH, water; Event label; Iron; Latitude of event; Longitude of event; MAREDAT_Diazotrophs_Collection; Nitrate; Nitrogen Fixation (C2H2 Reduction); Nitrogen fixation rate, total; Nitrogen fixation rate, whole seawater; Phosphate; Salinity; Temperature, water
    Materialart: Dataset
    Format: text/tab-separated-values, 275 data points
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  • 7
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    Unbekannt
    Nitrogen fixation and nitrogen gene abundance of METEOR cruises M77/3 and M77/4 (2014)
    PANGAEA
    In:  Supplement to: Löscher, Carolin R; Großkopf, Tobias; Desai, Falguni; Gill, Diana; Schunck, Harald; Croot, Peter L; Schlosser, Christian; Neulinger, Sven C; Pinnow, Nicole; Lavik, Gaute; Kuypers, Marcel MM; LaRoche, Julie; Schmitz, Ruth A (2014): Facets of diazotrophy in the oxygen minimum zone waters off Peru. The ISME Journal, https://doi.org/10.1038/ismej.2014.71
    Details
    Publikationsdatum: 2023-10-28
    Beschreibung: Nitrogen fixation, the biological reduction of dinitrogen gas (N2) to ammonium (NH4+), is quantitatively the most important external source of new nitrogen (N) to the open ocean. Classically, the ecological niche of oceanic N2 fixers (diazotrophs) is ascribed to tropical oligotrophic surface waters, often depleted in fixed N, with a diazotrophic community dominated by cyanobacteria. Although this applies for large areas of the ocean, biogeochemical models and phylogenetic studies suggest that the oceanic diazotrophic niche may be much broader than previously considered, resulting in major implications for the global N-budget. Here, we report on the composition, distribution and abundance of nifH, the functional gene marker for N2 fixation. Our results show the presence of eight clades of diazotrophs in the oxygen minimum zone (OMZ) off Peru. Although proteobacterial clades dominated overall, two clusters affiliated to spirochaeta and archaea were identified. N2 fixation was detected within OMZ waters and was stimulated by the addition of organic carbon sources supporting the view that non-phototrophic diazotrophs were actively fixing dinitrogen. The observed co-occurrence of key functional genes for N2 fixation, nitrification, anammox and denitrification suggests that a close spatial coupling of N-input and N-loss processes exists in the OMZ off Peru. The wide distribution of diazotrophs throughout the water column adds to the emerging view that the habitat of marine diazotrophs can be extended to low oxygen/high nitrate areas. Furthermore, our statistical analysis suggests that NO2- and PO43- are the major factors affecting diazotrophic distribution throughout the OMZ. In view of the predicted increase in ocean deoxygenation resulting from global warming, our findings indicate that the importance of OMZs as niches for N2 fixation may increase in the futur
    Schlagwort(e): Climate - Biogeochemistry Interactions in the Tropical Ocean; SFB754
    Materialart: Dataset
    Format: application/zip, 3 datasets
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  • 8
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    Unbekannt
    Hydrochemistry measurements and diazotroph abundances (2016)
    PANGAEA
    In:  Supplement to: Martínez-Pérez, Clara; Mohr, Wiebke; Löscher, Carolin R; Dekaezemacker, Julien; Littmann, Sten; Yilmaz, Pelin; Lehnen, Christina; Fuchs, Bernhard M; Lavik, Gaute; Schmitz, Ruth A; LaRoche, Julie; Kuypers, Marcel MM (2016): The small unicellular diazotrophic symbiont, UCYN-A, is a key player in the marine nitrogen cycle. Nature Microbiology, 1, 16163, https://doi.org/10.1038/nmicrobiol.2016.163
    Details
    Publikationsdatum: 2023-10-28
    Beschreibung: Microbial dinitrogen (N2) fixation, the nitrogenase enzyme-catalysed reduction of N2 gas into biologically available ammonia, is the main source of new nitrogen (N) in the ocean. For more than 50 years, oceanic N2 fixation has mainly been attributed to the activity of the colonial cyanobacterium Trichodesmium. Other smaller N2-fixing microorganisms (diazotrophs)--in particular the unicellular cyanobacteria group A (UCYN-A)--are, however, abundant enough to potentially contribute significantly to N2 fixation in the surface waters of the oceans. Despite their abundance, the contribution of UCYN-A to oceanic N2 fixation has so far not been directly quantified. Here, we show that in one of the main areas of oceanic N2 fixation, the tropical North Atlantic7, the symbiotic cyanobacterium UCYN-A contributed to N2 fixation similarly to Trichodesmium. Two types of UCYN-A, UCYN-A1 and -A2, were observed to live in symbioses with specific eukaryotic algae. Single-cell analyses showed that both algae-UCYN-A symbioses actively fixed N2, contributing ~20% to N2 fixation in the tropical North Atlantic, revealing their significance in this region. These symbioses had growth rates five to ten times higher than Trichodesmium, implying a rapid transfer of UCYN-A-fixed N into the food web that might significantly raise their actual contribution to N2 fixation. Our analysis of global 16S rRNA gene databases showed that UCYN-A occurs in surface waters from the Arctic to the Antarctic Circle and thus probably contributes to N2 fixation in a much larger oceanic area than previously thought. Based on their high rates of N2 fixation and cosmopolitan distribution, we hypothesize that UCYN-A plays a major, but currently overlooked role in the oceanic N cycle.
    Schlagwort(e): Center for Marine Environmental Sciences; Climate - Biogeochemistry Interactions in the Tropical Ocean; MARUM; SFB754
    Materialart: Dataset
    Format: application/zip, 2 datasets
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  • 9
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    Unbekannt
    Bacterial nitrogen fixation abundance of METEOR cruise M77/3 (2014)
    PANGAEA
    Details
    Publikationsdatum: 2023-10-28
    Schlagwort(e): Bacterial nitrogen fixation, cluster; Bacterial nitrogen fixation, cluster, standard deviation; Bacterial nitrogen fixation, total; Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Event label; Latitude of event; Longitude of event; M77/3; M77/3-CTD109; M77/3-CTD110; M77/3-CTD13; M77/3-CTD14; M77/3-CTD15; M77/3-CTD17; M77/3-CTD19; M77/3-CTD21; M77/3-CTD24; M77/3-CTD25; M77/3-CTD4; M77/3-CTD55; M77/3-CTD57; M77/3-CTD58; M77/3-CTD59; M77/3-CTD6; M77/3-CTD60; M77/3-CTD62; M77/3-CTD63; M77/3-CTD67; M77/3-CTD7; M77/3-CTD70; M77/3-CTD71; Meteor (1986); Sample code/label; SFB754; Standard deviation; Station label
    Materialart: Dataset
    Format: text/tab-separated-values, 5138 data points
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  • 10
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    Unbekannt
    Bacterial nitrogen fixation abundance of METEOR cruise M77/4 (2014)
    PANGAEA
    Details
    Publikationsdatum: 2023-10-28
    Schlagwort(e): Bacterial nitrogen fixation, cluster; Bacterial nitrogen fixation, cluster, standard deviation; Bacterial nitrogen fixation, total; Climate - Biogeochemistry Interactions in the Tropical Ocean; CTD/Rosette; CTD-RO; Date/Time of event; DEPTH, water; Event label; Latitude of event; Longitude of event; M77/4; M77/4_143; M77/4_152; M77/4_160; M77/4-CTD14; M77/4-CTD18; M77/4-CTD23; M77/4-CTD24; M77/4-CTD29; M77/4-CTD34; M77/4-CTD38; M77/4-CTD39; M77/4-CTD40; M77/4-CTD58; M77/4-CTD68; M77/4-CTD73; M77/4-CTD75; M77/4-CTD79; M77/4-CTD81; M77/4-CTD82; M77/4-CTD90; Meteor (1986); Sample code/label; SFB754; Standard deviation; Station label
    Materialart: Dataset
    Format: text/tab-separated-values, 1674 data points
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