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  • 1
    Electronic Resource
    Electronic Resource
    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
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [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 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35037500
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A sensitive fluorometric technique for the measurement of phycobilin pigments and its application to the study of marine and freshwater picophytoplankton in oligotrophic environments (1998)
    Springer
    Journal of applied phycology 10 (1998), S. 357-363 
    Details
    ISSN: 1573-5176
    Keywords: picophytoplankton ; C-phycocyanin ; C-phycoerythrin ; R-phycoerythrin ; fluorescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A sensitive and specific technique is described for the estimation of phycobiliprotein in freshwater and marine picophytoplankton. The method uses fluorescent properties to detect phycoerythrin concentrations as low as 40 ng L-1 from a 1 L water sample and is capable of distinguishing between R-phycoerythrin, C-phycocyanin and C-phycoerythrin. The application of the method to the study of natural picophytoplankton populations in marine and freshwater environments is described. Nitrate concentrations appear to influence picophytoplankton cellular C-phycoerythrin concentrations in surface waters and increasing cellular C-phycoerythrin fluorescence with water depth suggests that this pigment plays a role as a photosynthetic accessory pigment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008085719486
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Factors controlling the growth of field populations of Hydrodictyon reticulatum in New Zealand (1997)
    Springer
    Journal of applied phycology 9 (1997), S. 229-236 
    Details
    ISSN: 1573-5176
    Keywords: nutrients ; growth rate ; Hydrodictyon reticulatum ; seasonal changes ; temperature ; growth prediction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Since Hydrodictyon reticulatum was introduced to New Zealand it has spread rapidly and produced persistent annual nuisance growths in areas where nuisance algal had not occurred previously. Field bioassays were conducted at 10 sites between August 1993 and February 1995 to evaluate the seasonal growth patterns and the factors controlling growth under natural conditions. H. reticulatum exhibited a strong seasonal growth pattern with growth rates up to 0.33 doublings d-1 from August to March, are duction in growth rate in April and little or no growth from May to July. The H. reticulatum present in New Zealand has are latively low requirement for dissolved inorganic nitrogen (DIN) in comparison with other nuisance species, with its growth rate being saturated at 200 mg m-3. This and the high affinity for DIN as shown by a Ks of 29 mg m-3 have been key factors in the establishment of nuisance growths of H. reticulatum in New Zealand.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007988412729
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    Paper (German National Licenses)
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  • 4
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    Dissolved iron and Fe(II) in an iron induced Southern Ocean phytoplankton bloom measured during TANGAROA cruise SOIREE (2014)
    PANGAEA
    In:  Supplement to: Croot, Peter L; Bowie, Andrew R; Frew, Russell; Maldonado, Maria T; Hall, Julie A; Safi, Karl A; La Roche, Julie; Boyd, Philip W; Law, Cliff S (2001): Retention of dissolved iron and Fe II in an iron induced Southern Ocean phytoplankton bloom. Geophysical Research Letters, 28(18), 3425-3428, https://doi.org/10.1029/2001GL013023
    Details
    Publication Date: 2023-01-13
    Description: During the 13 day Southern Ocean Iron RE-lease Experiment (SOIREE), dissolved iron concentrations decreased rapidly following each of three iron-enrichments, but remained high (〉1 nM, up to 80% as FeII) after the fourth and final enrichment on day 8. The former trend was mainly due to dilution (spreading of iron-fertilized waters) and particle scavenging. The latter may only be explained by a joint production-maintenance mechanism; photoreduction is the only candidate process able to produce sufficiently high FeII, but as such levels persisted overnight (8 hr dark period) -ten times the half-life for this species- a maintenance mechanism (complexation of FeII) is required, and is supported by evidence of increased ligand concentrations on day 12. The source of these ligands and their affinity for FeII is not known. This retention of iron probably permitted the longevity of this bloom raising fundamental questions about iron cycling in HNLC (High Nitrate Low Chlorophyll) Polar waters.
    Keywords: Comment; Date/Time of event; DEPTH, water; Error; Event label; GOFLO; Go-Flo bottles; Iron, dissolved; Iron, dissolved, conditional complex stability; Iron-binding ligand, dissolved; Latitude of event; Longitude of event; SOIREE; Southern Ocean - Australasian-Pacific Sector; T1136-1; T1139-1; T1140-6; T1141-6; T1144-6; T1151-5; T1152-5; T1158-5; T1159-6; T1160-3; T1162-4; T1171-5; Tangaroa; Voltammetry
    Type: Dataset
    Format: text/tab-separated-values, 64 data points
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  • 5
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    Microbiology of the IN- and OUT-patch defined iron-fertilized areas in the Southern Ocean (2001)
    PANGAEA
    In:  Supplement to: Hall, Julie A; Safi, Karl A (2001): The impact of in situ Fe fertilisation on the microbial food web in the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, 48(11-12), 2591-2613, https://doi.org/10.1016/S0967-0645(01)00010-8
    Details
    Publication Date: 2024-02-01
    Description: During the Southern Ocean iron release experiment (SOIREE) in February 1999, the composition and dynamics of the microbial food web were studied. SOIREE was a mesoscale experiment with four infusions of Fe into the patch to elevate Fe concentrations inside the patch. During the 13 d experiment, samples were collected from the mixed layer inside and outside the patch for the enumeration of bacteria, picophytoplankton, phyto and heterotrophic nanoflagellates, ciliates, and for estimation of bacterial production and microzooplankton grazing. Inside the patch, bacterial numbers remained constant throughout SOIREE although bacterial production increased three-fold. A strong relationship between the increase in bacterial and primary production suggested that dissolved organic carbon and nitrogen, rather than Fe, potentially limited bacterial growth. The picophytoplankton population, was composed solely of eukaryotic cells and increased three-fold over the first 7 d of the experiment before decreasing to initial concentrations of approximately 4000 cells/ml. In contrast to the bacterial and picophytoplankton populations, the nanophytoflagellate population increased six-fold in numbers and 23-fold in biomass. This resulted in a three-fold increase in carbon flow through the microbial food web inside the patch by the end of the experiment. The increased carbon flow resulted in a small increase in total microzooplankton biomass. Ciliate abundances tripled and biomass, doubled; however, the ciliate population only contributed 3-10% of the microzooplankton biomass, which was dominated by the heterotrophic nanoflagellate population. The heterotrophic nanoflagellate numbers decreased three-fold by the end of the experiment; however, there was no significant change in biomass throughout the experiment. The changes in the dynamics and structure of the microbial food web during the SOIREE experiment suggest that microzooplankton grazing controlled the bacterial and possibly the picophytoplankton populations. In contrast, the nanophytoflagellates were initially controlled by the Fe concentration, with microzooplankton having an impact on the population towards the end of the experiment. The addition of Fe to a small patch of the Southern Ocean had a considerable impact on the microbial components of the food web, even though the overall importance of the microbial pathways decreased as a result of Fe addition.
    Keywords: JGOFS; Joint Global Ocean Flux Study
    Type: Dataset
    Format: application/zip, 14 datasets
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  • 6
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    Microbiology of the IN-patch defined iron-fertilized area of T1144-2 (2001)
    PANGAEA
    Details
    Publication Date: 2024-02-01
    Keywords: Bacteria; Bacteria, biomass as carbon; Bacteria, production as carbon; Calculated, see reference(s); Ciliates; Ciliates, aloricate, biomass as carbon, fractionated; Ciliates, aloricate, fractionated; Ciliates, biomass as carbon; Ciliates indeterminata; Counting by flow cytometer; CTD/Rosette; CTD-RO; DEPTH, water; Inverted microscopy; JGOFS; Joint Global Ocean Flux Study; Microzooplankton, biomass as carbon; Nanoflagellates, autotrophic; Nanoflagellates, autotrophic, biomass as carbon; Nanoflagellates, autotrophic, cell biovolume; Nanoflagellates, heterotrophic; Nanoflagellates, heterotrophic, biomass as carbon; Nanoflagellates, heterotrophic, cell biovolume; Picoeukaryotes; Picoeukaryotes, biomass as carbon; see reference(s); SOIREE; Southern Ocean - Australasian-Pacific Sector; T1144-5; Tangaroa; Tintinnid; Tintinnid, biomass as carbon
    Type: Dataset
    Format: text/tab-separated-values, 120 data points
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  • 7
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    Microbiology of the IN-patch defined iron-fertilized area of T1151-2 (2001)
    PANGAEA
    Details
    Publication Date: 2024-02-01
    Keywords: Bacteria; Bacteria, biomass as carbon; Bacteria, production as carbon; Calculated, see reference(s); Ciliates; Ciliates, aloricate, biomass as carbon, fractionated; Ciliates, aloricate, fractionated; Ciliates, biomass as carbon; Ciliates indeterminata; Counting by flow cytometer; CTD/Rosette; CTD-RO; DEPTH, water; Inverted microscopy; JGOFS; Joint Global Ocean Flux Study; Microzooplankton, biomass as carbon; Nanoflagellates, autotrophic; Nanoflagellates, autotrophic, biomass as carbon; Nanoflagellates, autotrophic, cell biovolume; Nanoflagellates, heterotrophic; Nanoflagellates, heterotrophic, biomass as carbon; Nanoflagellates, heterotrophic, cell biovolume; Picoeukaryotes; Picoeukaryotes, biomass as carbon; see reference(s); SOIREE; Southern Ocean - Australasian-Pacific Sector; T1151-4; Tangaroa; Tintinnid; Tintinnid, biomass as carbon
    Type: Dataset
    Format: text/tab-separated-values, 126 data points
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  • 8
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    Microbiology of the IN-patch defined iron-fertilized area of T1171-2 (2001)
    PANGAEA
    Details
    Publication Date: 2024-02-01
    Keywords: Bacteria; Bacteria, biomass as carbon; Bacteria, production as carbon; Calculated, see reference(s); Ciliates; Ciliates, aloricate, biomass as carbon, fractionated; Ciliates, aloricate, fractionated; Ciliates, biomass as carbon; Ciliates indeterminata; Counting by flow cytometer; CTD/Rosette; CTD-RO; DEPTH, water; Inverted microscopy; JGOFS; Joint Global Ocean Flux Study; Microzooplankton, biomass as carbon; Nanoflagellates, autotrophic; Nanoflagellates, autotrophic, biomass as carbon; Nanoflagellates, autotrophic, cell biovolume; Nanoflagellates, heterotrophic; Nanoflagellates, heterotrophic, biomass as carbon; Nanoflagellates, heterotrophic, cell biovolume; Picoeukaryotes; Picoeukaryotes, biomass as carbon; see reference(s); SOIREE; Southern Ocean - Australasian-Pacific Sector; T1171-4; Tangaroa; Tintinnid; Tintinnid, biomass as carbon
    Type: Dataset
    Format: text/tab-separated-values, 121 data points
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  • 9
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    Microbiology of the OUT-patch defined iron-fertilized area of T1168-6 (2001)
    PANGAEA
    Details
    Publication Date: 2024-02-01
    Keywords: Bacteria; Bacteria, biomass as carbon; Bacteria, production as carbon; Calculated, see reference(s); Ciliates; Ciliates, aloricate, biomass as carbon, fractionated; Ciliates, aloricate, fractionated; Ciliates, biomass as carbon; Ciliates indeterminata; Counting by flow cytometer; CTD/Rosette; CTD-RO; DEPTH, water; Inverted microscopy; JGOFS; Joint Global Ocean Flux Study; Microzooplankton, biomass as carbon; Nanoflagellates, autotrophic; Nanoflagellates, autotrophic, biomass as carbon; Nanoflagellates, autotrophic, cell biovolume; Nanoflagellates, heterotrophic; Nanoflagellates, heterotrophic, biomass as carbon; Nanoflagellates, heterotrophic, cell biovolume; Picoeukaryotes; Picoeukaryotes, biomass as carbon; see reference(s); SOIREE; Southern Ocean - Australasian-Pacific Sector; T1168-6; Tangaroa; Tintinnid; Tintinnid, biomass as carbon
    Type: Dataset
    Format: text/tab-separated-values, 126 data points
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  • 10
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    Microbiology of the IN-patch defined iron-fertilized area of T1139-4 (2001)
    PANGAEA
    Details
    Publication Date: 2024-02-01
    Keywords: Bacteria; Bacteria, biomass as carbon; Calculated, see reference(s); Ciliates; Ciliates, aloricate, biomass as carbon, fractionated; Ciliates, aloricate, fractionated; Ciliates, biomass as carbon; Ciliates indeterminata; Counting by flow cytometer; CTD/Rosette; CTD-RO; DEPTH, water; Inverted microscopy; JGOFS; Joint Global Ocean Flux Study; Microzooplankton, biomass as carbon; Nanoflagellates, autotrophic; Nanoflagellates, autotrophic, biomass as carbon; Nanoflagellates, autotrophic, cell biovolume; Nanoflagellates, heterotrophic; Nanoflagellates, heterotrophic, biomass as carbon; Nanoflagellates, heterotrophic, cell biovolume; Picoeukaryotes; Picoeukaryotes, biomass as carbon; see reference(s); SOIREE; Southern Ocean - Australasian-Pacific Sector; T1139-4; Tangaroa; Tintinnid; Tintinnid, biomass as carbon
    Type: Dataset
    Format: text/tab-separated-values, 120 data points
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