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  • PANGAEA  (141)
  • Wiley  (2)
  • Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung  (1)
  • Nature  (1)
Document type
Keywords
Publisher
Language
Years
  • 1
    Book
    Book
    Distribution and role of microprotozoa in the Southern Ocean : = Verteilung und Einfluß von herbivoren Protozoen auf Phytoplanktonbestände und Vertikalflüsse im Südpolarmeer (1997)
    Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung
    Details Availability
    Keywords: Hochschulschrift ; Forschungsbericht ; Südpolarmeer ; Phytoplankton ; Zooplankton ; Antarktis ; Polarmeer ; Mikroplankton ; Wahrscheinlichkeitsverteilung ; Südpolarmeer ; Phytoplankton ; Zooplankton ; Antarktis ; Polarmeer ; Mikroplankton ; Wahrscheinlichkeitsverteilung ; Phytoplankton ; Südpolarmeer
    Type of Medium: Book
    Pages: 119 S. , graph. Darst.
    Series Statement: Berichte zur Polarforschung 253
    URL: http://www.gbv.de/dms/bs/toc/238836916.pdf
    URL: http://www.gbv.de/dms/bs/toc/238836916.pdf
    RVK:
    RZ 95507
    RVK:
    RY 20075
    Language: English
    Note: Literaturverz. S. 105 - 119 , Intermediärsprache: Deutsch , Teilw. zugl.: Bremen, Univ., Diss., 1996
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  • 2
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    Data base on pelagic ciliates grazing and growth rate as a function of size, prey size and type compiled from the literature (2011)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2023-03-16
    Description: Microzooplankton (the 20 to 200 µm size class of zooplankton) is recognised as an important part of marine pelagic ecosystems. In terms of biomass and abundance pelagic ciliates are one of the important groups of organism in microzooplankton. However, their rates - grazing and growth - , feeding behaviour and prey preferences are poorly known and understood. A set of data was assembled in order to derive a better understanding of pelagic ciliates rates, in response to parameters such as prey concentration, prey type (size and species), temperature and their own size. With these objectives, literature was searched for laboratory experiments with information on one or more of these parameters effect studied. The criteria for selection and inclusion in the database included: (i) controlled laboratory experiment with a known ciliates feeding on a known prey; (ii) presence of ancillary information about experimental conditions, used organisms - cell volume, cell dimensions, and carbon content. Rates and ancillary information were measured in units that meet the experimenter need, creating a need to harmonize the data units after collection. In addition different units can link to different mechanisms (carbon to nutritive quality of the prey, volume to size limits). As a result, grazing rates are thus available as pg C/(ciliate*h), µm**3/(ciliate*h) and prey cell/(ciliate*h); clearance rate was calculated if not given and growth rate is expressed as the growth rate per day.
    Keywords: EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis
    Type: Dataset
    Format: application/zip, 1.4 MBytes
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    DATA PANGAEA
  • 3
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    Data base on heterotrophic dinoflagellates grazing and growth rate as a function of size, prey size and type compiled from the literature (2011)
    PANGAEA
    In:  Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven
    Details
    Publication Date: 2023-03-16
    Description: Microzooplankton (the 20 to 200 µm size class of zooplankton) is recognised as an important part of marine pelagic ecosystems. In terms of biomass and abundance heterotrophic dinoflagellates are one of the important groups of organism in microzooplankton. However, their rates - grazing and growth - , feeding behaviour and prey preferences are poorly known and understood. A set of data was assembled in order to derive a better understanding of heterotrophic dinoflagellates rates, in response to parameters such as prey concentration, prey type (size and species), temperature and their own size. With these objectives, literature was searched for laboratory experiments with information on one or more of these parameters effect studied. The criteria for selection and inclusion in the database included: (i) controlled laboratory experiment with a known dinoflagellate feeding on a known prey; (ii) presence of ancillary information about experimental conditions, used organisms - cell volume, cell dimensions, and carbon content. Rates and ancillary information were measured in units that meet the experimenter need, creating a need to harmonize the data units after collection. In addition different units can link to different mechanisms (carbon to nutritive quality of the prey, volume to size limits). As a result, grazing rates are thus available as pg C dinoflagellate-1 h-1, µm3 dinoflagellate-1 h-1 and prey cell dinoflagellate-1 h-1; clearance rate was calculated if not given and growth rate is expressed as the growth rate per day.
    Keywords: EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis
    Type: Dataset
    Format: application/zip, 425.4 kBytes
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    DATA PANGAEA
  • 4
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    Using the silica deposition fluorescent probe PDMPO to determine growth rates of diatoms in the laboratory (2023)
    PANGAEA
    Details
    Publication Date: 2023-06-30
    Description: The fluorophore [2-(4-pyridyl)-5{[4-dimethylaminoethyl-aminocarbamoyl)-methoxy]phenyl}oxazole], in short PDMPO, is incorporated in newly polymerized silica in diatom frustules and thereby provides a tool to estimate Si uptake, to study diatom cell cycles but also to determine mortality-independent abundance-based species specific growth rates in cultures and natural assemblages. In this study, the theoretical framework and applicability of the PDMPO staining technique to estimate diatom species specific growth rates were investigated. Three key polar diatom species, Pseudonitzschia subcurvata, Chaetoceros simplex and Thalassiosira sp., chosen to cover a broad range of species-related frustule and life-cycle characteristics, were incubated over 24 hours in control (no PDMPO) and with 0.125 µM and 0.6 µM PDMPO addition, respectively. The main assumptions tested during this study were: 1) Addition of PDMPO does not affect division rates. 2) Newly divided cells (daughter cells) can be readily recognized by their fluorescent valves and PDMPO is taken up only in newly formed valves. 3) The populations do not divide synchronously (here the impact of light-dark cycles on division was also included). Assumptions 1 and 2 were tested by comparing cell concentration-based growth rates with those based on PDMPO stain in control incubations and in incubations where PDMPO was added. This was carried out for P. subcurvata (Ps), C. simplex (Cs) and Thalassiosira sp. (Ts) acclimated to 20 µmol photon/m²/s at 0.125 µM (all species) and 0.6 µM (for Ps and Cs) PDMPO final concentration. The impact of PDMPO addition was further tested on Thalassiosira sp. acclimated at 110 µmol photon/m²/s at both 0.125 µM and 0.6 µM PDMPO final concentration.
    Keywords: biological oceanography; diatoms; in situ growth rates; Laboratory experiment; method; Phytoplankton
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 5
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    Thorium-234, POC and PON fluxes during POLARSTERN cruise ANT-XXVIII/3, January-March 2012 (2015)
    PANGAEA
    In:  Supplement to: Roca-Martí, Montserrat; Puigcorbé, Viena; Iversen, Morten Hvitfeldt; Rutgers van der Loeff, Michiel M; Klaas, Christine; Cheah, Wee; Bracher, Astrid; Masqué, Pere (2015): High particulate organic carbon export during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean. Deep Sea Research Part II: Topical Studies in Oceanography, https://doi.org/10.1016/j.dsr2.2015.12.007
    Details
    Publication Date: 2023-08-01
    Description: Carbon fixation by phytoplankton plays a key role in the uptake of atmospheric CO2 in the Southern Ocean. Yet, it still remains unclear how efficiently the particulate organic carbon (POC) is exported and transferred from ocean surface waters to depth during phytoplankton blooms. In addition, little is known about the processes that control the flux attenuation within the upper twilight zone. Here, we present results of downward POC and particulate organic nitrogen fluxes during the decline of a vast diatom bloom in the Atlantic sector of the Southern Ocean in summer 2012. We used thorium-234 (234Th) as a particle tracer in combination with drifting sediment traps (ST). Their simultaneous use evidenced a sustained high export rate of 234Th at 100 m depth in the weeks prior to and during the sampling period. The entire study area, of approximately 8000 km**2, showed similar vertical export fluxes in spite of the heterogeneity in phytoplankton standing stocks and productivity, indicating a decoupling between production and export. The POC fluxes at 100 m were high, averaging 26 ± 15 mmol C/m**2/d, although the strength of the biological pump was generally low. Only 〈20% of the daily primary production reached 100 m, presumably due to an active recycling of carbon and nutrients. Pigment analyses indicated that direct sinking of diatoms likely caused the high POC transfer efficiencies (~60%) observed between 100 and 300 m, although faecal pellets and transport of POC linked to zooplankton vertical migration might have also contributed to downward fluxes.
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 6
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    Less Antarctic sea ice may not mean fewer krill (2017)
    PANGAEA
    In:  Supplement to: Meyer, Bettina; Freier, Ulrich; Grimm, Volker; Groeneveld, Jürgen; Hunt, Brian P V; Kerwath, Sven; King, Rob; Klaas, Christine; Pakhomov, Evgeny A; Melbourne-Thomas, Jess; Murphy, Eugene J; Thorpe, Sally; Stammerjohn, Sharon; Wolf-Gladrow, Dieter A; Auerswald, Lutz; Götz, Albrecht; Halbach, Laura; Jarman, Simon; Kawaguchi, So; Krumpen, Thomas; Meiners, Klaus M; Nehrke, Gernot; Ricker, Robert; Summer, Michael; Teschke, Mathias; Trebilco, Rowan; Yilmaz, Noyan (2017): The winter pack ice zone provides a sheltered but food-poor habitat for larval Antarctic krill. Nature Ecology & Evolution, https://doi.org/10.1038/s41559-017-0368-3
    Details
    Publication Date: 2023-08-01
    Description: A dominant Antarctic ecological paradigm suggests that winter sea ice is the feeding ground for krill larvae. However, several recent observations conflict with this hypothesis. Our study presents the first direct evidence that winter sea ice is actually a food-poor environment when compared to neighbouring open water regions. We found that complex under ice habitats are vital for larval krill, providing shelter from currents. During the day the larvae feed on the sparse ice-associated food but after sunset, they migrate into the water below the ice. This behaviour allows access to more food and promotes the dispersal of larvae to spring feeding grounds. Current larval krill overwintering and nursery habitats in the SW Atlantic are predicted to become ice-free in the future. This will lead to an enhanced food supply and faster larval development and growth but might increase the dispersal of larvae out of the SW Atlantic ecosystem.
    Type: Dataset
    Format: application/zip, 9 datasets
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    DATA PANGAEA
  • 7
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    Morphometric comparison of three Southern Ocean Fragilariopsis species (2017)
    PANGAEA
    In:  Supplement to: Beszteri, Bánk; Allen, Claire Susannah; Almandoz, Gastón Osvaldo; Armand, Leanne K; Bárcena, María Angeles; Cantzler, Hannelore; Crosta, Xavier; Esper, Oliver; Jordan, Richard William; Kauer, Gerhard; Klaas, Christine; Kloster, Michael; Leventer, Amy; Pike, Jennifer; Rigual-Hernandez, Andrés S (2018): Quantitative comparison of taxa and taxon concepts in the diatom genus Fragilariopsis: a case study on using slide scanning, multiexpert image annotation, and image analysis in taxonomy¹. Journal of Phycology, 54(5), 703-719, https://doi.org/10.1111/jpy.12767
    Details
    Publication Date: 2023-10-28
    Description: While attempting to assemble a reference image set of Southern Ocean diatoms for training automatic classification algorithms, we encountered numerous specimens which we were unable to classify unequivocally into one of three highly similar Fragilariopsis species. Problems about the delimitation of these species were also raised at the last Polar Marine Diatom Workshop in 2015 in Salamanca. The present study originated from these two sources. Using semi-automated microscopy and image analyses, we assembled a set of 501 specimen images and accompanying morphometric data, and 12 members of the polar marine diatomist community contributed their identification of these specimens independently from each other. After comparing the identification results themselves, we used the morphometric features extracted in an attempt to clarify the nature of morphometric distinction of the three taxa in uni-and bivariate analyses, and performed multivariate classification experiments and tested their agreement with expert consensus opinion. Beyond the specific insights into morphometric distinction of the studied taxa, our study also highlights some of the more generic challenges and possibilities of research at the interface between automatic identification and traditional taxonomy.
    Keywords: Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas; SPP1158
    Type: Dataset
    Format: application/zip, 234.8 MBytes
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    DATA PANGAEA
  • 8
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    Iron redox speciation during ANT-XXV/3 - LOHAFEX fertilization experiment (2021)
    PANGAEA
    Details
    Publication Date: 2023-07-25
    Description: This dataset includes all the Fe(II) measurements carried out during the LOHAFEX ocean iron fertilization (January- March 2009) in waters of a stable eddy located in the Atlantic sector of the Southern Ocean. Data serve the purpose to compare the effect of physicochemical and biological variables in changes in the proportion of Fe(II)/Fe(III) concentrations during the development of a flagellate/copepod bloom. Measurements were performed with a flow injection system where seawater is mixed with an alkaline luminol solution that emits lights proportionally to the concentration of reduced iron (Fe(II)). Data are split in one file showing Fe(II) concentrations before and after filtration through 0.2 mm in the upper 200 m of the water column and several files showing Fe(II) concentrations in unfiltered seawater collected with the underway sampling (11 m deep) while sailing across the fertilized patch. This is the first data sets that address the contribution of particles to Fe(II) concentrations in seawater. Transect Fe(II) data are accompanied by photosynthetic quantum efficiency (FV/FM) and chlorophyll-a data that allow the precise location of the fertilized patch edge.
    Keywords: Fe(II); iron speciation; redox reactions
    Type: Dataset
    Format: application/zip, 9 datasets
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    DATA PANGAEA
  • 9
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    Chlorophyll a, primary production and nutrients during POLARSTERN cruise ANT-XXVIII/2 (2017)
    PANGAEA
    In:  Supplement to: Hoppe, Clara Jule Marie; Klaas, Christine; Ossebaar, Sharyn; Soppa, Mariana A; Cheah, Wee; Laglera, Luis Miguel; Santos-Echeandía, Juan; Rost, Björn; Wolf-Gladrow, Dieter A; Bracher, Astrid; Hoppema, Mario; Strass, Volker H; Trimborn, Scarlett (2017): Controls of primary production in two phytoplankton blooms in the Antarctic Circumpolar Current. Deep Sea Research Part II: Topical Studies in Oceanography, 138, 63-73, https://doi.org/10.1016/j.dsr2.2015.10.005
    Details
    Publication Date: 2023-10-18
    Description: The Antarctic Circumpolar Current has a high potential for primary production and carbon sequestration through the biological pump. In the current study, two large-scale blooms observed in 2012 during a cruise with R.V. Polarstern were investigated with respect to phytoplankton standing stocks, primary productivity and nutrient budgets. While net primary productivity was similar in both blooms, chlorophyll a -specific photosynthesis was more efficient in the bloom closer to the island of South Georgia (39 °W, 50 °S) compared to the open ocean bloom further east (12 °W, 51 °S). We did not find evidence for light being the driver of bloom dynamics as chlorophyll standing stocks up to 165 mg/m² developed despite mixed layers as deep as 90 m. Since the two bloom regions differ in their distance to shelf areas, potential sources of iron vary. Nutrient (nitrate, phosphate, silicate) deficits were similar in both areas despite different bloom ages, but their ratios indicated more pronounced iron limitation at 12 °W compared to 39 °W. While primarily the supply of iron and not the availability of light seemed to control onset and duration of the blooms, higher grazing pressure could have exerted a stronger control toward the declining phase of the blooms.
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 10
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    Data compilation of dinoflagellates growth rate, grazing rate and gross gowth efficiency from field and labratory experiments (2013)
    PANGAEA
    Details
    Publication Date: 2024-01-26
    Description: The present data compilation includes dinoflagellates growth rate, grazing rate and gross growth efficiency determined either in the field or in laboratory experiments. From the existing literature, we synthesized all data that we could find on dinoflagellates. Some sources might be missing but none were purposefully ignored. We did not include autotrophic dinoflagellates in the database, but mixotrophic organisms may have been included. This is due to the large uncertainty about which taxa are mixotrophic, heterotrophic or symbiont bearing. Field data on microzooplankton grazing are mostly comprised of grazing rate using the dilution technique with a 24h incubation period. Laboratory grazing and growth data are focused on pelagic ciliates and heterotrophic dinoflagellates. The experiment measured grazing or growth as a function of prey concentration or at saturating prey concentration (maximal grazing rate). When considering every single data point available (each measured rate for a defined predator-prey pair and a certain prey concentration) there is a total of 801 data points for the dinoflagellates, counting experiments that measured growth and grazing simultaneously as 1 data point.
    Keywords: 00DEQ029; ASC-1992; ASC-1993; ASC-1995; Atlantic, Vineyard Sound; Basin Scale Analysis, Synthesis and Integration; Bucket, plastic; Carbon per cell; CCMP1834; Cell biovolume; Dinoflagellata, cell biovolume; Dinoflagellata equivalent spherical diameter; East China Sea; Equivalent spherical diameter; EURO-BASIN; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; Event label; EXP; Experiment; FEEDEXP_2005; FEEDEXP_DINO_2000; FEEDEXP_DINO_2005; Geum_Estuary; Geum, Korea, Asia; Golf of Mexico; GPSMK0209; Grazing rate as carbon per individual; Gross growth efficiency; Gwangyang_offshore; GWS_BUESUM_1993; GYRE1994_GM; HARIMA_GD; HTMS0402; IESHIMA_GD; Inner Oslofjord; Kattegat; Kattegat_PNET; Latitude of event; Longitude of event; LpSIO95; MASAN_BAY_2003; MASAN_BAY_2004; MASAN_BAY_2005; Net; NET; OSLOFJORD_DL_1994; P_piscicida_FEEDEXP; Pacific Ocean; PDHMS0206; PLA; Plankton net; PMCJH99; Port Aransas, Aransas ship channel; Prey/Predator, carbon per cell ratio; Prey/Predator, cell biovolume ratio; Prey/Predator, equivalent spherical diameter ratio; PUGET_SOUND_2005; Puget Sound, Salish Sea; Reference/source; Scripps_P_Fragilidium; Scripps_P_Proto; Seto Inland Sea; Taxon/taxa; TISO_NCM; TOKYO_BAY_GD; Tokyo Bay; Treatment: temperature; Uniform resource locator/link to reference; VS_MS_1993; Wadden Sea, North Sea, Germany; Water sample; WB; WS
    Type: Dataset
    Format: text/tab-separated-values, 2584 data points
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    DATA PANGAEA
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