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  • 1
    Electronic Resource
    Electronic Resource
    Prey size selection, feeding rates and growth dynamics of heterotrophic dinoflagellates with special emphasis on Gyrodinium spirale (1992)
    Springer
    Marine biology 114 (1992), S. 327-334 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The relationship between size and growth rate in heterotrophic dinoflagellates (collected from the Kattegat, Denmark during 1989 and 1990) was studied. In addition, prey size selection, feeding rates and growth dynamics were studied for the naked heterotrophic dinoflagellate Gyrodinium spirale Bergh. Heterotrophic dinoflagellates have growth rates which are approximately three times lower than that of their potential competitors, the ciliates. G. spirale requires a relatively high prey concentration in order to grow. Ingestion rate at the maintenance level is about half of that of maximum ingestion rate. Consequently, yield is lower than typically found for planktonic protozoa. When exposed to low prey concentrations, the dinoflagellate is able to reduce its metabolism and thus prolong survival. The optimum prey particle size for G. spirale, which feeds by direct engulfment, corresponds to its own size. The ability to ingest relatively large prey may explain why these organisms are competitive in nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00349535
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Phagotrophic Mechanisms and Prey Selection in Free-living Dinoflagellates (1999)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 46 (1999), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Three types of feeding mechanisms are known in dinoflagellates: pallium feeding, tube feeding, and direct engulfment. Pallium feeding has only been described for heterotrophic thecate species (Protoperidinium, Diplopsalis group). Tube feeding is commonly found among both naked and thecate species of mixotrophic and heterotrophic dinoflagellates (e.g. Amphidinium, Dinophysis, Gyrodinium, Peridiniopsis). Direct engulfment is mainly found among naked species (e.g. Gymnodinium, Gyrodinium, Noctiluca): recently, however, some thecate species have been shown to use this feeding mechanism as well. Feeding behavior in dinoflagellates involves several steps prior to actual ingestion, including precapture, capture, and prey manipulation. As feeding mechanisms allow the ingestion of relatively large prey or parts thereof, dinoflagellates are regarded as raptorial feeders. While prey size plays an important role in the ability of dinoflagellates to ingest food, this alone cannot explain observed prey preferences. Some dinoflagellate species can be very selective in their choice of prey, while others show a remarkable versatility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1999.tb04617.x
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    Paper (German National Licenses)
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  • 3
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    Seawater carbonate chemistry, cell numbers and growth rate during experiments with dinoflagellates, 2007 (2007)
    PANGAEA
    In:  Supplement to: Hansen, Per Juel; Lundholm, Nina; Rost, Björn (2007): Growth limitation in marine red-tide dinoflagellates: effects of pH versus inorganic carbon availability. Marine Ecology Progress Series, 334, 63-71, https://doi.org/10.3354/meps334063
    Details
    Publication Date: 2023-07-07
    Description: The effects of dissolved inorganic carbon (DIC) on the growth of 3 red-tide dinoflagellates (Ceratium lineatum, Heterocapsa triquetra and Prorocentrum minimum) were studied at pH 8.0 and at higher pH levels, depending upon the pH tolerance of the individual species. The higher pH levels chosen for experiments were 8.55 for C. lineatum and 9.2 for the other 2 species. At pH 8.0, which approximates the pH found in the open sea, the maximum growth in all species was maintained until the total DIC concentration was reduced below ~0.4 and 0.2 mM for C. lineatum and the other 2 species, respectively. Growth compensation points (concentration of inorganic carbon needed for maintenance of cells) were reached at ~0.18 and 0.05 mM DIC for C. lineatum and the other 2 species, respectively. At higher pH levels, maximum growth rates were lower compared to growth at pH 8, even at very high DIC concentrations, indicating a direct pH effect on growth. Moreover, the concentration of bio-available inorganic carbon (CO2 + HCO3-) required for maintenance as well as the half-saturation constants were increased considerably at high pH compared to pH 8.0. Experiments with pH-drift were carried out at initial concentrations of 2.4 and 1.2 mM DIC to test whether pH or DIC was the main limiting factor at a natural range of DIC. Independent of the initial DIC concentrations, growth rates were similar in both incubations until pH had increased considerably. The results of this study demonstrated that growth of the 3 species was mainly limited by pH, while inorganic carbon limitation played a minor role only at very high pH levels and low initial DIC concentrations.
    Keywords: Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria (〈20 L); Ceratium lineatum; Chromista; EPOCA; EUR-OCEANS; European network of excellence for Ocean Ecosystems Analysis; European Project on Ocean Acidification; EXP; Experiment; Growth/Morphology; Hansen_etal_07/F1; Hansen_etal_07/F2; Laboratory experiment; Laboratory strains; Myzozoa; Not applicable; OA-ICC; Ocean Acidification International Coordination Centre; Pelagos; Phytoplankton; Prorocentrum minimum; Single species
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 4
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    Feeding, growth and grazing rates of Favella ehrenbergii determined experimentally (2014)
    PANGAEA
    Details
    Publication Date: 2024-03-11
    Keywords: Abundance per volume; Carbon per cell; Cell, length; Cell, width; Cell biovolume; Ciliates, cell biovolume; Clearance rate per individual; Event label; EXP; Experiment; F_ehrenbergii_FEEDEXP_1; Grazing rate per individual; Taxon/taxa; Treatment: temperature; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 126 data points
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  • 5
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    Feeding, growth and grazing rates of heterotrophic dinoflagellates with special emphasis on Gyrodinium spirale determined experimentally (2013)
    PANGAEA
    Details
    Publication Date: 2024-03-11
    Keywords: Abundance per volume; Biomass as carbon per volume; Carbon per cell; Cell biovolume; Clearance rate per individual; Dinoflagellata, cell biovolume; Dinoflagellata, growth rate; Dinoflagellates; Equivalent spherical diameter; Event label; Feeding mode; Grazing rate per individual; Kattegat; Kattegat_PNET; Latitude of event; Longitude of event; Net; NET; Taxon/taxa; Treatment: light:dark cycle; Treatment: light intensity; Treatment: temperature; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 623 data points
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  • 6
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    Growth rate of Zooplankton determined experimentally (2014)
    PANGAEA
    Details
    Publication Date: 2024-01-26
    Keywords: Biomass as carbon per individual; EXP; Experiment; Growth rate as carbon per carbon biomass; Growth rate as carbon per individual; Taxon/taxa; Treatment: temperature; Uniform resource locator/link to reference; Zooplankton_GROWTHEXP
    Type: Dataset
    Format: text/tab-separated-values, 244 data points
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  • 7
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    Maximum ingestion and maximum clearance rate of Zooplankton determined experimentally (2014)
    PANGAEA
    Details
    Publication Date: 2024-01-26
    Keywords: Biomass as carbon per individual; Clearance rate per individual; EXP; Experiment; Ingestion rate of carbon per individual; Taxon/taxa; Treatment: temperature; Uniform resource locator/link to reference; Zooplankton_FEEDEXP-2
    Type: Dataset
    Format: text/tab-separated-values, 232 data points
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  • 8
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    Maximum ingestion and maximum clearance rate of Fragilidium subglobosum determined experimentally (2014)
    PANGAEA
    Details
    Publication Date: 2024-01-26
    Keywords: Biomass as carbon per individual; Clearance rate per individual; F_subglobosum_FEEDEXP; Ingestion rate of carbon per individual; Kattegat; Net; NET; Taxon/taxa; Treatment: temperature; Uniform resource locator/link to reference
    Type: Dataset
    Format: text/tab-separated-values, 6 data points
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  • 9
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    Effect of acidification on an Arctic phytoplankton community from Disko Bay, West Greenland (2015)
    PANGAEA
    In:  Supplement to: Thoisen, Christina; Riisgaard, Karen; Lundholm, Nina; Nielsen, Torkel Gissel; Hansen, Per Juel (2015): Effect of acidification on an Arctic phytoplankton community from Disko Bay, West Greenland. Marine Ecology Progress Series, 520, 21-34, https://doi.org/10.3354/meps11123
    Details
    Publication Date: 2024-03-15
    Description: Long-term measurements (i.e. months) of in situ pH have not previously been reported from the Arctic; this study shows fluctuations between pH 7.5 and 8.3 during the spring bloom 2012 in a coastal area of Disko Bay, West Greenland. The effect of acidification on phytoplankton from this area was studied at both the community and species level in experimental pH treatments within (pH 8.0, 7.7 and 7.4) and outside (pH 7.1) in situ pH. The growth rate of the phytoplankton community decreased during the experimental acidification from 0.50 ± 0.01/day (SD) at pH 8.0 to 0.22 ± 0.01/day at pH 7.1. Nevertheless, the response to acidification was species-specific and divided into 4 categories: I, least affected; II, affected only at pH 7.1; III, gradually affected and IV, highly affected. In addition, the colony size and chain length of selected species were affected by the acidification. Our findings show that coastal phytoplankton from Disko Bay is naturally exposed to pH fluctuations exceeding the experimental pH range used in most ocean acidification studies. We emphasize that studies on ocean acidification should include in situ pH before assumptions on the effect of acidification on marine organisms can be made.
    Keywords: Alkalinity, total; Aragonite saturation state; Arctic; Bicarbonate ion; Bicarbonate ion, standard deviation; Bottles or small containers/Aquaria (〈20 L); Calcite saturation state; Calculated using CO2SYS; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Carbonate ion; Carbonate ion, standard deviation; Carbonate system computation flag; Carbon dioxide; Carbon dioxide, standard deviation; Chaetoceros sp.; Coulometric titration; Diameter; Entire community; EXP; Experiment; Figure; Frequency; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth/Morphology; Growth rate; Growth rate, standard deviation; Laboratory experiment; Navicula granii; Navicula sp.; Navicula vanhoeffenii; OA-ICC; Ocean Acidification International Coordination Centre; Open ocean; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); Pelagos; Percentage; Percentage, standard deviation; pH; pH, standard deviation; Phaeocystis pouchetii; Polar; Potentiometric; Pyramimonas sp.; Qeqertarsuaq; Salinity; Species; Temperature, water; Thalassiosira sp.; Thalassiosira spp.; Time in days; Treatment
    Type: Dataset
    Format: text/tab-separated-values, 2880 data points
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  • 10
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    Seawater carbonate chemistry and physiology of plastidic ciliate Mesodinium rubrum and its cryptophyte prey (2024)
    PANGAEA
    Details
    Publication Date: 2024-03-15
    Description: We studied the separate and interactive effects of pH and DIC levels on the plastidic ciliate Mesodinium rubrum, which is known to form red tides in coastal waters worldwide. Also, we tested the effects on their prey, which typically are cryptophytes belonging to the Teleaulax/Plagioslemis/Geminigera species complex. These cryptophytes not only serve as food for the ciliate, but also as a supplier of chloroplasts and prey nuclei. We exposed M. rubrum and the two cryptophyte species, T. acuta, T. amphioxeia to different pH (6.8 – 8) and DIC levels (∼ 6.5 – 26 mg C L-1) and assessed their growth and photosynthetic rates, and cellular chlorophyll a and elemental contents.
    Keywords: Alkalinity, total; Aragonite saturation state; Bicarbonate ion; Calcite saturation state; Calculated using seacarb after Nisumaa et al. (2010); Carbon, inorganic, dissolved; Carbon/Nitrogen ratio; Carbon/Phosphorus ratio; Carbonate ion; Carbonate system computation flag; Carbon dioxide; Carbon per cell; Chlorophyll a per cell; Fugacity of carbon dioxide (water) at sea surface temperature (wet air); Growth rate; OA-ICC; Ocean Acidification International Coordination Centre; Partial pressure of carbon dioxide (water) at sea surface temperature (wet air); pH; Photosynthetic carbon fixation rate, per cell; Salinity; Species, unique identification; Species, unique identification (Semantic URI); Species, unique identification (URI); Temperature, water; Treatment; Type of study
    Type: Dataset
    Format: text/tab-separated-values, 5074 data points
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