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  • 1
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    Phytoplankton niches estimated from CPR data in the North Atlantic (2012)
    PANGAEA
    In:  Supplement to: Irwin, Andrew J; Nelles, Andrew M; Finkel, Zoe V (2012): Phytoplankton niches estimated from field data. Limnology and Oceanography, 57(3), 787-797, https://doi.org/10.4319/lo.2012.57.3.0787
    Details
    Publication Date: 2023-01-13
    Description: We combine phytoplankton occurrence data for 119 species from the continuous plankton recorder with climatological environmental variables in the North Atlantic to obtain ecological response functions of each species using the MaxEnt statistical method. These response functions describe how the probability of occurrence of each species changes as a function of environmental conditions and can be reduced to a simple description of phytoplankton realized niches using the mean and standard deviation of each environmental variable, weighted by its response function. Although there was substantial variation in the realized niche among species within groups, the envelope of the realized niches of North Atlantic diatoms and dinoflagellates are mostly separate in niche space.
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 2
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    Species response functions (2012)
    PANGAEA
    Details
    Publication Date: 2023-01-13
    Keywords: Species; Variable; x; y
    Type: Dataset
    Format: text/tab-separated-values, 1646316 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 3
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    Summary of the niche of 119 species of phytoplankton from the CPR data using climatological environmental data (2012)
    PANGAEA
    Details
    Publication Date: 2023-02-12
    Keywords: Group; Number of observations; Parameter; Species
    Type: Dataset
    Format: text/tab-separated-values, 6345 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
    Electronic Resource
    Electronic Resource
    Cellular automaton model of chemical wave propagation on fractals (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3471-3483 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A three-state cellular automaton (CA) model of nucleation and chemical wave propagation on fractal lattices is discussed. In the CA, seeds produce spreading wavefronts of active or transformed sites which mutually annihilate on collision. Many chemical and biological growth processes display this behavior. Pattern formation and growth from isolated seeds and from random initial distributions of seeds are considered. Steady-state behavior for continuous seeding is also discussed. For isolated seeds, surface and volume growth exponents on fractals do not show the simple relation that holds for homogeneous lattices, and lattice topology plays an important dynamical role. For initial seeding, mean-field theory predicts that growth depends on the fractal dimension D (since the minimum path dimension is one). However the fractal gap hierarchy (lacunarity) introduces fluctuation contributions. For continuous seeding entirely new effects arise. On sponge-like fractals oscillators are created; these eventually fill the lattice even at low seeding density. However tree-like fractals cannot support oscillators, and instead exhibit dynamical scaling behavior. For mixed fractals complicated periodic phenomena can arise.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458829
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    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The evolutionary inheritance of elemental stoichiometry in marine phytoplankton (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 425 (2003), S. 291-294 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Phytoplankton is a nineteenth century ecological construct for a biologically diverse group of pelagic photoautotrophs that share common metabolic functions but not evolutionary histories. In contrast to terrestrial plants, a major schism occurred in the evolution of the eukaryotic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01953
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    Paper (German National Licenses)
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  • 6
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    Macroevolutionary trends in silicoflagellate skeletal morphology: the costs and benefits of silicification (2012)
    Paleontological Society
    Details
    Publication Date: 2012-06-01
    Description: The silicoflagellates are a class of enigmatic chrysophytes characterized by netlike skeletons composed of opaline silica. Other major groups of siliceous plankton—the diatoms and radiolarians—exhibit evidence of decreasing size or silicification over the Cenozoic. We investigated trends in the silicoflagellate fossil record by constructing a species-level database of diversity and morphological metrics. This new database reveals a proliferation of silicoflagellate species with spined skeletons along with an increase in the mean number of spines per species over the Cenozoic. Although there is little change in skeleton size or silicification among species with spines, those without spines are larger than species with spines and exhibit a decrease in size toward the present. Increased grazing pressure combined with declining surface silicate availability may have shifted the costs and benefits of silicification, causing divergent responses in skeletal morphology between these different morphological lineages of silicoflagellates over time. We postulate that diminishing Cenozoic surface silicic acid availability may have predisposed large spineless silicoflagellate species to extinction, whereas increased grazing pressure may have contributed to the extinction of all remaining spineless species within the edible size range of grazers.
    Print ISSN: 0094-8373
    Electronic ISSN: 0094-8373
    Topics: Geosciences
    Published by Paleontological Society
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    PAPER CURRENT
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