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  • 2010-2014  (4)
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  • 1
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    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
    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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  • 2
    Publication Date: 2023-01-13
    Keywords: Species; Variable; x; y
    Type: Dataset
    Format: text/tab-separated-values, 1646316 data points
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  • 3
    Publication Date: 2023-02-12
    Keywords: Group; Number of observations; Parameter; Species
    Type: Dataset
    Format: text/tab-separated-values, 6345 data points
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  • 4
    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
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