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10 results for “Great Ordovician Biodiversification”
Global factors constrain body size trends across the Great Ordovician Biodiversification Event at a regional scale: a case study from the Arbuckle Mountains of Oklahoma
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Did hard substrate taxa diversify prior to the Great Ordovician Biodiversification Event?
<p>The Great Ordovician Biodiversification Event (GOBE) refers to one of the greatest increases in biodiversity during the Phanerozoic. Recent studies have shown that this taxonomic increase can be attributed to elevated origination rates around the Dapingian-Darriwilian boundary in the Middle Ordovician, while extinction rates stayed relatively constant throughout the Ordovician. Even though this global pattern of origination and extinction appears similar across diverse groups and geographic areas, earlier studies suggested that hard substrate taxa may have diversified prior to the GOBE, during the Early Ordovician. Here, we quantify Ordovician diversification dynamics of hard substrate taxa while simultaneously accounting for temporally varying sampling probabilities. Diversification rates of hard substrate taxa, both as a whole and when analysed as separate groups, appear to be very similar to those of free-living benthic taxa. The observation that the diversification dynamics of many different taxonomic and ecological groups show the same temporal pattern, suggests a common-cause to Ordovician diversification dynamics.</p>
Supplementary Data for "Synchronous asteroid breakup paused the Great Ordovician Biodiversification Event"
<p>Supplementary Data includes a detailed comparison of the YW2 borehole with the well-studied Puxi River section, the U-Pb isotopic data of the bentonite, and coupled carbon isotope data of the YW2 borehole. </p>
Dataset for Globally synchronous meteorite rain paused the Great Ordovician Biodiversification Event
<p>Supporting information includes a detailed comparison of the stratigraphy of the YW2 borehole with the well-studied Puxi River section, the U-Pb isotopic data from the bentonite, and coupled carbon isotope data from the YW2 borehole.</p>
Did hard substrate taxa diversify prior to the Great Ordovician Biodiversification Event?
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Data from: Estimating dispersal and evolutionary dynamics in diploporan blastozoans (Echinodermata) across the Great Ordovician Biodiversification Event
<p><b>Echinoderms make up a substantial component of Ordovician marine invertebrates, yet their speciation and dispersal history as inferred within a rigorous phylogenetic and statistical framework is lacking. We use Biogeographic Stochastic Mapping (BSM; implemented in the R package BioGeoBEARS) to infer ancestral area relationships and the number and type of dispersal events through the Ordovician for diploporan blastozoans and related species. The BSM analysis was divided into three time slices to analyze how dispersal paths changed before and during the Great Ordovician Biodiversification Event (GOBE) and within the Late Ordovician mass extinction intervals. The best-fit biogeographical model incorporated jump dispersal, indicating this was an important speciation strategy. Reconstructed areas within the phylogeny indicate the first diploporan blastozoans likely originated within Baltica or Gondwana. Dispersal, jump dispersal, and sympatry dominated the BSM inference through the Ordovician, while dispersal paths varied in time. Long-distance dispersal events in the Early Ordovician indicate distance was not a significant predictor of dispersal, whereas increased dispersal events between Baltica and Laurentia are apparent during the GOBE, indicating these areas were important to blastozoan speciation. During the Late Ordovician, there is an increase in dispersal events among all paleocontinents. The drivers of dispersal are attributed to oceanic and epicontinental currents. Speciation events plotted against geochemical data indicate that blastozoans may not have responded to climate cooling events and other geochemical perturbations, but additional data will continue to shed light into the drivers of early Paleozoic blastozoan speciation and dispersal patterns.</b></p>
Supplemental information for: An early burst in brachiopod evolution corresponding with significant climatic shifts during the great Ordovician biodiversification event
<p>We employ modified tip-dating methods to date divergence times within the Strophomenoidea, one of the most abundant and species-rich brachiopod clades to radiate during the Great Ordovician Biodiversification Event (GOBE), to determine if significant environmental changes at this time correlate with the diversification of the clade. Models using origination, extinction and sampling rates to estimate prior probabilities of divergence times strongly support both high rates of anatomical change per million-years and rapid divergences shortly before the clade first appears in the fossil record. These divergence times indicate much higher rates of cladogenesis than typical of brachiopods during this interval. The correspondence of high speciation rates and high anatomical disparity suggests punctuated (speciational) change drove the high frequencies of early anatomical change, which in turn suggests increased ecological opportunities rather than shifting developmental constraints account for high rates of anatomical change. The pulse of rapid evolution began coincident with cooling temperatures, the start of major oscillations in sea level, and increased levels of atmospheric oxygen. Our results suggest that these factors permitted major geographic and ecological expansion of strophomenoids with intervals of geographic isolation, resulting in elevated speciation rates and corresponding elevated frequencies of punctuated change.</p>
Data from: Estimating dispersal and evolutionary dynamics in diploporan blastozoans (Echinodermata) across the Great Ordovician Biodiversification Event
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Supplemental information for: An early burst in brachiopod evolution corresponding with significant climatic shifts during the great Ordovician biodiversification event
Open the record for dataset details and reuse information.
Data from: Dissecting the paleocontinental and paleoenvironmental dynamics of the Great Ordovician Biodiversification
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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DANDI Archive for NWB datasets
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International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.