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23 results for “Eocene-Oligocene”
Plankton and benthic foraminiferal dataset for the study of the Eocene-Oligocene transition
<p>The Eocene–Oligocene transition (EOT) was the crucial turning point when Earth's climate shifted to its current cool state. Understanding how life responded to this "warmhouse-to-icehouse" shift was limited by the absence of high-resolution fossil data. Here, we use a novel AI algorithm to construct a 28-myr-long species richness history of foraminifera with ~26,000-year resolution. A significant richness decline occurred during the EOT, eliminating 74% of species. Planktonic and larger benthic foraminiferal extinctions are associated with rapid cooling, sea-level fall, and positive carbon isotopic excursion. However, small benthic foraminifera in deep oceans experienced a two-phase biocrisis coinciding with changes in food supply and volcanic activity. These findings reveal complicated, ecologically differentiated environment-life processes and the need to reconsider other major bioevents in deep time.</p>
Data from: Evolution of dispersal, habit, and pollination in Africa pushed Apocynaceae diversification after the Eocene-Oligocene climate transition
<p>Apocynaceae (the dogbane and milkweed family) is one of the ten largest flowering plant families, with approximately 5,350 species and diverse morphology and ecology, ranging from large trees and lianas that are emblematic of tropical rainforests, to herbs in temperate grasslands, to succulents in dry, open landscapes, and to vines in a wide variety of habitats. Despite a specialized and conservative basic floral architecture, Apocynaceae are hyperdiverse in flower size, corolla shape, and especially derived floral morphological features. These are mainly associated with the development of corolline and/or staminal coronas and a spectrum of integration of floral structures culminating with the formation of a gynostegium and pollinaria—specialized pollen dispersal units. To date, no detailed analysis has been conducted to estimate the origin and diversification of this lineage in space and time. Here, we use the most comprehensive time-calibrated phylogeny of Apocynaceae, which includes approximately 20% of the species covering all major lineages, and information on species number and distributions obtained from the most up-to-date monograph of the family to investigate the biogeographical history of the lineage and its diversification dynamics. South America, Africa, and Southeast Asia (potentially including Oceania), were recovered as the most likely ancestral area of extant Apocynaceae diversity; this tropical climatic belt in the equatorial region retained the oldest extant lineages and these three tropical regions likely represent museums of the family. Africa was confirmed as the cradle of pollinia-bearing lineages and the main source of Apocynaceae intercontinental dispersals. We detected 12 shifts toward accelerated species diversification, of which 11 were in the APSA clade (apocynoids, Periplocoideae, Secamonoideae, and Asclepiadoideae), eight of these in the pollinia-bearing lineages and six within Asclepiadoideae. Wind-dispersed comose seeds, climbing growth form, and pollinia appeared sequentially within the APSA clade and probably work synergistically in the occupation of drier and cooler habitats. Overall, we hypothesize that temporal patterns in diversification of Apocynaceae was mainly shaped by a sequence of morphological innovations that conferred higher capacity to disperse and establish in seasonal, unstable, and open habitats, which have expanded since the Eocene-Oligocene climate transition.</p>
Figure 11 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 11. Size (length of dentaries, mm) of lizard groups in the late Eocene and early Oligocene of Europe.
Figure 12 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 12. Trophic diversity and relative abundance for late Eocene and early Oligocene lizard faunas in Europe. Carnivorous = vertebrate-eater.
Figure 8 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 8. Necrosaurus sp., complete frontal, IRSNB R 249, previously BOU-AR-42-RS. 8a, dorsal view; 8b, ventral view.
Figure 6 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 6. Dopasia roqueprunensis, incomplete parietal, IRSNB R 247, previously BOU-AR-38-RS. 6a, dorsal view; 6b, ventral view.
Figure 5 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 5. Dopasia roqueprunensis, nearly complete left dentary, IRSNB R 246, previously BOU-AR-26-RS. 5a, lateral view; 5b, medial view.
Figure 1. Lacerta s.l in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 1. Lacerta s.l. filholi, nearly complete left dentary, IRSNB R242, previously BOU-AR-27-RS. 1a, lateral view; 1b, medial view.
Figure 3 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 3. Scincoidea undetermined incomplete left dentary, lacking its anterior part, IRSNB R 244, previously BOU-AR-37-RS. 3a, lateral view; 3b, medial view.
Figure 10 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 10. Diversity and extinction of lizard groups in the late Eocene and early Oligocene of Europe.
Plankton and benthic foraminiferal dataset for the study of the Eocene-Oligocene transition
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Data from: Evolution of dispersal, habit, and pollination in Africa pushed Apocynaceae diversification after the Eocene-Oligocene climate transition
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Supporting data for: Evolutionary drivers, morphological evolution and diversity dynamics of a surviving mammal clade: cainotherioids at the Eocene-Oligocene transition
<p><span><span><span><span><span><span><span><span><span><span><span>The Eocene-Oligocene transition (EOT) represents a period of global environmental changes particularly marked in Europe and coincides with a dramatic biotic turnover. Here, using an exceptional fossil preservation, we document and analyse the diversity dynamics of a mammal clade, Cainotherioidea (Artiodactyla), that survived the EOT and radiated rapidly immediately after. We infer their diversification history from Quercy Konzentrat-Lagerstätte (South-West France) at the species level using Bayesian birth-death models. We show that cainotherioid diversity fluctuated through time, with extinction events at the EOT and in the late Oligocene, and a major speciation burst in the early Oligocene. The latter is in line with our finding that cainotherioids had a high morphological adaptability following environmental changes throughout the EOT, which likely played a key role in the survival and evolutionary success of this clade in the aftermath. Speciation is positively associated with temperature and continental fragmentation in a time-continuous way, while extinction seems to synchronize with environmental change in a punctuated way. Within-clade interactions negatively affected the cainotherioid diversification, while inter-clade competition might explain their final decline during the late Oligocene. Our results provide a detailed dynamic picture of the evolutionary history of a mammal clade in a context of global change.</span></span></span></span></span></span></span></span></span></span></span></p>
Figure 9 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 9. Necrosaurus sp., osteoderm, IRSNB R 250, previously BOU-AR-28-RS, dorsal view.
Figure 7 in An assemblage of early Oligocene lizards (Squamata) from the locality of Boutersem (Belgium), with comments on the Eocene-Oligocene transition
Figure 7. Necrosaurus sp., fragment of maxilla, IRSNB R 248, previously BOU-AR-33-RS, medial view.
Model data archive for a model-data intercomparison of the Eocene-Oligocene transition
<p>This data package contains data used for an model-data intercomparison originally<br> published in:</p> <p>D. K. Hutchinson, H. K. Coxall, D. J. Lunt, M. Steinthorsdottir, A. M. de Boer, M. Baatsen, A. von der Heydt, M. Huber, A. T. Kennedy-Asser, L. Kunzmann, J.-B. Ladant, C. H. Lear, K. Moraweck, P. N. Pearson, E. Piga, M. J. Pound, U. Salzmann, H. D. Scher, W. P. Sijp, K. K. Śliwińska, P. A. Wilson, and Z. Zhang, 2021: <strong>The Eocene-Oligocene transition: a review of marine and terrestrial proxy data, models and model-data comparisons</strong>, Climate of the Past, 17, 269-315.<br> <a href="https://doi.org/10.5194/cp-17-269-2021">https://doi.org/10.5194/cp-17-269-2021</a></p> <p>These data are also used in a further model-data intercomparison of Antarctic temperatures:</p> <p>Emily Tibbett, Natalie J Burls, David K. Hutchinson, Sarah J Feakins, (2023), <strong>Proxy-Model Comparison for the Eocene-Oligocene Transition in Southern High Latitudes, Paleoceanography and Paleocliamtology</strong>, In Review. Pre-print avaiable from:<br> <a href="https://www.authorea.com/doi/full/10.1002/essoar.10511735.2">https://www.authorea.com/doi/full/10.1002/essoar.10511735.2</a></p> <p>The package contains surface air temperature and sea surface temperature from an ensemble of model simulations of the Eocene-Oligocene transition. These data are provided at annual and monthly frequency. They are also provided on the original model grid, and an interpolated common grid used for the intercomparison. (The common grid is based on the HadCM3BL model grid.) All data are provided in NETCDF format with self-describing variable names.</p> <p>The name and explanation of the interpolated data files are contained in:<br> <strong>table_of_experiments.xlsx</strong></p> <p>Please read that spreadsheet to interpret the filenames, and see <strong>Table 2 (p291)</strong> of Hutchinson et al (2021) for experiment descriptions.</p> <p>Please also be mindful to cite the original authors of the simulations when using these data, whose work made this dataset possible. The appropriate citations are listed below:</p> <p>Reference DOI link <br> <strong>Baatsen et al (2020)</strong> <a href="https://doi.org/10.5194/cp-16-2573-2020">https://doi.org/10.5194/cp-16-2573-2020 </a> <br> <strong>Goldner et al (2014)</strong> <a href="https://doi.org/10.1038/nature13597">https://doi.org/10.1038/nature13597</a> <br> <strong>Ladant et al (2014a,b)</strong> <a href="https://doi.org/10.5194/cp-10-1957-2014">https://doi.org/10.5194/cp-10-1957-2014</a> <a href="https://doi.org/10.1002/2013PA002593 ">https://doi.org/10.1002/2013PA002593 </a><br> <strong>Hutchinson et al (2018, 2019) </strong><a href="https://doi.org/10.5194/cp-14-789-2018">https://doi.org/10.5194/cp-14-789-2018</a> <a href="https://doi.org/10.1038/s41467-019-11828-z">https://doi.org/10.1038/s41467-019-11828-z</a> <br> <strong>Kennedy et al (2015)</strong> <a href="https://doi.org/10.1098/rsta.2014.0419">https://doi.org/10.1098/rsta.2014.0419</a> <br> <strong>Zhang et al (2012, 2014)</strong> <a href="https://doi.org/10.5194/gmd-5-523-2012">https://doi.org/10.5194/gmd-5-523-2012</a> <a href="https://doi.org/10.1038/nature13705">https://doi.org/10.1038/nature13705</a> <br> <strong>Sijp et al (2009)</strong> <a href="https://doi.org/10.1175/2009JCLI3003.1">https://doi.org/10.1175/2009JCLI3003.1</a></p>
Supporting data for: Evolutionary drivers, morphological evolution and diversity dynamics of a surviving mammal clade: cainotherioids at the Eocene-Oligocene transition
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Data from: Explosion of goby fish diversity at the Eocene-Oligocene transition
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No state change in pelagic fish production and biodiversity during the Eocene-Oligocene Transition
The Eocene-Oligocene (E/O) boundary ~33.9 million years ago, has been described as a state change in the Earth system marked by the permanent glaciation of Antarctica and a proposed increase in oceanic productivity. Here we quantified the response of fish production and biodiversity to this event using microfossil fish teeth (ichthyoliths) in seven deep-sea sediment cores from around the world. Ichthyolith accumulation rate (a proxy for fish biomass production) shows no synchronous trends across the E/O. Ichthyolith accumulation in the Southern Ocean and Pacific Gyre sites is an order of magnitude lower than the equatorial and Atlantic sites, demonstrating that the Southern Ocean was not a highly productive ecosystem for fish before or after the E/O. Further, tooth morphotype diversity and assemblage composition remained stable across the interval, indicating little change in the biodiversity or ecological role of open ocean fish. While the E/O boundary was a major global climate change event, its impact on pelagic fish was relatively muted. Our results support recent findings of whale and krill diversification which suggest that the pelagic ecosystem restructuring commonly attributed to the E/O transition likely occurred much later, in the late Oligocene or Miocene.
No state change in pelagic fish production and biodiversity during the Eocene-Oligocene Transition
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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)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
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.