Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
6
datasets available to search
ShareScore release 0.9.0
Dataset results
6 results for “continental disjunctions”
Data from: Ancient vicariance and climate-driven extinction explain continental-wide disjunctions in Africa: the case of the Rand Flora genus Canarina (Campanulaceae)
Transoceanic distributions have attracted the interest of scientists for centuries. Less attention has been paid to the evolutionary origins of 'continent-wide' disjunctions, in which related taxa are distributed across isolated regions within the same continent. A prime example is the 'Rand Flora' pattern, which shows sister taxa disjunctly distributed in the continental margins of Africa. Here, we explore the evolutionary origins of this pattern using the genus Canarina, with three species: C. canariensis, associated with the Canarian laurisilva, and C. eminii and C. abyssinica, endemic to the Afromontane region in East Africa, as case study. We infer phylogenetic relationships, divergence times and the history of migration events within Canarina using Bayesian inference on a large sample of chloroplast and nuclear sequences. Ecological niche modelling was employed to infer the climatic niche of Canarina through time. Dating was performed with a novel nested approach to solve the problem of using deep time calibration points within a molecular dataset comprising both above-species and population-level sampling. Results show C. abyssinica as sister to a clade formed by disjunct C. eminii and C. canariensis. Miocene divergences were inferred among species, whereas infraspecific divergences fell within the Pleistocene–Holocene periods. Although C. eminii and C. canariensis showed a strong genetic geographic structure, among-population divergences were older in the former than in the latter. Our results suggest that Canarina originated in East Africa and later migrated across North Africa, with vicariance and aridification-driven extinction explaining the 7000 km/7 million year divergence between the Canarian and East African endemics.
Data from: Phylogenomics and continental biogeographic disjunctions – insight from the Australian starflowers (Calytrix: Myrtaceae)
<p><span><span><span><span><span><span><span><span><span><span><span><b>PREMISE OF THE STUDY:</b> Continental-scale disjunctions and associated drivers is a core research interest in biogeographic studies. Here, we selected a species-rich Australian plant genus (<i>Calytrix</i>;<i> </i>Myrtaceae) as a case study<i> </i>to investigate these patterns in an Australian context. The endemic Australian starflower genus has a disjunct distribution across the mesic fringes of the continent and is absent from the arid centre.</span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span><b>METHODS: </b>We used high-throughput sequencing to generate unprecedented resolution and near complete species-level nuclear and plastid phylogenies for <i>Calytrix.</i> BioGeoBEARS and biogeographic stochastic mapping (BSM) were used to infer ancestral areas, the relative contributions of vicariance and dispersal events, and directionality of dispersal.</span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span><b>KEY RESULTS: </b>Present-day disjunctions in <i>Calytrix </i>are explained by a combination of scenarios: (1) retreat of multiple lineages from the continental centre to the more mesic fringes as Australia became progressively more arid, with subsequent extinction in the centre, and also (2) origination of ancestral lineages in southwestern Australia (SWA) for species-rich clades. The SWA biodiversity hotspot is a major diversification centre and the most common source area of dispersals, with multiple lineages originating in SWA and subsequently spreading to the adjacent arid Eremaean region. </span></span></span></span></span></span></span></span></span></span></span></p> <p><span><span><span><span><span><span><span><span><span><span><span><b>CONCLUSIONS: </b>Our results suggest major extinction as a result of cooling and drying of the Australian continent in the Eocene–Miocene shaped the present-day biogeography of <i>Calytrix</i>.<i> </i>We hypothesise that this peripheral vicariance pattern, which is similar to the African Rand flora, may explain the disjunctions of many other Australian plant groups. Further studies with densely sampled phylogenies are required to test this hypothesis.</span></span></span></span></span></span></span></span></span></span></span></p>
Data from: Ancient vicariance and climate-driven extinction explain continental-wide disjunctions in Africa: the case of the Rand Flora genus Canarina (Campanulaceae)
Open the record for dataset details and reuse information.
Data from: Phylogenomics and continental biogeographic disjunctions – insight from the Australian starflowers (Calytrix: Myrtaceae)
Open the record for dataset details and reuse information.
Figure 1 from: Dorr LJ, Wurdack KJ (2018) A new disjunct species of Eriolaena (Malvaceae, Dombeyoideae) from Continental Africa. PhytoKeys 111: 11-16. https://doi.org/10.3897/phytokeys.111.29303
Figure 1 Eriolaenarulkensii. A Habit B, C Flower buds with 3 epicalyx bracts each D Immature flower with petals (yellow), sepals (green) and scar of one dehisced epicalyx bract E Detail of sepal F Flower at anthesis showing petals, anthers, staminodes and gynoecium G Detail of petal H Detail of androecium showing androecial tube, anthers in fascicles and staminodes I Gynoecium and base of two staminodes J Immature capsule showing scars from dehisced calyx lobes and epicalyx bracts. (Source: A.J.H. Rulkens 1, US).
Figure 2 from: Dorr LJ, Wurdack KJ (2018) A new disjunct species of Eriolaena (Malvaceae, Dombeyoideae) from Continental Africa. PhytoKeys 111: 11-16. https://doi.org/10.3897/phytokeys.111.29303
Figure 2 Eriolaenarulkensii. A Trunk and bark B Infructescence C Immature capsules with prominent ridges D Habit (shrub in centre with yellow flowers) E Flower (foreground) with stamens in fascicles of 2(3), each alternating with a ligulate staminode, and a simple style with 10 stigmas; flower buds (background) with 3 epicalyx lobes subtending each calyx F Capsules (mature) with loculicidally dehiscent mericarp-like structures. Photographs: A.J.H. Rulkens.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
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.