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.
81
datasets available to search
ShareScore release 0.9.0
Dataset results
81 results for “Nyssa”
Nyssa sylvatica (Cornaceae) - inflorescence - whole - male
Image of Nyssa sylvatica (Cornaceae) - inflorescence - whole - male
Nyssa sylvatica (Cornaceae) - inflorescence - lateral view of flower
Image of Nyssa sylvatica (Cornaceae) - inflorescence - lateral view of flower
Nyssa sylvatica (Cornaceae) - inflorescence - whole - male
Image of Nyssa sylvatica (Cornaceae) - inflorescence - whole - male
Nyssa sylvatica (Cornaceae) - inflorescence - lateral view of flower
Image of Nyssa sylvatica (Cornaceae) - inflorescence - lateral view of flower
Nyssa sylvatica (Cornaceae) - inflorescence - frontal view of flower
Image of Nyssa sylvatica (Cornaceae) - inflorescence - frontal view of flower
Nyssa sylvatica (Cornaceae) - inflorescence - frontal view of flower
Image of Nyssa sylvatica (Cornaceae) - inflorescence - frontal view of flower
Nyssa sylvatica (Cornaceae) - inflorescence - whole - male
Image of Nyssa sylvatica (Cornaceae) - inflorescence - whole - male
Nyssa sylvatica (Cornaceae) - inflorescence - frontal view of flower
Image of Nyssa sylvatica (Cornaceae) - inflorescence - frontal view of flower
Nyssa sylvatica (Cornaceae) - inflorescence - whole - female
Image of Nyssa sylvatica (Cornaceae) - inflorescence - whole - female
Nyssa sylvatica (Cornaceae) - leaf - showing orientation on twig
Image of Nyssa sylvatica (Cornaceae) - leaf - showing orientation on twig
Nyssa sylvatica (Cornaceae) - whole tree (or vine) - general
Image of Nyssa sylvatica (Cornaceae) - whole tree (or vine) - general
Nyssa sylvatica (Cornaceae) - whole tree (or vine) - general
Image of Nyssa sylvatica (Cornaceae) - whole tree (or vine) - general
Nyssa sylvatica (Cornaceae) - whole tree (or vine) - general
Image of Nyssa sylvatica (Cornaceae) - whole tree (or vine) - general
Data from: Resolving relationships and phylogeographic history of the Nyssa sylvatica complex using data from RAD-seq and species distribution modeling
Nyssa sylvatica complex consists of several woody taxa occurring in eastern North America. These taxa were recognized as two or three species including three or four varieties by different authors. Due to high morphological similarities and complexity of morphological variation, classification and delineation of taxa in the group have been difficult and controversial. Here we employ data from RAD-seq to elucidate the genetic structure and phylogenetic relationships within the group. Using the genetic evidence, we evaluate previous classifications and delineate species. We also employ Species Distribution Modeling (SDM) to evaluate impacts of climatic changes on the ranges of the taxa and to gain insights into the relevant refugia in eastern North America. Results from Molecular Variance Analysis (AMOVA), STRUCTURE, phylogenetic analyses using Maximum likelihood, Bayesian Inference, and Splittree methods of RAD-seq data strongly support a two-clade pattern, largely separating samples of N. sylvatica from those of N. biflora-N. ursina mix. Divergence time analysis with BEAST suggests the two clades diverged in the mid Miocene. The ancestor of the present trees of N. sylvatica was suggested to be in the Pliocene and that of N. biflora-N. ursina mix in the end of the Miocene. Results from SDM predicted a smaller range in the southern part of the species present range of each clade during the Last Glacial Maximum (LGM). A northward expansion of the ranges during interglacial period and a northward shift of the ranges in the future under a model of global warming were also predicted. Our results support the recognition of two species in the complex, N. sylvatica and N. biflora, following the phylogenetic species concept. We found no genetic evidence supporting recognitions of intraspecific taxa. However, we propose subsp. ursina and subsp. biflora within N. biflora due to their distinction in habits, distributions, and habitats. Our results further support movements of trees in eastern North America in response to climatic changes. Finally, our study demonstrates that RAD-seq data and a combination of population genomics and SDM are valuable in resolving relationship and biogeographic history of closely related species that are taxonomically difficult.
Data from: Resolving relationships and phylogeographic history of the Nyssa sylvatica complex using data from RAD-seq and species distribution modeling
Open the record for dataset details and reuse information.
Harvard Forest site, station Harvard Forest's Lyford Blocks within the Prospect Hill Tract, study of diameter at breast height of Nyssa sylvatica (black gum) in units of centimeter on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Harvard Forest (HFR) contains diameter at breast height of Nyssa sylvatica (black gum) measurements in centimeter units and were aggregated to a yearly timescale.
Phylogenomics, biogeography, and evolution of morphology and ecological niche of the eastern Asian‐ eastern North American Nyssa (Nyssaceae)
<p><i>Nyssa</i> (Nyssaceae, Cornales) represents a classical example of the well‐known eastern Asian‐eastern North American floristic disjunction. The genus consists of three species in eastern Asia, four species in eastern North America, and one species in Central America. Species of the genus are ecologically important trees in eastern North American and eastern Asian forests. The distribution of living species and a rich fossil record of the genus make it an excellent model for understanding the origin and evolution of the eastern Asian‐eastern North American floristic disjunction. However, despite the small number of species, relationships within the genus have remained unclear and have not been elucidated using a molecular approach. Here we integrate data from 48 nuclear genes, fossils, morphology, and ecological niche to resolve species relationships, elucidate its biogeographic history, and investigate the evolution of morphology and ecological niches, with the goal toward a better understanding of the well‐known EA‐ENA floristic disjunction. Results showed the Central American (CAM) <i>N. talamancana</i> was sister to the remaining species, which were divided among three, rapidly diversified subclades. Estimated divergence times and biogeographic history suggested <i>Nyssa</i> had an ancestral range in Eurasia and western North America in the late Paleocene. The rapid diversification occurred in the early Eocene, followed by multiple dispersals between and within the Erasian and North American continents. The genus experienced two major episodes of extinction in the early Oligocene and end of Neogene, respectively. The Central American <i>N. talamancana</i> represents a relic lineage of the boreotropical flora in the Paleocene/Eocene boundary that once diversified in western North America. The results supported the importance of both the North Atlantic land bridge and the Bering land bridge (BLB) for the Paleogene dispersals of <i>Nyssa</i> and the BLB for the Neogene dispersals and the role of Central America as refugia of the Paleogene flora. The total‐evidence based dated phylogeny suggested that the pattern of macroevolution of <i>Nyssa</i> coincided with paleoclimatic changes. We found a number of evolutionary changes in morphology (including wood anatomy and leaf traits) and ecological niches (precipitation and temperature) between the EA‐ENA disjunct, supporting ecological selection driving trait evolutions following geographic isolation. We also demonstrated challenges in phylogenomic studies of lineages with rapid diversification histories. The concatenation of gene data can lead to inference of strongly supported relationships incongruent with the species tree. However, conflicts in gene genealogies did not seem to impose a strong effect on divergence time dating in our case. Furthermore, we demonstrated that rapid diversification events may not be recovered in divergence time dating analysis using BEAST if critical fossil constraints of the relevant nodes are not available. Our study provides an example of complex bi‐directional exchanges of plants between Eurasia and North America in the Paleogene but "out of Asia" migrations in the Neogene to explain the present disjunct distribution of <i>Nyssa</i> in EA and ENA.<b> </b><b> </b></p>
Nyssa sylvatica (Cornaceae) - bark
Image of Nyssa sylvatica (Cornaceae) - bark
Nyssa sylvatica (Cornaceae) - whole tree (or vine) - winter
Image of Nyssa sylvatica (Cornaceae) - whole tree (or vine) - winter
Nyssa sylvatica (Cornaceae) - bark - of a medium tree or large branch
Image of Nyssa sylvatica (Cornaceae) - bark - of a medium tree or large branch
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.