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.
690
datasets available to search
ShareScore release 0.9.0
Dataset results
690 results for “Geometric morphometrics”
A geometric morphometric approach to identify uncomplete snake vertebrae from raptor bird feeding remains
<p>The Hungarian meadow viper (<em>Vipera ursinii rakosiensis</em>) is an endangered subspecies of <em>Vipera ursinii</em>, which faces high predation pressure, partially due to avian species. To create a systematic method for estimating the measure of predation pressure, we developed a geometric morphometric approach to identify both undamaged and damaged vertebrae of snake species found in Hungarian meadow viper habitats from raptor feeding remains. We used linear discriminant analysis with a reference material of vertebrae from identified snake species as training data. We also tested its efficiency by predicting the identification results of different simulation levels based on vertebra completeness. We practiced this method on vertebrae of unknown species of snakes obtained from nests and pellets of short-toed snake eagles (<em>Circaetus gallicus</em>, n=9), common buzzards (<em>Buteo buteo</em>, n=14) and Montagu’s harriers (<em>Circus pygargus</em>, n=3). The identification approach showed high accuracy, even in the case of missing landmarks to some extent. We identified vertebrae remnants of <em>Natrix natrix</em> (n=172, 83.9%), <em>Coronella austriaca</em> (n=10, 4.9%) and <em>V. u. rakosiensis</em> (n=23, 11.2%). Both, the reptile specialist <em>C. gallicus</em> and<em> </em>the generalist<em> B. buteo</em> proved to be preying on <em>V. u. rakosiensis</em>, while samples of <em>C. pygargus</em> did not contain any snake remains despite of previous observations of <em>V. ursinii</em> predations. Our approach is applicable for other studies and taxa as well, therefore can be a practical tool for classification of incomplete vertebrae, which is otherwise hardly identifiable. Furthermore, it could be applied to help estimate predation pressure on endangered snake species.</p>
Supplementary material from: ZooMS confirms geometric morphometrics species identification of ancient sheep and goat
<p><span>Geometric morphometrics can effectively distinguish isolated third lower molars of present-day sheep and goat, but its applicability to archaeological specimens has yet to be established. Using a modern reference collection of 743 sheep and goats and a 2D-landmark-based geometric morphometric (GMM) protocol, this study aimed to morphometrically identify 109 archaeological specimens, used as case studies, dating from the Late Neolithic to the modern period/era. These morphometric identifications were then compared to molecular identifications via collagen peptide mass fingerprinting, known as Zooarcheology by Mass Spectrometry (ZooMS). ZooMS confirmed the morphometric identifications for 104 specimens, with the five misidentified specimens all morphometrically identified as goat. </span></p> <p><span>Modern sheep and goats have larger teeth and distinct shapes compared to their archaeological counterparts, suggesting strong differences between archaeological and modern specimens potentially linked with recent breed improvement or geographic origin of the specimens. In addition, for both species, </span><span>some of the archaeological dental morphologies do not match with any of our modern references</span><span>.</span></p> <p><span>This study validates the applicability of geometric morphometrics for identifying isolated archaeological sheep and goat teeth. It represents a stepping stone for future, non-destructive, bioarchaeological studies of the two species.</span></p>
Geometric morphometrics as a tool for evaluating Eublastoidea morphological variation
Open the record for dataset details and reuse information.
Taxonomic utility of isolated ankylosaurian dinosaur teeth using traditional and geometric morphometrics with implications for ankylosaur palaeoecology
Open the record for dataset details and reuse information.
Effects of taphonomic deformation on geometric morphometric analysis of fossils: a case study using the dicynodont Diictodon feliceps (Therapsida, Anomodontia)
Open the record for dataset details and reuse information.
Data from: facial growth and development trajectories based on 3D images: geometric morphometrics with a deformation perspective
Open the record for dataset details and reuse information.
Random forests for predicting species identity of forensically important blow flies (Diptera: Calliphoridae) and flesh flies (Sarcophagidae) using geometric morphometric data: proof of concept
Open the record for dataset details and reuse information.
Supplementary material from: ZooMS confirms geometric morphometrics species identification of ancient sheep and goat
Open the record for dataset details and reuse information.
Wing geometric morphometrics and COI barcoding of Culex pipiens subgroup in the Republic of Korea
Open the record for dataset details and reuse information.
Categorical versus geometric morphometric approaches to characterising the evolution of morphological disparity in Osteostraci (Vertebrata, stem-Gnathostomata)
Open the record for dataset details and reuse information.
AFLP and geometric morphometrics for Littorina fabalis
Open the record for dataset details and reuse information.
Data from: From 20 to 2? Landmark-based geometric morphometrics reveal negligible wing-shape divergence between 20 subspecies of the Apollo butterfly, Parnassius apollo (Lepidoptera, Papilionidae), in the Carpatho-Pannonian region
Open the record for dataset details and reuse information.
Data from: A 3D geometric morphometric analysis of the bovid distal humerus, with special reference to Rusingoryx atopocranion (Pleistocene, Eastern Africa)
Open the record for dataset details and reuse information.
Using geometric wing morphometrics to distinguish Aedes japonicus japonicus and Aedes koreicus
Open the record for dataset details and reuse information.
Geometric morphometric wing analysis represents a robust tool to identify female mosquitoes (Diptera: Culicidae) in Germany
Open the record for dataset details and reuse information.
Are geometric morphometric analyses replicable? Evaluating landmark measurement error and its impact on extant and fossil Microtus classification
Open the record for dataset details and reuse information.
Geometric morphometric analysis of Protoconites minor from the Cambrian (Terreneuvian) Yanjiahe Formation in Three Gorges, South China
<p>The Ediacaran to Cambrian transition is a critical interval of time during which major evolutionary changes occurred. Recently, abundant <em>Protoconites minor</em> have been recovered from the silty shales of the lower Cambrian Yanjiahe Formation (Terreneuvian, Fortunian – Stage 2) in the Three Gorges area of South China. These fossils represent an important ecological diversification of macroscopic organisms at the onset of the Cambrian. <em>Protoconites minor</em> is a probable cnidarian-grade organism preserved by carbon compression. Herein, geometric morphometric analyses are applied to crack out specimens of <em>P. minor</em> to reveal any cryptic morphological details that may have implications for their morphological diversity, ontogenetic processes, and taxonomic identification. These statistical analyses reveal a strong relationship between size and shape, which indicates that the overall shape of <em>P. minor</em> was mainly controlled by allometric growth. The smaller specimens are generally wider at the anterior, and more commonly have straight-sides. Larger individuals tend to be narrower at the anterior, with bending more common. Our analyses demonstrate that there are transitional forms between larger, strongly bent specimens and smaller, straight specimens, suggesting that the assemblage likely consists of a single species.</p>
Geometric morphometrics of endophytic oviposition traces of Odonata (Eocene, Argentina)
<p>The insertion of the Odonata ovipositor in the plant tissue generates a scar that surrounds the eggs (trace). In insects, individual egg traces are known to vary in size, but their variation in individual shape is mostly unknown. Twenty four specimens were obtained from the Laguna del Hunco (Lower Eocene, Chubut) and Río Pichileufú (Middle Eocene, Río Negro), Argentina, which had 1346 oviposition traces (MEF Collection). For the first time, a study of the shape and size of a large number of individual Odonata endophytic egg traces was carried out using traditional (general and mixed linear models) and geometric morphometrics (Fourier elliptical series) to elucidate whether there are changes in size or shape of the individual endophytic egg traces associated with the substrate used at the time of oviposition, if the Lower Eocene traces have varied in relation to those of the Middle Eocene, and if the ichnological classification (<em>Paleoovoidus arcuatus</em>, <em>P. bifurcatus</em> and <em>P. rectus</em>) reflects such variations. We found differences in size ( p < 0.05), but not in shape, in relation to the variables studied. This could reflect that the shape of Odonata eggs (inferred from the traces), unlike their size, could have a strong evolutionary constraint already observed since the Eocene.</p>
Taxonomic identification using virtual palaeontology and geometric morphometrics: a case study of Jurassic nerineoidean gastropods
<p><span>Taxonomic identification of fossils is fundamental to a wide range of geological and biological disciplines. Many fossil groups are identified based on expert judgment, which requires extensive experience and is not always available for the specific taxonomic group at hand. Nerineoideans, a group of extinct gastropods that formed a major component of Mesozoic shallow marine environments, have distinctive internal spiral folds that form the basis for their classification at the genus level. However, their identification is often inconsistent because it is based on a set of selected characters reliant upon individual interpretation. </span></p> <p><span>This study shows a non-destructive and quantitative method for their identification using micro-CT and geometric morphometrics. We examined and micro-CT-scanned nerineoidean specimens from five main families that dominated Europe, Arabia and Africa during the Middle-Late Jurassic. Optimal longitudinal slices were selected from the tomographic reconstructions or from images of polished cross-sections compiled from fossil collections, published work and online databases. Internal whorl outlines were represented by thirty evenly distributed sliding semilandmarks and shape variations were studied using the Procrustes-based geometric morphometrics method. Multivariate analysis shows that Ceritellidae and Ptygmatididae are distinct families, whereas Nerinellidae, Eunerineidae and Nerineidae fall within the same shape variance and cannot be distinguished based on internal whorl outlines. The suggested method can be applied to images from various sources as well as to poorly preserved specimens. Our case study demonstrates the importance of quantitatively re-evaluating taxonomy in the fossil record, promoting the future utility of large datasets. </span></p>
FIGURE 1 in Use of scalation landmarks in geometric morphometrics of squamate reptiles: a comment on homology
FIGURE 1. Diagrams of specimens of the Crotalus viridis complex with 14 (A) and 16 (B) supralabial scales, respectively (supralabial scale rows are shaded in grey). For (A), the red dot marks a fixed landmark at the center of the series, seven scales from the first and seven scales from the last supralabial scale. Placing a corresponding fixed landmark on specimen B requires that one choose between seven scales from the first supralabial, seven scales from the last supralabial, or the suture at the center of the series, providing three mutually exclusive options (red dots). Selecting any of these options changes the topological position of the landmark relative to the first, the last, or both of these scales in the series. Fixed landmarks applied to scale rows variable in count renders secondary homology intractable, regardless of whether scales are counted from a consistent anchor point.
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.