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.
139
datasets available to search
ShareScore release 0.7.1
Dataset results
139 results for “Varanus”
Fixed allele differences associated with the centromere reveal chromosome morphology and rearrangements in a reptile (Varanus acanthurus Boulenger)
<p>Chromosome rearrangements are often implicated with genomic divergence and are proposed to be associated with species evolution. Rearrangements alter the genomic structure and interfere with homologous recombination by isolating a portion of the genome. Integration of multi-platform next generation DNA sequencing technologies has enabled putative identification of chromosome rearrangements in many taxa, however, integrating these data sets with cytogenetics is still uncommon beyond model genetic organisms. Therefore, to achieve the ultimate goal for the genomic classification of eukaryotic organisms, physical chromosome mapping remains critical. The ridge-tailed goannas (<em>Varanus</em> <em>acanthurus</em> BOULENGER) are a group of dwarf monitor lizards comprised of several species found throughout Northern Australia. These lizards exhibit extreme divergence at both the genic and chromosomal levels. The chromosome polymorphisms are widespread extending across much of their distribution, raising the question if these polymorphisms are homologous within the <em>V. acanthurus</em> complex. We used a combined genomic and cytogenetic approach to test for homology across divergent populations with morphologically similar chromosome rearrangements. We showed that more than one chromosome pair was involved with the widespread rearrangements. This finding provides evidence to support <em>de novo</em> chromosome rearrangements have occurred within populations. These chromosome rearrangements are characterised by fixed allele differences originating in the vicinity of the centromeric region. We then compared this region with several other assembled genomes of reptiles, chicken and the platypus. We demonstrated that the synteny of genes in chordates remains conserved despite centromere repositioning across these taxa.</p>
Fixed allele differences associated with the centromere reveal chromosome morphology and rearrangements in a reptile (Varanus acanthurus Boulenger)
Open the record for dataset details and reuse information.
Data and code from: Integrating genomics, collections, and community science to delimit species clarifies the taxonomy of a variable monitor lizard (<em>Varanus tristis</em>)
Open the record for dataset details and reuse information.
Data from: Insights into the introduction history and population genetic dynamics of the Nile monitor (Varanus niloticus) in Florida
Invasive species are widely recognized as important drivers of the ongoing biodiversity crisis. The US state of Florida is especially susceptible to the proliferation of invasive reptiles, and nonnative lizards currently outnumber native lizard species. At present, there are three documented breeding populations of the Nile monitor (Varanus niloticus) in different regions of Southern Florida, and these populations are considered potential dangers to threatened, fossorial endemics, such as burrowing owls, American crocodiles, and gopher tortoises. Nevertheless, at present, both the introduction histories of these populations and the degree to which they are connected by gene flow are not known. To address these issues, we genotyped V. niloticus from Cape Coral, Homestead Air Reserve Base, and West Palm Beach at 17 microsatellite loci and conducted a variety of analyses to assess both intra-population genetic diversity, the degree of gene flow between populations, and the most likely introduction scenario. The results of our analyses demonstrate that all three populations have limited genetic diversity (mean number of effective alleles across loci in all three populations ~ 2.00) and are highly differentiated from one another (GST = 0.268; G''ST = 0.628). Our results also suggest that these populations resulted from independent introduction events that occurred within the past few decades. Consequently, we advise that wildlife managers focus management efforts on containment of existing populations and intensification of monitoring efforts on potential migration corridors.
Data from: The roles of joint tissues and jaw muscles in palatal biomechanics of the Savannah monitor (Varanus exanthematicus) and their significance for cranial kinesis
Many vertebrates exhibit cranial kinesis, or movement between bones of the skull other than at the jaw joint. Many kinetic species possess a particular suite of features to accomplish this movement, including flexible cranial joints and protractor musculature. Whereas the skeletal anatomy of these kinetic systems is well understood, how these joints are biomechanically loaded, how different soft tissues affect joint loading and kinetic capacity, and how the protractor musculature loads the skull remain poorly understood. Here we developed a Finite Element Model of the savannah monitor, Varanus exanthematicus, a modestly kinetic lizard, to better elucidate the roles of soft tissue in mobile joints and protractor musculature on cranial loading. We described the 3D resultants of jaw muscles and histology of palatobasal, otic and jaw joints. We tested the effects of joint tissue types, bite point, and muscle loads to evaluate the biomechanical role of muscles have on the palate and braincase. We found the jaw muscles have significant mediolateral components and resultants that can impart stability across palatocranial joints. We found articular tissues affect the magnitude of strains experienced across the palatobasal and otic joints. We found that without protractor muscle loading, the palate, quadrate and braincase experience higher strains suggesting this muscle helps insulate the braincase and palatoquadrate from high loads. Finally, we found the cross-sectional properties of the bones of Varanus exanthematicus is well suited for performing under torsional loads. These findings suggest that torsion may be a significant driver in the evolution of cranial kinesis in lepidosaurs.
FIGURE 5 in A new species of Varanus Merrem (Squamata: Varanidae) from the Pilbara region of Western Australia, with observations on sexual dimorphism in closely related species
FIGURE 5. Ventral views of representative specimens of three Varanus species. Same individuals as Figure 3.
FIGURE 4 in A new species of Varanus Merrem (Squamata: Varanidae) from the Pilbara region of Western Australia, with observations on sexual dimorphism in closely related species
FIGURE 4. Dorsal views of representative specimens of three Varanus species. (a) WAM R125521 V. b u s h i sp. nov. Holotype ♂; (b) WAM R135340 V. bushi sp. nov. Paratype Ψ; (c) WAM R75792 V. gilleni Ψ; (d) WAM R135601 V. caudolineatus ♂; (e) WAM R138950 V. caudolineatus ♂.
FIGURE 3 in A new species of Varanus Merrem (Squamata: Varanidae) from the Pilbara region of Western Australia, with observations on sexual dimorphism in closely related species
FIGURE 3. Details of scalation on dorsal midbody of representative specimens of three Varanus species. (a) WAM R135340 V. b u s h i sp. nov. Paratype Ψ; (b) WAM R75792 V. gilleni Ψ; c) WAM R135601 V. caudolineatus ♂.
FIGURE 7 in A new species of Varanus Merrem (Squamata: Varanidae) from the Pilbara region of Western Australia, with observations on sexual dimorphism in closely related species
FIGURE 7. Bivariate plots of various external measurements against each of BL and HNL for male specimens of V. caudolineatus: Symbols used on each plot are: TL (triangle);BL (circle); HNL (square); HLL (cross); FLL (diamond).
FIGURE 2 in A new species of Varanus Merrem (Squamata: Varanidae) from the Pilbara region of Western Australia, with observations on sexual dimorphism in closely related species
FIGURE 2. Relationships among unique mitochondrial haplotypes obtained through sequencing of various individuals of V. caudolineatus, V. gilleni and V. bushi sp. nov. Localities for each specimen are provided in Appendix I. (a). Strict Consensus tree of six equally most parsimonious trees (length of 330 steps). Numbers above branches represent Maximum Parsimony and Minimum Evolution bootstrap proportions (each based on 1000 pseudoreplicates); numbers below branches represent decay indices. (b). Maximum Likelihood tree (InL = 2418.09) obtained using the GTR+I model of nucleotide substitution. Numbers above branches indicate bootstrap proportions (based on 100 pseudoreplicates).
FIGURE 1 in A new species of Varanus Merrem (Squamata: Varanidae) from the Pilbara region of Western Australia, with observations on sexual dimorphism in closely related species
FIGURE 1. An adult Varanus bushi sp. nov. from near Roebourne, photographed in life by Robert BrowneCooper.
FIGURE 9 in A new species of Varanus Merrem (Squamata: Varanidae) from the Pilbara region of Western Australia, with observations on sexual dimorphism in closely related species
FIGURE 9. Distribution of the three Varanus species based on examined materials and type localities. The approximate wider distribution of V. g i l l e n i is indicated by the dashed line. Symbols: Stars — V. caudolineatus; Triangles — V. gilleni; Circles — V. b u s h i sp. nov.; Circles with cross — s V. caudolineatus and V. b u s h i sp. nov. in local sympatry; Circles with dot – type localities.
FIGURE 6 in A new species of Varanus Merrem (Squamata: Varanidae) from the Pilbara region of Western Australia, with observations on sexual dimorphism in closely related species
FIGURE 6. Dorsal views of head and neck of representative specimens of three Varanus species. Same individuals as Figure 3.
FIGURE 8 in A new species of Varanus Merrem (Squamata: Varanidae) from the Pilbara region of Western Australia, with observations on sexual dimorphism in closely related species
FIGURE 8. Bivariate plots of various external measurements of the three taxa, with separate plots for males (a–d) and females (e–h): (a,e) HNL vs BL; (b,f) HNL vs TL; (c,g) HNL vs FLL; (d,h) HNL vs HLL. Symbols used on each plot are V. caudolineatus (cross); V. gilleni (hollow square); V. bushi sp. nov. (solid triangle).
FIGURE 34 in Unravelling the underestimated diversity of Philippine water monitor lizards (Squamata: Varanus salvator complex), with the description of two new species and a new subspecies
FIGURE 34. Distribution ranges of the Philippine species of the V. s a l va t o r complex according to the morphological investigations presented here: V. marmoratus = red; V. nuchalis = blue; V. palawanensis sp. nov. = green; V. rasmusseni sp. nov. = black; V. c. cumingi = yellow; and V. c. s a m a re n s i s ssp. nov. = purple. Question marks denote the water monitor populations from Mindoro, Basilan, and northern Borneo of unknown taxonomic status. The grey shaded areas indicate the paleo-shorelines of several Pleistocene aggregate island complexes, which today, form biogeographic subregions of the Philippines: I = Greater Palawan; II = Greater Luzon; III = Greater Negros–Panay; IV = Greater Mindanao; and V = Greater Sulu. Map modified after Gaulke (in press).
FIGURE 23 in Unravelling the underestimated diversity of Philippine water monitor lizards (Squamata: Varanus salvator complex), with the description of two new species and a new subspecies
FIGURE 23. Ventral view of the juvenile paratype (ZFMK 89391) of V. rasmusseni sp. nov. Photo by André Koch.
FIGURE 26 in Unravelling the underestimated diversity of Philippine water monitor lizards (Squamata: Varanus salvator complex), with the description of two new species and a new subspecies
FIGURE 26. Ventral view of the holotype (SMF 73912) of V. palawanensis sp. nov. Photo by André Koch.
FIGURE 27 in Unravelling the underestimated diversity of Philippine water monitor lizards (Squamata: Varanus salvator complex), with the description of two new species and a new subspecies
FIGURE 27. Portrait of the holotype (SMF 73912) of V. palawanensis sp. nov. Note the ill-defined temporal stripe and the dark pigmentation on the dorsal and ventral side of the tongue. Photo by André Koch.
FIGURE 20 in Unravelling the underestimated diversity of Philippine water monitor lizards (Squamata: Varanus salvator complex), with the description of two new species and a new subspecies
FIGURE 20. Ventral view of the adult holotype (ZMUC R42151) of V. rasmusseni sp. nov. Photo by André Koch.
FIGURE 19 in Unravelling the underestimated diversity of Philippine water monitor lizards (Squamata: Varanus salvator complex), with the description of two new species and a new subspecies
FIGURE 19. Dorsal view of the adult holotype (ZMUC R42151) of V. rasmusseni sp. nov. Note the lack of colour pattern. Photo by André Koch.
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.