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.
100
datasets available to search
ShareScore release 0.7.1
Dataset results
100 results for “Crocodylus”
Data from: Genetic and morphological evidence of a geographically widespread hybrid zone between two crocodile species, Crocodylus acutus and Crocodylus moreletii
<p>Hybrid zones represent natural laboratories to study gene flow, divergence and the nature of species boundaries between closely related taxa. We evaluated the level and extent of hybridization between <em>Crocodylus moreletii </em>and<em> C. acutus </em>using genetic and morphological data on 300 crocodiles from 65 localities. To our knowledge, this is the first genetic study that includes the entire historic range and sympatric zone of the two species. Contrary to expectations, Bayesian admixture proportions and maximum likelihood estimates of hybrid indexes revealed that most sampled crocodiles were admixed and that the hybrid zone is geographically extensive, extending well beyond their historical region of sympatry. We identified a few geographically isolated, non-admixed populations of both parental species. Hybrids do not appear to be F<sub>1</sub>s or recent backcrosses, but rather are more likely later-generation hybrids, suggesting that hybridization has been going on for several to many generations and is mostly the result of natural processes. <em>C. moreletii </em>is not the sister species of <em>C. acutus,</em> suggesting that the hybrid zone formed from secondary contact rather than primary divergence. Non-admixed individuals from the two species were distinguishable based on morphological characters, whereas hybrids had a complex mosaic of morphological characters that hinders identification in the wild. Very few non-admixed <em>C. acutus</em> and <em>C. moreletii</em> populations exist in the wild. Consequently, the last non-admixed <em>C. moreletii</em> populations have become critically endangered. Indeed, not only the parental species but also the naturally occurring hybrids should be considered for their potential conservation value.</p>
Triangular Mesh of the Brain of a Nile Crocodile (Crocodylus niloticus)
<p>Triangular Mesh of the Brain of a Nile Crocodile (<i>Crocodylus niloticus</i>) from http://braincatalogue.org/Nile_crocodile</p>
Fig. 3 in Effect of vegetation and abiotic factors on the abundance and population structure of Crocodylus acutus (Cuvier, 1806) in coastal lagoons of Colima, Mexico
Fig. 3. Dendrogram considering the crocodiles observed, water salinity, temperature, depth, and the four vegetation types present. Acronym definitions and characteristics of the sites are given in Table 1.
Fig. 1 in Effect of vegetation and abiotic factors on the abundance and population structure of Crocodylus acutus (Cuvier, 1806) in coastal lagoons of Colima, Mexico
Fig. 1. Selected sites in the study area. Acronym definitions and characteristics of the sites are given in Table 1.
Fig. 2 in Effect of vegetation and abiotic factors on the abundance and population structure of Crocodylus acutus (Cuvier, 1806) in coastal lagoons of Colima, Mexico
Fig. 2. Non-metric Multidimensional Scaling (NMDS) analysis showing the formation of two groups, by taking into account the crocodiles observed, water salinity, temperature, depth, and the four vegetation types present. Acronym definitions and characteristics of the sites are given in Table 1.
Fig. 4 in New records of Hepatozoon and Oswaldofilaria from saltwater crocodiles (Crocodylus porosus) in Australia
Fig. 4. Relationship of a new species of Oswaldofilaria (bold) from the blood of the saltwater crocodile with representative taxa represented in the GenBank database, established based on a phylogenetic analysis of sequence data from part of the mitochondrial cytochrome c oxidase subunit 1 gene (cox1; 681 bp) employing the neighbour-joining distance method. Branch supports are represented by neighbour-joining bootstrap percentages. Members of the genus Spirocerca were used as outgroups.
Fig. 3 in New records of Hepatozoon and Oswaldofilaria from saltwater crocodiles (Crocodylus porosus) in Australia
Fig. 3. Microfilaria of a species of Oswaldofilaria in a blood smear from a saltwater crocodile (Crocodylus porosus). Stained with Wright's Giemsa; examined at 100-times magnification; scale bar = 5 μm.
Fig. 1. A in New records of Hepatozoon and Oswaldofilaria from saltwater crocodiles (Crocodylus porosus) in Australia
Fig. 1. A stage of Hepatozoon identified in erythrocytes in blood smears from a saltwater crocodile (Crocodylus porosus). Stained with Wright's Giemsa; examined at 100× magnification; scale bar = 5 μm.
Fig. 2 in New records of Hepatozoon and Oswaldofilaria from saltwater crocodiles (Crocodylus porosus) in Australia
Fig. 2. Relationship of a new species of Hepatozoon (bold) identified in erythrocytes from the blood of the saltwater crocodile with representative taxa represented in the GenBank database, established based on a phylogenetic analysis of sequence data from part of the small subunit of nuclear ribosomal RNA gene (SSU; 889 bp) employing the neighbour-joining distance method. Branch supports are represented by neighbour-joining bootstrap percentages. Species of Dactylosoma were used as outgroups.
Figure 13 in The Nomenclature and Type Material of Crocodylus johnstoni (Krefft, 1873)
Figure 13. Dorsal view of vertebrae and ribs of AM R134548 at midbody, showing damage to the transverse processes
Figure 12 in The Nomenclature and Type Material of Crocodylus johnstoni (Krefft, 1873)
Figure 12. Dorsal view of the mounted skeleton AM R134548, purported to be from the same individual as the
Figure 6 in The Nomenclature and Type Material of Crocodylus johnstoni (Krefft, 1873)
Figure 6. Reproduction of image of the cast of the head of the holotype of Crocodilus johnsonii Krefft, from Gray (1874). Note correspondence of the posterior edge of the cast with the anterior edge of the holotype skin.
Figure 1 in The Nomenclature and Type Material of Crocodylus johnstoni (Krefft, 1873)
Figure 1. Left lateral view of a dried head of Crocodylus johnstoni, possibly the holotype of Crocodilus australis Krefft and Tomistoma krefftii Gray, in Krefft (image created from Negative V343, Australian Museum Archives).
Figure 11. Image from Negative V345 in The Nomenclature and Type Material of Crocodylus johnstoni (Krefft, 1873)
Figure 11. Image from Negative V345 (Australian Museum Archives); dorsal view of the intact holotype skin of Crocodilus johnsonii Krefft. Compare with Fig. 2 (the same skin at the present time), and Figs 7–9, representing closer views of segments of the specimen.
Figure 4 in The Nomenclature and Type Material of Crocodylus johnstoni (Krefft, 1873)
Figure 4. Ventral view of holotype skin of Crocodilus johnsonii Krefft. Note the low number of transverse ventral scale rows on the body, diagnostic of this species.
Figure 7. Image from Negative V341 in The Nomenclature and Type Material of Crocodylus johnstoni (Krefft, 1873)
Figure 7. Image from Negative V341 (Australian Museum Archives); dorsal view of head and neck of holotype of Crocodilus johnsonii Krefft. Image most likely taken in 1873, at time of description. Compare with Figs 6 and 8. The white line between anterior rows of dorsal scutes appears to be a chalk mark that, together with the scute configuration, allows alignment of this image with Fig. 8.
Fig. 4 in Population size, demography and diet of the Siamese crocodile, Crocodylus siamensis (Schneider, 1801) in the Mesangat Swamp in Kalimantan, Indonesia
Fig. 4. Relative dry weight of each prey category found in all 13 samples of stomach lavages from Crocodylus siamensis.
Fig. 1 in Population size, demography and diet of the Siamese crocodile, Crocodylus siamensis (Schneider, 1801) in the Mesangat Swamp in Kalimantan, Indonesia
Fig. 1. The Mesangat wetland in East Kalimantan (inset: the Mesangat position within Kalimantan). Black – Villages; Black with Red dot – Survey locations; maps modified after © OpenStreetMap).
Fig. 2 in Population size, demography and diet of the Siamese crocodile, Crocodylus siamensis (Schneider, 1801) in the Mesangat Swamp in Kalimantan, Indonesia
Fig. 2. Code for cut tail scutes on Crocodylus siamensis in Danau Mesangat (modified after Kay, 2004).
FIGURE 12 in The Cuban Crocodile (Crocodylus rhombifer) from Late Quaternary Underwater Cave Deposits in the Dominican Republic
FIGURE 12. Map of the West Indies showing the location of Late Quaternary sites containing crocodiles. Fossil samples from Abaco and Grand Bahama in the Bahamas, Cuba, Dominican Republic, and Grand Cayman include skulls or partial skulls that can be confidently identified as the Cuban crocodile (Crocodylus rhombifer). All other records consist of fragmentary or isolated specimens identified as either Crocodylus sp. or Crocodylia indeterminate. Site numbers are as follows (sites 1–22 are from various islands in the Bahamas): Abaco (see Morgan and Albury, 2013, for an enlarged map of Abaco showing the location of these fossil sites): 1. Sawmill Sink; 2. Dan's Cave; 3. Ralph's Cave; 4. Nancy's Cave; 5. Lost Reel Cave. 6. Gilpin Point. Grand Bahama: 7. Bell Channel; 8. Anaconda Pond; 9. Mermaid's Lair. Eleuthera: 10. White Lake Cave; 11. Kelly's Blue Hole (= Bung Hole); 12. Mermaid's Pool; 13. Preacher's Cave. New Providence: 14. Banana Hole. San Salvador: 15. Hanna's Bananas. Great Exuma: 16. Isaac Bay Cave. Rum Cay: 17. Bobby's Cave. Crooked Island: 18. Pittstown Landing; 19. 1702 Cave. Acklins: 20. Rupert's Pond; 21. Delectable Bay. Mayaguana: 22. The Fountain. Grand Cayman (see Morgan and Albury, 2013, for an enlarged map of Grand Cayman showing the location of these fossil sites): 23. Crocodile Canal; 24. Prospect; 25. Chisholm Cow Well; 26. Connally Cow Well; 27. Queen Elizabeth II Botanic Park; 28. Furtherland Farms Cow Well; 29. Crab Cave. Cuba: 30. Cueva Lamas; 31. Las Breas de San Felipe; 32. Ciego Montero; 33. Casimbas de las Llanadas; 34. Caves of Cueiba. Jamaica: 35. Wallingford Roadside Cave; 36. Dairy Cave; 37. Bellevue. Hispaniola (Dominican Republic): 38. Oleg's Bat Cave; 39. Ni-Rahu (= Cueva de Lynn). Puerto Rico: 40. Cueva Salida. Mona Island: 41. Cueva de los Losetas.
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.