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160 results for “sea snakes”
FIGURE 4 in Hydrophis donaldi (Elapidae, Hydrophiinae), a highly distinctive new species of sea snake from northern Australia
FIGURE 4. The single most parsimonious trees for phased haplotypes of the nuclear loci (A) G1888 (B) G1894. Scale bars indicate branch lengths corresponding to 1 step.
FIGURE 3 in Hydrophis donaldi (Elapidae, Hydrophiinae), a highly distinctive new species of sea snake from northern Australia
FIGURE 3. Bayesian majority rule consensus tree of the sea snakes sampled in this study based on the concatenated mitochondrial alignment. Hydrophis donaldi sp. nov. forms a highly divergent lineage although its phylogentic position remains poorly resolved. Nodes with maximum likelihood bootstrap support>70 (below) and Bayesian posterior probability>0.8 (above) are indicated. The outgroup Aipysurus laevis is not shown. Scale bar indicates the number of nucleotide substitutions per site.
FIGURE 6. A in Aipysurus mosaicus, a new species of egg-eating sea snake (Elapidae: Hydrophiinae), with a redescription of Aipysurus eydouxii (Gray, 1849)
FIGURE 6. A) Right lateral, B) dorsal, and C) ventral photographs of the head of the holotype of Aipysurus mosaicus sp. nov. (SAMA R65222). Grid scale represents 1 x 1cm.
FIGURE 4 in Aipysurus mosaicus, a new species of egg-eating sea snake (Elapidae: Hydrophiinae), with a redescription of Aipysurus eydouxii (Gray, 1849)
FIGURE 4. Full body photographs of A) the holotype of Aipysurus mosaicus sp. nov. from northern Australia (SAMA R65222) and B) A. eydouxii from Singapore (SAMA R22569). Grid scale represents 1 x 1cm. Note that A. mosaicus has fewer bands on the body and tail and that these are less distinct.
FIGURE 1 in Aipysurus mosaicus, a new species of egg-eating sea snake (Elapidae: Hydrophiinae), with a redescription of Aipysurus eydouxii (Gray, 1849)
FIGURE 1. MrBayes all compatible consensus of 4000 post burn-in trees for the Aipysurus and Emydocephalus specimens sampled in this study based on the concatenated mitochondrial data (Hydrophis caerulescens outgroup not shown). Scale bar indicates the number of nucleotide substitutions per site. Node support values (posterior probabilities) above 0.95 are shown.
FIGURE 3 in Aipysurus mosaicus, a new species of egg-eating sea snake (Elapidae: Hydrophiinae), with a redescription of Aipysurus eydouxii (Gray, 1849)
FIGURE 3. The single most parsimonious tree for phased haplotypes of the nuclear G1888 fragment. Scale bar indicates branch lengths corresponding to 1 step.
FIGURE 5 in Aipysurus mosaicus, a new species of egg-eating sea snake (Elapidae: Hydrophiinae), with a redescription of Aipysurus eydouxii (Gray, 1849)
FIGURE 5. Micro-CT images of Aipysurus mosaicus sp. nov. from (A) left lateral and (B) dorsal view of skull, and (C) left lateral view of mid-caudal vertebrae; and Aipysurus eydouxii from (D) left lateral and (E) dorsal view of skull, and (F) left lateral view of mid-caudal vertebrae. Note the differences in the morphology of the premaxilla, maxilla, nasal, frontoparietal suture, and neural spine; see text for fuller discussion. Specimens illustrated are as follows: (A, B) SAMA R65222 holotype, (C) SAMA R23493 paratype, (D, E) MZB Ophi 4184, (F) SAMA R22569.
FIGURE 2 in Aipysurus mosaicus, a new species of egg-eating sea snake (Elapidae: Hydrophiinae), with a redescription of Aipysurus eydouxii (Gray, 1849)
FIGURE 2. The single most parsimonious tree for phased haplotypes of the nuclear G1894 fragment. Scale bar indicates branch lengths corresponding to 1 step.
FIGURE 7 in Sea snakes (Serpentes: subfamilies Hydrophiinae and Laticaudinae) in Vietnam: a comprehensive checklist and an updated identification key
FIGURE 7. Section of body of Astrotia stokesii (left) and Hydrophis gracilis (right) in ventral views, showing the ventrals divided into pairs of foliform scales and ventrals divided by a longitudinal furrow posteriorly, respectively (drawing M. Andersen).
FIGURE 3 in Sea snakes (Serpentes: subfamilies Hydrophiinae and Laticaudinae) in Vietnam: a comprehensive checklist and an updated identification key
FIGURE 3. Head of Emydocephalus annulatus (left), showing the three supralabials, of which the second is very elongated. A standard supralabial pattern for sea snakes (right) is shown for comparison (drawing M. Andersen).
FIGURE 11 in Sea snakes (Serpentes: subfamilies Hydrophiinae and Laticaudinae) in Vietnam: a comprehensive checklist and an updated identification key
FIGURE 11. Head of Hydrophis pachycercos showing the pale ring around the eye and the pale supralabials (drawing M. Post Hoegh, modified by M. Andersen).
FIGURE 2 in Sea snakes (Serpentes: subfamilies Hydrophiinae and Laticaudinae) in Vietnam: a comprehensive checklist and an updated identification key
FIGURE 2. Head of Thalassophis anomalus, showing thickened edges of larger head shields and a rostral broken up into four or five scales (drawing M. Andersen).
FIGURE 5 in Sea snakes (Serpentes: subfamilies Hydrophiinae and Laticaudinae) in Vietnam: a comprehensive checklist and an updated identification key
FIGURE 5. Underside view of the head of Enhydrina schistosa (left), showing the elongated mental shield. A standard sea snake pattern (Hydrophis sp.) is shown at right (drawing M. Andersen).
FIGURE 1 in Sea snakes (Serpentes: subfamilies Hydrophiinae and Laticaudinae) in Vietnam: a comprehensive checklist and an updated identification key
FIGURE 1. Head of Laticauda laticaudata (left) and Hydrophis ornatus (right), showing presence and absence of internasals,
FIGURE 4 in Sea snakes (Serpentes: subfamilies Hydrophiinae and Laticaudinae) in Vietnam: a comprehensive checklist and an updated identification key
FIGURE 4. Underside views of the head (left) and the vent (right) region of Thalassophina viperina, showing enlarged ventrals on the anterior part of body (drawing M. Andersen).
FIGURE 10 in Sea snakes (Serpentes: subfamilies Hydrophiinae and Laticaudinae) in Vietnam: a comprehensive checklist and an updated identification key
FIGURE 10. Dorsal colour pattern close to the head of Hydrophis lamberti (left) and H. ornatus (right) (drawing M. Andersen).
FIGURE 9 in Sea snakes (Serpentes: subfamilies Hydrophiinae and Laticaudinae) in Vietnam: a comprehensive checklist and an updated identification key
FIGURE 9. Lateral view of midbody of Lapemis curtus, showing the enlarged scales in the lower-most scale rows (drawing M.
FIGURE 12 in Sea snakes (Serpentes: subfamilies Hydrophiinae and Laticaudinae) in Vietnam: a comprehensive checklist and an updated identification key
FIGURE 12. Sea snakes from Vietnam. Five pairs (rows) in left, right order from top to bottom, as follows: 1. Acalyptophis peronii, Hydrophis atriceps, 2. H. belcheri, H. cyanocinctus, 3. H. lamberti, H. melanocephalus, 4. H. ornatus, H. pachycercos, 5. Kerilia jerdonii, Thalassophina viperina.
Population dynamics of the sea snake Emydocephalus annulatus
<p>For sea snakes as for many types of animals, long-term studies on population biology are rare and hence, we do not understand the degree to which annual variation in population sizes is driven by density-dependent regulation versus by stochastic abiotic factors. We monitored three populations of turtle-headed sea snakes (<i>Emydocephalus annulatus</i>) in New Caledonia over an 18-year period. Annual recruitment (% change in numbers) showed negative density-dependence: that is, recruitment increased when population densities were low, and decreased when densities were high. Windy weather during winter increased survival of neonates, perhaps by shielding them from predation; but those same weather conditions reduced body condition and the reproductive output of adult snakes. The role for density-dependence in annual dynamics of these populations is consistent with the slow, K-selected life-history attributes of the species; and the influence of weather conditions on reproductive output suggests that females adjust their allocation to reproduction based on food availability during vitellogenesis.</p>
Divergence in life-history traits among three populations of the sea snake Emydocephalus anulatus
<p><span>Life-history traits such as rates of growth, survival and reproduction can vary though time within a single population, or through space among populations, due to abiotically-driven changes in resource availability. In terrestrial reptiles, parameters such as temperature and rainfall generate variation in life-histories – but other parameters likely are more important in marine systems. We studied three populations of sea snakes (<em>Emydocephalus annulatus</em>) in adjacent bays in the IndoPacific archipelago of New Caledonia. The extreme philopatry of individual snakes allows us to unambiguously allocate each animal to one of the three populations. Although water temperatures and rainfall do not differ over this small scale, one site experiences more intense winds, restricting opportunities for foraging. Our 18-year mark-recapture dataset (>1,200 snakes, >2,400 captures) reveals significant divergence among populations in life-history traits. Survival rates and population densities were similar among sites, but snakes at the most wind-exposed site (Anse Vata) exhibited lower body condition, slower growth, less frequent production of litters, and smaller litters. Weather-driven variation in feeding rates thus may affect life-history traits of marine snakes as well as their terrestrial counterparts, but driven by different parameters (e.g., wind exposure rather than variation in temperatures or rainfall).</span></p>
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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.