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64 results for “Marine turtle”
FIGURES 21–25 in Chelonicola and Poulinea, two new gomphonemoid diatom genera (Bacillariophyta) living on marine turtles from Costa Rica
FIGURES 21–25. Poulinea lepidochelicola. SEM pictures taken from the holotype population from the olive ridley sea turtle carapace collected on Ostional Beach, Costa Rica. 21. External view of an entire valve showing the raphe structure, the striae composed of two enlarged areolae and the fascia with only one reduced stria. 22. External detail of a headpole with the siliceous covering of the distal raphe fissure and the lack of an apical pore field. 23. External detail of a footpole with the thickened siliceous covering of the distal raphe fissure and the presence of several areolae surrounding the apex. 24. External detail of the central area showing the spatulate proximal raphe endings. 25. External detail of the striae. Note the hymenate coverings in the areolae canals. Scale bar represents 1 μm except for Fig. 21 where scale bar = 10 μm.
FIGURES 13–20 in Chelonicola and Poulinea, two new gomphonemoid diatom genera (Bacillariophyta) living on marine turtles from Costa Rica
FIGURES 13–20. Poulinea lepidochelicola. SEM pictures taken from the holotype population from the olive ridley sea turtle carapace collected on Ostional Beach, Costa Rica. 13. Several frustules attached to the substrate showing how the population is organised. 14. Five frustules attached to the substrate showing the headpoles and the girdle bands. 15. External girdle view of an entire frustule showing the girdle bands and the mantle. 16. External girdle view of an entire valve showing the mantle, the distal raphe fissures and the doubling of the perforation of the girdle bands near the footpole. 17. External detail of the footpole. The arrow shows the doubling of the poroids. 18. External detail of the headpole. 19. Internal view of an entire valve showing the raphe sternum, the septate girdle bands and the covered areolae. 20. Second copula with the typical septum at the footpole. Scale bar represents 10 μm, except for Figs 17, 18 where scale bar = 1 μm.
FIGURES 7–12 in Chelonicola and Poulinea, two new gomphonemoid diatom genera (Bacillariophyta) living on marine turtles from Costa Rica
FIGURES 7–12. Chelonicola costaricensis. SEM pictures taken from the holotype population from the olive ridley sea turtle carapace collected on Ostional Beach, Costa Rica. 7. External valve face view showing the mantle and the areolae. 8. External detail of a footpole showing the absence of an apical pore field and the distal raphe fissure continuing onto the mantle. 9 & 10. Internal views of an entire valve showing the raphe sternum, the septate girdle bands and the covered areolae. 11. Internal detail of the central area. 12. Internal detail of the footpole with helictoglossa. Scale bar represents 1 μm.
FIGURES 1–6 in Chelonicola and Poulinea, two new gomphonemoid diatom genera (Bacillariophyta) living on marine turtles from Costa Rica
FIGURES 1–6. Chelonicola costaricensis. SEM pictures taken from the holotype population from the olive ridley sea turtle carapace collected on Ostional Beach, Costa Rica. 1. Three frustules of Chelonicola attached to the substrate together with one frustule (upper one) of Poulinea. 2. Several valves of Chelonicola attached to the substrate showing their valve face and the girdle composition. 3. One frustule attached to the substrate by a mucilaginous stalk. The girdle structure composed of at least 10 bands is shown. 4. Valve face view showing the head pole with the distal raphe fissure continuing onto the mantle. 5. External detail of the central area showing the lack of fascia and the stria structure. 6. External detail of a head pole showing the distal raphe fissure. Scale bar represents 10 μm except for Figs 5, 6 where scale bar = 1 μm.
Data from: Nuclear markers reveal a complex introgression pattern among marine turtle species on the Brazilian coast
A surprisingly high frequency of interspecific sea turtle hybrids have been previously recorded in a nesting site along a short stretch of the Brazilian coast. Mitochondrial DNA data indicated that as much as 43% of the females identified as E. imbricata are hybrids in this area (Bahia State of Brazil). It is a remarkable find, since most of the nesting sites surveyed worldwide, including some in northern Brazil, presents no hybrids, and rare Caribbean sites present no more than 2% of hybrids. Thus, a detailed understanding of the hybridization process is needed to evaluate natural or anthropogenic causes of this regional phenomenon in Brazil, which could be an important factor affecting the conservation of this population. We analyzed a set of 12 nuclear markers to investigate the pattern of hybridization involving three species of sea turtles: hawksbill (Eretmochelys imbricata), loggerhead (Caretta caretta), and olive ridley (Lepidochelys olivacea). Our data indicate that most of the individuals in the crossings L. olivacea × E. imbricata and L. olivacea × C. caretta are F1 hybrids, whereas C. caretta × E. imbricata crossings present F1 and backcrosses with both parental species. In addition, the C. caretta × E. imbricata hybridization seems to be gender and species biased, and we also found one individual with evidence of multispecies hybridization among C. caretta × E. imbricata × Chelonia mydas. The overall results also indicate that hybridization in this area is a recent phenomenon, spanning at least two generations or ~40 years.
Figure 5 in Male-biased in-water population of loggerhead turtle (Caretta caretta) in Dalyan, Turkey possible important marine turtle area in the Mediterranean
Figure 5. Comparison of BCI between female, male, and subadult individuals (The line in the boxes represents the median value, the boxes represent interquartile range between first and third quartiles).
Data from: MarTurtSI, a global database of stable isotope analyses of marine turtles
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Data from: Geography best explains global patterns of genetic diversity and post-glacial co-expansion in marine turtles
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Data from: Evidence of opposing fitness effects of parental heterozygosity and relatedness in a critically endangered marine turtle?
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Data from: A gravid fossil turtle from the Early Cretaceous reveals a different egg development strategy to that of extant marine turtles
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Data from: Nuclear markers reveal a complex introgression pattern among marine turtle species on the Brazilian coast
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Data from: Habitat collapse due to overgrazing threatens turtle conservation in marine protected areas
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Long-term trends in marine turtle size at maturity at an important Atlantic rookery
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Data from: A new phylogenetic hypothesis of turtles with implications for the timing and number of evolutionary transitions to marine lifestyles in the group
Evolutionary transitions to marine habitats occurred frequently among Mesozoic reptiles. Only one such clade survives to the present: sea turtles (Chelonioidea). Other marine turtles originated during the Mesozoic, but uncertain affinities of key fossils have obscured the number of transitions to marine life, and the timing of the origin of marine adaptation in chelonioids. Phylogenetic studies support either a highly‐inclusive chelonioid total‐group including fossil marine clades from the Jurassic and Cretaceous (e.g. protostegids, thalassochelydians, sandownids) or a less inclusive chelonioid total‐group excluding those clades. Under this paradigm, these clades belong outside Cryptodira, and represent at least one additional evolutionary transition to marine life in turtles. We present a new phylogenetic hypothesis informed by high resolution computed tomographic data of living and fossil taxa. Besides a well‐supported Chelonioidea, which includes protostegids, we recover a previously unknown clade of stem‐group turtles, Angolachelonia, which includes the Late Jurassic thalassochelydians, and the Cretaceous–Palaeogene sandownids. Accounting for the Triassic Odontochelys, our results indicate three independent evolutionary transitions to marine life in non‐pleurodiran turtles (plus an additional two‐three in pleurodires). Among all independent origins of marine habits, a pelagic ecology only evolved once, among chelonioids. All turtle groups that independently invaded marine habitats in the Jurassic–Cretaceous (chelonioids, angolachelonians, bothremydid pleurodires) survived the Cretaceous–Palaeogene mass extinction event. This highlights extensive survival of marine turtles compared to other marine reptiles. Furthermore, deeply‐nested clades such as chelonioids are found by the middle Early Cretaceous, suggesting a rapid diversification of crown‐group turtles during the Early Cretaceous.
Figure 5 from: Assou D, Segniagbeto GH, Radji R, Akiti J, Pando F (2018) Monitoring data of marine turtles on the Togolese coast during 2012–2013. ZooKeys 779: 109-118. https://doi.org/10.3897/zookeys.779.26967
Figure 5 Sea turtle species considered in the survey: aLepidochelysolivaceabCheloniamydascDermochelyscoriacea.
FIGURE 32 in Chelonicola and Poulinea, two new gomphonemoid diatom genera (Bacillariophyta) living on marine turtles from Costa Rica
FIGURE 32. Strict consensus tree of four most parsimonious cladograms.
Data from: A new phylogenetic hypothesis of turtles with implications for the timing and number of evolutionary transitions to marine lifestyles in the group
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Figure 2 from: Assou D, Segniagbeto GH, Radji R, Akiti J, Pando F (2018) Monitoring data of marine turtles on the Togolese coast during 2012–2013. ZooKeys 779: 109-118. https://doi.org/10.3897/zookeys.779.26967
Figure 2 Monitoring program sites (Segniagbeto et al. 2017).
Figure 3 from: Assou D, Segniagbeto GH, Radji R, Akiti J, Pando F (2018) Monitoring data of marine turtles on the Togolese coast during 2012–2013. ZooKeys 779: 109-118. https://doi.org/10.3897/zookeys.779.26967
Figure 3 Distribution of marine turtle occurrences by species on the Togolese coast.
Figure 1 from: Assou D, Segniagbeto GH, Radji R, Akiti J, Pando F (2018) Monitoring data of marine turtles on the Togolese coast during 2012–2013. ZooKeys 779: 109-118. https://doi.org/10.3897/zookeys.779.26967
Figure 1 Region of the record Datasets of sea turtles (coastal areas of Ghana, Togo and Benin).
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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)
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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.