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1,140 results for “feathers”
Fig. 4 in The First Report of the Feather Mite Pseudalloptinus milvulinus (Acariformes: Pterolichidae) from the Black Kite Milvus migrans in Japan
Fig. 4. Pseudalloptinus milvulinus: A, male (MPM Coll. No. 21696a). B, female (MPM Coll. No. 21696d). A, Ventral view, terminal membrane (white arrowhead) and adanal suckers (dark arrowhead); B, spermatheca and speprmaducts of female.
Fig. 1 in The First Report of the Feather Mite Pseudalloptinus milvulinus (Acariformes: Pterolichidae) from the Black Kite Milvus migrans in Japan
Fig. 1. Pseudalloptinus milvulinus: A, D, E, male (MPM Coll. No. 21696a). B, C, female (MPM Coll. No. 21696d). A, B, Ventral view; C, idiosomal seta c3; D, disposition if setae g, 4a and ps3 (arrowheads) on ventral idiosoma; E, ventral view of opisthosoma with terminal membranes (white arrowhead) and adanal suckers (dark arrowhead).
Figure 3 Nycteridocaulus sulcatussp. n in Two new feather mites of the subfamily Proctophyllodinae (Acariformes: Proctophyllodidae) from the Yellow-bellied Flycatcher Empidonax flaviventris (Passeriformes: Tyrannidae) in Canada
Figure 3 Nycteridocaulus sulcatussp. n., details: A–C – legs I–III of male, respectively, D – tibia and tarsus IV of male, E – tibia and tarsus IV of female, F – spermatheca and spermaducts, G – opisthosoma of male, ventral view. Abbreviations: ad– adanal shield, ga– genital arch, hs– head of spermatheca, pd– primary spermaduct, pg – pregenital apodemes, sd – secondary spermaducts, tl– terminal lamella.
Data and code from: Evolution of brilliant iridescent feather nanostructures
<p>The brilliant iridescent plumage of birds creates some of the most stunning color displays known in the natural world. Iridescent plumage colors are produced by nanostructures in feathers and have evolved in a wide variety of birds. The building blocks of these structures—melanosomes (melanin-filled organelles)—come in a variety of forms, yet how these different forms contribute to color production across birds remains unclear. Here, we leverage evolutionary analyses, optical simulations and reflectance spectrophotometry to uncover general principles that govern the production of brilliant iridescence. We find that a key feature that unites all melanosome forms in brilliant iridescent structures is thin melanin layers. Birds have achieved this in multiple ways: by decreasing the size of the melanosome directly, by hollowing out the interior, or by flattening the melanosome into a platelet. The evolution of thin melanin layers unlocks color-producing possibilities, more than doubling the range of colors that can be produced with a thick melanin layer and simultaneously increasing brightness. We discuss the implications of these findings for the evolution of iridescent structures in birds and propose two evolutionary paths to brilliant iridescence.</p>
Can diet composition estimates using stable isotope analysis of feathers predict growth and condition in nestling mountain bluebirds (Sialia currucoides)
<p>Insectivorous birds breeding in seasonal environments provision their dependent young during periods when prey diversity and abundance vary. Consequently, the composition and nutritional value of diets parents feed to their offspring may differ within and among broods, potentially affecting the condition of nestlings. In a population of mountain bluebirds (<i>Sialia currucoides</i>), we used two methods to estimate diet composition for individual nestlings: direct observation of provisioning using video recordings at 5 and 9 days post-hatch, and stable isotopes of the δ<sup>13</sup>C and δ<sup>15</sup>N in nestling feathers and prey followed by analysis with mixing models. We determined the macronutrient content (% fat and lean mass) and estimated the metabolized energy from each type of prey. We evaluated whether different methods of estimating diet composition would produce similar results, and if the types of prey nestlings ate at one or both ages affected their morphology, growth rates, or blood ketone concentration. We found that bluebirds fed their young 5 main types of prey: beetles, cicadas, grasshoppers, insect larvae, and spiders. Both observational and mixing model estimates of diet composition indicated that larvae are traded-off with grasshoppers, and that fewer larvae are provided to nestlings as the season progresses. In evaluating how diet influences individual growth and condition, estimates from direct observations had greater explanatory power than those from mixing models, indicating that diets rich in the most energy-dense prey (greatest fat content; cicadas and larvae) were associated with larger size and higher body condition, and faster rate of mass gain and growth of tarsus. Lower value prey had more limited, specific effects on nestlings, but may still be important dietary components. While isotopic methods produced estimates of diet composition that were generally informative, when applied to explain the growth and condition of nestlings they proved less useful. </p>
Figs 25–30. Proctophyllodes spp., male. 25–27. Leg I. 28–30. Tibia and tarsus IV. 25, 28. P in Four new feather mite species of the genus Proctophyllodes Robin (Astigmata: Proctophyllodidae) from China
Figs 25–30. Proctophyllodes spp., male. 25–27. Leg I. 28–30. Tibia and tarsus IV. 25, 28. P. brevis sp. nov. 26, 29. P. garrula sp. nov. 27, 30. P. canora sp. nov. Scale bar = 50 μm.
Figs 23–24 in Four new feather mite species of the genus Proctophyllodes Robin (Astigmata: Proctophyllodidae) from China
Figs 23–24. Proctophyllodes canora sp. nov., female. 23. Dorsal view. 24. Ventral view. Scale bar = 100 μm.
Figs 20–22 in Four new feather mite species of the genus Proctophyllodes Robin (Astigmata: Proctophyllodidae) from China
Figs 20–22. Proctophyllodes canora sp. nov., male. 20. Dorsal view. 21. Ventral view. 22. Anal sucker of paratype. Scale bars: 20–21 = 100 μm, 22 = 10 μm.
Figs 18–19 in Four new feather mite species of the genus Proctophyllodes Robin (Astigmata: Proctophyllodidae) from China
Figs 18–19. Proctophyllodes garrula sp. nov., female. 18. Dorsal view. 19. Ventral view. Scale bar = 100 μm.
Figs 15–17 in Four new feather mite species of the genus Proctophyllodes Robin (Astigmata: Proctophyllodidae) from China
Figs 15–17. Proctophyllodes garrula sp. nov., male. 15. Dorsal view. 16. Ventral view. 17. Anal sucker. Scale bars: 15–16 = 100 μm, 17 = 10 μm.
Figs 4–5 in Four new feather mite species of the genus Proctophyllodes Robin (Astigmata: Proctophyllodidae) from China
Figs 4–5. Proctophyllodes flexuosa sp. nov., female. 4. Dorsal view. 5. Ventral view. Scale bar = 100 μm.
Figs 13–14 in Four new feather mite species of the genus Proctophyllodes Robin (Astigmata: Proctophyllodidae) from China
Figs 13–14. Proctophyllodes brevis sp. nov., female. 13. Dorsal view. 14. Ventral view. Scale bar = 100 μm.
Figs 1–3 in Four new feather mite species of the genus Proctophyllodes Robin (Astigmata: Proctophyllodidae) from China
Figs 1–3. Proctophyllodes flexuosa sp. nov., male. 1. Dorsal view. 2. Ventral view. 3. Anal sucker. Scale bars: 1–2 = 100 μm, 3 = 10 μm.
Figs 10–12 in Four new feather mite species of the genus Proctophyllodes Robin (Astigmata: Proctophyllodidae) from China
Figs 10–12. Proctophyllodes brevis sp. nov., male. 10. Dorsal view. 11. Ventral view. 12. Anal sucker. Scale bars: 10–11 =
Figs 6–9 in Four new feather mite species of the genus Proctophyllodes Robin (Astigmata: Proctophyllodidae) from China
Figs 6–9. Proctophyllodes flexuosa sp. nov., male. 6. Leg I. 7. Leg II. 8. Leg III. 9. Leg IV. Scale bars = 50 μm.
Figure 12 Proterothrix papuensis n in Three new feather mite species of the genusProterothrix Gaud, 1968 (Analgoidea: Proctophyllodidae: Pterodectinae) from birds of paradise (Passeriformes: Paradisaeidae)
Figure 12 Proterothrix papuensis n. sp., female. A – D details of female legs, dorsal view, A – leg I, B – leg II, C – leg III, D – leg IV, E – spermatheca and spermaducts of female. Abbreviations: hs – head of spermatheca, pd – primary spermaduct, sd – secondary spermaduct.
Figure 10 Proterothrix papuensis n in Three new feather mite species of the genusProterothrix Gaud, 1968 (Analgoidea: Proctophyllodidae: Pterodectinae) from birds of paradise (Passeriformes: Paradisaeidae)
Figure 10 Proterothrix papuensis n. sp., male. A – D details of male legs, dorsal view, A – leg I, B – leg II, C – leg III, D – leg IV, E – opisthosoma of male, ventral view.
Figure 6 Figure 6. Proterothrix modestasimilis n in Three new feather mite species of the genusProterothrix Gaud, 1968 (Analgoidea: Proctophyllodidae: Pterodectinae) from birds of paradise (Passeriformes: Paradisaeidae)
Figure 6 Figure 6. Proterothrix modestasimilis n. sp., male. A – D details of male legs, dorsal view, A – leg I, B – leg II, C – leg III, D – leg IV, E – opisthosoma of male, ventral view.
Figure 4 Figure 4. Proterothrix maior n in Three new feather mite species of the genusProterothrix Gaud, 1968 (Analgoidea: Proctophyllodidae: Pterodectinae) from birds of paradise (Passeriformes: Paradisaeidae)
Figure 4 Figure 4. Proterothrix maior n. sp., female. A – D details of female legs, dorsal view, A – leg I, B – leg II, C – leg III, D – leg IV. E – spermatheca and spermaducts of female. Abbreviations: hs – head of spermatheca, pd – primary spermaduct, sd – secondary spermaduct.
Figure 2 Figure 2. Proterothrix maior n in Three new feather mite species of the genusProterothrix Gaud, 1968 (Analgoidea: Proctophyllodidae: Pterodectinae) from birds of paradise (Passeriformes: Paradisaeidae)
Figure 2 Figure 2. Proterothrix maior n. sp., male. A – D details of male legs, dorsal view, A – leg I, B – leg II, C – leg III, D – leg IV, E – opisthosoma of male, ventral view.
ScienceDex guides
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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.