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60 results for “Arctica”
Data for "Shell microstructures (disturbance lines) of Arctica islandica (Bivalvia) – A potential proxy for severe oxygen depletion"
<p>All data used in the publication "Shell microstructures (disturbance lines) of <em>Arctica islandica</em> – A potential proxy for severe oxygen depletion" currently under review. This includes in situ environmental data from the Mecklenburg Bight, Baltic Sea (ODIN 2, Leibnitz Institute for Baltic Sea Research, https://odin2.io-warnemuende.de/), and biomineral unit (BMU) morphology measurements in scanning electron microscopy images of shells of <em>Arctica islandica</em>, as well as the BMU classifier used in Ilastik (Berg et al., 2019).</p> <p>Each BMU measurement represents summary statistics of the 15 % largest BMUs within one image (25, 50 and 75 % percentile of each BMU parameter). Environmental data were measured at 20 m water depth, ca. 5 m above the sediment surface.</p>
Fig. 2. Lepechinella arctica Schellenberg, 1926 in New and little known species of Lepechinella (Crustacea, Amphipoda, Lepechinellidae) and an allied new genus Lepesubchela from the North Atlantic
Fig. 2. Lepechinella arctica Schellenberg, 1926 (Dorbanella sp.), head redrawn after Schellenberg (1925).
FIGURE 52. Ascarophis arctica Polyanski, 1952. A in Guide to the Parasites of Fishes of Canada Part V: Nematoda
FIGURE 52. Ascarophis arctica Polyanski, 1952. A. male, anterior end, lateral view; B. male, posterior end, ventral view, arrows indicate the 5 th and 6 th pairs of post-caudal papillae; C. female, vulvar region, lateral view [NB: for presentational reasons, polar filaments have been omitted from in utero eggs to avoid clutter]; D. egg from uterus. (Redrawn from Appy 1981)
Parachromagasteriella arctica, sp. n. a, anterior part of the body 1 /12, ok. 3, × 600. b, tail 1 /12, ok. 3, × 600. in Terrestrial nematodes from Jan Mayen
Parachromagasteriella arctica, sp. n. a, anterior part of the body 1 /12, ok. 3, × 600. b, tail 1 /12, ok. 3, × 600.
Figure 2. Lepechinella arctica, 8.3 in Diversity and distribution of North Atlantic Lepechinellidae (Amphipoda: Crustacea)
Figure 2. Lepechinella arctica, 8.3 mm, DZMB-HH 56230, Station 879, Faeroe Island Ridge, mandible, maxilla 1, labrum, maxilliped and telson. Scale bar 1 mm.
Figure 13. Lepechinella arctica, 6.1 in Diversity and distribution of North Atlantic Lepechinellidae (Amphipoda: Crustacea)
Figure 13. Lepechinella arctica, 6.1 mm, ZMH-K 56624 and Lepechinella victoriae, 6.0 mm, ZMH-K 56620, photographed after preservation. Scale bar 1 mm.
Data from: Stay or go? Changing breeding conditions affect sexual difference in colony attendance strategies of Atlantic puffins Fratercula arctica
<p>Male and female birds have different interests in reproductive investment, which in turn may increase negative effects of poorer breeding conditions caused by e.g., climate change or ecosystem regime shifts. Using a 33-year time series with resightings of Atlantic puffins <em>Fratercula arctica</em> individually colour-ringed as breeders in previous years, we show that the difference in colony attendance of male and female birds depends on the environmental conditions for raising young, proxied by the average duration of the chick period and size of the herring <em>Clupea harengus </em>fed to the chicks in the colony each year. The longer the chick period, and thus the birds' overall investment in reproduction, the more was the sex ratio of adults sitting out on the colony surface biased in favour of males. An increase in herring size, indicating better feeding conditions for raising chicks, led to more observations of both sexes, and the increase was slightly more prominent for females than males. We discuss the results in relation to general life-history theory on sexual differences in trade-offs between individual investment in breeding and own survival. Our results suggest that females are increasingly more willing than males to invest in provisioning for the chick the longer the chick needs such care. This difference may also prove valuable as an indication of breeding conditions from only a short visit to a colony with colour-ringed birds of known sex.</p>
Fig. 2 in Short communication Somatochlora arctica (Odonata: Corduliidae) oviposing at a "lower than usual" altitude for Italy and the Mediterranean Region and first observation for the Varese Province (Northern Italy)
Fig. 2 - Location of the closer known populations of S. arctica to the study area (square). Data come from Wildermuth (2013) (stars), Pompilio et al. (2012) (crosses), Riservato et al. (2014a) (triangles) and personal communications (circle). Background: elevation (dark: low, white: high). Striped polygons: lakes. / Localizzazione delle popolazioni note di S. arctica più vicine all'area di studio (quadrato). I dati sono tratti da Wildermuth (2013) (stelle), Pompilio et al. (2012) (croci), Riservato et al. (2014a) (triangoli) e comunicazioni personali (cerchio). Sfondo: altitudine (scura: bassa, bianca:elevata). Poligoni barrati: laghi.
Fig. 3 in Short communication Somatochlora arctica (Odonata: Corduliidae) oviposing at a "lower than usual" altitude for Italy and the Mediterranean Region and first observation for the Varese Province (Northern Italy)
Fig. 3 - Lateral view of the male captured and released in July 2021. / Visione laterale del maschio catturato e rilasciato nel luglio 2021.
Fig. 1 in Short communication Somatochlora arctica (Odonata: Corduliidae) oviposing at a "lower than usual" altitude for Italy and the Mediterranean Region and first observation for the Varese Province (Northern Italy)
Fig. 1 - Lateral and frontal view of the female observed. / Visione laterale e frontale della femmina osservata.
Fig. 3 in Fatal avian malaria in captive Atlantic puffins (Fratercula arctica) in Switzerland
Fig. 3. Modified Wright-stained peripheral blood smear of a captive Atlantic puffin (case 5). Intra-erythrocytic stages of Plasmodium relictum: trophozoites (short arrows); mature meront (long arrow) with marked displacement of the erythrocyte's nucleus; pigment granules (arrowheads). Picture: Veterinary Laboratory, Vetsuisse Faculty, University of Zurich.
Fig. 1. H&E in Fatal avian malaria in captive Atlantic puffins (Fratercula arctica) in Switzerland
Fig. 1. H&E-stained histological sections of the liver (A, B, C) and the spleen (D) of captive Atlantic puffins at 400x magnification. A: Case 1, multiple protozoan Plasmodium schizonts of up to 20 μm in diameter (arrows). B: Case 2, periportal infiltration with lymphocytes and presence of multiple intracytoplasmic Plasmodium schizonts, which contain numerous merozoites (arrows). C: Case 3, Plasmodium merozoites within the liver parenchyma (arrow). D: Case 5, multiple histiocytes with intracytoplasmic brown, finely granular pigment (accumulation of iron-based pigment). (For interpretation of the references to color in this figure legend, the reader is referred to the Web version of this article.)
Fig. 2. H&E in Fatal avian malaria in captive Atlantic puffins (Fratercula arctica) in Switzerland
Fig. 2. H&E-stained histological sections of the liver (A, B, D) and the spleen (C) of captive Atlantic puffins at 1000x magnification, showing Plasmodium schizonts of up to 15 μm in diameter, containing multiple merozoites of 1–2 μm (arrows): A: Case 2, B: Case 4, C: Case 6, D: Case 7.
Fig. 6 in Trachyplax arctica, a new multiplated problematic fossil from the lower Cambrian of North Greenland
Fig. 6. Schematic illustration showing preferred interpretation of sclerite type transitions in Trachyplax arctica gen. et sp. nov., with double lines symbolising fusion of two sclerites resulting in sclerite type G, dashed grey−shaded lines symbolising alternative transitions. Not to scale.
Fig. 7 in Trachyplax arctica, a new multiplated problematic fossil from the lower Cambrian of North Greenland
Fig. 7. Reconstructions of Trachyplax arctica gen. et sp. nov., not to scale. A. Alternative 1, with cataphract arrangement of sclerite type A, based on numerical proportions of sclerite types. B, C. Alternative 2 with type A sclerites placed along the lateral margins of a bilaterally symmetrical, elongate organism (B) and an equidimensional, radially symmetrical organism (C). Randomly chosen number of sclerites.
Fig. 4 in Trachyplax arctica, a new multiplated problematic fossil from the lower Cambrian of North Greenland
Fig. 4. Multiplated problematic fossil Trachyplax arctica gen. et sp. nov., sclerite types B–E, all external views. A, B. Sclerite type B, right and left morphs. A. MGUH 29091, in dorsal view (A1), lateral view showing arching edge (A2), and lateral view (A3). B. MGUH 29092, in dorsal view. C, D. Sclerite type C, right and left morphs. C. MGUH 29093, in dorsal view. D. MGUH 29094, in dorsal view (D1) and lateral view showing arching edge (D2). E, F. Sclerite type D, right and left morphs. E. MGUH 29095, in dorsal view (E1), lateral view, profile (E2), lateral view showing arching edge (E3), and lateral view showing straight side (E4). F. MGUH 29096, in dorsal view. G. MGUH 29097, sclerite type E in external view (G1), lateral view showing straight side (G2), and lateral view, profile (G3).
Fig. 2. Schematic drawing showing measured parameters and descriptive terminology used for sclerite types A–H in Trachyplax arctica, a new multiplated problematic fossil from the lower Cambrian of North Greenland
Fig. 2. Schematic drawing showing measured parameters and descriptive terminology used for sclerite types A–H. Abbreviations: A, apical angle; Ai, apex interarea; L, length; Lr, length of rostrum; Ls, length of shield; H, height; W, width; Wai, width of apex interarea; Wr, width of rostrum; Ws, width of shield. Not to scale.
Fig. 5 in Trachyplax arctica, a new multiplated problematic fossil from the lower Cambrian of North Greenland
Fig. 5. Multiplated problematic fossil Trachyplax arctica gen. et sp. nov., sclerite types F–H, all external views. A, B. Sclerite type F. A. MGUH 29098, in dorsal view showing fold (A1) and lateral view (A2). B. MGUH 29099, in dorsal view showing twisted ridges. C, D. Sclerite type G, right and left morphs. C. MGUH 29100, in dorsal view. D. MGUH 29101, in dorsal view showing apices and apex interarea (D1) and lateral view showing apices and apex interarea (D2). E. MGUH 29102, sclerite type H in lateral view showing radial ridges (E1, E2) and external view (E3).
Fig. 1 in Trachyplax arctica, a new multiplated problematic fossil from the lower Cambrian of North Greenland
Fig. 1. Derivation of Trachyplax arctica gen. et sp. nov. A. Locality in North Greenland. B. Stratigraphy: Brønlund Fjord Group, Paralleldal Formation, indicating horizon of collection (filled circle).
Figure 4. Electra arctica Borg, 1931. ZIRAS 36 in Diversity and taxonomy of intertidal Bryozoa (Cheilostomata) at Akkeshi Bay, Hokkaido, Japan
Figure 4. Electra arctica Borg, 1931. ZIRAS 36/50535. Colony on rock collected by A. V. Grischenko, 12 September 1992, Sea of Okhotsk, western Kamchatka shelf (57°36.039N, 156°9.009E), depth 78–81 m. (A) Portion of colony showing anastomosing, narrowly multiserial branches; (B) autozooids and kenozooids; (C) enlargement of autozooids and kenozooids; (D) autozooids with operculum in place and kenozooids with nearly completely closed aperture. Specimen lightly bleached. Scale bars: 2 mm (A); 1 mm (B); 0.5 mm (C, D).
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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.