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782 results for “abyss”
Heterogeneity in the abyssal plains: A case study in the Bering Sea
<p>The abyssal plains are vast areas without large-scale topography that occupy much of the ocean floor. Ecological research in these superficially homogenous regions benefits increasingly from non-destructive visual sampling of epifaunal organisms with imaging technology. We analysed images from ultra high-definition towed camera transects at depths around 3500 m across three stations 100–130 km apart in the Bering Sea to ask whether the density and distribution of visible epifauna indicated any substantial heterogeneity. We identified 71 different megafaunal taxa, of which 24 occurred at only one station. Measurements of the two most abundant faunal elements, the holothurian <em>Elpidia</em> <em>minutissima</em> and xenophyophores, indicated significant differences in local densities and patchy aggregations that were strikingly dissimilar among stations. One station was dominated by xenophyophores, one was relatively depauperate in both target taxa as well as other identified megafauna, and the third station was dominated by <em>Elpidia</em>. This is an unexpected level of variation at relatively small spatial scales (~100 km), within comparable transects in a well-mixed oceanic basin, reinforcing the emerging view that abyssal habitats contain landscape heterogeneity at similar spatial scales to terrestrial continental realms.</p>
Figure 9 in Revision of the genera Meteoria and Parasciadonus (Bythitidae) with a new Atlantic, abyssal species of Meteoria
Figure 9. – Parasciadonus brevibrachium, MNNH 1979-228, holotype: anterior, left gill arch.
Heterogeneity in the abyssal plains: A case study in the Bering Sea
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Data from: Dark ophiuroid biodiversity in a prospective abyssal mine field
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High connectivity at abyssal depths: Genomic and proteomic insights into population structure of the pan-Atlantic deep-sea bivalve Ledella ultima (E. A. Smith, 1885)
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Boundary layer turbulence and abyssal recipes (BLT): Moored observations
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Data: Near-bottom currents at Station M in the abyssal Northeast Pacific
<p>Current meter data collected by the Monterey Bay Aquarium Research Institute (MBARI) at Station M, located on the abyssal plain 220 km offshore of central California. Collected near the seabed at ~4000 m depth from October 2014–October 2018. Data and methods are described in the publication:</p> <p>Connolly, T. P., P. R. McGill, R. G. Henthorn, D. A. Burrier, C. Michaud, Near-bottom currents at Station M in the abyssal Northeast Pacific, <em>submitted to Deep Sea Research II</em></p> <p><strong>Data files</strong></p> <p>Each .zip folder contains a readme.txt file describing the data files.</p> <p><em>ADCP.zip</em> - contains data from a one-year Acoustic Doppler Current Profiler (ADCP) deployment. Includes the binary file uploaded from the instrument and a text file created using RDI tools.</p> <p><em>ADCP_netcdf.zip</em> - contains processed ADCP data in NetCDF format.</p> <p><em>Rover_merged.zip</em> - contains merged data files from four years of benthic rover current meter deployments, in Excel .xlsx format and comma-separated value .csv format.</p> <p><strong>Analysis code</strong></p> <p>Analysis code is available at <a href="https://github.com/tompc35/station-m-currents">https://github.com/tompc35/station-m-currents</a></p>
FIGURE 24. Orbiniella tumida n in New species and records of deep-water Orbiniidae (Annelida, Polychaeta) from the Eastern Pacific continental slope, abyssal Pacific Ocean, and the South China Sea
FIGURE 24. Orbiniella tumida n. sp. A, anterior end, dorsal view; B, anterior end, ventral view; C, posterior end, dorsal view; D, parapodium from mid-body setiger, anterior view; E–H, acicular spines. A–B, D–F, holotype (LACM-AHF Poly 11662); C, paratype (CASIZ 234032).
FIGURE 22. Orbiniella longilobata n in New species and records of deep-water Orbiniidae (Annelida, Polychaeta) from the Eastern Pacific continental slope, abyssal Pacific Ocean, and the South China Sea
FIGURE 22. Orbiniella longilobata n. sp. A, anterior end, dorsal view; B, anterior end, ventral view; C, middle body setiger, anterior view; D–E, notopodial spines. A, C–E, holotype (MCZ 153588); B, paratype (MCZ 153590).
FIGURE 20. Orbiniella eugeneruffi n in New species and records of deep-water Orbiniidae (Annelida, Polychaeta) from the Eastern Pacific continental slope, abyssal Pacific Ocean, and the South China Sea
FIGURE 20. Orbiniella eugeneruffi n. sp. Holotype MCZ 153578): A, anterior end, dorsal view; B, anterior end, ventral view; C, posterior end, dorsal view. Paratype (MCZ 153579): D, mid-body setiger, anterior view (inset not to scale).
FIGURES 17. Leodamas bathyalis n in New species and records of deep-water Orbiniidae (Annelida, Polychaeta) from the Eastern Pacific continental slope, abyssal Pacific Ocean, and the South China Sea
FIGURES 17. Leodamas bathyalis n. sp. A, anterior end dorsal view; B, thoracic setiger 9, right, posterior view; C, middle abdominal setiger, anterior view; D, neuropodial uncini (holotype); E, neuropodial uncini (paratype); F, furcate setae. A–D, F, holotype (MCZ 153569); E, paratype (MCZ 153700).
FIGURE 13. Naineris uncinata Hartman, 1957 in New species and records of deep-water Orbiniidae (Annelida, Polychaeta) from the Eastern Pacific continental slope, abyssal Pacific Ocean, and the South China Sea
FIGURE 13. Naineris uncinata Hartman, 1957. (MCZ 153572): A, anterior end, dorsal view; B, anterior end, right lateral view; C, posterior thoracic segments, right lateral view; D, posterior thoracic parapodium, anterior view; E, fascicle of thoracic neurosetae; F, detail of thoracic neuropodial uncini and capillaries. Stained with Shirlastain A.
FIGURE 11. Califia calida Hartman, 1957 in New species and records of deep-water Orbiniidae (Annelida, Polychaeta) from the Eastern Pacific continental slope, abyssal Pacific Ocean, and the South China Sea
FIGURE 11. Califia calida Hartman, 1957. (CASIZ 234031): A, anterior end, dorsal view. (CASIZ 234031): B, anterior end, ventral view. (CASIZ 234040): C, setiger 2, anterior view; D, middle abdominal setiger, anterior view; E, long, smooth neuropodial spine from setiger 2; F, short, ribbed neuropodial spine, setiger 2; G, abdominal notopodial furcate seta; H, posterior end, dorsal view.
FIGURE 10. Berkeleyia lelievre n in New species and records of deep-water Orbiniidae (Annelida, Polychaeta) from the Eastern Pacific continental slope, abyssal Pacific Ocean, and the South China Sea
FIGURE 10. Berkeleyia lelievre n. sp. A, anterior end, dorsal view; B, thoracic setiger 7, anterior view; C, posterior abdominal setiger, anterior view, insets, detail of tips of spines, not to scale. A, C, holotype (MCZ 154094), B, paratype (MCZ 154095).
FIGURE 5. Leitoscoloplos lunulus n in New species and records of deep-water Orbiniidae (Annelida, Polychaeta) from the Eastern Pacific continental slope, abyssal Pacific Ocean, and the South China Sea
FIGURE 5. Leitoscoloplos lunulus n. sp. A, anterior end, dorsal view; B, anterior end, ventral view; C, anterior end, right lateral view; D, pygidium, right lateral view; E, thoracic setiger 7, right, posterior view. A–B, D holotype (LACM-AHF Poly 11660); C, E, paratype (CASIZ 234041).
FIGURE 4 in Moebjergarctus clarionclippertonensis, a new abyssal tardigrade (Arthrotardigrada, Halechiniscidae, Euclavarctinae) from the Clarion-Clipperton Fracture Zone, North-East Pacific
FIGURE 4. Moebjergarctus clarionclippertonensis sp. nov.—the head and cephalic appendages. A. The head of a paratype (B6418500012), showing the separation of the cirrus A and primary clava; B. Ventral view of the head, showing the ventral location of external cirri (paratype B6418500016); C. Cirrus A (paratype B6418500005); D. Median cirrus (paratype B6418500013); E. External cirrus (paratype B6418500005); F. Internal cirrus (paratype B6418500013). SEM photos; scale bars A–B 6 µm; C–F 1 µm. Abbreviations: cr—cirrophore; ec—external cirrus; fl—flagellum; ic—internal cirrus; ca—cirrus A; mc—median cirrus; pc—primary clava; sa—annulated portion of the scapus; sc—secondary clava; ss—smooth portion of the scapus.
FIGURE 2 in Moebjergarctus clarionclippertonensis, a new abyssal tardigrade (Arthrotardigrada, Halechiniscidae, Euclavarctinae) from the Clarion-Clipperton Fracture Zone, North-East Pacific
FIGURE 2. Moebjergarctus clarionclippertonensis sp. nov. A. Habitus (LM photo of the holotype, B6418500008, scale bar=50 µm); B. Schematic drawing of the holotype (scale bar=50 µm); C. Dorsal view (SEM photo of a paratype, B6418500005, scale bar=20 µm). Abbreviations: an—anus; bt—buccal tube; bu—caudodorsal bulge; ce—cirrus E; ec—external cirrus; go—gonopore; ic—internal cirrus; ca—cirrus A; mc—median cirrus; pb—pharyngeal bulb; pc—primary clava; p1–p4—sensory organs on legs I–IV; sc—secondary clava; sr—seminal receptacle; st—stylet.
FIGURE 30 in Carnivorous sponges from the Australian Bathyal and Abyssal zones collected during the RV Investigator 2017 Expedition
FIGURE 30. Lycopodina cassida sp. nov. A. Fixed holotype QM G337416. B. Large anisochelae. C. Subtylostyle. D. Magnified ends of the subtylostyle illustrated in C. E. Small anisochelae. F. Looking into the calyx bowl, with the filaments around the perimeter. G. Close-up of the base of the interior of the bowl. H. Filaments illustrating the anisochelae ectosome. I. Stem remains showing the subtylostyle axis of the endosome.
FIGURE 29 in Carnivorous sponges from the Australian Bathyal and Abyssal zones collected during the RV Investigator 2017 Expedition
FIGURE 29. Lycopodina helios sp. nov., holotype QM G337468. A. Anisochelae. B. Large subtylostyles 1. C. Magnified ends of subtylostyle 1 depicted in B. D. Smaller subtylostyles 2. E. Magnified ends of subtylostyle 2 depicted in D. F. Sigmancistra. G.SEM of the sponge body and stalk. H. Holotype QM G337468 after fixation. I. SEM image of the styles supporting the membranous ectosome containing the anisochelae. J. SEM image of the stalk showing the membranous anisochelae ectosome over the subtylostyle bundle forming the stalk.
FIGURE 28 in Carnivorous sponges from the Australian Bathyal and Abyssal zones collected during the RV Investigator 2017 Expedition
FIGURE 28. Lycopodina nikitawimandi sp. nov. A. Preserved specimens of paratypes QM G337510 and QM G337534 still attached to the hexactinellid skeleton substrate. Arrows pointing to carnivorous sponges. B. Copepod trapped in isochelae, arrow pointing to the copepod. C. Bottlebrush body of the holotype QM G337534, showing the many filaments and the anisochelae in the ectosome. D. Close-up of the filaments branching from the stem. E. Filaments showing the ectosomal clusters of anisochelae and the underlying mycalostyles. F. Root ball and stem showing the hispid surface from the small mycalostyles.
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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
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International Brain Laboratory public data
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OpenNeuro
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