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221 results for “Sea Urchin”
Fig. 2. Syndesmis selknami n in Two new species of Syndesmis (Platyhelminthes, Rhabdocoela, Umagillidae) from the sea urchin Pseudechinus magellanicus (Echinodermata, Echinoidea) in the Southwestern Atlantic Ocean
Fig. 2. Syndesmis selknami n. sp. A, D, whole mount preparations. B, C, E, F, sagittal sections of the body. Abbreviations: b, brain; ed, ejaculatory duct; eg, egg; f, filament; fg, filament glands; i, intestine; ov, ovary; sp, sensory pit; sr, seminal receptacle; t, testes; u, uterus; vc, vacuolar cells; vit, vitellaria. The white arrow heads marks the proximal part of the stylet and black arrow heads mark the distal part.
Fig. 2. Araeosoma owstoni Mortensen, 1904. A in A newly recorded sea urchin, Araeosoma owstoni Mortensen, 1904 (Echinoidea; Echinothurioida; Echinothuriidae), from the Korea Strait
Fig. 2. Araeosoma owstoni Mortensen, 1904. A, aboral side; B, oral side. C, tridentate pedicellaria and its valves; D, valves of triphyllous pedicellaria.
Fig. 1 in A newly recorded sea urchin, Araeosoma owstoni Mortensen, 1904 (Echinoidea; Echinothurioida; Echinothuriidae), from the Korea Strait
Fig. 1. Distribution of Araeosoma owstoni Mortensen, 1904. A, collection localities of A. owstoni, A. owstoni bicolor (A. Agassiz and H.L. Clark, 1907) and A. owstoni nudum Mortensen, 1934 from previous studies; B, collecting site of A. owstoni of this study and marked as '★' on the map.
Fig. 8. Syndesmis kurakaikina n in Description and ecophysiology of a new species of Syndesmis Silliman, 1881 (Rhabdocoela: Umagillidae) from the sea urchin Evechinus chloroticus (Valenciennes, 1846) Mortensen, 1943 in New Zealand
Fig. 8. Syndesmis kurakaikina n. sp., sagittal section through posterior body end, at genital pore. Scale bar: 50 μm. B: bursa, EF: egg filament, FA: female atrium, FG: filament glands, CGA: common genital atrium, Gp: gonopore, MA: male atrium, St: stylet, U: uterus, V: vagina.
Fig. 4. Syndesmis kurakaikina n in Description and ecophysiology of a new species of Syndesmis Silliman, 1881 (Rhabdocoela: Umagillidae) from the sea urchin Evechinus chloroticus (Valenciennes, 1846) Mortensen, 1943 in New Zealand
Fig. 4. Syndesmis kurakaikina n. sp., ciliated invagination at the anterior end in sagittal section. Scale bar: 50 μm. Br: brain.
Fig. 2 in Description and ecophysiology of a new species of Syndesmis Silliman, 1881 (Rhabdocoela: Umagillidae) from the sea urchin Evechinus chloroticus (Valenciennes, 1846) Mortensen, 1943 in New Zealand
Fig. 2. Schematic overview of the female reproductive system in Syndesmis. B: bursa, CGA: common genital atrium, EC: egg capsule, FA: female atrium, ID: insemination duct, MA: (entrance to) male atrium, Ov: ovary, Ph: pharynx, St: stylet, SR: seminal receptacle, U: uterus, V: vagina, Vit: vitellaria.
Fig. 12. Syndesmis kurakaikina n in Description and ecophysiology of a new species of Syndesmis Silliman, 1881 (Rhabdocoela: Umagillidae) from the sea urchin Evechinus chloroticus (Valenciennes, 1846) Mortensen, 1943 in New Zealand
Fig. 12. Syndesmis kurakaikina n. sp. A. Mature specimen. B. Posterior end of live mature specimen in the process of laying an egg capsule. C. Entire egg capsule, showing the bulb containing two embryos and the long filament. D. Opened, empty egg capsule post-hatching after two weeks incubation at 21.5 ̊C. E-G. Photomicrographs showing the development from eggs (after one week incubation, E), through zygote (after two weeks incubation, F) to fully developed embryo (after four weeks incubation, G) in an egg capsule from the 14.5 ̊C treatment. H–I. Nonviable (H) and deformed (I) egg capsules from the 25 ̊C treatment. E: egg, EC: egg capsule, EF: egg filament, Em: embryo, Gp: gonopore, Ph: pharynx, Vit: vitellaria, Z: zygote. Scale bars: A = 1 mm, B–C = 100 μm, D-I = 50 μm.
Fig. 10 in Description and ecophysiology of a new species of Syndesmis Silliman, 1881 (Rhabdocoela: Umagillidae) from the sea urchin Evechinus chloroticus (Valenciennes, 1846) Mortensen, 1943 in New Zealand
Fig. 10. Reconstruction of the male reproductive system from a sagittally sectioned specimen of Syndesmis kurakaikina n. sp. Intestine and female reproductive system omitted. Stylet not drawn in its entirety. Scale bar: 200 μm. CGA: common genital atrium, ED: ejaculatory duct, Gp: gonopore, MA: male atrium, T: testis, SD: sperm duct, St: stylet, SV: seminal vesicle.
Fig. 6. Syndesmis kurakaikina n in Description and ecophysiology of a new species of Syndesmis Silliman, 1881 (Rhabdocoela: Umagillidae) from the sea urchin Evechinus chloroticus (Valenciennes, 1846) Mortensen, 1943 in New Zealand
Fig. 6. Syndesmis kurakaikina n. sp., reconstruction of the female reproductive system from a sagittally sectioned specimen. Male reproductive system omitted. Scale bar: 100 μm. B: bursa, BC: bursal canal (simplified), BV: bursal valve, CGA: common genital atrium, DC: ductus communis, EC: egg capsule, IC: insemination canal, In: intestine, FA: female atrium, FG: filament glands, Gp: gonopore, MA: (entrance to) male atrium, Ov: ovary, SRa: anterior part of seminal receptacle, SRp: posterior part of seminal receptacle, U: uterus, Vit: vitellaria.
Fig. 3. Syndesmis kurakaikina n in Description and ecophysiology of a new species of Syndesmis Silliman, 1881 (Rhabdocoela: Umagillidae) from the sea urchin Evechinus chloroticus (Valenciennes, 1846) Mortensen, 1943 in New Zealand
Fig. 3. Syndesmis kurakaikina n. sp., holotype specimen whole-mounted in lactophenol. Differential-interference contrast. Scale bar: 250 μm. B: bursa, EC: egg capsule, FG: filament glands, In: intestine, Ov: ovaria, Ph: pharynx, St: stylet, SR: seminal receptacle, Vit: vitellaria.
Sea urchin roe enahncement data
<p>Data set showing gonad index results for enhancement of sea urchins from four populations over three separate trials</p>
CS6 Sea urchin enhancement Norway - Socio-economic analysis
<p>The dataset builds on dataset for this case study for AquaVitae deliverable D7.3 Profitability analysis, containing cost and profitability data for harvest of sea urchins and for urchin roe enhancement. For Deliverable D7.4 it is enhanced with data on economic multipliers, kelp reforestation data, and socioeconomics, focusing on value added, employment, wages, and economic ripple effects.</p>
Sunflower sea star predation on urchins can facilitate kelp forest recovery
<p>The recent collapse of predatory sunflower sea stars (<em>Pycnopodia helianthoides</em>) due to sea star wasting disease (SSWD) is hypothesized to have contributed to proliferation of sea urchin barrens and losses of kelp forests on the North American West Coast. We used experiments and a model to test whether restored <em>Pycnopodia</em> populations may help recover kelp forests through their consumption of nutritionally poor purple sea urchins (<em>Strongylocentrotus purpuratus</em>) typical of barrens. <em>Pycnopodia</em> consumed 0.68 <em>S. purpuratus</em> day<sup>−1</sup>, and our model and sensitivity analysis shows that the magnitude of recent <em>Pycnopodia</em> declines is consistent with urchin proliferation after modest sea urchin recruitment, and even small <em>Pycnopodia</em> recoveries could generally lead to lower densities of sea urchins that are consistent with kelp-urchin coexistence. <em>Pycnopodia</em> seem unable to chemically distinguish starved from fed urchins and indeed have higher predation rates on starved urchins due to shorter handling times. These results highlight the importance of <em>Pycnopodia</em> in regulating purple sea urchin populations and maintaining healthy kelp forests through top-down control. The recovery of this important predator to densities commonly found prior to SSWD, whether through natural means or human-assisted reintroductions, may therefore be a key step in kelp forest restoration at ecologically significant scales.</p>
CS6 Sea urchin enhancement Norway – Ecosystem service analysis
<p>The dataset builds on dataset for this case study for AquaVitae deliverables D6.2 quantification of ES and D7.4 Socio-economic impact assessment of CSs of new/emerging LTS aquaculture, which in turn built on dataset for D7.3 Profitability analyses. For Deliverable D7.5 it is enhanced with data on ecosystem services related to kelp reforestation and their valuation.</p>
Ocean acidification induces distinct transcriptomic responses across life history stages of the sea urchin Heliocidaris erythrogramma
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Selection shapes the genomic landscape of introgressed ancestry in a pair of sympatric sea urchin species
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Micro-CT data and associated MATLAB scripts from the skeleton of the sea urchin Cidaris rugosa at four different resolutions
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Data from: Artificial light at night and warming impact grazing rates and gonad index of the sea urchin Centrostephanus rodgersii
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Sunflower sea star predation on urchins can facilitate kelp forest recovery
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SBC LTER and MBON: Sea urchin microbiomes in Southern California
Sea urchins are key grazers in coastal seas, where they can survive a variety of conditions and diets, enhancing their ecological impact on coral reefs, kelp forests, and other ecosystems. These data describe a comparative study of the microbiomes of the two dominant sea urchin species in southern California, the red urchin Mesocentrotus franciscanus, and the purple urchin Strongylocentrotus purpuratus across three rocky reef habitats that differed in the types and availability of food resources: kelp forests, urchin barrens and a hydrocarbon seep.
ScienceDex guides
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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.