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72 results for “medusa”
Data from: Ecological drivers of jellyfish blooms – the complex life history of a 'well-known' medusa (Aurelia aurita)
<ol> <li>Jellyfish blooms are conspicuous demographic events with significant ecological and socio-economic impact. Despite worldwide concern about an increased frequency and intensity of such mass occurrences, predicting their booms and busts remains challenging.</li> <li>Forecasting how jellyfish populations may respond to environmental change requires considering their complex life histories. Metagenic life cycles, which include a benthic polyp stage, can boost jellyfish mass occurrences via asexual recruitment of pelagic medusae.</li> <li>Here we present stage-structured matrix population models with monthly, individual-based demographic rates of all life stages of the moon jellyfish <i>Aurelia aurita</i> L. (<em>sensu stricto</em>). We investigate the life stage-dynamics of these complex populations under low and high food conditions to illustrate how changes in medusa density depend on non-medusa stage dynamics.</li> <li>We show that increased food availability can be an important ecological driver of jellyfish mass occurrences, as it can temporarily shift the population structure from polyp- to medusa- dominated. Projecting populations for a winter warming scenario enhanced the booms and busts of jellyfish blooms.</li> <li>We identify demographic key variables that control the intensity and frequency of jellyfish blooms in response to environmental drivers such as habitat eutrophication and climate change. By contributing to an improved understanding of mass occurrence phenomena, our findings provide perspective for future management of ecosystem health.</li> </ol>
Medusa
NES - Castlevania - Medusa Source: Objaverse 1.0 / Sketchfab
Medusa
La rivière (The River, Der Fluss) by Aristide Maillol (1861-1944), Jardin de Sculptures (Brussels) , Royal Museums of Fine Arts of Belgium, Brussels, Belgium. Made with CapturingReality. Thanks "mprove" for the information. For more updates, please consider to follow me on Twitter at @GeoffreyMarchal. Source: Objaverse 1.0 / Sketchfab
FIGURE 2. Lafoeina amirantensis. Nematocysts. A in Lafoeina amirantensis (Cnidaria: Hydrozoa, Campanulinoidea), the hydroid stage of the medusa Cirrholovenia tetranema (Cnidaria: Hydrozoa, Lovenelloidea)
FIGURE 2. Lafoeina amirantensis. Nematocysts. A) Microbasic mastigophore of umbrella of newly released medusa. B) Atrichous isorhiza from polyp column. C) Basitrichous isorhiza from polyp tentacle. D) Basitrichous isorhiza from medusa tentacle. E) Atrichous isorhiza (arrows) from medusa tentacle bulb. F) Microbasic mastigophore from nematophore. Scale bar = 10 µm.
FIGURE 3. Lafoeina amirantensis. A–E in Lafoeina amirantensis (Cnidaria: Hydrozoa, Campanulinoidea), the hydroid stage of the medusa Cirrholovenia tetranema (Cnidaria: Hydrozoa, Lovenelloidea)
FIGURE 3. Lafoeina amirantensis. A–E) Newly released medusae. A) Specimen with 2 tentacles and 2 cirri, oral view. B) Specimen with 2 tentacles and 6 marginal cirri, oral view, C) Detail of margin. Note the swelling where the perradial tentacle will be formed. D) Detail of margin. E) Detail of stomach and gonads, aboral view. F–H) 1dayold medusae. Note the presence of 4 tentacles. Scale bar = 0.1 mm.
FIGURE 1. Lafoeina amirantensis. A in Lafoeina amirantensis (Cnidaria: Hydrozoa, Campanulinoidea), the hydroid stage of the medusa Cirrholovenia tetranema (Cnidaria: Hydrozoa, Lovenelloidea)
FIGURE 1. Lafoeina amirantensis. A) Part of a colony on seaweed. Note the tiny nematophores (arrows). B) Detail of a nematophore with a bundle of undischarged microbasic mastigophores nematocysts. C) Planuloid. D) Hydranth and nematotheca. E–G) Hydrotheca, SEM preparations. E) Lateral view. Note longitudinal depressions along distal part. F) Operculum, oral view. G) Operculum, lateral view. Note that it is not segmented, but a continuation of the hydrothecal wall which folds upon itself. Scale bars: A = 0.4 mm; B = 0.01 mm; C = 0.2 mm; D = 0.1 mm; E = 0.04 mm; F = 0.02mm.
FIGURE 4. Medusa stage. A–C in Rediscovery and redescription of Hybocodon chilensis Hartlaub, 1905 (Cnidaria: Hydrozoa) from Comau Fiord, southern Chile
FIGURE 4. Medusa stage. A–C: Newly liberated medusa in lateral (A), basal (B) and apical (C) view; scale bar 500 µm. D: Intermediate stage of medusa development (subadult medusa), from plankton; scale bar 1 mm. E: Mature medusa; scale bar 1 mm. F: Mature medusa from life; scale bar 0.5 mm. G–I: Tentacle bulb in external (G), internal (H) and basal (I) view; scale bar 0.5 mm.
FIGURE 1 in The hydroid and medusa of Amphinema rollinsi (Cnidaria: Hydrozoa), a new species of pandeid from the Monterey Bay Submarine Canyon, USA
FIGURE 1. Hydroid of Amphinema rollinsi, sp. n.: A. Upright hydrocaulus. B. Mature hydranth. C. Medusa bud nearly ready for release. Scale bar A = 5mm. Scale bars B and C = 500µm.
FIGURE 2 in The hydroid and medusa of Amphinema rollinsi (Cnidaria: Hydrozoa), a new species of pandeid from the Monterey Bay Submarine Canyon, USA
FIGURE 2. Medusae of Amphinema rollinsi, sp. n. A. Newly released medusa. B. Mature female medusa. Scale bars = 1mm.
FIGURE 1 in The life cycle of Eucheilota medusifera? (Torrey, 1902), comb. nov. [= Campalecium medusiferum] (Cnidaria: Hydrozoa: Lovenellidae) from the Bay of Biscay (northeastern Atlantic), including a description of the adult medusa
FIGURE 1. Eucheilota medusifera? (Torrey, 1902). A) Hydrothecae and a developing gonangium; note the accumulation of cnidocysts in the distal end of the latter. B) Hydrotheca and stolon; a new hydranth is budding. C) A detail of the intertentacular web showing the typical sausage-like cnidocysts; these may be lacking in some polyps. D) Sausage-like merotrichous haploneme. The real armature of this cnidocyst very likely consists of a dextral helix of two or three separate strands of small spines with several coils; there could be minute spines in the distal tube as well. Scale bar: 100 µm (A, B); 21 µm (D); C, not at scale.
FIGURE 3 in The life cycle of Eucheilota medusifera? (Torrey, 1902), comb. nov. [= Campalecium medusiferum] (Cnidaria: Hydrozoa: Lovenellidae) from the Bay of Biscay (northeastern Atlantic), including a description of the adult medusa
FIGURE 3. Eucheilota medusifera? (Torrey, 1902). Adult medusa (30 days old), height= 1.8 mm; width= 4.0 mm.
FIGURE 2 in The life cycle of Eucheilota medusifera? (Torrey, 1902), comb. nov. [= Campalecium medusiferum] (Cnidaria: Hydrozoa: Lovenellidae) from the Bay of Biscay (northeastern Atlantic), including a description of the adult medusa
FIGURE 2. Eucheilota medusifera? (Torrey, 1902). Newly released medusa. A) A specimen seen from above (exumbrellar cnidocysts not drawn). B) Side view; note the equatorial band of cnidocysts. C) A perradial bulb; note the rudimentary developing cirrus in the right side of the bulb. Three kinds of cnidocysts can be seen: minute atrichous isorhizas in the tentacle, merotrichous haplonemes in the bulb and basitrichous haplonemes in the exumbrella. D) A developing perradial bulb with lateral cirrus and the typical terminal cluster of merotrichous haplonemes. E) An interradial thickening with central cirrus. F) Exumbrellar basitrichous haploneme (frontal and side views) and a small merotrichous haploneme of the cirri. Adult medusa. G) Umbrellar margin with a statocyst with six statoliths in a single row forming a semicircle. Scale bar: 66 µm (C, D, E); 20 µm (F); B, width= 725 µm; height= 640 µm; A, G, not at scale.
FIGURE 3 in Voragonema tatsunoko (Trachymedusae: Rhopalonematidae), a new species of benthopelagic medusa, host to the hyperiid amphipod Mimonectes spandli (Physosomata: Mimonectidae)
FIGURE 3. (A) Lateral view of the holotype of Voragonema tatsunoko [2K1337SS6g], collected at 15:18:15; scale: 1 mm. (B) detail of the bell margin of the paratype [2K1337SS6h], from the external surface showing the proximal part of the autotomized marginal tentacles superimposed in several rows together; scale: 1 mm.
FIGURE 2 in Voragonema tatsunoko (Trachymedusae: Rhopalonematidae), a new species of benthopelagic medusa, host to the hyperiid amphipod Mimonectes spandli (Physosomata: Mimonectidae)
FIGURE 2. Lateral views of the holotype of Voragonema tatsunoko [2K1337SS6g], collected at 15:18:15, under darkfield illumination (A) and transmitted light (B), and the paratype [2K1337SS6h] under transmitted light after removal of the parasitoid amphipod (C). Note the striations on the external surface of the exumbrella (A), reminiscent of those in Crossota rufobrunnea (Kramp, 1913); scale: 10 mm.
FIGURE 1 in Voragonema tatsunoko (Trachymedusae: Rhopalonematidae), a new species of benthopelagic medusa, host to the hyperiid amphipod Mimonectes spandli (Physosomata: Mimonectidae)
FIGURE 1. Specimen of Voragonema tatsunoko with the hyperiid amphipod Mimonectes spandli Stephensen and Pirlot, 1931 attached [paratype: 2K1337SS6h]. Specimen collected at 15:24:36 above muddy sediment in Suruga Bay at 1967 m depth on 7 April 2002 and photographed in an aquarium on board ship. Voragonema tatsunoko: lateral (A), apicolateral (B), and oral (C) views; scale: 10 mm.
Medusa Gorgon
Medusa Gorgon Source: Objaverse 1.0 / Sketchfab
FIGURE 4. Corymorpha balssi Stechow, 1932, preserved specimens. A. Hydranth showing blastostyles bearing medusa buds. B in On some tropical hydroids (Cnidaria: Hydrozoa), with descriptions of four new species
FIGURE 4. Corymorpha balssi Stechow, 1932, preserved specimens. A. Hydranth showing blastostyles bearing medusa buds. B. Dissected blastostyle with medusa buds at various stages of development; largest bud ready to be liberated. C. Basal view of a medusa bud at two focus depths, to show the velum (left) and the tentacles with packed nematocysts (right); the capitate tentacle is above and the large, opposite tentacle is below; note the relative smaller size of the lateral tentacles compared to the latter. Scale bars: A–C = 200 µm.
GEOLAB - Transnational Access project JELLYFISh - Field testing of Medusa DMT
<p>The project <strong>JELLYFISh</strong> <em>(<strong>A Just-released innovativE in-situ soiL testing technoLogY (Medusa DMT/SDMT) For enhancing the resilience of the critical InfraStructure in Europe</strong></em><em>)</em> aims to contribute to the advancement of knowledge on geotechnical characterization of soil deposits commonly encountered in risk-sensitive areas (intermediate soils, soft clays, quick clays, loose sands), often associated to multiple geo-hazards that may negatively interact with CI networks. Improvements in geotechnical approaches to analysis and mitigation of such hazards, in order to increase the resilience of the CI, rely significantly on enhanced characterization of soil behaviour.</p> <p> </p> <p>The methodology employed for this purpose is the innovative Medusa (S)DMT in-situ soil testing technology. The research project is based on an extensive experimental in-situ testing program with Medusa (S)DMT in different soil types at benchmark Geo-Test Sites (NGTS), part of the research infrastructure managed by the NGI. A comprehensive high-quality soil database, including data from field and laboratory tests, published articles and reports, is available from NGI. The sites (target soil types) that were recognized of specific interest for this project are Halden (silt), Onsøy (soft clay), Tiller-Flotten (quick clay), and Øysand (sand).</p> <p>The project benefits from the collaboration of users from industry and academia, making use of the access to the GEOLAB facility to test and implement new technology solutions. The relevant Technology Readiness Level (TRL) of the project is in the group (TRL4-7), pertaining to technology development of solutions to enhance the resilience of the CI.</p> <p> </p> <p>The main objectives of the project and their significance in terms of innovation / advancement of knowledge are:</p> <ul> <li>Innovative approach for characterizing the in-situ behaviour of intermediate soils by Medusa DMT tests at variable pressurization/penetration rates, in combination with available data from variable-rate CPTU tests.</li> </ul> <ul> <li>Advancement in soil property characterization of soft clay deposits by innovative in-situ testing procedures (e.g., in-situ horizontal stress / coefficient of earth pressure at rest <em>K</em><sub>0</sub> from continuous measurement of total horizontal pressure during Medusa DMT penetration).</li> <li>Novel approach for mapping quick clay layers by innovative in-situ testing procedures (continuous measurement of total horizontal pressure during Medusa DMT penetration).</li> <li>Improvement of DMT interpretation in sand, including the investigation of the effect of fines content and partial drainage (to be introduced into DMT-based simplified methods for liquefaction assessment).</li> </ul>
FIGURE 4. Bulbophyllum medusae. A. Flowering plants. B. Flattened plants. C. Inflorescence. D in New orchids in the flora of Vietnam VIII (Orchidaceae: Epidendroideae, tribes Malaxideae, Neottieae and Podochileae)
FIGURE 4. Bulbophyllum medusae. A. Flowering plants. B. Flattened plants. C. Inflorescence. D. Floral bracts, adaxial and abaxial side. E. Flower, side view. F. Median sepal, adaxial and abaxial side. G. Lateral sepals, adaxial and abaxial side. H. Petals, adaxial and abaxial side. I. Lip, views from different sides. J. Ovary, lateral sepal, column, column foot and lip, side view. K. Ovary, column, column foot and lip, side view. L. Ovary, column and column foot, side, half-side and front view. Photos by Truong Ba Vuong from living plant prior to the preparation of the voucher herbarium specimen Truong Ba Vuong, BV 1715. Photo correction and design by L. Averyanov and T. Maisak.
FIGURE 3 in The hydroid and early medusa stages of the deep sea jellyfish Earleria purpurea (Hydrozoa: Mitrocomidae) from the Monterey Bay Submarine Canyon, USA
FIGURE 3. Medusa stages of Earleria purpurea; a newly released medusa, b 8-tentacle stage medusa, c 16-tentacle stage medusa, d 32-tentacle stage medusa; scale bar = 2mm.
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