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Showing 1 to 17 of 17 for “"echinoid"”.
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Exploring the morphospace of cidaroid echinoid spines.
Crown group cidaroids (Echinodermata: Echinoidea: Cidaroida) display a variety of spine morphologies thought to be adapted in response to selective pressures around them. Echinoid spines directly interact with their surroundings and morphologies should reflect environmental conditions changing …
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On the Role of Rna in Early Echinoid Embryogenesis
Made available in DSpace on 2015-05-13T22:12:01Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6808227.PDF: 5116316 bytes, checksum: 9fb4c3da184acd9aeacdba181ad45847 (MD5) Previous issue date: 1967
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The echinoid Parechinus angulosus and its association with other invertebrates
Echinoids are recognized as important components of temperate kelp forests because of the impact that they have by grazing. The provision of shelter by some echinoid species for both juvenile conspecifics and for other species of echinoids has been widely documented. The behaviour is thought to be …
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A Phenotypic And Genetic Characterization Of The Cell Adhesion Molecules Echinoid And Friend-Of-Echinoid In The Directed Cell Movements Of Ommatidial Rotation During Drosophila Eye Development.
… the roles of two cell adhesion molecules, Echinoid: Ed) and Friend-of-Echinoid: Fred), in this process. Initially, I characterized the misrotation phenotypes resulting from loss-of-function mutations in these two genes, and used a genetic approach to ascertain that they function during …
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Taphonomy and Palaeoecology of multi-element skeleton invertebrates: a genetic model for exceptional preservation
… skeleton invertebrates, such as arthropods and echinoids, were studied. The first case studied concerns the Ordovician trilobite-like arthropod Tariccoia arrusensis, which is found locally within the grey siltstones of Riu Is Arrus Member (Monte Argentu Formation, Upper Ordovician), cropping out …
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Role of the mGRIP1 homologue DGrip in the Drosophila neuromuscular system
… der PDZ Domänen unterdrückt werden kann. Echinoid, ein wichtiger Regulator der EGFR-Signalkaskade, wurde hier als Interaktionspartner identifiziert. Bindet Echinoid an die PDZ Domänen 1 und 2, wird die DGrip-abhängige Muskellenkung reprimiert. Erfolgt hingegen die Bindung an PDZ 7, kann …
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The foraging strategy of Diadema antillarum (Philippi) (Echinodermata: Echinoidea)
<p>Diadema antillarum (Philippi) is a common echinoid grazer in Caribbean reef areas. Field observations in st . Croix, u.s.v.r. an.d Disc. overy Bay, Jamaica and laboratory experiments demonstrate that these urchins have a strong feeding preference for algal turf. Seasonal variation in the …
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Comparação interpopulacional de caracteres morfológicos e reprodutivos do ouriço-do-mar Arbacia lixula (Linnaeus, 1758) (Echinodermata: Echinoidea) em duas localidades do litoral do estado do Rio de Janeiro
Arbacia lixula (Linnaeus, 1758) is a common echinoid on the Brazilian coast, although there are few studies about this species in the South Atlantic Ocean. This work aims to compare morphological and reproductive traits in two sea urchin populations and verify the reproductive cycle of Arbacia …
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The Trophic Ecology of Psammechinus miliaris in Scottish Sea Lochs
… ecosystem functioning and as such regular echinoids have been termed keystone through the action of their grazing. Much research has focused on this group’s action as herbivores, but as a group omnivory is common. The aim of this study was to investigate the trophic ecology of the locally …
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Evaluating the resilience of Antarctic echinoderms to Southern Ocean freshening: Short- and long-term responses
… a methodology was developed using the temperate echinoid Echinus esculentus, which showed distinct short- and long-term metabolic responses to low salinity. Experimental data demonstrated that E. esculentus could acclimate to moderate salinity reductions, with thresholds identified between 21‰ …
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ECOLOGY OF ROCKY SUBTIDAL COMMUNITIES: THE ROLE OF MODIOLUS MODIOLUS (L) AND THE INFLUENCE OF DISTURBANCE, COMPETITION, AND MUTUALISM
… maintaining them. Bivalve, ophiuroid, and echinoid prey outside, but not inside, Modiolus beds were consumed by fish, crab, and lobster predators demonstrating that Modiolus beds provide a refuge from predation. The sea urchin Strongylocentrotus droebachiensis was the most significant agent …
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Systematics and biodiversity of South African sea urchins
The South African Echinoidea (Echinodermata) were last reviewed by Clark & Courtman Stock (1976) and numerous unidentified specimens and records have accumulated since that time, plus there have been many taxonomic changes within the group. Therefore this study, which forms the first of its kind in …
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Studies of the Hippo Signaling Pathway
… Through this screen, I have found that Echinoid (Ed), an immunoglobulin domain-containing cell adhesion molecule, acts as an upstream regulator of the Hpo pathway. Loss of Ed compromises Yki phosphorylation, resulting in elevated Yki activity that drives Hpo target gene expression and …
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Towards Deep-Sea Toxicology: Experimental Approaches With Echinoderms
… with two<br/>species of shallow-water echinoid, the eurytopic Psammechinus miliaris and the stenotopic<br/>Brissopsis lyrifera. A range of biomarkers was used to assess the responses of the echinoids to<br/>contaminant exposure. Compared with the significant cytological and molecular …
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Development of scientifically base management towards a sustainable fishery of the common sea urchin, Paracentrotus Lividus, in Sardinia
… Paracentrotus lividus is the main echinoid consumed in Mediterranean and Atlantic Europe. France is the world’s second largest consumer of sea urchin. In Italy, sea urchin fisheries occur in the South and the Islands. Recent studies suggest that the risk of collapse of the sea …
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Sedimentology, Diagenesis and Reservoir Characteristics of Eocene Carbonates Sirt Basin, Libya
… bioclasts, cementation (syntaxial overgrowths on echinoid grains, and blocky to equant, non-ferroan cements), neomorphism, pressure dissolution, compaction and fracturing. δ18O and δ13C values in the Gialo Formation range between -1.06 and -4.16‰ PDB, and 0.76 and 1.89‰ PDB, respectively. These …
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The use of ULVA as a feed supplement in the development of an artificial diet and feeding regimes to produce export quality roe from the sea urchin Tripneustes gratilla (Linnaeus)
… gratilla is a fast growing, shallow water echinoid, which occurs across the Indo-Pacific, with its south-western limit in warm, temperate waters of South Africa. The success of T. gratilla cultivation depends, in part, on the development of a high quality, costeffective, gonad-conditioning …