Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 8 of 8 for “"Cartilaginous fish"”.
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From brain development to reproductive axis: an integrated study of the nervous system in cartilaginous fish
Cartilaginous fishes (Class Chondrichthyes), including sharks, rays, and chimaeras, represent one of the oldest extant vertebrate lineages, with origins exceeding 400 million years. Despite their ecological importance and key phylogenetic position, major gaps persist in our understanding of their …
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Characterization of the Whale Shark (Rhincodon Typus) Melanocortin-2 Receptor
… Previous studies on the MC2R orthologs of select cartilaginous fish, the elephant shark (<em>Callorhinchus milii</em>) and the red stingray (<em>Dasyatis akajei</em>), revealed divergent traits in a less obligatory relationship on MRAP1 and its ability to be activated by ACTH or the MSH-sized …
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Exploring the TE landscape of elephant and CR1 accumulation, evolution and effects of selection in the class Chondrichthyes
… Here, we investigate the TE landscape of a cartilaginous fish, the elephant shark, ensuring the accurate annotation of this genome using a combination of sequence-homology and manual curation. We discovered that much of the genome (29%) was composed of non-LTR retrotransposons such as SINE …
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The evolution and function of pharyngeal arch signalling centres in jawed vertebrates
… either side of the embryonic vertebrate head. In fishes, endodermal pouches fuse with surface ectoderm to form gill slits. Once delineated, pharyngeal arches undergo morphogenesis and differentiation, giving rise to skeletal elements of the jaw and gills (in fishes), or the jaw, ear and throat (in …
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Axial patterning of the chondrichthyan pharyngeal endoskeleton and the origin of the jaw
… condition. To do this, I have used embryos of a cartilaginous fish, the little skate (Leucoraja erinacea), which has retained an ancestral organisation of the jaw and gill arch endoskeleton, and which possesses a reduced gill-like structure (a “pseudobranch”) on the back of the mandibular arch. …
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DNA+eDNA: integration of traditional and emerging tools for monitoring marine ecosystems
… revealed cryptic speciation, and informed fisheries management by delineating stock boundaries, tracking movements, and assessing reproductive strategies like multiple paternity. Moreover, genetic tools can help assess population vulnerabilities, providing vital data for conservation …
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Analisi della variabilità genetica e della connettività tra popolazioni di due specie di Elasmobranchi: Raja clavata L.,1758 e Scyliorhinus canicula (L., 1758)
… the status of conservation and exploitation of cartilaginous fish are essential to better understanding the biology and degree of threat of this important taxonomic group, that takes on great importance for his ecological role in the control of coastal and oceanic ecosystems. Taking into account …
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La riproduzione dei condroitti come elemento chiave per la loro conservazione e gestione nel Mediterraneo centro-occidentale
… resilient to the high rates of mortality due to fishing (Musick, 1999; Cortés, 2002; Dulvy and Forrest, 2010). The knowledge of the biological parameters related to the reproductive biology (life-history traits) and the state of the populations of these marine organisms are essential to plan …