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 20 of 32 for “"marine invertebrate"”.
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Characterising Antarctic marine invertebrate microbiomes and their antimicrobial potential
… warming that will negatively impact endemic marine biodiversity. Antarctic marine invertebrates living in the near-shore are likely to be affected profoundly by warming-related changes, and microbes could help their hosts respond to the demands of environmental change. Moreover, their …
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COEXISTENCE, RESILIENCE AND RESISTANCE OF MARINE INVERTEBRATE COMMUNITIES ACROSS A LATITUDINAL GRADIENT
… systems including terrestrial, freshwater and marine. In my dissertation, I explored latitudinal variation in factors that can inform and modify fundamental ecological principles such as coexistence, community stability, and resistance. I studied communities of marine invertebrates across over …
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Marine invertebrate sperm: assessment of sperm quality using computer-aided sperm analysis
The Southern African marine ecosystems are dominated by a variety of marine broadcast spawners. In this study, five species of marine invertebrates, namely Parechinus angulosus (Echinoidea), Choromytilus meridionalis (Bivalvia), Crassostrea gigas (Bivalvia), Donax serra (Bivalvia) and Haliotis …
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Ecology and paleoecology of marine invertebrate communities in calcareous substrates, Northeast Quintana Roo, Mexico
… of Quintana Roo, Mexico, demonstrates that invertebrate death assemblages (i.e., future fossil assemblages) in this region reflect the in-place accumulation of remains of living benthic communities through long periods of time. Samples were collected with a diver-operated suction dredge, and …
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Impacts of ocean acidification on fitness and chemical communication in a model marine invertebrate, Nereis succinea
… enriched to pH 7.8) delays metamorphosis in the marine polychaete, Nereis succinea. Culture in pH 7.8 seawater also caused interference with the reception of chemical cues in this species. Recognition of 3 feeding stimulants (glycine, taurine and fish food extract) was reduced in adult N.succinea …
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Characterisation of a novel bioactive complex polysaccharide from a marine invertebrate with potent anticancer and antimalarial activities
… by the discovery of active compounds from marine organisms. These compounds have a remarkable role in cancer treatment, with fewer side effects on general health. Sulphated glycosaminoglycan (GAGs) are present in all animals, vertebrate and invertebrate. They are of proven economic …
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Initial settlement of marine invertebrate larvae : the role of passive sinking in a near-bottom turbulent flow environment
The hypothesis that planktonic larvae of benthic invertebrates sink through the water like passive particles in turbulent flows near the seabed was tested in the field using several groups of geometrically different sediment trap designs. A priori predictions regarding the rank order that the …
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Tertiary marine prosobranchs: larval dispersal and geographic range
… proposed that extensive larval dispersal allows marine invertebrate species to establish great geographic ranges; several studies along a single margin of an ocean basin have supported this proposal (Shuto, 1975; Hansen, 1978). This study makes use of the fossil record to examine larval dispersal …
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Cretaceous bryozoan fossils from Needs Camp, South Africa
… the Needs Camp fossil deposits lodged in the marine invertebrate collections of the Iziko South African Museum, Cape Town. The approach will be a combination of traditional morphological methods and cutting-edge scanning electron microscopy (SEM) technology. Limestones were dissolved by water, …
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Movement and energetics of swimming marine mollusks
Mollusks constitute a significant proportion of marine animal biomass and fulfill essential ecosystem functions. Yet, our knowledge of their behavior and energy output in natural environments remains elusive. This key knowledge gap stems from our inability to quantify their positions and movements …
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NEARING THE END: REEF BUILDING CORALS AND BIVALVES IN THE LATE TRIASSIC AND COMPARING CORALS AND BIVALVES BEFORE AND AFTER THE END-TRIASSIC MASS EXTINCTION USING A TAXONOMIC DATABASE
… detrimental to the skeletal structures of marine invertebrate such as reef building corals and bivalves. During the Norian and Rhaetian (Late Triassic), corals and bivalves had high diversity and abundance, but like many organisms involved in the mass extinction, quickly disappeared at the …
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NEARING THE END: REEF BUILDING CORALS AND BIVALVES IN THE LATE TRIASSIC AND COMPARING CORALS AND BIVALVES BEFORE AND AFTER THE END-TRIASSIC MASS EXTINCTION USING A TAXONOMIC DATABASE
… detrimental to the skeletal structures of marine invertebrate such as reef building corals and bivalves. During the Norian and Rhaetian (Late Triassic), corals and bivalves had high diversity and abundance, but like many organisms involved in the mass extinction, quickly disappeared at the …
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Transport and retention of benthic marine invertebrates in the Southern Tauranga Basin
… individual and tidal flows. Many coastal benthic marine invertebrate populations have been considered open because of the dispersal potential of a pelagic larval phase, with populations maintained by an external supply of recruits. However, for estuarine populations, recent evidence has suggested …
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Hybridization And Introgression In Marine Invertebrates: Population Genomics Of Phymactis Papillosa And Asterias Sea Stars
… are evolutionary significant processes in marine invertebrates (Sanford & Kelly,2011) yet genome-wide investigations of gene flow in these taxa remain limited relative to vertebrate systems (Marchi et al., 2021). This thesis presents genomic analyses of hybridization and introgression in …
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The Toxicity of Ammonia to Atlantic Silverside (Menidia menidia) and Ghost Shrimp (Palaemonetes pugio)
… water quality criteria for ammonia in the marine environment have been established to protect aquatic organisms from the toxicity of ammonia. Discharge into Chesapeake Bay has not yet been regulated under this criteria. Ammonia limits of 1-2 mg/L total ammonia have been proposed for the …
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Exploring circadian rhythms, food intake, and their interactions in marine invertebrates
… while there are major knowledge gaps for marine invertebrates. My dissertation focuses on the interactions of circadian rhythms and metabolism in three marine invertebrate systems using a combination of behavioral, molecular, and bioinformatic approaches. In Chapter 2, to understand how …
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The search for small molecule inhibitors of histone acetylation
… were discovered in Mycale izuensis, a Japanese marine invertebrate. Azumamides A-E exhibit<br/>nano molar HDAC inhibitory activity and cytotoxic effects. This report details the synthesis of<br/>anacardic acid by Suzuki coupling and the application of the Mitsunobu synthesis to generate …
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Exploring circadian rhythms, food intake, and their interactions in marine invertebrates
… while there are major knowledge gaps for marine invertebrates. My dissertation focuses on the interactions of circadian rhythms and metabolism in three marine invertebrate systems using a combination of behavioral, molecular, and bioinformatic approaches. In Chapter 2, to understand how …
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Evaluating redox cycling across the Toarcian Oceanic Anoxic Event with implications for paleo-environmental reconstructions and organic matter sulfurization
… Earth history, particularly intervals where marine deoxygenation occurred, are crucial to investigating the changes in habitability on Earth. Marine deoxygenation events, in particular, can result in changes in the carbon, sulfur, and iron cycles on our planet. Changes in these elemental …
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