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.
Results
Showing 1 to 20 of 147 for “"bivalves"”.
-
The extinction of the rudist bivalves
The rudist bivalves were one of the many and varied groups of organisms to be extinguished at the end of the Cretaceous Period. They were a group of bivalves which evolved during Late Jurassic times to dominate the carbonate shelves on the margins of the Tethys Ocean during the Cretaceous Period. …
-
Comparative morphology and phylogeny of anomalodesmatan bivalves
… ancient and ecologically diverse group of marine bivalves, but are nonetheless inconspicuous in most extant shallow water communities. For various reasons, which include their present scarcity and a bewildering array of disparate morphologies, representatives of the group have always proved …
-
Evolution of gender associated mitochondrial DNA in bivalves
<p>Bivalves of the families Unionidae and Mytilidae possess a unique mode of mitochondrial DNA inheritance dubbed sex-limited mitochondrial DNA (mtDNA) inheritance or doubly-uniparental inheritance (DUI). In contrast to the matrilineally restricted inheritance of mtDNA in other metazoans, these …
-
Middle and Upper Jurassic bivalves from the Iberian Range (Spain)
Previous work on Jurassic bivalves from the Iberian Range is reviewed, whereby emphasis is placed on Callovian-Kimmeridgian species. The taxonomy, distribution pattern and ecology of the bivalve fauna occurring in Middle and Upper Jurassic rocks of the Aragonian Branch of the Iberian Range have …
-
The evolution of extreme longevity in modern and fossil bivalves
… mollusks may provide an avenue to do just that. Bivalves, much like trees, record their size at each year of life in their shells. In other words, bivalve shells record not only lifespan, but also growth rate. Being abundant both on the surface of the planet today, and in the geologic record, …
-
Tīmata whakaora, kickstarting recovery - Using bivalves to bioremediate degraded estuarine sediments
… (chronic) stress. In the first experiment bivalves were added to defaunated plots in single and combined species treatments and compared to ambient and defaunated no-addition controls. Measurements were taken over a period of 389 days (one year) and included influence of bivalve additions …
-
Microevolutionary patterns in some Jurassic bivalves of the Oxford Clay, England
Over 10,000 bivalves were collected to investigate the microevolutionary patterns in the Peterborough Member of the Oxford Clay Formation. Two main bivalve lineages were studied <i>Meleagrinella braamburiensis</i> and <i>Mesosaccella morrisi</i>. <i>M. braamburiensis</i> was a thin-shelled …
-
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
… 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 end of the Triassic. In the early Jurassic, very few …
-
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
… 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 end of the Triassic. In the early Jurassic, very few …
-
Biomonitoramento e ecotoxicologia de metais pesados através de moluscos bivalves em ecossistemas estuarinos
… do uso de organismos vivos. Diversas espécies de bivalves são utilizadas em programas de biomonitoramento, sendo que no Brasil, ostras do gênero Crassostrea e mexilhões como Perna perna e Mytilus edulis são empregados com maior frequência. Bivalves são organismos filtradores e possuem a capacidade …
-
Phenotypic Plasticity in Economically and Ecologically Important Bivalves in Response to Changing Environments
Marine bivalves are ecologically important, providing ecosystem services like filtering water, stabilizing substrate, and creating hard structure for epibionts. Cultured bivalves are also economically important, supporting thousands of aquaculture jobs nationwide and providing valuable protein …
-
Molecular detection of the apicomplexan parasite 'X' (APX) in bivalves in New Zealand
The flat oyster (Bluff oyster, dredge oyster) Ostrea chilensis is an iconic seafood species in New Zealand that forms the basis of one of the oldest commercial fisheries in the country and is under development for aquaculture. However, the productivity of commercially important flat oyster …
-
Factors influencing the uptake and fate of metallic nanoparticles in filter-feeding bivalves
… aquatic biota, such as filter- feeding bivalves, which ingest and accumulate a broad range of dissolved- and particulate-phase contaminants. The present study describes a comprehensive approach to prepare and rigorously characterize MetNP test suspensions to facilitate fundamental …
-
Étude des cils et des mucocytes de la surface abfrontale des branchies de bivalves
… abfrontale des branchies de huit espèces de bivalves, représentant sept familles et les quatre principaux types de branchies : Mytilus edulis, Modiolus modiolus, Arca zebra (Filibranch, branchie homorhabdique), Placopecten magellanicus (Filibranch, branchie hétérohabdique), Crassostrea …
-
Application of NMR-based metabolomics techniques to biological systems: a case study on bivalves
… of NMR-based metabolomics to the study of bivalves, facing challenges of interest in both food and environmental sciences. The outcome of such studies yield insights, at molecular level, into several aspects concerning the impact of different storage conditions on shellfish quality and the …
-
Environmental Change Impacts on Marine Calcifiers: Spatial and Temporal Biomineralisation Patterns in Mytilid Bivalves
Environmental change is a major threat to marine ecosystems worldwide. Understanding the key biological processes and environmental factors mediating spatial and temporal species’ responses to habitat alterations underpins our ability to forecast impacts on marine ecosystems under any range of …
-
From ecology to the assessment of multiple ecosystem services; a case study of estuarine bivalves
… between multiple ES provided by marine bivalves and the implications for management. In data-scarce marine environments, conventional spatial methods for assessing ES interactions and bundles are not always feasible. However, advancements can be made by focussing on ecological …
-
A Descriptive Survey of Freshwater Unionidae Bivalves in Five Creeks Located in West Central Georgia
<p>A descriptive survey of the West Georgia, Chattahoochee River drainage unionid bivalve fauna inhabiting Mountain Oak, Mulberry, Standing Boy, and Upatoi Creeks has been completed. The survey is intended to determine whether Unionidae populations remain extant in this portion of the Chattahoochee …
Page 1 of 8