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 133 for “"bivalve"”.
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Ecotoxicology of marine biotoxins in bivalve shellfish
A small proportion of harmful algae produce toxins which are harmful to human health. Strict monitoring programmes are in place within Ireland and the EU to effectively manage risk to human consumers of shellfish species that have accumulated marine biotoxins in their tissues. However, little is …
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Interpreting environmental change using bivalve shell geochemistry
To further our understanding of Earth’s climate beyond historical records, a number of paleoclimate proxies are used to infer how climate has changed throughout Earth’s history. Examined herein are two such geochemical proxies—the δ¹⁸O of the shell of the Australian mud or flat oyster, Ostrea …
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Interpreting environmental change using bivalve shell geochemistry
To further our understanding of Earth’s climate beyond historical records, a number of paleoclimate proxies are used to infer how climate has changed throughout Earth’s history. Examined herein are two such geochemical proxies—the δ¹⁸O of the shell of the Australian mud or flat oyster, Ostrea …
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Geotechnical Investigation and Characterization of Bivalve-Sediment Interactions
… with the implementation of self-sustaining bivalve (e.g., mussel, oyster, scallop) farms that could act as mats of interconnected living barriers, protecting the seabed from scour. The mats would help to attract larval settlement by making the substrate a more suitable habitat, contributing …
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Life history traits and population processes in marine bivalve molluscs
… I surveyed the literature on a variety of bivalve species. By incorporating information on growth, survival, and reproduction into matrix population models I could evaluate the relative contributions of these factors to fitness. For broadcast-spawners, long life is an important factor …
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Life history traits and population processes in marine bivalve molluscs
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1998.
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Species-specific patterns in bivalve larval supply to a coastal embayment
… invertebrates. Few species-specific studies of bivalve larvae have been performed due to the lack of suitable methods for species identification. This thesis focused on applying a method to identify larvae from field samples from Waquoit Bay, MA using shell birefringence patterns. This method …
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Seasonal gonadal changes in two bivalve mollusks in Tomales Bay, California
<p>Pododesmus cepio Gray (1850), a bivalve mollusk of Family Anomiidae, is native to the Pacific coast of North America and common in Tomales Bay, California. A small population of the European oyster, Ostrea edulis Linnaeus (1758), is being raised experimentally at the Tomales Bay Oyster Company. …
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Bivalve associations of the Cannonball Formation (Paleocene, Danian) of North Dakota
… 1982, thirteen Cannonball outcrops were studied. Bivalves, along with other macrofossils, were collected quantitatively in an attempt to determine fossil species dominance. Rock samples were also collected and analyzed for textural characteristics and organic carbon content. In addition, R-mode …
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Urban marine bivalve aquaculture: A pathway to enhancing global food security
… and key micronutrients is crucial and marine bivalve molluscs offer an especially attractive solution for delivering this need. However, high quality marine coastal ecosystems, which are required for bivalve spawning and production, are falling under increasing pressures, which include climate …
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Bivalve molluscs as environmental monitors and tools for sustainable water management
… and the human populations that rely upon them. Bivalve molluscs offer particular promise for the biomonitoring of aquatic systems. This thesis seeks to progress understanding and enable wider study of prominent means by which bivalves can, or may yet, provide insights into their environments. …
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Species-specific patterns in bivalve larval supply to a coastal embayment
… invertebrates. Few species-specific studies of bivalve larvae have been performed due to the lack of suitable methods for species identification. This thesis focused on applying a method to identify larvae from field samples from Waquoit Bay, MA using shell birefringence patterns. This method …
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Partitioning along reproductive niche dimensions in sympatric New Zealand freshwater bivalve species
Sympatric species of freshwater mussels in the order Unionida may need to partition resources to enable coexistence due to their relatively sedentary life-style and complex symbiotic life-phase dependent on host-fish. Although new data on their reproductive biology is being increasingly documented, …
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Development, Validation, and Evaluation of a Continuous, Real-time, Bivalve Biomonitoring System
… monitoring tool to assess water quality using bivalve gape behavior was developed and demonstrated. The purpose of this work was to develop methodologies for screening water quality appropriate to the goals of the watershed paradigm. A model of bivalve gape behavior based on prediction of …
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Clams and climate: implications for measuring seasonality in the marine bivalve, saxidomus gigantea
… of seasonal shell growth in select species of bivalves may complement stable oxygen isotope analysis, together providing a more precise paleoclimate reconstruction. This research utilizes the growth of Saxidomus gigantea, abundant both on modern and ancient coastlines to provide information …
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Effects of the 1982-1983 El Niño mega event on bivalve mollusk biomineralization
Marine bivalve mollusks are valued as climate change recorders due to predictable growth rates and the recording of the ambient seawater environment into their shells (e.g., temperature, dissolved inorganic carbon (DIC)). Bivalves that endure extreme environmental perturbations also exhibit …
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Effects of Particle Surface Properties on Feeding Selectivity in Suspension-Feeding Bivalve Molluscs
<p> <p>The mechanisms by which bivalve molluscs differentiate particles are not clearly understood, and the surface properties of a particle have been proposed as factors that contribute to particle selection. The effects of surface properties upon selection by suspension-feeding bivalves were …
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Quantitative Studies of Late Neogene Coastal Environments Using Bivalve Subfossil and Fossil Assemblages
… of a fossil ancestor of an extant mactrid bivalve that is ecologically important in many present-day coastal habitats and well-studied by ecologists and malacologists. The study attempts to quantify morphological effects of environmental changes that occur over geological time scales.
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Microencapsulated diets to improve the productivity of bivalve shellfish aquaculture for global food security
… single largest greenhouse-gas-emitting sector. Bivalve shellfish – including mussels, clams, and oysters – could be an invaluable component of our global food solution. Bivalves are nutrient rich, production has a lower environmental footprint than that of all other animal foods, and developing …
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