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 256 for “"mussels"”.
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Freshwater Mussels as Biofilters
Freshwater mussels (Bivalvia: Unionidae) are filter feeders, removing phytoplankton and other suspended particulate matter from the water. The removal of suspended matter from water is often considered desirable, in order to reduce algal blooms and in the treatment of drinking water. This thesis …
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Flatworm Predation on Juvenile Freshwater Mussels
… benthic species, feeds on juvenile freshwater mussels in fish hatcheries and mussel culture facilities. Laboratory experiments were performed to assess the predation rate of M. tuba on newly transformed juveniles of plain pocketbook mussel, Lampsilis cardium. Predation rate at 20°C in dishes …
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Energy Reserves in Native Freshwater Mussels (Bivalvia:Unionidae) with and without Attached Zebra Mussels: Effects of Food Deprivation
… of salvaging zebra mussel-infested freshwater mussels from their native habitat by determining 1) how zebra mussel infestation affects unionid feeding and body condition, 2) how starvation in quarantine affects body condition of unionids, and 3) what feeding regime maintain unionid condition in …
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Byssus Production in Freshwater Mussels (Bivalvia: Unionoidea)
Freshwater mussels (Order Unionoida) are a widespread and ecologically significant group of bivalve mollusks that are particularly diverse in North American rivers. Mussels are patchily distributed, but can be very abundant in suitable habitat and dense multispecies aggregations known as "mussel …
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Crayfish Predation on Juvenile Freshwater Mussels (Bivalvia: Unionidae)
North American native freshwater mussels are among the most endangered faunal groups in the world. Juvenile mussels are very small and potentially vulnerable to a wide variety of predators, including crayfish. This study examines predation by a native crayfish, Orconectes neglectus on juvenile …
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Parasites in freshwater mussels: community ecology and conservation
… system: the ecosystem-engineering freshwater mussels (Unionida) and their macroparasites. As such, this thesis has three broad aims: to characterise knowledge to date on unionid mussel parasite communities and develop tools to further knowledge in this area; to analyse the drivers of parasite …
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Propagation of Juvenile Freshwater Mussels (Bivalvia: Unionidae) and Assessment of Habitat Suitability for Restoration of Mussels in the Clinch River, Virginia
… of a pond and raceway for rearing juvenile oystermussels (Epioblasma capsaeformis) and wavyrayed lampmussel (Lampsilis fasciola). This experiment was prematurely terminated due to predation on mussels by fathead minnows (Pimephales promelas). Experiment 2 evaluated growth and survival of juvenile …
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Population trends and ecological community interactions of freshwater mussels
Freshwater mussels (order Unionida) are a globally widespread taxon which have been described as ecosystem engineers due to their capacity to modify freshwater habitats and facilitate other taxa, with effects on wider biodiversity. At the same time, freshwater mussels rank among the most threatened …
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Development of a diet for rearing juvenile freshwater mussels
Over 100 species of freshwater mussels (Unionidae) are endangered or threatened in the United States, and another dozen species support a declining commercial harvest of shells for the cultured pearl industry in Asia. Because of these Significant declines in abundance, a study was undertaken to …
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Immunological responses of fishes to glochidia of freshwater mussels
… glochidia and post-infestation juvenile mussels are antigenically different.
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Population Genetic Structure of Unionid Mussels Across Multiple Gulf Drainages
Understanding patterns of genetic differentiation within and across wildlife populations is a key component to parsing the demographic and ecological processes that govern the spatial structure and evolutionary trends of a given species. As molecular and computational techniques continue to …
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Copper exposure of freshwater mussels (Anodonta anatina): Some physiological effects
… with suspended food particles. Freshwater mussels living at the interface of the free-flowing water and the sediment phase can take up copper directly from the water or by consumption of lower trophic level organisms laden with copper. For mussels, copper is essential at low concentration …
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Host Specificity of Freshwater Mussels: a Critical Factor in Conservation
Freshwater mussels have a unique life cycle in which they parasitize a fish host during their larval stage. While fish hosts of many mussel species have been identified, little is known of variation in host-specificity among populations, within species. I investigated host compatibility in two …
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Invisible invasion: finding Perna viridis amongst South African green mussels
… harbours, ten sites were chosen and all green mussels were collected. A phylogenetic analysis of the mitochondrial cytochrome c oxidase subunit 1 gene (mtDNA COI) using ten mussels from five of the harbours was performed using the Tamura-3-parameter model to create a Neighbour-Joining tree. A …
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Development of an Algal Diet for Rearing Juvenile Freshwater Mussels (Unionidae)
… days old, 50-53 days old, and 3-6 years old. The mussels were fed an algal diet consisting of Scenedesmus quadricauda (22.3 - 44.5 μm), Nannochloropsis oculata (2.8 – 8.1 μm), and Selenastrum capricornutum (3.6 – 8.5 μm) in equal cell densities. The change in relative abundance of each algal …
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Evaluation of Diet, Gametogenesis, and Hermaphroditism in Freshwater Mussels (Bivalvia: Unionidae)
… effects of different algal diets on freshwater mussels, tissues of Elliptio complanata were sampled for physiological, somatic, and gametogenic condition from August 1999 to May 2000. Treatments included mussels fed Scenedesmus quadricauda (S), Neochloris oleoabundans (N), a no feed treatment …
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Freshwater Mussels Vary in Substrate Preference and Mobility in Pairwise Behavioral Experiments
Freshwater mussels are a highly imperiled group of organisms that are sensitive to environmental stressors such as drought, flooding events, and global warming. While most mussels are considered to have broad sediment tolerances, some species are micro-habitat specialists. Mussel mobility can vary …
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The Effect of Flow on Burrowing in Juvenile Freshwater Mussels (Bivalvia, Unionidae)
… significant factor in the survival of freshwater mussels; it helps to prevent dislodgement from the sediment, and it reduces the risk of predation. In this study the burial time and orientation of juvenile mussels were tested in response to flow and substrate in a recirculating flow tank. Two …
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Aspects of stress with particular reference to mytilid mussels and their parasites
… male Choromytilus (P = 0.02). Longer surviving mussels had fewer cysts; this suggests that these parasites constitute a somatic stress. Metacercaria columbinesis sp. nov., a zoogonid, was found in 28.6% of Mytilus. The fellodistomid Metacercaria maculatopsis sp. nov. occurred in 0.4% of …
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Resolving the evolutionary history of multiple groups of freshwater mussels (Bivalvia : Unionidae).
Freshwater mussels are a group of aquatic invertebrates comprised of approximately one thousand species worldwide, and the greatest diversity of freshwater mussels lies within North America with at least three hundred species. The high level of biodiversity in this group is strongly shaped by a …
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