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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 72 for “"Mollusks"”.
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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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Some Fossil Mollusks of Yakima County, Washington
… the correlation and interpretation of the fossil mollusks.
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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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Holocene Mollusks of the Knife and Heart Rivers, Southwestern North Dakota
… North Dakota, at least 15 species of aquatic mollusks were found. From 4 fossil sites on the same river, at least 17 species of aquatic mollusks were found in addition to 11 species of fossil terrestrial gastropods. From 18 collecting sites in the Heart River, southwestern North Dakota, at …
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Analysis of D-amino acid-containing neuropeptides in mollusks and rodents
Modern mass spectrometry (MS)-based neuropeptidomics continues to reveal an unprecedented level of chemical complexity in the nervous system on the peptide level, with sometimes hundreds of peptides expressed by or secreted onto specific structures. These neuropeptides have evolved for animal …
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Fresh Water Mollusks of the Grassy Butte Area McKenzie County, North Dakota
<p>Eight molluscan species consisting of 92 specimens from six localities in the Grassy Butte area of North Dakota are here identified and located stratigraphically. The genera identified are Viviparus, Lioplacodes, Campeloma, and Reesidella. These fauna come from the Tongue River formation and the …
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Biodiversity and Biogeography of Deep-Sea Gastropod Mollusks from the Pacific Costa Rica Margin
… diversity and biogeography of deep-sea gastropod mollusks from hydrocarbon seeps at the Pacific Costa Rica Margin to understand what factors lead to the generation and maintenance of novel biodiversity at chemosynthesis-based ecosystems in the ocean. The Pacific Costa Rica Margin was extensively …
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Fort Union (Paleocene) mollusks from southern Golden Valley and southeastern Billings counties, North Dakota
<p>Nine molluscan species are known to occur in Tongue River Sentinel Butte sediments of parts of Billings, Golden Valley, and Slope Counties in southwestern North Dakota. Tongue River sediments contain all nine of the species which include: two unionids, Plesielliptio priscus (Meek and Hayden) and …
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It’s clam-plicated: how functional traits influenced extinction patterns of Neogene West Atlantic mollusks
Because mollusks are not only indispensable members of marine ecosystems, but are also essential human food sources throughout much of the world, their patterns of survival under future anthropogenic climate change conditions must be predicted in order to focus conservation efforts. Bivalves and …
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Mollusks from Wisconsinan (Pleistocene) ice-contact sediments of the Missouri Coteau in central North Dakota
… extent) in central North Dakota.</p> <p>Fossil mollusks, contained in sediments deposited in contact with the stagnant ice at 40 sites, are represented by 23 species including polecypods of the families Unionidae and Sphaeriidae and gastropods of the families Valvatidae, Hydrobiidae, Physidae, …
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Modeling the Biogenic Effects of Freshwater Mollusks on Bedload Transport and Dynamics in a Gravel-Bedded Stream
Application of physical modeling in relation to the influence of ecosystem engineers such as the freshwater mussel has been a common source of interest in ecohydrogeomorphic literature, limited by methods and complexity of application. This thesis investigates the influence of biogenic variables on …
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Historical and contemporary distributions of aquatic mollusks in the upper Conasauga River system of Georgia and Tennessee
… within the Mobile basin drainage for freshwater mollusks. The Conasauga River historically supported 37 species of unionids (Bivalvia: Unionidae), 11 species of prosobranch gastropods (Mollusca: Gastropoda), and 3 species of sphaerid (Bivalvia: Sphaeridae) clams. I collected records from several …
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Methodological advances for the measurement of the D-amino acids across the metazoa: From mollusks to man
… nervous and endocrine systems of animals, from mollusks to man. Regarding the goal of developing approaches for D-amino acid analysis, chiral separations involving capillary electrophoresis and liquid chromatography have been developed and characterized. Capillary electrophoresis paired with …
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Effects of sewage treatment plant effluents on mollusks and fish of the Clinch River in Tazewell County, Virginia
… raising concern because of the disappearance of mollusks below existing STP's. Field and laboratory studies were conducted to determine mollusk and fish distribution in proximity to two STP's in Tazewell County, and the tolerance of two mollusk species to mono chloramine and unionized ammonia, …
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Developing cultivated mollusks through establishing primary cell culture methods of Eastern Oyster, Crassostrea virginica, as a model bivalve
… no continuous cell lines of food-relevant mollusks have been established so far. This study used the adult Eastern Oyster, Crassostrea virginica, as a model bivalve to study the decontamination, cell dissociation, and culture conditions suited for mollusk adductor muscle cells. Oyster …
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The Wandering Mussels: Analyzing the Ecological Impact of Dreissenid Mollusks Across Spatial and Temporal Scales in Eastern Ontario Using Environmental DNA
Biological invasions profoundly disrupt aquatic ecosystems, yet predicting their long-term trajectories remains challenging. To address this, I propose the Alien Succession Hypothesis (ASH), a novel theoretical framework conceptualizing biological invasions as a form of ecological succession …
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Food Habits of Fish In A Multispecies Farm Pond
… South Dakota. Aquatic insects, zooplankton, mollusks, and fish were the most frequently consumed food items by the three species. Yellow perch led primarily on aquatic insects, zooplankton, and mollusks. Aquatic insects were dominant (by volume) in 40.0 and 61.5 percent of the samples …
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Integrating Taxonomic Meta-Analysis and Mussel Physiology to Assess Secondary Salinization in Appalachian Headwaters and Urban Streams
… 62% of amphibians and insects, 56% of mollusks and crustaceans, and 51% of fishes. However, the diverse study designs and ionic concentrations hindered generalizable comparisons across taxa. My first objective was to expand the existing review by calculating population-level effect …
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