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 70 for “"Clams"”.
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Nitrogen Excretion in Freshwater Clams
No abstract prepared.
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Drag coefficients on razor clams in slightly fluidized granular media
Razor clams are able to burrow deeply into granular media with only a small fraction of force required by traditional anchoring devices. It is hypothesized that the collapse of their shell and subsequent localized fluidization of the media is responsible for a large reduction in drag, thereby …
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Enhanced Blue Crab Predation on Rangia Clams after Exposure to Hypoxia
… and episodic hypoxia. Mature common rangia clams (Rangia cuneata) are not found within this zone. Blue crabs (Callinectes sapidus) are important estuarine predators and may move in and out of the hypoxic zone to feed on hypoxia-stressed rangia clams. To test the effects of hypoxia on …
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Clams and climate: implications for measuring seasonality in the marine bivalve, saxidomus gigantea
… lines confirmed by oxygen isotope analysis. Clams collected from Alaska grew a total of 143±34 days while the Canadian clams grew 273±14 days. Additionally, oxygen isotope values were more positive from annual winter growth lines from Alaskan samples than Canadian samples. This method was …
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Effects of heavy metals on the physical activity and survival of freshwater clams
… project, I investigated whether freshwater clams (Musculium spp.) could be appropriate bioindicators for monitoring water quality in the CDA drainage. In a field-caging assay along the polymetallic gradient in the drainage, clam survival was significantly higher in the unpolluted portion of …
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Pismo Clams (Tivela stultorum) in Califorina: Population Status, Habitat Associations, Reproduction, and Growth
… status, reproduction and growth. Pismo clams (<em>Tivela stultorum</em>) are a culturally important and iconic species in California, which supported a thriving commercial and recreational fishery throughout much of the 1900’s. However, Pismo clam populations have declined statewide in …
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The Effect of Dieoffs of Asian Clams (Corbicula fluminea) on Native Freshwater Mussels (Unionidae)
… production and dissolved oxygen levels. Only clams at the highest density of 10,000/m2 experienced 100% mortality. Unionized ammonia levels exceeded 4.0 mg/L, and dissolved oxygen levels dropped below 1.0 mg/L during the dieoff. The amount of unionized ammonia produced was twofold greater than …
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Life history and microbiome analysis of freshwater fingernail clams (sphaeriidae) exposed to trace metal pollution
… the life histories of freshwater fingernail clams (Sphaeriidae) and if fingernail clams are selecting a different microbial community if chronically exposed to metal mixtures than if in a site that is not impacted by metal pollution. Fingernail clams are small, cosmopolitan, sedentary, …
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The design of a compliant underwater angle sensor to investigate the kinematics of burrowing razor clams
… analyzing the precise burrowing motions of razor clams in order to aid in the development of intelligent anchoring devices. The angle sensor was developed using a set of specific functional requirements, theoretical kinematic and structural models, and an iterative prototyping process. The …
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Effect of storage temperatures on the microbiological quality, safety, and viability of quahog clams, Mercenaria mercenaria
… safety, and viability of hard shelled quahog clams. Samples were stored at four different incubation temperatures (3.3, 7.2, 10.0, and 12.S0C) for a period of three weeks, following their harvest from growing waters during the summer when the water temperatures were ~ SO°F, and during the …
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The design of a fluidized bed for testing of a robotic burrowing device which mimics razor clams
… a burrowing device based on Atlantic Razor Clams. This test bed allows for in-lab testing in an environment covered by water, eliminating the need to test in the mud flats where razor clams live. Between each RoboClam test, water is pumped through a distributor plate, which suspends and …
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Toxicological, physiological, and behavioral responses of the Asiatic clam, Corbicula sp., to biocidal and copper perturbations
… dry weight index, and siphoning activity) of clams during 30-day laboratory artificial stream studies. Studies also were conducted comparing sublethal responses (e.g., glycogen, tissue water, soluble protein, and siphoning activity) of clams to copper, a component of power plant effluents, …
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Characterizing the effects of ocean acidification in larval and juvenile Manila clam, Ruditapes philippinarum, using a transcriptomic approach
… sequencing and RNA sequence analysis in larval clams revealed several physiological processes that play important roles in the Manila clam’s ability to tolerate elevated pCO2 conditions during this life stage. Exposure of juvenile Manila clams, acclimated to elevated pCO2 conditions, to a …
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Functional and pathological responses of selected aquatic organisms to chrysotile asbestos
… responses of larval, juvenile, and adult Asiatic clams (Corbicula sp.), juvenile and adult fathead minnows (Pimephales promelas), and egg, larval and juvenile Japanese Medaka (Oryzias latipes) to chrysotile asbestos were investigated in 96-hour to 91-day tests. Chrysotile significantly reduced …
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Polyethylene passive samplers for measuring hydrophobic organic chemical concentrations in sediment porewaters and their use in predicting bioaccumulation in soft-shell clams (Mya arenaria) from sites near Boston, MA
… in sediments and the tissues of soft shelled clams (Mya arenaria) , in order to measure bioaccumulation potential. First, the use of PE passive samplers, in-situ, to measure freely dissolved HOC concentrations, is demonstrated. PRCs, impregnated into the PE before use, allow porewater …
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An Ecotoxicological Recovery Assessment of the Clinch River Following Coal Industry-related Disturbances in Carbo, Virginia (USA): 1967-2002
… in survivorship and growth of field-caged Asian clams (Corbicula fluminea) at sites downstream of the CRP. More importantly, these results indicated renewed toxicity in CRP effluent. Additional transplant studies using two enclosure types were conducted to isolate effects attributable to CRP …
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Cellulolytic responses to heavy metal accumulation in Corbicula fluminea and Mudalia dilatata
… and generally at 0.025 to 1.0 mg zinc/L. Clams detected acute lethal levels of metal and used valve closure as an avoidance mechanism for 14 days. Snails, however, did not effectively avoid exposures and were more sensitive to acute stress during all exposures. These behavioral responses …
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Evidence of Multidecadal Recruitment in the Ocean Quahog, <i>Arctica islandica</i> in the Western Atlantic Ocean
… stock to evaluate long-term recruitment trends. Clams were sectioned for age estimation to develop population age frequencies. Initial colonization began approximately 175-250 years ago depending upon site. All sites experienced an increase in recruitment beginning in the late 1800’s to early …
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Aspects of the biology of Mya arenaria and Ensis spp. (Mollusca; Bivalvia) in the Irish Sea and adjacent areas
… spp. at Oxwich (Wales), and the pathology of all clams was examined using both histological and molecular methods. No pathogenic conditions were observed in M. arenaria while Prokaryote inclusions, trematode parasites, Nematopsis spp. and inflammatory pathologies were observed at low incidences in …
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Trends in Eukaryote Body Size in an Ecological and Evolutionary Context
… body size was that spionid mudblister infested clams from one environment were slightly, yet significantly, smaller than their non-infested counterparts. The most obvious pattern regarding body size was that clams from a lagoon were significantly larger than clams from a tidal creek. This size …
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