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 85 for “"molluscs"”.
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Life history traits and population processes in marine bivalve molluscs
In this thesis, I investigated the how the life history characteristics of the clam Mya arenaria determine the population response to chronic contaminant exposure. To predict the potential responses of a broadcast-spawning life history such as that of M. arenaria, I surveyed the literature on a …
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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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Bivalve molluscs as environmental monitors and tools for sustainable water management
… 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. Production …
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Selected molluscs as monitors of metal pollution in coastal marine environments
The potential of bivalve molluscs as monitors of metal pollution in South African coastal marine environments has been investigated using the species Crassostrea gigas, Crassostrea margaritacea, Perna perna and Choromytilus meridionalis. Metal concentrations in these and other species living along …
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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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Of Molluscs and Men: Pearling Labour and Environments in the Indian Ocean 1880-1925
This dissertation studies three pearl fisheries in the northern Indian Ocean – the Persian Gulf, the Gulf of Mannar, and the Mergui Archipelago – at the height of the global pearl boom in the late nineteenth and early twentieth centuries. Based on archives in the Emirates, India, Myanmar, Sri …
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Isolation and characterisation of novel glycosaminoglycan-like polysaccharides derived from marine molluscs with antiproliferative activity
Although various anticancer therapeutic tools have been launched, such as immunotherapy and targeted therapy, newly developed drugs with antiproliferative/cytotoxic effects are still in demand; hence, newly discovered anticancer drugs with an improved pharmacological profile are needed to overcome …
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A new sabellid that infests the shells of molluscs and its implications for abalone mariculture
Infestations of sabellid polychaetes were found in South African farmed abalone in 1994. Growth experiments confirmed that infested abalone had reduced growth rates. Surveys of both the intertidal and subtidal region at various locations around the South African coastline revealed that the sabellid …
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Re-examining the relationships among families of Pectinoidea and molecular machinery of the visual cycle in molluscs
… photosensitivity across animals. However, molluscs, the second largest animal phylum, have been largely ignored in these studies despite possessing morphologically diverse eyes. Here, I investigated three levels of biological organization in molluscan eyes: organs, pathways, and proteins. I …
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A geochemical and paleoceanographic investigation using marine molluscs of the late Quaternary marine submergences Quebec, Ontario, British Columbia
… of chernlcal1y unaltered aragorlitlc molluscs can be used to determine paleoter1-lperatures and paleosallnltles." HO\Never} corrections need to be tllade \fvtlen deterrTIlnlng oxygen-isotope paleotenlperi:ttures due to the lnfluence of isotopically 11gtlt glaciol rneltv-laters and …
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Molluscan paleontology of the Pliocene Peace Valley "beds" and Ridge Route "formation" (Ridge Basin group), Ridge Basin, southern California
… of the Peace Valley "beds" was examined for molluscs along the northeastern side of the basin and more than 600 m of section were measured.</p> <p>The nonmarine molluscs of the Ridge Route "formation" and Peace Valley "beds" consist of ten species: one unionid, Anodonta oregonensis (Lea); …
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Taxonomia, morfologia e distribuição geográfica das espécies incluídas em Hypselartemon Wenz, 1947 (Mollusca, Gastropoda, Pulmonata, Streptaxidae)
… family, constituted by carnivorous land snails molluscs, has circuntropical distribution and is strongly represented in Brazil, with an estimative of 60 living species described. Taxonomic and morphological problems embracing the Brazilian species are still common, making the specific …
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UTTERBACKIA IMBECILLIS (BIVALVIA: UNIONIDAE) AS A BIOLOGICAL INDICATOR OF COPPER POLLUTION
… aquatic pollutant that is particularly toxic to molluscs.
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Environmental and climatic aspects of the early to mid Holocene calcareous tufa and land mollusc fauna in southern Sweden
… on the postglacial immigration of terrestrial molluscs into Sweden. The chronology was based on pollen stratigraphical correlation and radiocarbon dating. Tufa formation was found to have occurred at several sites during the early Preboreal and Boreal [11,500-7,800 calibrated years BP (cal. …
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A genetic and morphological analysis of species complexes within the genus Patella
… of the genus Patella are very common intertidal molluscs that have a widespread world-wide distribution. Despite this, the systematics of the genus is still in a state of confusion. However, in comparison to other regions, the southern African representatives of Patella are fairly well …
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Paleogeography and Paleoenvironments of the Lower Unit, Fossil Butte Member, Eocene Green River Formation, Southwestern Wyoming
… contain well preserved fossil fish, ostracodes, molluscs and the kerogen that was produced mainly by algae. These rocks grade towards the margins into micrites that become more bioturbated closer to the margin of the lake, as well as into ostracodal and gastropodal limestones. Nearshore …
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Nachweis und Differenzierung von Vibrio sp. in Krusten- und Schalentieren und Erzeugnissen daraus unter besonderer Berücksichtigung der routinemäßigen Diagnostik
… Differentiation of Vibrio sp. in Crustaceans, Molluscs, and Products thereof with Regard to Routine Diagnostic The purpose of this study was to reveal the contamination rate by vibrios of commercially available crustaceaens, and molluscs, and products thereof. Beside this, a simple quick …
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Rare and problematic taxa from the Much Wenlock Limestone Formation
… mariae gen. et sp. nov., rostroconch molluscs, machaeridians and cornulitids. Six species of asteroids are recognized, including three new forms (Palasterina orchilocalia sp. nov., Hudsonaster? carectum sp. nov., and Doliaster brachyactis gen. et sp. nov.), that show a diverse range of …
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