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Full-Text Articles in Physical Sciences and Mathematics
A Tangle Net Study On Relative Abundance And Habitat Preference Of Elasmobranchs In North Inlet Estuary, South Carolina, Moriah Heather Moore
A Tangle Net Study On Relative Abundance And Habitat Preference Of Elasmobranchs In North Inlet Estuary, South Carolina, Moriah Heather Moore
Electronic Theses and Dissertations
Although habitat selection is relatively well studied in some elasmobranchs, no field or lab studies have focused on sediment preference, which is important to other benthic marine vertebrates. To determine the relative abundance and sediment preference of shallow water benthic elasmobranch inhabitants of North Inlet, SC, we employed 187 30 minute tangle net sets over two sediment types (mud and sand). The majority of our capture consisted of 41 Dasyatis sayi (tagged 37) and 31 Sphyrna tiburo (tagged 14). Although D. sayi had been recorded in North Inlet, previous studies found greater numbers of congeners D. americana and D. sabina. …
Assessing Allelopathic Effects Of Alexandrium Fundyense On Thalassiosira Sp., Emily R. Lyczkowski
Assessing Allelopathic Effects Of Alexandrium Fundyense On Thalassiosira Sp., Emily R. Lyczkowski
Electronic Theses and Dissertations
Production of allelopathic chemicals by the toxic dinoflagellate Alexandrium fundyense is one suggested mechanism by which this relatively slow grower outcompetes other phytoplankton, particularly diatoms. Despite well documented allelopathic potential of Alexandrium spp., the potency is variable. To further characterize allelopathic effects of A. fundyense on diatoms in the Gulf of Maine, I studied growth and nutrient acquisition by the chain-forming diatom Thalassiosira sp. in the presence and absence of allelochemicals. Thalassiosira cells, upon exposure to filtrate of A. fundyense cultures exhibited “bleaching” and both growth and nutrient utilization ceased for up to 4 days compared to controls. Results from …
Polychaete Burrowing Behavior In Sand And Mud, Kevin Terrence Du Clos
Polychaete Burrowing Behavior In Sand And Mud, Kevin Terrence Du Clos
Electronic Theses and Dissertations
Marine sediments are continually reworked by resident organisms that control the ecology, chemistry, and physical structure of these vast systems. For example, the creation of a burrow brings oxygenated water into contact with anoxic sediment, facilitating aerobic respiration and supporting a distinct population of bacteria and meiofauna. Collectively, the effects of infauna on sediments and pore waters are known as bioturbation. Studying the behavior organisms that live beneath the sediment surface (infauna) is crucial to understanding the effects of bioturbation. Infauna can be difficult to study, however, because much their activity cannot be directly observed. The purpose of this thesis …
Circulation And Transport In Casco Bay, Maine, Gregory H. Sinnett
Circulation And Transport In Casco Bay, Maine, Gregory H. Sinnett
Electronic Theses and Dissertations
General circulation and transport exchange within Casco Bay, Maine occurs primarily through the three deepest channels separating the interior sections of the Bay from the outer Bay and adjacent Western Gulf of Maine shelf. Resource management in Casco Bay relies on an ability to predict and/or track oil spill trajectories, Red Tide events, nutrient plumes, pollution and other factors important to the estuarine environment. However, the exchange through these channels, the mean circulation and associated forcing mechanisms are not well understood. In this study, time series of current velocities, temperature, salinity and wind data collected during 2004 and 2005 are …