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.
Results
Showing 1 to 20 of 64 for “"Biology, Oceanography"”.
-
Microbial Communities of Healthy and Diseased Corals
The extent of phenotypic plasticity in the corallite morphology of colonies of M. annularis s.s. was determined by analyzing the three-dimensional morphology of calical surfaces and the two-dimensional corallite morphology as represented in transverse thin sections. Significant phenotypic …
-
Analyses of Organic Halogen Compounds in Marine Organisms
Made available in DSpace on 2014-12-10T23:24:35Z (GMT). No. of bitstreams: 1 7500468.pdf: 6438115 bytes, checksum: 03979e7270c8aa602e4edcdf27208e59 (MD5) Previous issue date: 1974
-
Sexual selection and biological diversification: Patterns and processes
This dissertation investigates the evolutionary consequences of three very different behavioral mechanisms by which males may bias female mating decisions in their favor, elaborate male displays (Chapters I and II) and sexual coercion and resource brokering (Chapter III). The results presented here …
-
Freezing avoidance and the presence of ice in shallow water Antarctic fishes
Fishes inhabiting ice-laden waters of McMurdo Sound, Antarctica, have ice present on all external tissues. This includes the integument, gills, and intestinal tract. With one exception, all internal tissues and fluids including the heart, liver, red muscle, white muscle, blood, bile, urine and …
-
Advances in the isotopic analysis of biogenic phosphates and their utility in ecophysiological studies of aquatic vertebrates
Distinguishing marine and freshwater animals in the fossil record is a long-standing problem in paleontology. The physiological tolerances of extinct animals usually are inferred from environmental indicators and/or on the physiology of nearest living relatives. These types of evidence are often …
-
Linking Prey to Predator: Scale Dependence and Oceanographic Influence in Marine Food Webs
<p>Increased pressure has been placed on researchers to focus on processes at an ecosystem level. However, ecological processes operate at multiple scales from an individual predator up to ocean basin migrations, and research across these scales is extremely difficult. More accurate and detailed …
-
Ecotoxicology of Natural and Anthropogenic Extreme Environments
<p>Reactive oxygen species (ROS) are produced endogenously in all aerobes and are induced by environmental stressors. ROS oxidize and disable essential cellular components such as DNA, proteins, and lipid membranes. Exposure to metals, polycyclic aromatic hydrocarbons (PAHs), and some pesticides …
-
The Growth and Bioenergetics of <i>Callinectes sapidus</i> Larvae and the Effects of Diet Quality on Larval Physiology
<p>Food quality, especially ω3 polyunsaturated fatty acids (PUFA), can affect the physiology and metabolic efficiency of larvae of the blue crab, <em>Callinectes sapidus</em>. These affects may correlate with success in development and juvenile recruitment.</p> <p>Larvae were exposed to two diets …
-
Seasonal and Mesoscale Variability in the Distribution of Antarctic Krill, <i>Euphausia superba</i>, West of the Antarctic Peninsula
<p>Observations collected between November 1991 and September 1993 during four multidisciplinary cruises were analyzed to provide a description of seasonal and mesoscale variability in the distribution and abundance of Antarctic krill, Euphausia superba, within continental shelf waters west of the …
-
The Photosynthetic Action Spectra of the Phytoplankton and Their Role in Governing Spatial and Temporal Distribution: A Numerical Modeling Approach
<p>In the present study a numerical modeling approach is employed to examine the role of division spedific differences in photosynthetic action spectra in governing the relative size of diatom and dinoflagellate carbon synthesis along various marine light regime gradients. A radiative transfer …
-
Production of Copper-Complexing Ligands in Response to Elevated Concentrations of Copper in Marine <i>Synechococcus</i> spp.
<p><em>Synechococcus</em> spp. (marine cyanobacteria) are extremely sensitive to copper toxicity and can produce high-affinity ligands of unknown structure which form complexes with free cupric ion. These ligands may contribute to the biological control of the levels of free cupric ions in surface …
-
Characterization of Antibiotic Resistance in <i>Vibrio cholerae</i> Isolated From Ships' Ballast and Other Environmental Sources
<p>Ships' ballast has been implicated as a vector in the dispersal of invasive species into new environments. Numerous cases have been documented for the introduction of macroorganisms via ballasting operations, but what is less known is the role of ballast water and residuals in the spread of …
-
Age, Growth, and Reproduction of Vermilion Snapper (<i>Rhomboplites aurorubens</i>) in the North-Central Gulf of Mexico
<p>Vermilion Snapper is a commonly harvested species of reef fish in the northern Gulf of Mexico (GOM). It supports both a large commercial and popular recreational fishery, however knowledge of this fish’s life history is limited spatially. Non-linear curve fitting was used to estimate growth …
-
Nutrient Controls Over Cyanobacterial Synthesis of the Neurotoxin β-N-Methylamino-L-Alanine (BMAA) and Its Potential Accumulation in the Blue Crab (<i>Callinectes Sapidus</i>)
<p>Cyanobacteria are known to produce a variety of toxins that negatively impact both aquatic and terrestrial organisms. One putative neurotoxic compound is the non-protein amino acid β-N-methylamino-L-alanine (BMAA), which has epidemiological linkages to the development of several human …
Page 1 of 4