The Dynamics Of Chronically Bioaccumulated Cd In Rainbow Trout (Oncorhynchus Mykiss) During Both Moderately Hard And Soft Waterborne Exposures,
2010
Wilfrid Laurier University
The Dynamics Of Chronically Bioaccumulated Cd In Rainbow Trout (Oncorhynchus Mykiss) During Both Moderately Hard And Soft Waterborne Exposures, Jessica Milne
Theses and Dissertations (Comprehensive)
Aquatic organisms respond to metal exposures by modulating uptake, elimination and detoxification capacity and, therefore, it is difficult to link accumulation within fish to adverse chronic effects. When fish are exposed to sublethal concentrations of metal, physiological responses follow a damage-repair scenario with rapid uptake into the gills followed by transfer via the circulatory system and accumulation into key organs such as the liver and kidney. Anthropogenic sources of cadmium (Cd) arise mainly from mining, smelting, and refining sulphide ores of Zn, Pb and Cu (Norton et al., 1990). The free divalent ion (Cd2+) is the toxic form …
Dopamine Modulates The Lateral Giant Neuron And Serotonergic Facilitation In Crayfish,
2010
Marshall University
Dopamine Modulates The Lateral Giant Neuron And Serotonergic Facilitation In Crayfish, Joshua Scott Titlow
Theses, Dissertations and Capstones
The lateral giant (LG) neural circuit is a model system used to study the function of individual neurons. The LG circuit is part of a tail flip escape reflex that is a defensive behavior for crayfish. This thesis begins by addressing the effects of dopamine (DA), a neurotransmitter involved in normal and abnormal behaviors of most animals. Here it is shown that dopamine decreases the excitability of the LG neuron, a trigger for the escape reflex. An electrophysiology protocol was used to mimic sensory input to the LG neuron. Stimulating a sensory nerve in the last ganglion with an electrode …
Seasonal Variability In Ichthyoplankton Abundance And Assemblage Composition In The Northern Gulf Of Mexico Off Alabama,
2010
Dauphin Island Sea Lab
Seasonal Variability In Ichthyoplankton Abundance And Assemblage Composition In The Northern Gulf Of Mexico Off Alabama, Frank J. Hernandez, Jr, Sean P. Powers, William M. Graham
University Faculty and Staff Publications
Multiyear ichthyoplankton surveys used to monitor larval fish seasonality, abundance, and assemblage structure can provide early indicators of regional ecosystem changes. Numerous ichthyoplankton surveys have been conducted in the northern Gulf of Mexico, but few have had high levels of temporal resolution and sample replication. In this study, ichthyoplankton samples were collected monthly (October 2004–October 2006) at a single station off the coast of Alabama as part of a long-term biological survey. Four seasonal periods were identified from observed and historic water temperatures, including a relatively long (June–October) “summer” period (water temperature >26°C). Fish egg abundance, total larval abundance, and …
State Of The Fisheries And Aquatic Resources Report 2009/10,
2010
Department of Primary Industries and Regional Development, Western Australia
State Of The Fisheries And Aquatic Resources Report 2009/10, W.J Fletcher, K. Santoro
Status Reports of the Fisheries and Aquatic Resources
As outlined in the CEO’s overview, this year’s renamed State of the Fisheries and Aquatic Resources Report 2009/10 reflects that the Department of Fisheries has now fully adopted an Ecosystem Based Fisheries Management (EBFM) framework as the basis for management of Western Australia’s aquatic resources (Fletcher, et al., 20101). Consequently, the format for this document has been updated so that it is consistent with this risk-based approach to resource management.
Physiological And Toxicological Effects Of Pb Plus Cd Mixtures On Rainbow Trout (Oncorhynchus Mykiss) In Soft Acidic Water,
2010
Wilfrid Laurier University
Physiological And Toxicological Effects Of Pb Plus Cd Mixtures On Rainbow Trout (Oncorhynchus Mykiss) In Soft Acidic Water, Yvonne Kara
Theses and Dissertations (Comprehensive)
The ability of a metal to cause toxicity in aquatic environments is highly dependant upon the water chemistry, which can influence metal bioavailability. Metal bioavailability is affected by the concentration of the metal, complexation of the metal by organic and inorganic ligands, and by the speciation of the metal. Predictive models of metal toxicity, such as the biotic ligand model (BLM) have mainly focused upon predicting the toxicity of individual metals rather than the toxicity of metals in mixtures, which are more commonly found in contaminated waters. Two metals that are commonly found together are Pb and Cd which can …
