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Full-Text Articles in Biology
Modeling And Mapping Addiction In The Zebrafish, Danio Rerio, Bradley Serpa
Modeling And Mapping Addiction In The Zebrafish, Danio Rerio, Bradley Serpa
Master of Science in Integrative Biology Theses
Driven by the communication of dopamine, the vertebrate reward system has been evolutionarily conserved to maintain survival and optimize fitness. The neural circuits governing this system integrate sensory stimuli to produce appropriate, self-preserving responses that underlie experience-based learning. In the most primitive vertebrates, dopamine release in neuronal circuits drives homeostatic behaviors, such as seeking nutrients, finding a mate, or avoiding danger. From agnathans to mammals, dopaminergic synthesis and signaling genes and molecules, along with neuronal pathways and reward system-based behaviors, remain highly conserved. Dopamine signaling proteins include two classes of metabotropic G-Protein Receptor Coupled Dopamine Receptors, D1-like (DRD1) and D2-like …
The Effect Of Road Crossing On Fish Movements In Small Etowah Basin Streams, Paul D. Benton, William E. Ensign, Byron J. Freeman
The Effect Of Road Crossing On Fish Movements In Small Etowah Basin Streams, Paul D. Benton, William E. Ensign, Byron J. Freeman
Faculty Articles
Increased road construction associated with urbanization may result in fragmentation and loss offish populations in streams. In this study, we documented frequency of movement of fishes through three separate types of road-crossings (clear-span bridges, box culverts, and tube culverts) in six small streams using mark-recapture sampling. Upstream movement between areas separated by either box or tube culverts was lower than upstream movement between similar areas not separated by a road crossing. Downstream movement between areas separated by box culverts was also lower than downstream movement between areas without obstructions. Upstream and downstream movement between areas separated by clear-span bridges was …
Investigating Hydrologic Alteration As A Mechanism Of Fish Assemblage Shifts In Urbanizing Streams, Allison H. Roy, Mary C. Freeman, Byron J. Freeman, Seth J. Wenger, William E. Ensign, Judith L. Meyer
Investigating Hydrologic Alteration As A Mechanism Of Fish Assemblage Shifts In Urbanizing Streams, Allison H. Roy, Mary C. Freeman, Byron J. Freeman, Seth J. Wenger, William E. Ensign, Judith L. Meyer
Faculty Articles
Stream biota in urban and suburban settings are thought to be impaired by altered hydrology; however, it is unknown what aspects of the hydrograph alter fish assemblage structure and which fishes are most vulnerable to hydrologic alterations in small streams. We quantified hydrologic variables and fish assemblages in 30 small streams and their subcatchments (area 8-20 km 2) in the Etowah River Catchment (Georgia, USA). We stratified streams and their subcatchments into 3 landcover categories based on imperviousness (20% of subcatchment), and then estimated the degree of hydrologic alteration based on synoptic measurements of baseflow yield. We derived hydrologic variables …