Sixty one year old (S1) and sixty two year old (S2) Atlantic salmon smolts derived from comparable egg stocks, were dye-marked and their growth and development individually monitored in a seawater cage for a period of 26 months. During that time, blood samples were withdrawn at …
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Freshwater ecosystems have been degraded and lost over time due to a variety of anthropogenic stressors. Within the Great Plains of North America, the agriculturalization of the landscape has led to the widespread degradation and loss of aquatic habitat. Oxbows are naturally occ…
This dissertation investigates the ecology and distribution of amphibians, parasites, and their interactions within aquatic ecosystems. Throughout my dissertation, I use quantitative tools and field observations to examine the factors limiting distributions of amphibians and the…
Owen Sound Bay, which is located within the traditional territory of the Saugeen Ojibway Nation (SON), is contaminated as a result of historical industrial and shipping activity. Gross contamination of the sediments in the inner part of the Bay (i.e., Owen Sound Harbour) include…
Desert fishes are some of the most threatened species in the world because of anthropogenic alterations and competition for limited freshwater. Among threatened desert fishes is the Yaqui Catfish, Ictalurus pricei , which is native to southwest United States and northwestern Mex…
The Spring River, located within the Interior Highlands, supports one of the most biodiverse fish faunas (137 species) within Arkansas. However, threats to the fish communities include chronic pasture land-use and potential fish introductions from farm ponds within the watershed…
Bivalve shellfish aquaculture provides many benefits to society, beyond their traditional market value. This thesis reviews and collates the evidence and valuations available on the provisioning, regulating and cultural ecosystem services provided by bivalve aquaculture species.…
Evidence is presented that fish populations globally are susceptible to endangerment through exploitation and habitat loss. Theoretical simulations are presented to explore how reduced adult survival (age truncation) might affect short-lived freshwater fish species in human-alte…
Many marine species make use of the expanse of the ocean by traveling great distances to fulfill life history requirements. The blacktip shark, Carcharhinus limbatus, is a medium sized species associated near the coast found circumglobally in temperate waters. In the northwester…
Yellowtail snapper Ocyurus chrysurus is an important fisheries species in the US Caribbean; in waters of Puerto Rico, it ranks second for reef fishes in terms of annual total commercial landings. However, a paucity of information exists concerning basic life history information …
Over the last century, there has been a shift in the United States population towards a more urbanized environment, with the vast majority of Americans (~80%) now living in urban areas. This has caused an alteration in recreational interests, as participation rates associated wi…
Nervous systems have evolved to combine environmental information with internal state to select and generate adaptive behavioral sequences. To better understand these computations and their neural implementation, natural behavior must be carefully measured and quantified. Here w…
Population collapse in forage fish occurs both naturally and due to overfishing, and is a challenge to sustainable fisheries management. Sustained low abundance can result in prolonged fishery closures and impact the abundance of other species via predation or competition. The t…
Teleost fishes occupy a range of ecosystem and habitat types subject to large seasonal fluctuations. Strategies for surviving theses seasonal environments can vary widely and are commonly accompanied by variation in brain structure. However, our understanding of how predictable …
The shellfish aquaculture industry has been identified as a sustainable source of protein to feed a growing global population. Absorption of carbon dioxide (CO2) by the world’s oceans is leading to a decline in ocean pH, resulting in process termed ocean acidification (OA), and …
In the United States, the Magnuson-Stevens Reauthorization Act mandates that all federally fished species must have catch limits, which can be challenging for data-limited species. One approach is to assess and manage a group of species with similar life history characteristics,…
An imperiled population of endemic North American Burbot (Lota lota maculosa) inhabiting the lower Kootenai River in a transboundary region of Idaho and British Columbia struggles with recruitment failures linked to incompatibility between early life history patterns and upstrea…
I investigated habitat use and age estimation methods for juvenile tarpon (Megalops atlanticus) to better understand use of natural and managed habitats in coastal South Carolina and to provide guidance for estimating life history characteristics that are dependent on age data. …
Biogeographic barriers have limit the movement of organisms, leading to speciation and shaping the development of unique regional biotas. Human-aided circumvention of biogeographic barriers, however, has increased the connectivity of isolated biotas, while changes in climate hav…