In recent decades, declining calcium concentrations have been reported throughout lakes across the southern edge of the Canadian Shield. This raises concern as Daphnia populations have shown to be decreasing as they require calcium not only for survival but to mitigate predation…
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Paleolimnology offers insights into long-term perspective in freshwater ecosystems and is useful to fill gaps in historical limnological data. Using multiple indicators to reconstruct ecological trajectory of lakes may strengthen our comprehension of their ecology over long time…
The Carolina Heelsplitter (Lasmigona decorata) is a federally endangered freshwater mussel endemic to North and South Carolina, USA. The species has experienced dramatic range-wide declines as a result of habitat fragmentation and water quality deterioration, and the remaining p…
Climate change is altering thermal regimes in aquatic systems worldwide, often impacting species on the southern edges of their ranges in the northern hemisphere. Yellow Perch, Perca flavescens, a cool water species, have a patchy distribution at the southern edge of their range…
The Caloosahatchee River and Estuary in Southwest Florida has a history of human driven alterations by dredging, channelization, construction of several lock and dams, and an artificial connection to Lake Okeechobee. Water management has changed the quality and quantity of disch…
Climate change is altering freshwater habitats in the United States by increasing water temperatures and changing stream flows. These habitat changes can directly impact survival and geographic ranges of ectothermic freshwater organisms through thermal stress and habitat loss, a…
Shallow lakes are an important ecological and socio-economic resource. However, the impact of human pressures, both at the lake and catchment scale, has precipitated a decline in the ecological status of many shallow lakes, both in the UK, and throughout Europe. There is now, as…
Iceberg calving is an efficient ablation process which introduces mechanical instability to glacier systems and can cause non-linear climatic response. This thesis uses glaciological and limnological data to examine the relative contributions of calving and melting to mass loss …
The floodplains of the Sacramento and Feather River support the largest documented population of Bank Swallows (Riparia riparia) west of the Great Lakes region. Bank Swallows depend upon fluvial geomorphic processes to create and maintain their nesting substrate of steep vertica…
Clean and safe drinking water is a human right. Global, federal, and state agencies that monitor the source and quality of drinking water are limited in power and oversight. Historically, human groups have replaced wetland habitat with cropland, disregarding the abundance of res…
The Amazon River is the world’s largest river by discharge. Its massive delivery of freshwater, carbon, and nutrients to the ocean significantly impacts the ecosystem and air–sea fluxes of carbon dioxide (CO2) in the western tropical North Atlantic Ocean (WTNA). Spatial and temp…
Algonquin Provincial Park (APP), located in south-central Ontario, spans an area of 7,635 km 2 and is a destination for over 800,000 visitors a year. These visitors include cottage owners, as cottages have been leased in APP since the early 1900s. In October 2017, policy makers …
Rivers transform more than half of the organic inputs they receive from terrestrial systems through metabolic processes. In addition to providing the energetic base to sustain stream food webs, these transformations are linked to multiple elemental cycles and result in the relea…
Phosphorus is an essential nutrient that allows life in water to flourish, but changes in phosphorus supplies are not well understood in remote watersheds. In mountain environments, remote watersheds contain critical high-quality water supplies and unique ecosystems, but excess …
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…
Understanding multi-scale population and life history relationships is key to informing management decisions. Abundance and life history relationships can provide insight on a species’ status, population dynamics, recruitment requirements and guide fine scale conservation effort…
Walleye Stizostedion vitreum recruitment in some northern Wisconsin lakes has declined because of recruitment bottlenecks occurring at or before mid-July and these declines have coincided with increases in adult Largemouth Bass Micropterus salmoides abundance. Increased abundanc…
In recent decades, mass loss from glaciers and ice caps (GICs) worldwide has accelerated, contributing significantly to the observed sea–level rise. Their continued melt is also expected to alter local hydrological systems, affecting freshwater availability and quality. Despite …
Cyanobacterial harmful algal blooms (cyanoHABs) are becoming more frequent and intense due to anthropogenic activities. CyanoHABs degrade water quality and impose threats to human and ecosystem health. Yet, we do not fully understand under which circumstances a bloom turns toxic…