Cultural eutrophication of Lower Saint Regis Lake using diatoms and organic content as indicators of eutrophication.
Tue, 04/28/2020 - 12:06
Abstract: Cultural eutrophication can greatly affect water quality, leading to algae blooms and can affect fish communities. Throughout the history of Paul Smith’s Hotel and College, development along Lower St. Regis lake has led to increases in eutrophic conditions, which has detrimental effects on water quality. In this study, a sediment core from Lower St. Regis Lake was analyzed to determine when past eutrophication events occurred. This was accomplished using species counts of diatoms from every 1.0 cm of sediment. The relative abundance of diatom species such as Tabellaria flocculosa, Asterionella formosa, and Fragilaria crotonensis were used as indicators of more eutrophic conditions. Loss on ignition (LOI) was also used to measure the organic content in the sediment at increments of 0.5 cm. The higher percent lost on ignition indicates higher productivity in the lake and more eutrophic conditions. Some samples from the sediment core were also dated using lead-210 to create a timeline that could be compared to known dates of events occurring along the lake that could have affected the trophic status of Lower St. Regis Lake. There was a sudden spike in the relative abundance of F. crotonensis and an increase in organic content at a depth of 20 cm in the core, indicating that conditions became more eutrophic. Based on the lead-210 dates, this spike in F. crotonensis and organic content occurred between 1898 and 1908, when development around the lake was increasing and Paul Smith’s Hotel added indoor plumbing with poor wastewater treatment practices.
Literary Rights: Off
File Attachments: Capstone_0.docx
The Lower St. Regis Lake Shoreline: Understanding the Past, Analyzing the Present, and Recommendations for the Future
Sat, 05/09/2020 - 11:54
Abstract: Continuing shoreline research and restoration planning will help Paul Smith’s College adhere to their own missions and visions including experiential learning, improving students' lives, and maintaining an ecological conscience as a community.
Literary Rights: On
Major: Ecological Restoration, Environmental Sciences
Presence and Abundance of Microplastics within Flowing Waters of Private, Wilderness, and Other Forest Preserve Lands of the Northern Adirondack Park
Mon, 04/28/2014 - 16:26
Abstract: Microplastic sampling was conducted at thirteen locations throughout the water bodies of the Northern Adirondack Region. Plastics were found at all thirteen sites, which were categorized by the impact level of human development. Any particle less than 5mm can be defined as a microplastic particle. Microscopic plastics can be found in a variety of chemical cleaners, clothing fabrics, and concrete solutions. Storm water drainage systems and wastewater treatment plants are confirmed sources of microplastic pollution, which carry pollutants into our rivers, lakes, and streams. Ingestion of microplastic particles can lead to many distinctive threats, including biological and physical abnormalities, while possibly leading to bioaccumulation and biomagnification throughout the food web. Future practices for management and prevention of microplastic pollutants in the Adirondacks is critical for environmental protection, while also portraying a worldly view of an overlooked human induced issue.
Literary Rights: Off
Major: Environmental Sciences, Natural Resources Management and Policy
File Attachments: Microplastic particles in the Northern Adirondack Park
Changes in aquatic communities resulting from interactions between climate change and invasive aquatic plants in the Adirondacks.
Thu, 02/09/2012 - 11:26
Abstract: Global climate change can act synergistically with invasive species leading to shifts in ecosystem structure and function. We assessed how a rise in water temperature influenced the potential competitive advantage of an invasive aquatic plant, Eurasian watermilfoil, (Myriophyllum spicatum) over a co-occurring native species northern watermilfoil (M. sibiricum). We also examined the interrelationship between water temperature, watermilfoil, and the aquatic ecosystem including periphyton growth and zooplankton abundance. The study was conducted using replicated mesocosms (3785-liter), with water heaters used to provide a range of temperatures. We found that increasing water temperature promoted the likely competitive advantage of the invasive species, M. spicatum: Survival of M. sibiricum plants was lower than that of M. spicatum across all temperature treatments with a mean survival rate of 24% and 96% respectively. M. sibiricum also showed significantly slower rates of plant growth (mean growth of 3.3 cm compared to 7.6 cm for M. spicatum) and reduced vigor compared to M. spicatum, with an average of less than half the number of growing meristems. Zooplankton densities averaged over 20 times higher in mesocosms with M. sibiricum compared to those with the invasive M. spicatum. Periphyton biomass was best explained by water temperature with an increase in growth in warmer water. Our study confirms that in the face of global climate change, the invasive M. spicatum will continue to exert dominance over its native counterpart. Our results also provide compelling evidence that the combined effects of climate change and invasive aquatic plants can dramatically alter aquatic ecosystems.
Literary Rights: Off
Major: Environmental Sciences, Fisheries and Wildlife Science, Forestry, Natural Resources Management and Policy
File Attachments: Climate change and milfoil draft FINAL.doc