Browsing by Subject "Aquatic macrophytes"

Now showing 1 - 3 of 3
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    Data and R-code for "Aquatic Macrophyte and Water Quality Response to Aluminum Sulfate Treatments"
    (2025-03-05) Hembre, Kaitlyn; Newman, Raymond M; Bajcz, Alex W; Berg, Matt; James, William; newma004@umn.edu; Newman, Raymond; Minnesota Aquatic Invasive Species Research Center (MAISRC); water
    This study examines data from 6 lakes in Minnesota and 2 in Wisconsin to assess the response of aquatic plants and water quality to aluminum sulfate (alum) treatments. The dataset spans from 2011 to 2023 and includes measurements of total epilimnetic phosphorus, Secchi depths, and the frequency of native and invasive macrophyte species. Data were collected directly by project personnel but we also include data provided by project collaborators that were used in the formal analysis. Additional data collected by project personnel, including all point intercept aquatic plant data, temperature, light and dissolved oxygen profiles, and additional water chemistry data are included to facilitate further analysis in the future. Results indicate a marked reduction in total epilimnetic phosphorus levels and improved water clarity (Secchi) after alum treatment, with notable increases in native macrophyte occurrence. Invasive species such as curly-leaf pondweed decreased after alum treat, while Eurasian watermilfoil exhibited variable responses. This comprehensive dataset highlights the effectiveness of alum treatments in enhancing water quality and supporting macrophyte health, with considerations for ongoing invasive species management.
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    Data for: "Effect of light on macrophyte sprouting and assessment of viable seedbank to predict community composition"
    (2022-02-22) Dunne, Melaney A; Newman, Raymond M; Newma004@umn.edu; Newman, Raymond M.; Minnesota Aquatic Invasive Species Research Center (MAISRC)
    These are data from the paper: “Effect of light on macrophyte sprouting and assessment of viable seedbank to predict community composition” Sediments cores from each lake were pooled and homogenized and placed in trays with controlled lighting and temperature. Germination was determined for low light conditions (low water clarity), higher light conditions (high water clarity) and a treatment with gibberellic acid to induce germination and sprouting (maximum emergence – called maximum germination in the JAPM publication). Trays were examined weekly for newly sprouted plants that were identified to species and enumerated.
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    Local and cumulative influences of docks on littoral habitat structure
    (2013-05) Lepore, Jessie
    The expansion of residential development along Minnesota lakeshores has dramatically altered littoral habitat and the fish communities it supports. Previous studies have linked lakeshore development to reductions in abundance of aquatic vegetation and coarse woody structure; however, few studies have quantified the specific influence of docks on aquatic habitat structure. We assessed coarse woody structure and three measures of macrophyte abundance across three scales of development in 11 Minnesota lakes, using docks as an index of development. All four habitat components were influenced by distance to the nearest dock structure. Site-level abundance of coarse woody structure and presence of emergent species were significantly and negatively related to lake-wide dock density, indicating that these habitat components are particularly vulnerable to development. These findings suggest that management of lake fish habitat should address both local and lake-wide scales of development. In addition, dock size restrictions could minimize impacts to critical habitat structure.