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Articles 1 - 5 of 5
Full-Text Articles in Life Sciences
Trophic Dynamics Of The Lake Superior Fish Community, Ariel Edwards
Trophic Dynamics Of The Lake Superior Fish Community, Ariel Edwards
All NMU Master's Theses
The Lake Superior food web has undergone many changes in recent decades, including the rehabilitation of the native apex predator lake charr (Salvelinus namaycush) and the introduction of several nonnative species. The trophic linkages and ecological requirements of the entire fish community, including predators and prey fishes, has not been assessed on a whole-lake scale in over a decade. Here, I investigated the trophic dynamics across multiple regions of the lake, and estimated the consumptive effect of lean lake charr in one region of Lake Superior. From April to October of 2021, a total of five predator, four …
Using Acoustic Telemetry To Analyze The Impacts Of Common Carp On Wild Rice Restoration, Franklin Zomer
Using Acoustic Telemetry To Analyze The Impacts Of Common Carp On Wild Rice Restoration, Franklin Zomer
All NMU Master's Theses
Wild rice (Zizania palustris) is an important cultural, spiritual, and dietary resource to Lake Superior Ojibwe. Common Carp (Cyprinus carpio) are an introduced species that negatively impact aquatic vegetation through changes in water quality, uprooting of plants, and consumption of seed. Acoustic telemetry was used to document Common Carp movements in Waishkey Bay in the upper St. Marys River, MI where wild rice habitat is present. Exclosures were established to measure the influence of carp presence on wild rice seeding success. Common Carp were observed to spend much of their time in Waishkey Bay but also …
Reassessment Of The Extinction Risk Of The Neotropical Freshwater Crabs Of The Family Pseudothelphusidae, Ada Acevedo Alonso
Reassessment Of The Extinction Risk Of The Neotropical Freshwater Crabs Of The Family Pseudothelphusidae, Ada Acevedo Alonso
All NMU Master's Theses
The Neotropical region is one of the world’s biodiversity hotspots, and its freshwater crabs are notably diverse, and are represented by two families, Pseudothelphusidae and Trichodactylidae. This study focuses on this region’s highly diverse Pseudothelphusidae which includes 48 genera and 289 species. The 2008 IUCN global conservation assessment found 15.5% of the Pseudothelphusidae to be threatened with extinction and projected that in the worst-case scenario (if all of the Data Deficient species turned out to be threatened), the number of threatened species would be significantly higher. In the last decade several new species of pseudothelphusids have been described, and more …
Impacts Of River Influence And Wave Exposure On The Epipsammic Diatoms Of The Lake Superior Wave Zone, Leon R. Katona
Impacts Of River Influence And Wave Exposure On The Epipsammic Diatoms Of The Lake Superior Wave Zone, Leon R. Katona
All NMU Master's Theses
Although little is known about primary productivity in wave zone habitats of very large lakes, it is presumably dominated by microalgae that attach to mineral substrates. Watershed energetics are linked with these wave zones through river mouth habitats, which provide nutrient and organismal input to lake systems. In this study, I assessed the abundance, productivity, and community composition of epipsammic diatoms in river mouth and beach habitats along the south-central coast of Lake Superior. Chlorophyll a concentrations were more than three-fold greater in river mouths (mean ± 1SE = 1.17 ± 0.45 mg/m2), than in wave zone (0.36 …
Stomach Content Analysis Of Botulism-Affected Birds In Lake Michigan, David A. Essian
Stomach Content Analysis Of Botulism-Affected Birds In Lake Michigan, David A. Essian
All NMU Master's Theses
Avian botulism type E has caused large-scale bird and fish die-offs on the Great Lakes annually since 1998, and continues to threaten breeding and migratory waterbirds in the region. From 2010 to 2012, several northern Lake Michigan beaches were monitored for avian mortalities by National Park Service, Common Coast Research and Conservation, and U.S. Geological Survey personnel, partners, and volunteers. Bird carcasses were collected and tested for the presence of botulinum toxin type E (BoNT/E) at the USGS National Wildlife Health Center. I compare the prey composition and prey sizes consumed by the birds that were collected. Additionally, I examine …