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1. INCREASING STUDENT RECRUITMENT AND RETENTION USING PLACE-BASED RESEARCH PROGRAMS FOR INCOMING AND FIRST-YEAR EARTH AND ENVIRONMENTAL SCIENCE STUDENTS IN OGDEN, UT

   https://doi.org/10.1130/abs/2021AM-370254  

   Balgord, Elizabeth; Frantz, Carie M.; Matyjasik, Marek (January 2021, Geological Society of America Abstracts with Programs)

   The Geoscience Education Targeting Underrepresented Populations program is a National Science Foundation funded project designed to assess the effectiveness of a multifaceted approach to increase recruitment and retention in Earth & Environmental Science (EES) majors at Weber State University (WSU) in Ogden, Utah. This program integrates a combination of early outreach to high schools, concurrent-enrollment courses, a summer bridge program, structured early undergraduate research experiences, community engaged learning, and multiple pedagogies to support a diverse student population. The focus of this presentation will be on the place-based educational approach to teaching an Earth science summer bridge program and a first-year summer research experience. These programs overlap in both time and location allowing incoming students to have peer-to-peer interactions with current EES majors. The summer bridge program runs for two weeks and provides students with an introduction to the WSU campus, available student services, initial advising, and an early collaborative research experience focused on local natural hazards and the Great Salt Lake basin water resources. Students collect water samples from Great Salt Lake, local streams, and a groundwater well field on WSU’s campus. Students then analyze major element chemistry of those samples with the help of faculty and students in the EES department using lab facilities at WSU. The summer research program is a four-week summer program for freshmen and sophomores who have declared an EES major. Students conduct in-depth field and lab research project on the Great Salt Lake ecosystem, using real-time geochemical data collected from field observatories on Antelope Island State Park. Students work as a team with a faculty lead and senior peer teaching assistants to address a research question by analyzing field station data as well as collecting and analyzing environmental chemistry and microbiology samples from the lake, including alkalinity, inorganic and organic carbon, major ions, cell counts, and photosynthetic efficiency. The summer research students also act as peer mentors for students in the Summer Bridge. All students present their research finding to friends and family at a celebratory event on the last day of both programs. We will present on the successes and challenges of the program to date and our plans to assess various components and their overall impact on student recruitment and retention in our department. 

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2. Use of remote imagery to map microbialite distribution at Great Salt Lake, Utah: Implications for microbialite exposure

   https://doi.org/10.31711/ugap.v51i.136  

   Wilcock, Laura; Frantz, Carie; Vanden_Berg, Michael (February 2024, Geosites)

   The elevation of Great Salt Lake has fallen to historic lows in recent years, exposing once submerged microbialites along the lake’s shores. Although prior studies have attempted to map microbialite locations, this has proved challenging, with mapped microbialite areas limited to accessible shoreline locations or via indirect sonographic evidence. Meanwhile, the importance of Great Salt Lake’s microbialites to the lake’s food chain has made quantifying the extent of microbialites exposed versus submerged at different lake elevations critical to lake management decisions. Low lake levels combined with seasonal high-water clarity have enabled microbialite reefs to be spotted in aerial and satellite imagery, even in deeper areas of the lake. In this study, satellite images were used to identify and map microbialite reef areas in Great Salt Lake and along its dry shores. In the south arm, submerged microbialites were easily recognized as dark green reefs against a light-colored benthic background (primarily ooid sand). Stationary microbialite mounds were distinguished from rip-up clasts or other dark-colored mobile material by comparing potential microbialite regions across several high-visibility timepoints. In this way, we identified 649 km2 (251 mi2) of putative microbialite reef area: 288 km2 (111 mi2) in the north arm, 360 km2 (139 mi2) in the south arm, of which 375 km2 (145 mi2) was mapped at a high degree of confidence. We also produced geospatial shapefiles of these areas. This map, combined with currently available lake bathymetric data, permits the estimation of the extent of microbialite reef exposed vs. submerged in various parts of the lake at different lake elevations. At the end of fall 2022, when lake level dipped to 1276.7 masl (4188.5 ft-asl) in elevation, we estimate that ~40% of the south arm microbialite reef area was exposed. 

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3. First data on water mite (Acari, Hydrachnidia) assemblages of Point Rosa Marsh, Harrison Township, Michigan, USA,and their use as environmental bioindicators of aquatic health

   https://doi.org/10.24349/2m5p-c5ku  

   Vasquez, Adrian A.; Kabalan, Bana A.; Miller, Carol J. (September 2022, Acarologia)

   Water mites are aquatic arachnids that have been used in Europe and Central America as bioindicators of ecological health in various freshwater ecosystems (including bogs). Water mites can be found in high densities in the Laurentian Great Lakes and adjacent habitats. Although they are abundant, water mites are generally not used in the assessment of aquatic habitats in the Great Lakes and are usually assigned to the “other” category in macroinvertebrate assessments. This is despite evidence of their utility as aquatic bioindicators. In the present study we consider water mites as bioindicators of the environmental health of Point Rosa marsh, a threatened marsh found on the US side of transboundary Lake St. Clair. The abundance of water mites in Point Rosa Marsh increased from 2017 to 2019 as lake water levels increased. Although increasing water levels in Lake St. Clair can be considered a negative event due to loss of irreplaceable coastal habitat by erosion with potential economic impacts, this present study indicates that water mite populations in Point Rosa Marsh increased during the same period (2017 to 2019). As a result of our study we: update the biodiversity of water mites from Lake St. Clair with new records compared to the last report from the lake over 45 years ago, first report on water mite assemblages at Point Rosa marsh at the Lake St. Clair Metropark on Lake St. Clair and the first demonstration of water mites used as bioindicators in the habitats of the Laurentian Great Lakes. 

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4. Desiccation of ecosystem-critical microbialites in the shrinking Great Salt Lake, Utah (USA)

   https://doi.org/10.1371/journal.pwat.0000100  

   Frantz, Carie; Gibby, Cecilia; Nilson, Rebekah; Stern, Cole J.; Nguyen, Maggie; Ellsworth, Cody; Dolan, Hank; Sihapanya, Alvin; Aeschlimann, Jake; Baxter, Bonnie K. (September 2023, PLOS Water)

   Gottstein, Sanja (Ed.)

   Great Salt Lake hosts an ecosystem that is critical to migratory birds and international aquaculture, yet it is currently threatened by falling lake elevation and high lakewater salinity resulting from water diversions in the upstream watershed and the enduring megadrought in the western United States. Microbialite reefs underpin the ecosystem, hosting a surface microbial community that is estimated to contribute 30% of the lake’s primary productivity. We monitored exposure, desiccation, and bleaching over time in an area of microbialite reef. During this period, lake elevation fell by 1.8 m, and salinity increased from 11.0% to 19.5% in open-water portions of the outer reef, reaching halite saturation in hydrologically closed regions. When exposed, microbialite bleaching was rapid. Bleached microbialites are not necessarily dead, however, with communities and chlorophyll persisting beneath microbialite surfaces for several months of exposure and desiccation. However, superficial losses in the mat community resulted in enhanced microbialite weathering. In microbialite recovery experiments with bleached microbialite pieces, partial community recovery was rapid at salinities ≤ 17%. 16S and 18S rRNA gene sequencing indicated that recovery was driven by initial seeding from lakewater. At higher salinity levels, eventual accumulation of chlorophyll may reflect accumulation and preservation of lake material in halite crusts vs. true recovery. Our results indicate that increased water input should be prioritized in order to return the lake to an elevation that submerges microbialite reefs and lowers salinity levels. Without quick action to reverse diversions in the watershed, loss of pelagic microbial community members due to sustained high salinity could prevent the recovery of the ecosystem-critical microbialite surface communities in Great Salt Lake. 

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5. Explaining the 2022 Record Low Great Salt Lake Volume

   https://doi.org/10.1029/2024GL112154  

   Bigalke, Siiri; Loikith, Paul; Siler, Nicholas (January 2025, Geophysical Research Letters)

   Abstract The Great Salt Lake reached the lowest water volume in its entire 170+ year record in 2022. To explain this record low we develop and apply a lake mass‐balance model and perform four simulations: one where all input and output variables are fixed to their mid‐20th century average resulting in an equilibrium lake volume, and three others where one of the input variables (precipitation or streamflow) or the output variable (evaporation) follows observations while the other two are fixed to their mid‐20th century average. Results show anomalously low streamflow accounting for the largest proportion of the lake volume departure from the equilibrium state by 2022, resulting in about three times the additional water loss over 1950–2022 as increasing evaporation, which played the second largest role. Precipitation changes played a minimal role. Though streamflow had a greater effect, the lake would not have reached the record low volume without increasing evaporation. 

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