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Recent Submissions

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    Diving Deeper: Leveraging the Chondrichthyan Fossil Record to Investigate Environmental, Ecological, and Biological Change
    (Annual Reviews, 2024-12-23) Kim, Sora L.; Balk, Meghan A.; Sibert, Elizabeth C.; Whitenack, Lisa; Whitenack, Lisa; Biology
    The extensive chondrichthyan fossil record spans 400+ million years and has a global distribution. Paleontological studies provide a foundation of description and taxonomy to support deeper forays into ecology and evolution considering geographic, morphologic, and functional changes through time with nonanalog species and climate states. Although chondrichthyan teeth are most studied, analyses of dermal denticle metrics and soft tissue imprints are increasing. Recent methodological advances in morphology and geochemistry are elucidating fine-scale details, whereas large datasets and ecological modeling are broadening taxonomic, temporal, and geographic perspectives. The combination of ecological metrics and modeling with environmental reconstruction and climate simulations is opening new horizons to explore form and function, demographic dynamics, and food web structure in ancient marine ecosystems. Ultimately, the traits and taxa that endured or perished during the many catastrophic upheaval events in Earth’s history contribute to conservation paleobiology, which is a much-needed perspective for extant chondrichthyans. ■ The longevity and abundance of the chondrichthyan fossil record elucidates facets of ecological, evolutionary, and environmental histories. ■ Though lacking postcranial, mineralized skeletons, dental enameloid and dermal denticles exquisitely preserve morphology and geochemistry. ■ Technical advances in imaging, geochemistry, and modeling clarify the linkages between form and function with respect to physiology, diet, and environment. ■ Conservation efforts can benefit from the temporal and spatial perspective of chondrichthyan persistence through past global change events.
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    The impact of anti-bullying laws on children's social-behavioral skills
    (Frontiers Media SA, 2025-04-27) Sun, Xiaohan; Zhao, Hang; Sun, Xiaohan; Zhao, Hang; Business and Economics; Computer and Information Science
    Bullying and violence, both on and off campuses, significantly impact children’s well-being. To address school bullying, every U.S. state gradually developed and implemented school anti-bullying laws (ABLs) and regulations between 2000 and 2015. This paper evaluates the effectiveness of ABLs using a difference-in-differences model and nationally representative samples of U.S. elementary school children. While state ABLs show limited overall effects on children’s social-behavioral skills, significant improvements are observed in self-control and interpersonal skills among low-income children, along with reduced externalizing behaviors among Hispanic children. States with strong or moderate ABLs show greater improvements in children’s interpersonal skills compared to states with weaker policies. These findings indicate social disparities in school bullying outcomes and highlight the importance of stronger policy enforcement.
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    Lawns Be Gone: Feasibility Study at Allegheny College Meadville, Pennsylvania
    (2025-04-21) Scott , Ethan; Environmental Science and Sustainability
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    Biogeochemical characteristics and hydroperiod affect carbon dioxide flux rates from exposed high-elevation pond sediments
    (Wiley, 2021-04-16) DelVecchia, Amanda Gay; Gougherty, Steven; Taylor, Brad W.; Wissinger, Scott A.; Wissinger, Scott A.; Biology; Environmental Science and Sustainability
    While inundated, small ponds (< 1000 m2 area) account for disproportionately large contributions of CO2 efflux to the global carbon budget and also store carbon in anoxic sediments. However, pond hydrology is shifting toward increasingly dry conditions in alpine and temperate zones, which might lead to increased exposure of shallow pond sediments. We analyzed sediment CO2 efflux rates in dried sediments of multiple ponds of varying hydrology and sediment characteristics at montane and subalpine elevations near the Rocky Mountain Biological Laboratory in Colorado. Average CO2 efflux rates from exposed sediments, 331.5 ± 11.5 mmol m−2 d−1 at the montane sites and 142.8 ± 45.1 mmol m−2 d−1 at the subalpine sites, were 10 times higher than average CO2 efflux rates from pond water. Principal components analysis to reduce dimensionality of sediment characteristics revealed that random inter-pond differences rather than exposure timing or hydroperiod drove variation among sediments. In linear mixed effects models of CO2 flux rates, significant predictors included sediment moisture and temperature, pH, total organic carbon, and organic matter content at all pond hydroperiod classifications and sites. However, the sediment characteristics explaining the most variance differed among sites and hydroperiods and included nitrate concentrations, pH, bulk density, and temperature. We conclude that pond sediments are heterogeneous both within and among ponds in close proximity, and drivers of relatively high CO2 efflux rates differ among pond hydroperiods and elevations. This work emphasizes that local differences can impact predictions of CO2 flux from lentic sediments which are becoming increasingly exposed.
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    2025-04-25: The Campus
    (Allegheny College, 2025-04-25)

Communities in DSpace

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Now showing 1 - 5 of 7
  • College Committees / Shared Governance
    College Meeting minutes and supporting documents including student government minutes
  • Institutional Effectiveness
    Documents associated with assessment and institutional research.
  • Merrick Archives
    Digital collections from archives holdings including: Allegheny’s First One Hundred Years; Borges at Allegheny College 1985; Reflections on the COVID-19 Pandemic; Reflections on Social (In) Justice
  • Special Collections
    The Documents of Ida M. Tarbell and Civil War Letters of Stephen R. Clark, Ohio Calvary and Willard Cutter, 150th Pennsylvania Regiment, Company K.
  • Student Publications
    Allegheny’s student newspaper The Campus and Kaldron (yearbook)