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Recent Submissions

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    Contrasting short- and long-term outcomes of pairwise interactions between caddisflies at a hydrologically heterogeneous range margin
    (Wiley, 2023-02-01) Shepard, Isaac D.; Wissinger, Scott A.; Greig, Hamish S.; Wissinger, Scott A.; Environmental Science and Sustainability
    1. Climate change is leading many species to shift their geographical ranges. Species undergoing these range shifts often are moving into areas with heterogeneous abiotic conditions. Additionally, these range-shifting species will encounter resident species with whom they will compete for space and/or resources. However, the ways that these abiotic and biotic factors interact to influence the establishment and persistence of range-shifting species has received little attention. 2. Here, we conduct an in situ cage experiment examining how a local wetland hydroperiod gradient (i.e., temporary and semi-permanent ponds) and competition with a resident caddisfly species, Asynarchus nigriculus, influences the survival of the range-shifting species Limnephilus picturatus. We then use long-term survey data of population densities of these two species to determine whether pairwise interactions observed in the cage experiment translated into long-term dynamics. 3. The cage experiment revealed that A. nigriculus had a strong, negative effect on the survival of the range-shifting species L. picturatus, regardless of hydroperiod. However, we observed no relationship between the densities or occurrence of L. picturatus and A. nigriculus in long-term data for either temporary or semi-permanent ponds. 4. Our results suggest that landscape-level abiotic heterogeneity at range margins may not always be important for mediating antagonistic interactions between resident and range-shifting species. However, although an interaction appears ecologically significant in short-term field studies, broader context is needed to understand whether those types of interactions mediate species' distributions and abundance through time. 5. At face-value, our results from the field experiment and long-term data analysis did not align. This suggests that other factors such as additional competitive or trophic interactions may be more important drivers behind the population dynamics of this range-shifting species at its new upper-elevational limit.
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    2024-04-26: The Campus
    (Allegheny College, 2024-04-26)
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    2024-03-22: The Campus
    (Allegheny College, 2024-03-22)
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    2024-04-19: The Campus
    (Allegheny College, 2024-04-19)

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)