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You searched for +publisher:"University of North Carolina" +contributor:("Heckman, Robert"). One record found.

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University of North Carolina

1. Heckman, Robert. Influences of Natural Enemies and Resource Availability in Biological Invasions by Plants.

Degree: Biology, 2017, University of North Carolina

Biological invasions—the establishment and spread of species outside their historical native ranges—has implications for basic ecology as well as conservation and human well-being. As such, identifying the mechanisms that promote invasions is crucial for both applied and basic ecology. While most major invasion hypotheses focus on a single causal mechanism (e.g., nutrient availability, traits of the invasive species), my research examines whether trade-offs between resource allocation to growth of new tissue and defense of tissue against disease and herbivory can explain why some non-native species become invasive in their new range and others do not. Specifically, I tested whether exotic species benefit more from enemy release relative to native competitors in high resource environments. To that end, I conducted a series of field experiments at the level of individual plants and plant communities. This research represents the first thorough test of the assumptions and key predictions of a hypothesis which integrates information about invasive species, invaded communities, and the environment in which invasion occurs to explain invasion success more broadly than previously possible (the Resource-Enemy Release Hypothesis, R-ERH). I tested this hypothesis in grassland communities and with individuals of several grass species. At the community level, exotics were less damaged than natives, especially in fertilized communities. Moreover, fertilization increased foliar damage on native species. Finally, fertilization increased exotic dominance only in communities exposed to vertebrate herbivores, and excluding insect herbivores and fungal pathogens reduced exotic dominance regardless of fertilization. At the individual level, species benefitting most from fertilization also benefitted most from exclusion of fungal pathogens and insect herbivores; this relationship was similar for natives and exotics. Within assembled native communities, fertilization increased, and enemy exclusion reduced, exotic dominance. Furthermore, fertilization and enemy exclusion each reduced native colonization of exotic-dominated communities. Together, these results provided partial support for R-ERH. Importantly, they also show that invasions can be driven by multiple independent, not interacting, factors. Advisors/Committee Members: Heckman, Robert, Mitchell, Charles, Bruno, John, Peet, Robert K., Umbanhowar, James, Wright, Justin.

Subjects/Keywords: College of Arts and Sciences; Department of Biology

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APA (6th Edition):

Heckman, R. (2017). Influences of Natural Enemies and Resource Availability in Biological Invasions by Plants. (Thesis). University of North Carolina. Retrieved from https://cdr.lib.unc.edu/record/uuid:cd5431da-863d-48fa-bb57-d4aaeac2b81d

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Heckman, Robert. “Influences of Natural Enemies and Resource Availability in Biological Invasions by Plants.” 2017. Thesis, University of North Carolina. Accessed January 26, 2021. https://cdr.lib.unc.edu/record/uuid:cd5431da-863d-48fa-bb57-d4aaeac2b81d.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Heckman, Robert. “Influences of Natural Enemies and Resource Availability in Biological Invasions by Plants.” 2017. Web. 26 Jan 2021.

Vancouver:

Heckman R. Influences of Natural Enemies and Resource Availability in Biological Invasions by Plants. [Internet] [Thesis]. University of North Carolina; 2017. [cited 2021 Jan 26]. Available from: https://cdr.lib.unc.edu/record/uuid:cd5431da-863d-48fa-bb57-d4aaeac2b81d.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Heckman R. Influences of Natural Enemies and Resource Availability in Biological Invasions by Plants. [Thesis]. University of North Carolina; 2017. Available from: https://cdr.lib.unc.edu/record/uuid:cd5431da-863d-48fa-bb57-d4aaeac2b81d

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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