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  • Biogeography of nonindigenous species: from description to prediction

    Creator:
    Reusser, Deborah A.
    Abstract:
    Nonindigenous species are a major threat to the ecological integrity and biodiversity of marine and estuarine ecosystems. To become a successful invader, species must pass through four phases: (1) survive transport, (2) survive release, (3) establish a population, and (4) expand their range. To better understand these processes, an integrated...
    Resource Type:
    Dissertation
    Full Text:
    , organism concentrations in the ballast, and invasibility of individual ports, the PCIP provides a

  • Simulator-Defined MDP Planning with Applications in Natural Resource Management

    Creator:
    Alkaee Taleghan, Majid
    Abstract:
    This work is inspired by problems in natural resource management centered on the challenge of invasive species. Computing optimal management policies for maintaining ecosystem sustainable is challenging. Many ecosystem management problems can be formulated as MDP (Markov Decision Process) planning problems. In a simulator-defined MDP, the Markovian dynamics and rewards...
    Resource Type:
    Dissertation
    Full Text:
    measure in our exploration heuristics. 3. We adopt an extension to the termination condition introduced

  • Optimal spatial-dynamic resource allocation facing uncertainty : integrating economics and ecology for invasive species policy

    Creator:
    Hall, Kim M.
    Abstract:
    The spatial and temporal behavior of invasive species spread implies that optimal management strategies involve decisions over space and time. Dispersal and propagule pressure are two primary drivers of the spatial-temporal ecological process of species invasion. In the case of riparian communities, stream flow drives the dispersal of vegetation propagules....
    Resource Type:
    Dissertation
    Full Text:
    through a process driven by propagule pressure --the number of introduced individuals and the number of

  • Ultraviolet radiation as an environmental stressor of amphibians

    Creator:
    Bancroft, Betsy A.
    Abstract:
    My thesis explored the effects of and potential mediating mechanisms for an important environmental stressor, ultraviolet-B (UVB) radiation. UVB radiation has negative effects on organisms in both terrestrial and aquatic systems. I used meta-analysis to quantify the effects of UVB radiation on a diversity of aquatic organisms (Chapter 2). UVB...
    Resource Type:
    Dissertation
    Full Text:
    negative effects on organisms in both terrestrial and aquatic systems. I used meta-analysis to