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Biological Control: Effects Of Tyria Jacobaeae On The Population Dynamics Of Senecio Jacobaea In Northwest Montana, Kimberly Kay Crider
Biological Control: Effects Of Tyria Jacobaeae On The Population Dynamics Of Senecio Jacobaea In Northwest Montana, Kimberly Kay Crider
Graduate Student Theses, Dissertations, & Professional Papers
Biological control, using introduced, specialist insects is a common strategy for controlling plant invasions. However, the efficacy of biological control agents in controlling their host plants is rarely quantified population level. I quantified the impact of a specialist biological control agent, the cinnabar moth (Tyria jacobaeae) on its host plant, tansy ragwort (Senecio jacobaea) in northwest Montana. Cinnabar moth damage and its effects on important plant vital rates were tested with and without specialist herbivores. The presence of moth larvae corresponded to a reduction in population growth rates to less than one, compared to herbivore-free controls, indicating the potential for …
The Biogeography Of Ageratina Adenophora: A Mexican Trans-Global Invader, Heather Marie Evans
The Biogeography Of Ageratina Adenophora: A Mexican Trans-Global Invader, Heather Marie Evans
Graduate Student Theses, Dissertations, & Professional Papers
Evans, Heather, Master of Science, May 2010 The Biogeography of Ageratina adenophora: A Mexican Trans-Global Invader Co-Chairman: Dr. Jeffrey Gritzner Co-Chairman: Dr. Ragan Callaway Invasive plants are a global problem often resulting in negative impacts upon populations of native plants and the environments in which they grow. Invasive plants inhibit native species and take over areas where they have been introduced. These invasive species create ecological problems for wildlife foraging, as they often transform the vegetation of native habitats resulting in conditions unsuitable for grazing. In addition, invasive plant species pose problems for humans in the areas of health, economics, …