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Environmental (natural and anthropogenic) effects on host-parasite (snail-trematode) interactions
(2016-05)
This dissertation explored environmental effects on host-parasite interactions. Chapter 2 was published in Ecotoxicology and assessed the effects of the herbicide atrazine on freshwater snails. The results indicated that ...
Influences on plant species distributions and soil organic carbon in playa catchments of the High Plains
(2012-05)
Scope and Method of Study: Depressional wetlands are threatened globally by conversion to agriculture, altering wetland processes and degrading societal services. We elucidated effects of land management and conservation ...
Population genetic analysis of invasive Rattus: Implications for evolutionary biology, disease ecology and invasion biology
(2012-05)
Scope and Method of Study: I utilized population genetic analyses to examine the colonization history and contemporary dispersal patterns of invasive Rattus in the U.S., as well as identifying any evolutionary impacts of ...
Studies on the stoichiometry of sexual dimorphism in Hyalella amphipods
(2016-07)
Understanding the causes and consequences of variation in across multiple levels of biological organization is a central goal in modern biology. Research integrating key ecological and evolutionary processes necessitates ...
Species distributions and trait-environment correlations: Implications for the evolutionary ecology of crayfish (Decapoda: Cambaridae)
(2014-07)
Crayfish occur on every continent, except for Antarctica and Africa excluding Madagascar, and are a very diverse group of freshwater crustaceans with over 600 species. Crayfish are keystone species, ecosystems engineers, ...
Species history, population genetics, and behavioral reproductive isolating mechanisms of two Chihuahuan desert katydids (Orthoptera: Tettigoniidae)
(2015-05)
Understanding the mechanisms and evolutionary processes that lead to reproductive isolation between populations is the major goal of speciation research. Here, I integrated approaches from phylogenetics, population genetics, ...
Effects of tail loss on sprint speed, mating strategies, and territory size and quality in the lizard Uta Stansburiana
(2013-05)
Scope and Method of Study: The study was primarily a field based effort to monitor and document changes in the behavior, mating strategies, and territory size and quality of a population of the lizard Uta stansburiana ...
Individual variation in testosterone levels and parental care in eastern bluebirds (Sialia sialis): Interactions with reproductive success and offspring traits
(2016-07)
Hormones are important regulators of behavior and fitness. We have learned much about the direct effects of hormones on behavior and reproductive success from studies that experimentally manipulate hormone levels. To ...
Methods for predicting environmentally-relevant concentrations of pulsed aquatic exposures
(2016-05)
Most current-use pesticides have short half-lives in the water column and thus the most relevant exposure scenarios for many aquatic organisms are pulsed exposures. However, it is frequently challenging to measure exposure ...