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Filtering by: Creator Weinrich, Mason T. Remove constraint Creator: Weinrich, Mason T. Advisor Mason, Robert T. Remove constraint Advisor: Mason, Robert T.

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  • Stress and reproduction in male garter snakes

    Creator:
    Moore, Ignacio T.
    Abstract:
    Animals respond to stressful situations with increases in plasma levels of glucocorticoid stress hormones. These hormones originate from the adrenal cortex in response to stimulation of the hypothalamic-pituitary-adrenal axis. Glucocorticoids (corticosterone in reptiles) function to mobilize energy and suppress unnecessary functions until the stress passes. Among these immediately unnecessary functions...
    Resource Type:
    Dissertation
    Full Text:
    Garter Snake, Thamnophis sirtalis parietalls Ignacio T. Moore, Michael P. LeMaster and Robert T. Mason

  • The ontogeny and mediation of sexual size dimorphism in the red-spotted garter snake, Thamnophis sirtalis concinnus

    Creator:
    Lerner, Darren T.
    Abstract:
    A wide range of environmental and physiological factors influence the type and extent of sexual dimorphism found in animals. Influential factors include variable climate, competition for resources and mates, mate choice, and parental investment. In addition, some investigators attribute differences in body size to physiological factors influenced by genetic and...
    Resource Type:
    Masters Thesis
    Full Text:
    concinnus. Abstract approved: Robert T. Mason A wide range of environmental and physiological factors

  • Life in a Rapidly Changing Environment: The Thermal Biology of the Red-sided Garter Snake (Thamnophis sirtalis parietalis)

    Creator:
    Hubert, David L.
    Abstract:
    At a time when environmental conditions are rapidly changing, understanding how thermal extremes impact wildlife is imperative to fully understanding the consequences of climate change in natural ecosystems. While many organisms are currently impacted by rapidly warming and more erratic environmental conditions, identifying and investigating model species whose life histories...
    Resource Type:
    Dissertation
    Full Text:
    T. Mason At a time when environmental conditions are rapidly changing, understanding how

  • Sources of variability in duration of anesthesia with brevital sodium in snakes

    Creator:
    Preston, Daniel L.
    Abstract:
    Variability in the depth and duration of anesthesia in individuals within a species is frequently observed, yet few studies have investigated its causes in reptiles. To evaluate the potential causes of variability in reptile anesthesia, I conducted experiments to test for effects of body temperature, body composition and time post-feeding...
    Resource Type:
    Honors College Thesis
    Full Text:
    : __________________________________ Robert T. Mason Variability in the depth and duration of anesthesia in individuals within

  • Reproductive implications of parasitic infections and immune challenges in garter snakes

    Creator:
    Uhrig, Emily J.
    Abstract:
    Parasitic infections and immune challenges can affect host reproductive fitness and, ultimately, the evolution of host populations in a myriad of ways. The fitness implications of parasitic infections range from increased host mortality to subtle changes in reproductive investment. From alterations of behaviors, sexual signaling, and competitive ability to changes...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ Robert T. Mason Parasitic infections and immune challenges can affect host reproductive

  • Effect of Captivity on Chemical Profiles of the Sexual Attractiveness Pheromone of the Red-Sided Garter Snake, Thamnophis sirtalis parietalis

    Creator:
    Rudie, Katherine A.
    Abstract:
    This study investigated the effect of captivity on the chemical profiles of the female sexual attractiveness pheromone of the red-sided garter snake (Thamnophis sirtalis parietalis). Dorsal skin lipids were extracted from female garter snakes collected from the Interlake region of Manitoba, Canada. A comparison of captive and wild snakes was...
    Resource Type:
    Honors College Thesis
    Full Text:
    approved: ______________________________________________________ Robert T. Mason This study

  • Activation, modification and suppression of sex pheromone production in garter snakes

    Creator:
    Parker, M. Rockwell
    Abstract:
    Vertebrates communicate with one another and coordinate intraspecific reproduction by using a variety of sexually dimorphic signals, such as plumage, ornaments, sounds, and/or scents. These sexual dimorphisms are maintained by physiological factors, typically sex-specific hormones (though see Chapter 3 for an exception). The purpose of the research in this dissertation...
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________________________________________ Robert T. Mason Vertebrates communicate with one another and coordinate intraspecific

  • Behavioral adaptations and the minimization of reproductive costs in the male red-sided garter snake, Thamnophis sirtalis parietalis.

    Creator:
    O'Donnell, Ryan P.
    Abstract:
    The benefits of reproduction are clear, but there are also costs. Much is known about the costs of reproduction in females, but only recently have male costs been investigated in any depth. These costs of reproduction may be minimized by appropriately modifying behavior, but there has been little research on...
    Resource Type:
    Masters Thesis
    Full Text:
    : ___________________________________________________ Robert T. Mason The benefits of reproduction are clear, but there are also

  • Phenotypic variation in the sexual attractiveness pheromone of the red-sided garter snake, Thamnophis sirtalis parietalis

    Creator:
    LeMaster, Michael P.
    Abstract:
    Pheromones are chemical cues produced by organisms that affect the behavior and/or physiology of conspecifics. The orchestration of reproductive behaviors in many animals depends on the expression of sex pheromones. In insects, intraspecific variation in sex pheromone expression is commonly observed and often influences social interactions between individuals. To what...
    Resource Type:
    Dissertation
    Full Text:
    sirtalis parietalis. Abstract approved: Robert T. Mason Pheromones are chemical cues produced by

  • Pheromonal mediation of reproductive behavior in the brown tree snake

    Creator:
    Greene, Michael John
    Abstract:
    In animals, reproductive behaviors serve to attract individuals together during the breeding season and to coordinate the behavioral and physiological states of individuals so that mating can successfully occur. In snakes, the various reproductive behaviors including courtship, mating, courtship inhibition, male combat and trailing are mediated primarily by pheromones. Pheromones...
    Resource Type:
    Dissertation
    Full Text:
    Reproductive Behavior in the Brown Tree Snake. Abstract approved: Robert T. Mason In animals, reproductive