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  • Chemical signaling and pheromone evolution in plethodontid salamanders

    Creator:
    Palmer, Catherine Anne
    Abstract:
    My dissertation focuses on the evolutionary forces that have shaped the chemical signaling system of plethodontid salamanders. Pheromones mediate two phases of plethodontid reproduction: mate attraction prior to courtship and female persuasion during courtship. Substrate-borne chemical signals are believed to play an important role in mate attraction for these animals....
    Resource Type:
    Dissertation
    Full Text:
    also goes out to my committee members, Dede Olson, Andy Blaustein and Fred Obermiller, for tolerating

  • Coexistence of top predators in headwater streams : pathways of intraguild predation between Pacific Giant salamander larvae and cutthroat trout

    Creator:
    Rundio, David E.
    Abstract:
    The coexistence of multiple predators may have important consequences for the structure and function of communities. Interactions between predators may strongly affect their combined direct and indirect effects on prey populations and lower trophic levels. Predators often have size-structured populations, which may result in intraguild predation characterized by complex trophic...
    Resource Type:
    Masters Thesis
    Full Text:
    his advice and encouragement throughout this project, and I am grateful to Andy Blaustein, Lynne

  • Behavioral and demographic characteristics of northern sea lion rookeries

    Creator:
    Merrick, Richard L.
    Abstract:
    Northern sea lions (Eumetopias lubatus) were studied at three sites (Rogue Reef, Oregon, Marmot Island, Alaska, and T.Ugamak Island, Alaska) during the 1982, 1983, 1985, and 1986 breeding seasons. Data were collected on female activity budgets, attendance patterns, births, copulations, population structure, and patterns of seasonal and daily abundance. Females...
    Resource Type:
    Masters Thesis

  • Ecological subsidies to rocky shore communities : setting the stage for community dynamics in the Northeast Pacific

    Creator:
    Krenz, Christopher
    Abstract:
    This dissertation focuses on the importance of pelagic subsidies in the Northeast Pacific to rocky shore community regulation. My results document the patterns of pelagic subsidy supply, determine if those subsidies are correlated with community structure, and examine if community regulation differs between areas of high- and low-subsidies. Understanding how...
    Resource Type:
    Dissertation
    Full Text:
    grateful to the other members of my committee – Steve Gaines, Andy Blaustein and Pat Wheeler. Their

  • Succession and stability in two rocky intertidal communities on the central Oregon coast

    Creator:
    Farrell, Terence M.
    Abstract:
    The stability of a limpet-dominated community was assessed in a experiment in which an consumer was temporarily removed. Compared to unmanipulated plots, the limpet-exclusion plots developed greater algal abundance and altered species composition of both algae and barnacles. The community was not perturbed beyond its capacity to recover, since the...
    Resource Type:
    Dissertation
    Full Text:
    . I thank my committee--Fred Ramsey, Dan Schafer, Jim Hall, Andy Blaustein, Bruce Menge and Jane

  • 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:
    my thesis project. I thank Frank Moore, Andy Blaustein, Larry Ryan and Joe Beatty, the members of

  • 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:
    throughout graduate school. I would also like to thank my committee members, Andy Blaustein, Frank Moore

  • Ecological responses to riverine floods and flow alteration

    Creator:
    McMullen, Laura E.
    Abstract:
    Floods are major disturbance events for riverine ecosystems, directly and indirectly impacting organisms and their habitat. In this study I investigated the role of riverine floods and flow alteration in regulating aquatic macroinvertebrate population and community structure. I examined this problem using a variety of methods: a meta-analytic review of...
    Resource Type:
    Dissertation
    Full Text:
    and welcoming friends. I also thank the rest of my dissertation committee: Andy Blaustein

  • Phylogeography, evolution, and conservation in forest-associated Pacific Northwest salamanders

    Creator:
    Wagner, R. Steven
    Abstract:
    Phylogeographic studies of six Pacific Northwest forest-associated salamanders provide insight into historical and contemporary processes on population genetic structure. Among Larch Mountain Salamanders (Plethodon larselli), cytochrome b mitochondrial (mtDNA) sequences (381 bp) and random amplified polymorphic DNA (RAPDs; 34 loci) supported separate Management Units for northern and southern populations (12...
    Resource Type:
    Dissertation
    Full Text:
    Andy Blaustein for all their help. Tom Mullins has been a great friend throughout my graduate career

  • 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
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    with both Bob and Andy on the same committee. In the same vein, Virginia Weis has been incredibly