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Filtering by: Creator Jackson, Patrick A. Remove constraint Creator: Jackson, Patrick A. Degree Field Zoology Remove constraint Degree Field: Zoology

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  • Exploring reproductive signaling using nonconventional aquatic models : Aging and reproductive function in killifish and sea anemones

    Creator:
    Ferguson, Lindsey G.
    Abstract:
    Aquatic animals possess surprising similarities to humans in reproductive signaling that are simplified or elaborated for life underwater, making them useful for studying reproductive control. In this thesis, killifish and sea anemones are used as models for reproductive function and aging. The aging model Nothobranchius (killifish) was used to investigate...
    Resource Type:
    Honors College Thesis
    Full Text:
    Ferguson A THESIS submitted to Oregon State University Honors College in partial fulfillment of

  • Drought, dispersal, and community dynamics in arid-land streams

    Creator:
    Bogan, Michael T.
    Abstract:
    Understanding the mechanisms that regulate local species diversity and community structure is a perennial goal of ecology. Local community structure can be viewed as the result of numerous local and regional processes; these processes act as filters that reduce the regional species pool down to the observed local community. In...
    Resource Type:
    Dissertation
    Full Text:
    : _____________________________________ David A. Lytle Understanding the mechanisms that regulate local species diversity and

  • 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:
    , Patrick Chappell is, without a doubt, the most generous faculty member I have known at OSU, who

  • Candidate Causes, Consequences, and Estimation of Individual Diet Specialization

    Creator:
    Coblentz, Kyle E.
    Abstract:
    Diet variation among individuals within populations is widespread. Often diet differences among individuals are attributable to obvious differences among individuals such as age, sex, or morphology. However, growing evidence suggests that individual diet variation is also common among seemingly identical individuals within populations. This phenomenon has been termed individual diet...
    Resource Type:
    Dissertation
    Full Text:
    specialization has been documented across a variety of taxa and biomes and theory suggests that diet

  • The effects of biomechanical and ecological factors on population and community structure of wave-exposed, intertidal macroalgae

    Creator:
    Blanchette, Carol A.
    Abstract:
    I examined the biomechanical factors that influence the sizes of intertidal macroalgae by studying a population of Fucus gardneri at Fogarty Creek Point, OR. I constructed a mathematical model to predict optimal sizes and probabilities of survival for Fucus under conditions of high and low wave exposure. Predicted optimal sizes...
    Resource Type:
    Dissertation
    Full Text:
    Carol A. Blanchette for the degree of Doctor of Philosophy in Zoology presented on August 29, 1994

  • Indirect effects of fishing on predators and their prey

    Creator:
    Stallings, Christopher Derek
    Abstract:
    Predators are fundamentally important for regulating and driving prey population dynamics as well as structuring ecological communities. Over-exploitation of marine resources has caused dramatic depletions of predatory fish species and shifts in marine community composition, with attendant declines in productivity and diversity of marine ecosystems. Despite the important ramifications of...
    Resource Type:
    Dissertation
    Full Text:
    shifts, and large-scale degradation of a Caribbean coral reef. Science 265:1547-1551. Jackson, J. B

  • Community organization and succession in rocky intertidal surfgrass beds

    Creator:
    Turner, Teresa
    Abstract:
    Succession and organization of rocky intertidal zone surfgrass beds (Phyllospadix scouleri Hook) were examined experimentally at two sites on the Oregon coast. The interaction of three attributes of the plant -- high persistence, high preemption, and slow recovery -- strongly influences the organization of surfgrass beds. Permanent plots indicate that...
    Resource Type:
    Dissertation
    Full Text:
    Surfgrass Beds Abstract approved: Redacted for Privacy Dr. Bruce A. Menge Succession and organization of

  • Nasal turbinates and the evolution of mammalian endothermy

    Creator:
    Hillenius, Willem J.
    Abstract:
    Although endothermy is one of the most significant evolutionary developments in the vertebrates, its origins among extinct taxa have traditionally been difficult to determine. Endothermy is primarily an attribute of the "soft anatomy," and its key features, such as complex lungs, elevated blood oxygen carrying capacity and mitochondrial density, do...
    Resource Type:
    Dissertation
    Full Text:
    lateral walls of the nasal cavity, which present a characteristic pattern. Studies of similar ridges in

  • Nearshore distribution of barnacle and mussel larvae and oceanographic mechanisms of onshore transport and delivery

    Creator:
    Tyburczy, Joe A.
    Abstract:
    Recruitment of larvae from the plankton is an important determinant of community structure in marine systems. In populations of many marine species, recruitment determines the basic demographic parameters of immigration, emigration, and reproduction. Moreover, the effect of recruitment as an "ecological subsidy" can determine the strength of interactions among species...
    Resource Type:
    Dissertation
    Full Text:
    DISSERTATION OF Joe A. Tyburczy for the degree of Doctor of Philosophy in Zoology presented on

  • A comparative study of prenatal behavior ontogeny in altricial and precocial murid rodents

    Creator:
    Robinson, Scott R., 1952-
    Abstract:
    Using techniques that permit the direct observation of fetuses in vivo, prenatal behavioral development was compared among four species in the rodent family Muridae: the Norway rat (Rattus norvegicus), Mongolian gerbil (Meriones unguiculatus), cotton rat (Sigmodon hispidus), and spiny mouse (Acomys cahirinus). Rattus and Meriones bear altricial offspring, as do...
    Resource Type:
    Dissertation
    Full Text:
    A comparative study of prenatal behavior ontogeny in