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Filtering by: Creator Pennington-Lehman, Heather Remove constraint Creator: Pennington-Lehman, Heather Degree Level Doctoral Remove constraint Degree Level: Doctoral

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  • Dynamics of the Laurentide Ice Sheet

    Creator:
    Carlson, Anders Eskil
    Abstract:
    This dissertation concentrates on the controlling factors on the instability of the Laurentide Ice Sheet (LIS) and their effects on abrupt climate change. Northern Hemisphere climate fluctuated abruptly during the last deglaciation possibly related to variability in Atlantic meridional overturning circulation (AMOC) and reduced aerial extent of the LIS. Reductions...
    Resource Type:
    Dissertation
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    meeting. June Padman, Maziet Cheseby, Heather Benway and Molly Phipps instructed me in the art of

  • Reproductive biology and behavior of the brown tree snake (Boiga irregularis) on Guam.

    Creator:
    Waye, Heather L.
    Abstract:
    While there are many more species of reptiles in the tropics than in temperate latitudes, relatively little is known about the natural history of tropical species of snakes. Even basic information, such as reproductive ecology and behavior, is lacking. Patterns of reproduction in tropical species differ from patterns in temperate...
    Resource Type:
    Dissertation
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    dissertation AN ABSTRACT OF THE DISSERTATION OF Heather L. Waye for

  • On the evolution of correlated color traits in garter snakes

    Creator:
    Westphal, Michael F.
    Abstract:
    How complex traits evolve continues to be a major focus of evolutionary investigation. A current topic of debate is the hypothesis that the phenotypic integration of complex traits gives rise to evolutionary constraints. I studied two color traits in the common garter snake, Thamnophis sirtalis, that show a high level...
    Resource Type:
    Dissertation
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    Lutterschmidt, Dr. Heather Waye, Dr. Eric Hoffman, Devon Quick, Amy Harwell, M. Rockwell Parker, Barbara Han

  • Oceanographic influences on rocky intertidal communities : coastal upwelling, invertebrate growth rates, and keystone predation

    Creator:
    Sanford, Eric (Eric David)
    Abstract:
    The influence of large-scale processes on natural communities has become one of the central issues of modern ecology. I combined field and laboratory studies to investigate the effects of variation in coastal upwelling on rocky intertidal communities along the central Oregon coast. I examined whether the growth of intertidal barnacles...
    Resource Type:
    Dissertation
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    Heather Leslie for their friendship, enthusiastic support, and countless trips to Bombs Away and Dream

  • Wide band gap semiconductors and insulators : synthesis, processing and characterization

    Creator:
    Hersh, Peter A.
    Abstract:
    The work presented here is focused on applying basic principles of solid-state chemistry to the study and development of new wide band-gap semiconductors and insulators for photovoltaic and electronic-device applications. Analysis of crystal structure, band structure, optical band gap, morphology and transport properties provides fundamental insight into materials performance as...
    Resource Type:
    Dissertation
    Full Text:
    Anderson, Jason Stowers, Heather Swinger-Platt, Joa-Young Jeong, Kai Jiang, Stephen Meyers, Sharon

  • Greater sage-grouse reproductive ecology : linkages among habitat resources, maternal nutrition, and chick survival

    Creator:
    Gregg, Michael A.
    Abstract:
    Greater sage-grouse (Centrocercus urophasianus) populations declined range wide during the past 50 years. Grouse populations were 2-3 times larger than the current population as recently as the early 1970's. In addition to habitat loss and fragmentation, declines were attributed habitat degradation that caused reduced productivity. Because chick survival remains the...
    Resource Type:
    Dissertation
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    including Gina Barr, Brian Day, Kelly Hogan, Doug Lehman, Dale Fink, Donna Fink, and Mike Webster for their

  • 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
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    wonderful colleagues to work with and learn from. Many thanks to Heather Leslie, Roly Russell, Chris

  • Geomicrobiology of marine sediment containing methane

    Creator:
    Briggs, Brandon R.
    Abstract:
    Marine sediments contain an abundance of methane that is biologically produced and plays a significant role in the global carbon cycle. Microbes responsible for the carbon cycle in marine sediments, and the processes that they carry out, need to be characterized in order to fully understand the role of this...
    Resource Type:
    Dissertation
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    , Megan Kaufman, and Heather Lavalleur for always lending an ear and for the helpful suggestions

  • Characteristics of soil organic matter in two forest soils

    Creator:
    Crow, Susan E.
    Abstract:
    Soil organic matter (SOM) is the terrestrial biosphere's largest pool of organic carbon (C) and is an integral part of C cycling globally. Soil organic matter composition typically can be traced directly back to the type of detrital inputs; however, the stabilization of SOM results as a combination of chemical...
    Resource Type:
    Dissertation
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    , successful dissertation. I've had the advantage of much help in the lab. Heather Carpenter, Dave Dinette

  • Regulation by male-specific fruitless of neural circuitry used during courtship and copulation behavior in Drosophila melanogaster

    Creator:
    Latham, Kristin Lynn
    Abstract:
    Courtship and copulation behaviors in Drosophila melanogaster males are regulated by sex-specific products from the gene fruitless (fru). Male-specific FRU proteins (FRU[superscript M]) are putative transcription factors of the BTB-ZnF family that likely act by controlling development and maintenance of the neural circuitry used during male sexual behavior. However, which...
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    Dissertation
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    foster-lab, for years of good conversation, scientific and emotional support, and camaraderie: Heather