Index Catalog // ScholarsArchive@OSU

Biological studies on the hemoflagellates of Oregon marine fishes and their potential leech vectors

Creator:: Burreson, Eugene Michael
Abstract:: Of 2,122 marine fishes belonging to 36 species collected in the vicinity of Newport, Oregon, 541 belonging to 8 species were infected with hemoflagellates. Four species of trypanosomes and three species of cryptobias were found in offshore fishes, but no hemoflagellates were observed in fishes from Yaquina Bay. Trypanosoma pacifica...
Resource Type:: Dissertation
Full Text:: VECTORS Abstract approved: . Robert E. Olson Of 2122 marine fishes belonging to 36 species collected in

The biology of two species of Echinorhynchus (Acanthocephala) from marine fishes in Oregon

Creator:: Miller, Richard Leo
Resource Type:: Dissertation
Full Text:: research and graduate program will always be appreciated. I am indebted to Dr. Robert E. Olson

Biology of the microsporidan parasite, Pleistophora sp., in three species of Crangonid sand shrimp

Creator:: Breed, Gail Miner
Abstract:: The microsporidan Pleistophora sp. is a common parasite of Crangon franciscorum, C. nigricauda, and C. stylirostris in the vicinity of Yaquina Bay, Oregon. Characteristics of the parasite are described. Skeletal muscle was the only host tissue infected. The seasonal prevalence and intensity of the parasite in crangonids are described, based...
Resource Type:: Masters Thesis
Full Text:: PARASITE, PLEISTOPHORA SP., IN THREE SPECIES OF CRANGONID SAND SHRIMP Abstract approved: Robert E. Olson

Evolutionary and ecological interactions affecting seaweeds

Creator:: Olson, Annette M.
Abstract:: The term "interaction" in evolutionary biology and ecology describes the relationships among variables in two classes of causal models. In the first, "interaction" refers to the influence of a single putatively causal variable on a variable of interest. In the second class of models, the term applies when a third...
Resource Type:: Dissertation
Full Text:: seaweeds AN ABSTRACT OF THE THESIS OF Annette M. Olson for the degree of Doctor of Philosophy in

Early succession in beds of the red alga, Iridaea cornucopiae Post. & Rupr. (Gigartinaceae) : alternate pathways

Creator:: Olson, Annette M.
Abstract:: Multiple successional sequences have been observed following disturbance in communities on marine hard substrata. Observations of the turf-forming alga, Iridaea cornucopiae Post. & Rupr. (Gigartinaceae), suggest that I. cornucopiae may assume its dominance by its ability to vegetatively pre-empt space. High limpet densities in the natural community, suggest that I....
Resource Type:: Masters Thesis
Full Text:: . Olson for the degree of Master of Science in Zoology presented on May 13, 1985 Title: Early Succession

Parasites of the grunion, Leuresthes tenuis (Ayres)

Creator:: Olson, Andrew Clarence
Resource Type:: Dissertation
Full Text:: ) PARASITES OF THE GRUNION, LEURES'l'BES TENUIS (AYRES) -. by ANDREW CLARENCE OLSON, JR. A THESIS

The ecological and behavioral dynamics of breeding in three sympatric anuran amphibians

Creator:: Olson, Deanna H.
Abstract:: Breeding ecology and behavior were investigated in a field study of three sympatric anuran amphibians in the Oregon Cascade Mountains: the western toad (Bufo boreas), the Cascades frog (Rana cascadae) and the Pacific treefrog (Hyla regilla). A comprehensive study of the western toad mating system was conducted at three populations...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE THESIS OF Deanna H. Olson for the degree of

Larval ecology of Pandalus jordani Rathbun

Creator:: Rothlisberg, Peter Charles
Resource Type:: Dissertation
Full Text:: , William G. Pearcy, Robert E. Olson, Christopher J. Bayne and Charles E. Warren, I owe a great deal of

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

Host Identity Matters in the Amphibian-Batrachochytrium dendrobatidis System: Fine-Scale Patterns of Variation in Responses to a Multi-Host Pathogen

Creator:: Gervasi, Stephanie, Gondhalekar, Carmen, Olson, Deanna H., and Blaustein, Andrew R.
Abstract:: Species composition within ecological assemblages can drive disease dynamics including pathogen invasion, spread, and persistence. In multi-host pathogen systems, interspecific variation in responses to infection creates important context dependency when predicting the outcome of disease. Here, we examine the responses of three sympatric host species to a single fungal pathogen,...
Resource Type:: Article
Full Text:: may be mediated through intrinsic host traits. Citation: Gervasi S, Gondhalekar C, Olson DH

Variation in female reproductive success in amphibians

Creator:: Dyal, Leslie A.
Abstract:: My dissertation focuses on the factors that influence variation in female reproductive success in plethodontid salamanders and in toads. Variation in reproductive success fuels evolutionary change. Although, females often have been overlooked in studies of reproductive success due to perceived lower levels of variation when compared to variation in male...
Resource Type:: Dissertation
Full Text:: also like to thank my committee members, Deanna Olson, Paul Murtaugh, Jeff Arthur, and Bruce Coblentz

The effects of pathogens, UV-B radiation, and introduced species on amphibians in the Pacific Northwest

Creator:: Kiesecker, Joseph Michael
Abstract:: I examined two amphibian communities to assess factors that may impact amphibian biodiversity. The results suggest that the potential factors which influence the maintenance of amphibian biodiversity are multi-faceted and thus, attempts to understand these factors must reflect these complexities. I investigated factors that influenced the susceptibility of western toad...
Resource Type:: Dissertation
Full Text:: Blaustein, Bruce Menge, Joseph Beatty, Dede Olson, Gordon Reeves, and Douglas Derryberry. During my

Population and conservation genetic structure of the Cascades frog, Rana cascadae throughout the species' range

Creator:: Monsen, Kirsten J.
Abstract:: A major goal of conservation biology is to elucidate the population genetic structure in threatened species and assess the relative importance of the evolutionary forces that shape that population genetic structure. I conducted three studies in the declining amphibian Rana cascadae to assess levels of population genetic differentiation and the...
Resource Type:: Dissertation
Full Text:: , Andrew Blaustein, Deanna Olson, and Fredrick Stormshak for their support and encouragement. I would

Chemical cues and the molecular basis of olfactory chemoreception in caudate amphibians

Creator:: Kiemnec, Karen M.
Abstract:: Chemoreception is one of the dominant sensory modalities for many species of salamanders (reviewed in Chapter 2). At least seven of the ten currently recognized salamander families are known to respond to some sort of chemical cue. These responses are as varied as delaying hatching, seeking refuge, or initiating aggressive...
Resource Type:: Dissertation
Full Text:: constructive criticism I received from my graduate committee: Bob Mason, Frank Moore, Dede Olson, and Sue

Evolution of a pheromone signaling system in the salamander genus Plethodon (Amphibia: Plethodontidae)

Creator:: Picard, Amy L.
Abstract:: Animal signaling systems frequently utilize multiple traits to produce and transmit a signal. These system elements may span multiple levels of organization. Functional integration of these traits may be expected to generate concordance in evolutionary pattern among system elements, such that evolutionary change in one system component is correlated with...
Resource Type:: Masters Thesis
Full Text:: like to thank my committee - Drs. Lynne Houck, Stevan Arnold, Dede Olson and David Rogge - for their

Pheromone mechanisms and behavioral strategies for maximizing courtship success in a terrestrial salamander, Plethodon shermani

Creator:: Vaccaro, Elyse A.
Abstract:: Darwin devised the evolutionary theory of sexual selection to account for the manifold extravagances of courtship behaviors and displays. Mating interactions represent a major evolutionary process driving the elaboration, vibrancy, and peculiarity of these courtship traits. For my dissertation research, I strived to elucidate the dynamics that constitute the complex...
Resource Type:: Dissertation
Full Text:: Olson, Kathy Magnusson, and Frank Moore for their invaluable perspective and guidance throughout the

Effects of environmental stress on intertidal mussel reproduction

Creator:: Petes, Laura E.
Abstract:: Environmental stress can negatively affect the ability of organisms to reproduce. Energetic trade-offs exist in all organisms, and under stress, energy may be allocated away from reproduction and towards physiological defense and repair mechanisms. The rocky intertidal environment is ideal for investigating the influence of environmental stress, as organisms are...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Laura E. Petes for the degree of Doctor of Philosophy in

Energetics and mechanics of swing phase during terrestrial locomotion

Creator:: Nelson, Frank E.
Abstract:: Previous attempts to understand the factors affecting the energetic cost of locomotion have found a direct link between the energetic cost and the mechanical work done during periods when the limb is in contact with the ground. However, when the limb is not in contact with the ground during the...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Frank E. Nelson for the degree of Doctor of Philosophy in

Studies on some digenetic trematodes from Ritner Creek, Polk County, Oregon

Creator:: Law, Daniel Tin-Hung
Abstract:: Seven species of fresh water fishes belonging to three different families and two species of snails from Ritner Creek, Polk County, Oregon were surveyed for adult and larval trematodes. A total of seven species of trematodes representing four families was recovered from the intestine of the fishes. Of these, at...
Resource Type:: Dissertation
Full Text:: RITNER CREEK, POLK COUNTY, OREGON Abstract approved: Redacted for privacy Stuart E. Knat4o Seven

Breeding habits, embryonic thermal requirements and embryonic and larval development of the Cascade frog, Rana cascadae Slater

Creator:: Sype, William E.
Abstract:: The breeding habits and embryonic thermal requirements of the Cascade frog of Oregon, Rana cascadae Slater, are described. The limits of temperature tolerance of the pre-feeding stages are from 6° to 27°C for embryos held at constant temperatures. However, for pre-feeding embryos exposed at different developmental stages for short durations...
Resource Type:: Dissertation
Full Text:: Development of the Cascade Frog, Rana cascadae Slater by William E. Sype A THESIS submitted to Oregon

Temperature stress, gene expression, and innate immunity at the onset of cnidarian-dinoflagellate symbiosis

Creator:: Schnitzler, Christine E.
Abstract:: The intracellular mutualism between cnidarians and photosynthetic dinoflagellates (genus Symbiodinium) is responsible for the physical and trophic structure of diverse coral reef ecosystems. This relationship, based on nutrient exchange, allows for high productivity in tropical waters, which are generally nutrient-poor environments. Numerous environmental stressors currently threaten the health of corals,...
Resource Type:: Dissertation
Full Text:: ABSTRACT OF THE DISSERTATION OF Christine E. Schnitzler for the degree of Doctor of Philosophy in

Steroids regulate α2,6-sialic acid-containing glycoconjugates in murine uterine epithelium at the time of implantation

Creator:: Gaza-Bulseco, Georgeen S.
Abstract:: Sialic acids are involved in many cellular interactions. They can serve as an adhesion ligand or act as an inhibitor to cellular adhesion by charge repulsion or by masking potential ligands. Although sialic acids are implicated in the process of blastocyst implantation, their expression and regulation in uterine epithelium of...
Resource Type:: Masters Thesis
Full Text:: approved. John E. Morris / Sialic acids are involved in many cellular interactions. They can serve as an

The roles of nutrient dynamics, oceanography, and light in the structure and functioning of rocky intertidal macrophyte assemblages

Creator:: Close, Sarah L.
Abstract:: The influence of the physical environment on organisms has long been a subject of ecological research. But, the complex drivers of environmental variation, and the multiple scales at which this can occur, make studying this topic a difficult challenge. In rocky intertidal habitats, oceanographic- and climate-scale variability influence benthic communities...
Resource Type:: Dissertation
Full Text:: . ............................................................................................ 138 4.7. Mesocosm results showing the influence on Fucus of immersion time (a, c, e, g) and light

Population genetics of ranid frogs : investigating effective population size and gene flow

Creator:: Phillipsen, Ivan C.
Abstract:: This dissertation focuses on the evolutionary forces of genetic drift and gene flow in frog populations. The balance of these two forces and the force of mutation largely determine the amount of neutral genetic variation within populations as well as the degree of genetic similarity among populations. The stochastic evolutionary...
Resource Type:: Dissertation
Full Text:: per season (Olson and Leonard 1997) and explosive breeding reduces the opportunity for males to mate

The ecological consequences of the reduction of species diversity : experimental approaches

Creator:: Allison, Gary William
Abstract:: The influence of loss of diversity on community dynamics and ecosystem functioning has recently received considerable attention. Although study of biodiversity has a long history within ecology, empirical investigations exploring consequences of loss have been rare. Because many factors confound diversity comparisons, experimental manipulations of diversity offer the most direct...
Resource Type:: Dissertation
Full Text:: phenomenon that will be common in biodiversity studies: misidentification of one biodiversity component (e

Regional Contingencies in the Relationship between Aboveground Biomass and Litter in the World’s Grasslands

Creator:: O’Halloran, Lydia R., Chu, Chengjin, Bakker, Jonathan D., Davies, Kendi F., Du, Guozhen, Firn, Jennifer, Hagenah, Nicole, Hofmockel, Kirsten S., Knops, Johannes M. H., Li, Wei, Melbourne, Brett A., Borer, Elizabeth T., Morgan, John W., Orrock, John L., Prober, Suzanne M., Stevens, Carly J., Seabloom, Eric W., MacDougall, Andrew S., Cleland, Elsa E., McCulley, Rebecca L., Hobbie, Sarah, Harpole, W. Stan, and DeCrappeo, Nicole M.
Abstract:: Based on regional-scale studies, aboveground production and litter decomposition are thought to positively covary, because they are driven by shared biotic and climatic factors. Until now we have been unable to test whether production and decomposition are generally coupled across climatically dissimilar regions, because we lacked replicated data collected within...
Resource Type:: Article
Full Text:: . Borer2, Eric W. Seabloom2, Andrew S. MacDougall3, Elsa E. Cleland4, Rebecca L. McCulley5, Sarah Hobbie2

All hosts are not created equal : variation in amphibian responses to an emerging fungal pathogen and why it matters

Creator:: Gervasi, Stephanie S.
Abstract:: Emerging infectious diseases are increasing globally and are a threat to human, wildlife, and ecosystem health. The emerging fungal pathogen, Batrachochytrium dendrobatidis (Bd), or amphibian chytrid fungus, is associated with worldwide amphibian population declines and extinctions. Bd has been found on every continent where amphibians exist and has been documented...
Resource Type:: Dissertation
Full Text:: different perspective. Although not technically part of my committee, Dede Olson has been a valuable

Unpalatability as an antipredator defense in anuran larvae

Creator:: Peterson, Jeffrey A.
Abstract:: The tadpoles of several anuran species with groupforming larvae are relatively unpalatable to many of their potential predators. To more fully understand the role of palatability and its relationship to group formation as an antipredator defense in anuran amphibian larvae, I investigated the palatabilities of the larvae of three species...
Resource Type:: Masters Thesis
Full Text:: , E. Brodie, Jr., T. Farrell, D. Formanowicz, Jr., R. O'Hara, D. Olson, B. Tissot, and especially A

The role of herbivores and productivity on community structure of rocky shores of the Galapagos Islands, Ecuador

Creator:: Vinueza, Luis R.
Abstract:: Ecosystems are facing increasing threats from human related activities, such as overfishing, pollution, habitat destruction, species invasions, and diseases, among others. While oceanic islands provide natural laboratories to understand ecological and evolutionary process, they are also particularly vulnerable to these impacts, given their usual isolation from the mainland and the...
Resource Type:: Dissertation
Full Text:: multivariate ENSO index (MEI), b) water temperature c) chlorophyll a, d) primary productivity e) dry biomass

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:: Chris abandoned me. Annette Olson helped form almost all my ideas about intertidal communities. The

Hormonal, experiential and social influences on the reproductive behavior of the vole, Microtus canicaudus

Creator:: Boyd, Sunny K.
Abstract:: To quantify the reproductive behavior of male and female gray-tailed voles, Microtus canicaudus, under conditions of natural estrus, sexually experienced pairs were observed in a standardized behavior test for 10 hours. The total duration of sexual interactions averaged 223 minutes, which is considerably longer than previously published reports on microtines....
Resource Type:: Masters Thesis
Full Text:: Associate Professor of Zoology in charge of major Redacted for Privacy Chairman of Department e Zoology

An experimental test of optimal outbreeding in the harpacticoid copepod Tigriopus californicus (Baker)

Creator:: Brown, Alice F.
Abstract:: Hypotheses concerning relative costs of inbreeding and outbreeding were evaluated for the harpacticoid copepod Tigriopus californicus, which inhabits high intertidal tidepools. Field studies indicate high variation in biotic and abiotic parameters among pools. These findings coupled with previous information about very low dispersal rates and local adaptations to individual pools...
Resource Type:: Masters Thesis
Full Text:: tolerance. Members of the 'Fifth Floor' gang, especially Terry Farrell, Annette Olson, Andy Blaustein, Ken

Rocky intertidal oceanography: an association between community structure and nearshore phytoplankton concentration

Creator:: Menge, Bruce A., Daley, Bryon A., Wheeler, Patricia A., and Strub, P. Ted
Abstract:: On Oregon coastal rocky shores, filter‐feeders were relatively abundant and macrophytes were relatively scarce at Strawberry Hill, whereas opposite abundance patterns occurred at Boiler Bay. To determine whether nearshore oceanographic differences were associated with these patterns, we made shore‐based measurements of nutrient and Chl a concentrations. We used a three‐level...
Resource Type:: Article
Full Text:: Olson 1990). In marine intertidal habitats, ecologists have gained insight into causes of variation at

Host parasite relationships between deer mice (Peromyscus maniculatus) and their eimerian parasites (protozoa)

Creator:: Fuller, Claire A.
Resource Type:: Dissertation
Full Text:: and E. delicata and their deer mouse host, Peromyscus maniculatus. Deer mice shed up to 106 E

Determination of mode of death of John Day Merycoidodontidae (Oreodontidae) by populaton age structure analysis

Creator:: Brown, Melinda Elaine
Abstract:: Volcanic activity during the Tertiary has long been held responsible for the deaths and subsequent fossilization of the vertebrate populations of the John Day region in Oregon. Oreodonts as plains or savannah dwelling ruminant herbivores, were likely to have been subject to potential exposure throughout their lifetime to volcanic debris...
Resource Type:: Masters Thesis
Full Text:: -evaluation of Murie's data. J. Wildl Olson, E. C. 1980. Taphonomy: Its history and role in community

Variations in salinity tolerance in the Pacific Treefrog, Hyla regilla, in Oregon

Creator:: Roberts, James Oliver
Abstract:: Eggs, larvae and adults of the four subspecies of Hy la regilla occurring in Oregon as given by Jameson, Mackey and Richmond (1966) were collected and subjected to salt stress in a series of graded seawaters. It was found that in all cases adults were more tolerant than larvae and...
Resource Type:: Dissertation
Full Text:: survive temperatures of -5°C to -7°C for two hours while Sechtman and Olson (1941) reported normal

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:: temperature (a, d, & h) and chlorophyll-a (b, e, & i) from MODIS-Aqua, and cross-shore temperature profiles

The effects of multiple pathogens on amphibians in the Pacific Northwest

Creator:: Romansic, John M.
Abstract:: The earth is undergoing a “biodiversity crisis” characterized by loss of populations, species, genetic diversity, and ecosystem services. Part of this crisis consists of population declines, extinctions, and increased incidence of deformities in amphibians. It is unknown whether deformities contribute to these declines. Many cases of population declines in amphibians...
Resource Type:: Dissertation
Full Text:: encouragement. Dede Olson and David Wake and the IRCEB amphibian disease research consortium, especially

Surfgrasses (Phyllospadix spp.) as dynamic foundation species for macroinvertebrates along the Oregon coast

Creator:: Moulton, Orissa M.
Abstract:: Foundation species are important components of ecosystems because they provide habitat and ameliorate stressful conditions for residents. This thesis considers the role of surfgrasses (Phyllospadix spp.) as dynamic foundation species on the coast of Oregon in two studies. Chapter 2, which presents an observational survey of two Phyllospadix congeners, investigates...
Resource Type:: Masters Thesis
Full Text:: . Poole, J. Henderson, E. Eng, J. Bailey, K. Anderson). M. Prechtl and D. Kraft were patient and

The acute effects of stress on plasma proteins of rainbow trout, Oncorhynchus mykiss

Creator:: Demers, Nora Egan
Resource Type:: Masters Thesis
Full Text:: Reno, Prudy Caswell-Reno, Bob Olson, Rich Childers and Bill Kelleher. Financial support was also

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
Full Text:: Weber for generously providing laboratory space at Hatfield Marine Science Center, and Bob Olson, Tony

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:: , in particular, has been heated (see Thomas and Olson 1980; Bennett and Ruben 1986; Czerkas and Olson

Host-parasite relationships of the staghorn sculpin Leptocottus armatus Girard in Oregon

Creator:: Burreson, Eugene Michael
Abstract:: The staghorn sculpin Leptocottus armatus is abundant in the Yaquina Bay estuary on the central Oregon coast and also occurs offshore in shallow water. A total of 560 L. armatus were collected at three locations in Yaquina Bay and between 7 and 11 kilometers offshore in depths of 40 to...
Resource Type:: Masters Thesis
Full Text:: Science Center. I wish to thank Dr. Robert E. Olson, Research Associate, Department of Zoology, for

Advancing marine reserve science : from field experiments to marine conservation planning tools

Creator:: Leslie, Heather M.
Abstract:: This dissertation focuses on science relevant to the design and implementation of marine reserves. The chapters explore a range of topics related to among-site variation in population, community, and ecosystem dynamics. My results demonstrate the value and feasibility of integrating this knowledge into more comprehensive conservation and management approaches. While...
Resource Type:: Dissertation
Full Text:: (Fig. 2.2B; Table A2, e: F=5.840, P=0.039, df=2, 6). 17 Table 2.1. Barnacle densities in the three

Bottom-up and top-down forces in tidepools : the influence of nutrients, herbivores, and wave exposure on community structure

Creator:: Nielsen, Karina Johanna
Abstract:: The relationship between nutrients and community structure is poorly understood in open-coast habitats. I created a system of artificial tidepools, of identical age and physical dimensions, at two sites that differed in wave exposure, and manipulated nutrient levels and the abundance of herbivores. Using these unique field mesocosms, I explored...
Resource Type:: Dissertation
Full Text:: complexity (such as omnivory) is common, and therefore that generalizations with respect to trophic -E

The algal symbionts of the solitary green sea anemone Anthopleura xanthogrammica

Creator:: Hartman, Michael Colyn
Abstract:: The anemone Anthopleura xanthogrammica varies in color from bright green to muddy brown. However, individuals found in caves are white. White specimens of Anthopleura xanthogrammica collected from dark caves along the Oregon coast were subjected to various experiments to determine if these cave dwelling animals carried any cells of the...
Resource Type:: Masters Thesis
Full Text:: . Olson for Michael Colyn Hartman ACKNOWLEDGEMENTS Expression of appreciation is hereby given to: Dr

The effects of parasites on host behavior : who benefits?

Creator:: Lefcort, Hugh G.
Abstract:: Some parasites may modify the behavior of their hosts. Altered behaviors may: 1) benefit the host in that they defend against the pathogen, 2) benefit the pathogen and represent manipulations of the host response, and 3) benefit neither the host or the pathogen and simply be a product of the...
Resource Type:: Dissertation
Full Text:: season (weeks); (E) size (total length in mm); and (F) altitude of capture (m). These data were

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:: - watching. Annette Olson, Peter van Tame len and Brian Tissot helped me to form ideas and design the

Environmental influences on host-pathogen dynamics of the amphibian chytrid fungus

Creator:: Buck, Julia C.
Abstract:: The causes of the global biodiversity crisis are varied and complex. Anthropogenic threats may act in isolation, or interact additively or synergistically with each other or with natural stressors to affect sensitive taxa. The recent emergence of many infectious diseases in wildlife has brought attention to the role of disease...
Resource Type:: Dissertation

An investigation of the alarm response in anuran amphibian larvae

Creator:: Hews, Diana K.
Abstract:: The results of my research suggest that tadpoles of the Western toad (Bufo boreas) and the Cascades frog (Rana cascadae) display an alarm response to chemicals from injured conspecific tadpoles. Furthermore, results suggest that the Bufo boreas alarm response can be elicited by a natural predator when it feeds on...
Resource Type:: Masters Thesis
Full Text:: maTheir'' RedaCted for privacy Chairman of Department of Z.. ogy Redacted for privacy Dean of Grad a e

Habitat distributions of birds and mammals in Lositne Canyon, Wallowa Mountains, northeast Oregon

Creator:: Sturges, Franklin Wright
Resource Type:: Dissertation
Full Text:: S S tethods. . . . . . . . s s s e e 1G General egetation ?eatures. . . . . . . . . . . . . lb

The effects of predation on anuran metamorphosis

Creator:: DeVito, Jill
Abstract:: Many organisms with complex life cycles undergo transition periods associated with increased vulnerability to predation. Several evolutionary adaptations have been proposed as antipredator defenses for organisms during risky transition periods. These include: shortening of the transition period, parental care, cryptic coloration, and synchrony of risky transitions with large numbers of...
Resource Type:: Masters Thesis
Full Text:: ., Olson 1989). Another possible mechanism that may facilitate synchronous metamorphosis in the field

New insight into the morphology and physiology of Mesozoic archosaurs

Creator:: Jones, Terry D.
Abstract:: Inferences regarding the biology of extinct taxa are often founded primarily on cladistically-based phylogenetic hypotheses. However, these inferences are frequently inconsistent with the morphology and physiology of modern animals. I suggest that reference to the biology of modern animals might be a more appropriate tool to aid in the reconstruction...
Resource Type:: Dissertation
Full Text:: , Don Henderson, Jaap Hillenius, Evgeny Kurochkin, Paul Maderson, Larry Martin, and Storrs Olson for

Seasonal thermoregulation in the dark-eyed junco (Passeriformes: Junco hyemalis)

Creator:: Swanson, David Leslie
Abstract:: Winters in north-temperate climates impose high thermogenic demands upon small birds which are met by seasonal acclimatization. This thesis investigates the extent and mechanisms of seasonal acclimatization in darkeyed juncos (Junco hyemalis) inhabiting western Oregon. Although insulation is significantly increased in winter, acclimatization is primarily metabolic. Increased metabolism is required...
Resource Type:: Dissertation
Full Text:: 1983a). Birds apparently do not possess brown fat (Johnston, 1971; Olson et al. 1988; Saarela et al

Marine herbivore-plant interactions : the feeding ecology of the sea slug Placida dendritica

Creator:: Trowbridge, Cynthia D.
Abstract:: The feeding ecology of a common temperate mesoherbivore, the oligophagous sea slug Placida dendritica (Gastropoda: Opisthobranchia: Ascoglossa), was examined from April 1985 to June 1989. Along the central coast of Oregon, Placida consumed three host species: the low intertidal green algae Codium setchellii, C. fragile, and Bryopsis corticulans. Individual slugs...
Resource Type:: Dissertation
Full Text:: . Discussions with Teresa Turner, Terry Farrell, Annette Olson, Mark Wilson, Peter McEvoy, John Chapman, and

Phytoplankton shading of marine benthic macrophytes: Implications for intertidal community structure

Creator:: Kavanaugh, Maria T.
Abstract:: Previous observations of light levels and phytoplankton abundances along the Oregon coast demonstrated that phytoplankton attenuated light sufficiently to potentially limit the growth of intertidal macrophytes and therefore structure local intertidal communities. Inspired by this observation, in spring 2004, I initiated a study to quantify the direct and indirect benthic...
Resource Type:: Masters Thesis
Full Text:: calculated using the following equation: I x = Io e –Kd z where Io is the surface irradiance derived from

Vertebrates of the middle Oregon coast strip

Creator:: Pimentel, Richard A.
Resource Type:: Masters Thesis
Full Text:: . . . ... a . ,* . . a. . . a . . . . a el.I p a a a. a p e p a... a ........... 35 Introduction

The distribution of amphibians and reptiles of Wallowa County, Oregon

Creator:: Ferguson, Denzel
Resource Type:: Masters Thesis
Full Text:: Plate 3 . . . 1k Plate k . . . . . ...... 1k Cllina t e . . . . ...... . . . . . 15 Vegetation

Immediate effects of acute stress on innate immunity in rainbow trout (Oncorhynchus mykiss)

Creator:: Demers, Nora Egan
Abstract:: This thesis tests the hypothesis that innate immunity may be enhanced immediately following a stressful event. The experiments characterize the acute effects of the fight or flight response on some immunological and endocrine parameters in rainbow trout (Oncorhynchus mykiss). Plasma cortisol and catecholamines were elevated within seconds of the initiation...
Resource Type:: Dissertation
Full Text:: , 1989b). Injection of E. coli lipopolysaccharide (LPS) and rapid increases in water temperature (both

Multiple stressors and amphibian population declines

Creator:: Hatch, Audrey C.
Abstract:: In the past decade, declines in amphibian populations have captured scientific and popular interest. The causes of the declines are likely to be complex and involve interactions between several environmental stressors. Using multifactorial experiments, I investigated the combined effects of several anthropogenic stressors on developing amphibians in Oregon, USA. In...
Resource Type:: Dissertation
Full Text:: and Olson 1990; Menge and Sutherland 1987; Connell and Sousa 1983; Andrewartha and Birch 1954

Larval dispersal in marine fishes: novel methods reveal patterns of self-recruitment and population connectivity

Creator:: Christie, Mark R.
Abstract:: Many marine fish populations are severely declining due to over-fishing, loss of both juvenile and adult habitats, and accelerating environmental degradation. Fisheries management and the implementation of marine protected areas (MPAs) and other conservation tools are currently hindered by large gaps in knowledge about larval dispersal and its subsequent effects...
Resource Type:: Dissertation

Heat-shock protein expression in Mytilus californianus : seasonal and tidal height comparisons

Creator:: Roberts, Deirdre
Resource Type:: Masters Thesis
Full Text:: collecting mussels on several very early mornings. Mussel tissue temperatures were also measured by E

Population dynamics of coral-reef fishes : spatial variation in emigration, mortality, and predation

Creator:: Overholtzer-McLeod, Karen L.
Abstract:: Understanding the dynamics of open marine populations is difficult. Ecological processes may vary with the spatial structure of the habitat, and this variation may subsequently affect demographic rates. In a series of observational and experimental studies in the Bahamas, I examined the roles of emigration, mortality, and predation in the...
Resource Type:: Dissertation
Full Text:: centimeters to 100's of kilometers, especially for open marine populations (Menge and Olson 1990). Even local

Avifaunal habitats in the central coast mountains of western Oregon

Creator:: Bratz, Robert Davis
Resource Type:: Masters Thesis
Full Text:: . . . . . . . . . . . . . . . . . . . . . I The Problem . . . . . . . . . . . . . . . . . . . i P ' - _ti flL',.G. s e a . a a a a s s t

The swimming response of the Sacconereis stage of Autolytus varius to changes in hydrostatic pressure

Creator:: Smith, Randall William
Abstract:: The syllid polychaete Autolytus varius reproduces in the spring and early summer in Yaquina Bay, Oregon, The fertilized female epitokes, or Sacconereis, carry the developing eggs and larvae in a ventral sac until the larvae are ready to be released; incubation lasts 14 to 18 days in the laboratory, The...
Resource Type:: Masters Thesis
Full Text:: Dean of Graduate School Date thesis is presented MAY 9 196, Typed by Donna L. Olson for Randall

Neurobiology of stress : central actions of corticotropin-releasing factor in an amphibian

Creator:: Lowry, Christopher
Resource Type:: Dissertation
Full Text:: of Research. Finally, I thank my family. I thank my parents, Charles E. and Sandra J. Lowry for the

Modulation of respiratory burst activity of trout (Oncorhynchus mykiss) phagocytic cells

Creator:: Galvan, Irja S.
Abstract:: In a comparison of the mammalian and fish immune systems many similarities and differences are found. While most of the differences occur in the acquired or lymphoid arm of immunity, the nonlymphoid immune systems of fish and mammals share many similarities. For instance, both animal groups use phagocytic neutrophils and...
Resource Type:: Dissertation
Full Text:: their structure (Lobb and Olson, 1988). Different L chains also exist in catfish. With the use of mAb

Algal community structure and organization in high intertidal rockpools

Creator:: van Tamelen, Peter G.
Abstract:: Gradients of physical disturbance are central to theories of community organization yet rarely are studies performed in which physical factors are experimentally manipulated. Pothole tidepool algal communities exhibit distinct zonation patterns from top to bottom that result from scouring by rocks and other debris in the pools. Scouring is easily...
Resource Type:: Dissertation
Full Text:: , Ron Liedich, Annette Olson, Jeff Peterson, Kim Van Zwalenburg, and Ken Yates. Brian Tissot made the

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:: . californianus (B), M. trossulus (C), B. glandula (D), C. dalli (E), P. polymerus (F), S. cariosus (G), and

Patterns and dynamics of context-dependency in the marine rocky intertidal

Creator:: Berlow, Eric Layani
Abstract:: As ecologists are being called upon to predict the consequences of human perturbations to natural communities, an important goal is to understand what factors drive variability or consistency in nature. In the rocky intertidal of San Juan Island, Washington, a comparative experimental approach was used to investigate spatial and temporal...
Resource Type:: Dissertation
Full Text:: Nielsen, Annette Olson, Deirdre Roberts, Eric Sanford, Cynthia Trowbridge, and Peter van Tame len have

Osmotic and ionic regulation in the earthworm Lumbricus terrestris

Creator:: Dietz, Thomas Howard
Abstract:: Earthworms are capable of osmotic and ionic regulation while living in a dilute balanced salt solution. When transferred from soil to pond-water (PW) their body weight increases by 15 percent due to a net uptake of water. This results in an initial dilution of the coelomic fluid (CF). Subsequently, Na...
Resource Type:: Dissertation
Full Text:: by Donna L. Olson for Thomas Howard Dietz ACKNOWLEDGMENT I am grateful to Dr. Ronald H. Alvarado

A green algal symbiont in Clinocardium nuttallii

Creator:: Hartman, Michael Colyn
Abstract:: Clinocardium nuttallii from Yaquina Bay, Oregon, were found to harbor an algal symbiont in the siphon, mantle and occasionally the foot tissues. Approximately 35 percent of the population in the study area was infected to some degree with the alga; however, no cockles under two years of age were infected....
Resource Type:: Dissertation
Full Text:: micrographs included in the thesis. Dr. Robert Olson at the Marine Science Center collected, packaged and

Morphological and endocrine correlates of dominance in male ring-necked pheasants (Phasianus colchicus)

Creator:: Lumas, Kathy A.
Abstract:: An investigation of the correlation between a number of behavioral, morphological and physiological parameters and dominance status of male Ring-necked Pheasants (Phasianus colchicus) was undertaken. Dominant males performed significantly more aggressive behaviors than subordinates and a higher proportion of these behaviors was directed toward distantly ranked subordinates. Animals could also...
Resource Type:: Masters Thesis
Full Text:: L. Moore, Associate Professor of Zoology in charge of major Redacted for Privacy Charles E. King

Ecological aspects of kin discriminating behavior with implications of functional value

Creator:: Hokit, D. Grant
Abstract:: To assess the context dependence of kin discriminating behavior, I examined kin-biased aggregation behavior in tadpoles of R. cascadae in different ecological conditions. I manipulated food distribution, predator presence, thermal heterogeneity, and relatedness in a multifactorial mesocosm experiment. All four factors interacted to influence tadpole dispersion. My results suggest that...
Resource Type:: Dissertation
Full Text:: Beatty and Dede Olson have truly provided me with wonderful advice, funding at times, and many field

Macroscale to local scale variation in rocky intertidal community structure and dynamics in relation to coastal upwelling

Creator:: Freidenburg, Tess L.
Abstract:: Understanding how large-scale processes (>100 kms) influence ecological communities is currently a major focus in ecology. In marine systems, coastal upwelling, a large-scale oceanographic process in which surface water pushed offshore by winds is replaced by cold, nutrient-rich water from depth, appears to cause variation in rocky intertidal communities. Along...
Resource Type:: Dissertation
Full Text:: local to regional processes (Menge and Olson 1990, Levin 1992). Researchers are examining the roles of

Some digenetic trematodes of Oregon's tidepool cottids

Creator:: Hall, James Raymond
Abstract:: The host fish for this study were collected from January through June of 1965. Tidepools were selected at Bar View, Cape Arago, Neptune State Park, Seal Rock, and Yaquina Head. Of the 187 fish examined, 132 were infected. The following host fishes yielded the following parasites. New Host records are...
Resource Type:: Masters Thesis
Full Text:: Dean of Graduate School Date thesis is presented r Typed by Donna Olson for James Raymond Hall

Experimental analysis of competition between desert rodents in Oregon

Creator:: Schoffelen, Emile
Resource Type:: Masters Thesis

Bridging environmental physiology and community ecology : temperature effects at the community level

Creator:: Iles, Alison C.
Abstract:: Most climate change predictions focus on the response of individual species to changing local conditions and ignore species interactions, largely due to the lack of a sound theoretical foundation for how interactions are expected to change with climate and how to incorporate them into climate change models. Much of the...
Resource Type:: Dissertation
Full Text:: ..................................................................................... 156 Appendix E – Temporal trends in the annual mean and intra-annual distribution of upwelling

Life cycle and host specificity of Diclidophora sp. (Monogenea-Diclidophoridae), a parasite of embiotocid fishes

Creator:: Hanson, Alfred Warren
Abstract:: The life cycle of a monogenean, Diclidophora sp., was studied with special attention to the time required for developmental stages to occur. Eggs are produced by adult worms at the rate of one every 13.5 minutes and require 32 days to hatch when incubated at 12.5°C and 30.9‰ salinity. Rate...
Resource Type:: Dissertation
Full Text:: for his support, guidance, and encouragement during the course of this study; Dr. Robert E. Olson

Ultraviolet radiation as an environmental stressor of amphibians

Creator:: Bancroft, Betsy A.
Abstract:: My thesis explored the effects of and potential mediating mechanisms for an important environmental stressor, ultraviolet-B (UVB) radiation. UVB radiation has negative effects on organisms in both terrestrial and aquatic systems. I used meta-analysis to quantify the effects of UVB radiation on a diversity of aquatic organisms (Chapter 2). UVB...
Resource Type:: Dissertation
Full Text:: species observed and transect information for each field site ………………………………………………………………………. 174 E

The role of oxygen and other environmental variables on survivorship, abundance, and community structure of invertebrate meroplankton of Oregon nearshore coastal waters

Creator:: Eerkes-Medrano, Dafne I.
Abstract:: The high productivity of Eastern Boundary Upwelling Ecosystems (EBUE), some of the most productive ecosystems in the globe, is attributed to the nutrient rich waters brought up through upwelling. Climate change scenarios for coastal upwelling systems, predict an intensification of coastal upwelling winds. Associated with intensification in upwelling are biogeochemical...
Resource Type:: Dissertation
Full Text:: weekends and many nights to count larvae. Jennifer Olson, Asako Yamamuro, Satoshi Kimura, Jeremy

Prey selection by the tropical marine snail Thais melones : a study of the effects of interindividual variation and foraging experience on growth and gonad development

Creator:: West, Lani
Abstract:: I studied the feeding behavior of marked individuals of the carnivorous marine snail Thais melones in a rocky shore habitat of Pacific Panama. The population of snails consume a variety of invertebrate species such as bivalves, limpets, and polychaetes. Individuals exhibited a range of diet breadth, with some specialized, but...
Resource Type:: Dissertation
Full Text:: , Annette Olson, Richard Palmer, Peter Glynn, John Cubit, Mark Denny, Ross Robertson, John Christy

Indirect effects of ultraviolet-B radiation on larval amphibians as mediated by food quality and trophic interactions

Creator:: Scheessele, Erin A.
Abstract:: Ultraviolet-B radiation (UVB) is an abiotic stressor in both terrestrial and aquatic systems. The stratospheric ozone layer, depleted due to anthropogenic activities and the cause of elevated UVB at earth's surface over the last four decades, is predicted to recover by 2065. However, UVB levels in aquatic systems may continue...
Resource Type:: Dissertation

Cannibalism in larvae of the long-toed salamander, Ambystoma macrodactylum

Creator:: Wildy, Erica Lynn
Abstract:: Predator-prey interactions have historically been studied to explain patterns of organization observed in populations and communities. They have also been important in understanding the evolution of antipredator responses in prey and counterstrategies in predators. Despite the breadth of knowledge that exists for heterospecific interactions, relatively few studies have investigated the...
Resource Type:: Dissertation
Full Text:: of my research efforts. I would also like mention my appreciation to Dede Olson for providing help

Population genetics, ecology and evolution of a vertebrate metacommunity

Creator:: Manier, Mollie Kim
Abstract:: Population genetic structure is widespread in many organisms and can be found at small spatial scales. Fine-scale differentiation is the result of ecological and evolutionary processes working together to produce an overall pattern, but the relative importance of these factors in population differentiation is poorly understood. The goals of my...
Resource Type:: Dissertation
Full Text:: Linton, David Scott, Weezie Mead, Dede Olson, Shannon McDowell, Matt McDowell, Mike Pfrender, Melodie

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

Population and community ecology of the red alga Rhodomela larix (Turner) C. Agardh, on the central Oregon coast

Creator:: D'Antonio, Carla Marie, 1956-
Abstract:: Aspects of the life history and ecology of the intertidal turf-forming alga Rhodomela larix (Turner) C. Agardh were examined over a two year period at several sites on the Oregon coast. Rhodomela occurred over a broad tidal range and exhibited different growth and morphology characteristics with respect to tidal height....
Resource Type:: Masters Thesis
Full Text:: drafts including Teresa Turner, Harry Phinney, Annette Olson and Chris Marsh. This work would not have

A distributional study of the birds of Montana

Creator:: Davis, Clifford Vernon, 1914-
Resource Type:: Dissertation
Full Text:: Redacted for Privacy / s ê ê u I / u s s ê s s S5 . . . Chairman of Dartment of Zoo1ory Redáàted for

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:: , especially J. Seger, S. Turner, and E. Newton. Helpful comments were also provided by L. Ashkenas, A. Olson

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