Index Catalog // ScholarsArchive@OSU

A systems classification of watersheds and streams

Creator:: McCullough, Dale A.
Abstract:: Adequate management and scientific investigation of ecosystems depends on classification of landscape systems based on all significant bio-physical and associated cultural properties. The present classification is a hierarchical systems design that can be modeled in terms of a natural system interacting with its level-specific environment. A watershed system in this...
Resource Type:: Dissertation

A theory of resource utilization

Creator:: Booty, William Michael
Resource Type:: Masters Thesis

Classification of Icelandic watersheds and rivers to explain life history strategies of Atlantic salmon

Creator:: Gudjonsson, Sigurdur
Abstract:: A hierarchical classification system of Iceland's watersheds and rivers is presented. The classification is based on Iceland's substrate, climate, water, biota, and human cultural influences. The geological formations of Iceland are very different in character depending on their age and formation history. Three major types of formations occur: Tertiary, Plio-Pleistocene,...
Resource Type:: Dissertation

Contextual systems description of an Oregon coastal watershed

Creator:: Goetze, Brigitte
Abstract:: Many resource management controversies indicate disagreement about the possible intended and unintended effects of management actions on ecosystems. Researchers have documented a variety of negative effects on specific ecosystems, e. g. the degradation of salmonid habitat due to mass wasting (Hagans et al. 1986). While the effects of some management...
Resource Type:: Dissertation

Density dependent relationships in trophic processes of simplified stream communities

Creator:: Brocksen, Robert W
Resource Type:: Dissertation

Effects of beaver on stream channels and coho salmon habitat, Kenai Peninsula, Alaska

Creator:: Sanner, Carol Jo
Resource Type:: Masters Thesis

Effects of dieldrin on the intrinsic rate of increase of the guppy, Poecilia reticulata Peters

Creator:: Roelofs, Terry Dean
Resource Type:: Dissertation

Effects of perturbation on community structure and organization in aquatic microcosms

Creator:: Finger, Susan Everett
Abstract:: Aquatic communities consisting of guppies, amphipods, copepods, snails, nematodes, rotifers, protozoans, euglenoid flagellates, and other microorganisms were established in sixteen laboratory microcosms. Guppies were exploited at four different levels (0 percent, 10 percent, 20 percent, and 40 percent of the population biomass) with four communities at each level of exploitation....
Resource Type:: Masters Thesis

Effects of primary treated and biologically stabilized kraft mill effluents on the production, biomass and growth rates of juvenile salmonids in three stream channels

Creator:: Borton, Dennis Leland
Resource Type:: Dissertation

Effects of rotenone treatment on the fauna of the Green River, Wyoming

Creator:: Binns, Niles Allen
Resource Type:: Masters Thesis

Evidence for the nonessentiality of ascorbic acid in the diet of the rainbow trout, Salmo gairdneri

Creator:: Primbs, Edward R. J.
Abstract:: Numerous tests were applied to rainbow trout of eleven months of age to determine whether ascorbic acid is an essential element of the diet of these fish. Although previous work had been done on this question, conflicts in the results, the large reliance upon abnormal symptoms such as lordosis and...
Resource Type:: Masters Thesis

Generative grammars that simulate ecological systems

Creator:: Haefner, James W.
Resource Type:: Dissertation

Geomorphic influences on habitat formation, distribution, and development and the classification of upland coastal Oregon streams

Creator:: Hurley, Michael D.
Abstract:: A framework is presented for a more causal explanation and ordering of stream characteristics than traditional means have used. Patterns of stream habitat distribution are related to particular characteristics of the geomorphology of watersheds. Variability in stream characteristics can be explained by the spatial distribution of properties of the watershed...
Resource Type:: Masters Thesis

Growth and production of salmonids exposed to a stabilized Kraft mill effluent in experimental stream channels

Creator:: Mower, Barry Francis
Abstract:: The growth and production of brown trout, Salmo trutta Linnaeus, exposed to a concentration of 0.65 mg/l BOD (4.1 percent by volume) stabilized kraft mill effluent (KME) were studied from October 1973 until May 1974 in three experimental stream channels located near a kraft mill in Albany, Oregon. Growth rate...
Resource Type:: Masters Thesis

Influence of temperature on energy and material utilization by juvenile coho salmon

Creator:: Averett, R. C.
Resource Type:: Dissertation

Life history and evolutionary adaptation of Pacific salmon and its application in management

Creator:: Wevers, Mary Jo
Abstract:: An approach to understanding and managing anadromous salmon, steelhead, and sea-run cutthroat trout (Oncorhynchus spp.) based on life history and evolutionary adaptive capacities of species and stocks is presented. Species, stocks, and local populations are viewed as systems that are continuously adapting to changing environmental conditions. They have the potential...
Resource Type:: Dissertation

Life history patterns of two allopatric clupeids : Atlantic menhaden (Brevoortia tyrannus) and gulf menhaden (B. patronus)

Creator:: Powell, Allyn B.
Abstract:: Atlantic menhaden, compared to gulf menhaden, exhibit a life history pattern that appears to be adapted to a more unpredictable reproductive environment. From experiments on laboratory-reared eggs and larvae, Atlantic menhaden have larger eggs with larger yolk volume. They are larger at hatching, utilize their yolk faster, begin feeding at...
Resource Type:: Dissertation

Life history strategies and tactics of striped bass (Morone saxatilis) Walbaum

Creator:: Eldridge, Maxwell B.
Abstract:: Traditional approaches to research and management of striped bass have tended to be mechanistic, numerically oriented, and based on limited life history information. In the study presented here, comprehensive conceptual perspective was used in a multivariate study of life history and evolutionary adaptation of 10 striped bass populations representing the...
Resource Type:: Dissertation

Organization and the adaptation of aquatic laboratory ecosystems to resource availability, exploitation, and a toxicant

Creator:: Woltering, Daniel Mark
Abstract:: Organization and the adaptation of aquatic laboratory ecosystems to resource availability, exploitation, and a toxicant were examined in a 34-month study. Sixteen 560-liter microcosms including prey, predator, and competitor populations were employed over a wide range of energy and habitat resource availability and exploitation of the top predator. Chronic exposure...
Resource Type:: Dissertation

Reproductive behavior of the threespine stickleback exposed to chloramines

Creator:: Carlson, Anthony R.
Resource Type:: Masters Thesis

Resource partitioning and reproductive success of three species of hawks (Buteo spp.) in an Oregon prairie

Creator:: Cottrell, Marcy Jean
Abstract:: In a native prairie of Oregon (363 km²) red-tailed (Buteo jamaicensis), ferruginous (Buteo regalis), and Swainson's hawks (Buteo swainsoni) coexist in one of the highest nesting Buteo densities in North America. In 1979 and 1980, the distribution, density, and productivity of the three species was studied in relation to availability...
Resource Type:: Masters Thesis

Some effects of dissolved oxygen concentration on feeding, growth and bioenergetics of juvenile Coho salmon

Creator:: Thatcher, T. O.
Abstract:: The effects of three levels of dissolved oxygen (8, 5 and 3 mg/l) upon the feeding, growth and bioenergetics of juvenile coho salmon, Oncorhynchus kisutch (Walbaum), were determined in laboratory studies. Experiments with individual fish were conducted during the summer, fall and spring to measure rates of food consumption, standard...
Resource Type:: Dissertation

Some effects of life stage, temperature, pH and alkalinity on the acute toxicity of inorganic chloramines to young Coho salmon (Oncorhynchus kisutch)

Creator:: Lamperti, Larry Phillip
Abstract:: Acute toxicity bioassays (96-hr TL₅₀) were employed to determine the tolerance of coho salmon (Oncorhynchus kisutch) to inorganic chloramines at the alevin (yolk sac fry), yolk absorption, and early juvenile life stages. Any influence of changes in temperature, pH, and total alkalinity on the tolerance of juvenile coho for chloramines...
Resource Type:: Masters Thesis

Temperature and the bioenergetics of Cichlasoma bimaculatum

Creator:: Sethi, Hari Singh
Abstract:: One means of evaluating the temperature requirements of an animal is to determine changes temperature causes in the uses and losses of energy and materials in the food the animal consumes. To develop energy budgets for cichlids (Cichlasoma bimaculatum) at different temperatures (20, 24, 28, 32 and 36 C) data...
Resource Type:: Dissertation

Temperature, interspecific competition, and the production of juvenile salmonids in experimental stream communities

Creator:: Hughes, Robert M.
Resource Type:: Dissertation

The development and maintenance of stream community structure and organization

Creator:: Wevers, Mary Jo
Abstract:: The goal of this study was to better understand stream communities through a perspective that might make their structure, organization, and development more understandable. This goal was approached through the following objectives: 1. To determine the assemblages of stream organisms and define subsystems within a stream community. 2. To explain...
Resource Type:: Masters Thesis

The dynamics of exploited guppy populations exposed to dieldrin

Creator:: Liss, William J.
Abstract:: Sixteen populations of guppies (Poecilia reticulata) were established in laboratory aquariums. Eight populations were exposed to dieldrin at a mean concentration of 0.525 ppb in the water and 2.11 ppm in the food, tubificid worms. Eight populations received control water and food. All populations were fed three grams of tubificid...
Resource Type:: Masters Thesis

The effects of sewage on the distribution and abundance of benthic animals in a Puget Sound bay

Creator:: Shapeero, William L.
Abstract:: The effects of discharged sewage on physico-chemical conditions and the distribution and abundance of marine benthic animals were studied in Shilshole Bay, a part of Puget Sound, off Seattle, Washington. For over 50 years prior to 1965, when this study was initiated, 87,300 pounds (32,400 pounds BOD) per day of...
Resource Type:: Dissertation

The effects of temperature and food availability on energy partitioning and growth in the pacific oyster Crassostrea gigas (Thunberg)

Creator:: Malouf, Robert E.
Resource Type:: Dissertation

The lethal and sublethal effects of a zirconium process effluent on juvenile salmonids

Creator:: Wilson, Everett F.
Abstract:: Acute toxicity bioassays and growth studies, with juvenile salmon as test animals, were used to identify and characterize the major toxic components of a zirconium process effluent (ZPE) produced by Teledyne Wah Chang Albany Corporation. The major toxic component of the ZPE is ammonia. Although other components of the ZPE...
Resource Type:: Masters Thesis

Toward a general theory of exploitation of fish populations

Creator:: Liss, William J.
Abstract:: A possible form of a theory of exploitation of fish populations was examined. The exploitation theory was derived from a theory of community dynamics that represents the interactions between populations in a biological community with complex interrelated systems of isoclines on phase planes. The isocline systems are deduced, with a...
Resource Type:: Dissertation

Trophic and habitat requirements of two deposit-feeding stream invertebrates, Ptychoptera townesi (Diptera) and Paraleptophlebia spp. (Ephemeroptera)

Creator:: Mattingly, Rosanna
Abstract:: Ptychoptera townesi (false crane fly, Diptera) occur in high densities in an experimental stream section that has not been allowed to exceed bankfull flow for more than two decades, but are quite rare in areas both upstream and downstream from this section. By contrast, Paraleptophlebia spp. (mayfly, Epherneroptera) are relatively...
Resource Type:: Dissertation

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