Index Catalog // ScholarsArchive@OSU

The conceptual development and use of ecoregion classifications

Creator:: Brewer, Isaac
Abstract:: This thesis explores the genesis of the ecoregion concept, examines the conceptual development of ecoregion classification systems, investigates applications of ecoregion classification systems for a broad range of purposes, and discusses the prospects for the further evolution of this concept. An ecoregion is an area that exhibits patterns of homogeneity...
Resource Type:: Masters Thesis

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:: Community organization and succession in rocky intertidal

Trophic relations of simplified animal communities in laboratory streams

Creator:: Davis, Gerald E.
Resource Type:: Dissertation

Early plant biomass trends following forest site preparation on the Oregon Coast Range

Creator:: Malavasi, Ubirajara Contro
Abstract:: The vegetation following forest site preparation was examined in ten clearcut units located in the western Oregon Coast Range. The site preparation techniques used in these units included scarification, slash burning, and chemical spraying. The ages of the clearcut units studied varied from one to nine growing seasons for the...
Resource Type:: Masters Thesis

A steady-state model of ecological hierarchy

Creator:: Thompson, Grant Garrison
Abstract:: A generalized mathematical model of ecosystems is developed. The model begins with the general class of systems known as state-determined systems, in which the time-derivative of each state variable is a function of some subset of the set of all system state variables and .environmental parameters. A formal basis is...
Resource Type:: Dissertation
Full Text:: Application of the Model to Selected Community Studies 126 Choice of Studies 126 A Hierarchical View of a

Qualitative analysis of the community matrix

Creator:: Dambacher, Jeffrey M.
Abstract:: This work sets forth a reformulation of Levins' loop analysis for the qualitative modeling of complex dynamical systems. Relationships between members of ecological communities can be analyzed through a qualitatively specified community matrix, whereby +1, -1, or 0 represent effects of one species upon another. A contribution is made to...
Resource Type:: Dissertation

Predicting the stability, equilibrium response, and nonequilibrium dynamics of ecological systems

Creator:: Hosack, Geoffrey R.
Abstract:: In this dissertation, new theory and its applications are developed to predict three properties of complex ecological communities: stability, equilibrium response, and non-equilibrium dynamics. First, a graph-theoretic analysis identifies the interconnections in a complex ecosystem that promote or diminish stability (Chapter 2). The hierarchy of interactions that influences stability and...
Resource Type:: Dissertation
Full Text:: Stream community of fish and invertebrates in northern Japan

Stability and complexity : a reappraisal of the Competitive Exclusion Principle

Creator:: Duran, Israel N.
Abstract:: Elton (1927) realized that, intuitively at least, nature was complex and stable. And that the last property contributed to the first. This idea was challenged mathematically by Gardner and Ashby (1970) and May (1972), and in the years following various models have attempted to reconcile these opposing views. Unlike previous...
Resource Type:: Masters Thesis
Full Text:: that ecosystem complication might stabilize a community. Within these models a system may be stable

Food web studies in an oak woodland eco-system

Creator:: Hamilton, Grace Anne
Resource Type:: Masters Thesis

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:: nutrients, herbivores, and wave exposure on community structure AN ABSTRACT OF THE THESIS OF Karina

ScholarsArchive@OSU

The conceptual development and use of ecoregion classifications

Community organization and succession in rocky intertidal surfgrass beds

Trophic relations of simplified animal communities in laboratory streams

Early plant biomass trends following forest site preparation on the Oregon Coast Range

A steady-state model of ecological hierarchy

Qualitative analysis of the community matrix

Predicting the stability, equilibrium response, and nonequilibrium dynamics of ecological systems

Stability and complexity : a reappraisal of the Competitive Exclusion Principle

Food web studies in an oak woodland eco-system

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

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