Index Catalog // ScholarsArchive@OSU

Enhancing the predatory potential of hoverflies on aphids in Oregon broccoli fields with floral resources

Creator:: Ambrosino, Mario D.
Abstract:: Four key aspects of the relationship between predatory hoverflies and the aphid pest Brevicoryne brassicae L. on broccoli were investigated in the Willamette Valley, Oregon USA: 1) the relationship between aphid density and hoverfly oviposition, 2) the larval voracity of key hoverfly species, 3) the preferences of hoverflies and broccoli...
Resource Type:: Dissertation
Full Text:: Brevicoryne brassicae L. on broccoli were investigated in the Willamette Valley, Oregon USA: 1) the

Grazing, nutrients, and marine benthic algae : insights into the drivers and protection of diversity

Creator:: Guerry, Anne D., 1973-
Abstract:: Two of the most powerful ways in which humans have altered ecosystems are by increasing productivity and changing the densities of important consumers. The bottom-up effects of productivity and the top-down effects of consumers have been identified as primary determinants of biological diversity, though the links between them remain unclear....
Resource Type:: Dissertation
Full Text:: . Although I certainly could have used their expertise more, I thank my committee members, Peter McEvoy

Biodiversity : illustrations of some concepts, causes, and consequences

Creator:: Russell, Roland B.
Abstract:: Careful analysis and thoughtful synthesis will be necessary for expanding the envelope of ecological understanding. This work is my attempt at communicating both of these, in relation to three questions about our understanding of the structure and dynamics of biological diversity. These questions focus on a) advancing our understanding of...
Resource Type:: Dissertation
Full Text:: Lubchenco, Peter McEvoy, Bruce Menge, Phil Rossignol, and Dan Schafer; you make a pretty amazing team. Dave

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:: , and how to do transects while looking like the Michelin man - definitely warmer that way! Peter van

Diverse consumer guilds in intertidal communities of Oregon and the Republic of Panama and their effects on prey assemblages

Creator:: Gaines, Steven D.
Abstract:: Low intertidal communities of Oregon and Panama have many predator and herbivore species. This diversity of consumers is important to the organization of both communities because of qualitative differences among the consumer species in their ability to circumvent specific prey defenses. In Oregon, the red alga Iridaea cordata is protected...
Resource Type:: Dissertation
Full Text:: thesis committee, Drs. Charles King, Peter McEvoy, and Harry Phinney, for greatly improving these

Linking marine communities and ecosystems : invertebrates mediate nutrient availability in intertidal communities

Creator:: Bracken, Matthew E.
Abstract:: While community ecologists have traditionally focused on local-scale processes, it has become apparent that a broader perspective, which explores the community-level ramifications of material fluxes within and between ecosystems, is necessary to effectively evaluate bottom-up influences on community structure and dynamics. In this dissertation, I employed ecosystem principles to understand...
Resource Type:: Dissertation
Full Text:: organic nitrogen, which is unusable by macroalgae, into ammonium, which algae readily assimilate. l

Political economy and trade effects of invasive species regulation : the case of noxious weeds

Creator:: Min, He
Abstract:: Many non-native weed pests of food, fiber, and nursery crops pose threats to U.S. environment and agriculture. Noxious weed regulations play an important role in preventing the introduction and spread of non-native plants, thereby protecting the local biodiversity, environment and economic activities. However, these regulations could also hamper agricultural trade....
Resource Type:: Dissertation
Full Text:: like to thank all my committee members, Dr. Steven T. Buccola, Dr. Peter B. McEvoy, Dr. Jeffrey J

Effects of intercropping beans with maize on angular leaf spot and rust of beans

Creator:: Boudreau, Mark Alan, 1958-
Abstract:: Experiments were performed to determine the nature of maize influence on bean disease in additive-type intercrops. Overall effects of intercrops on angular leaf spot (caused by Phaeoisariopsis griseola) in Kenya indicated >23% reductions (P<0.05) in area under the disease progress curve (AUDPC) in two of three season-site combinations. Fertilization tended...
Resource Type:: Dissertation
Full Text:: Johnson, who also provided the greater part of my "teacher's training;" Peter McEvoy, for his ecological

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:: would also like to express gratitude to my committee members, Ross Kiester, Fred Ramsey, Peter McEvoy

Spatial patterns of predaceous and phytophagous apple mites (Acari : Eriophyidae, phytoseiidae, Stigmaeidae, Tetranychidae) : intra- and interspecific relationships

Creator:: Slone, Daniel H.
Abstract:: Aggregation and species association of 9 species of phytophagous and predaceous mites were studied for 6 yr in an orchard with 100, 2 m tall 'Red Delicious' apple trees. To quantify aggregation, a method was developed that is powerful, and easily interpreted. It relates the proportion of habitat occupied to...
Resource Type:: Dissertation
Full Text:: , Len Coop, Charles King, Peter McEvoy) for their guidance and perseverance. Several people read and

ScholarsArchive@OSU

Enhancing the predatory potential of hoverflies on aphids in Oregon broccoli fields with floral resources

Grazing, nutrients, and marine benthic algae : insights into the drivers and protection of diversity

Biodiversity : illustrations of some concepts, causes, and consequences

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

Diverse consumer guilds in intertidal communities of Oregon and the Republic of Panama and their effects on prey assemblages

Linking marine communities and ecosystems : invertebrates mediate nutrient availability in intertidal communities

Political economy and trade effects of invasive species regulation : the case of noxious weeds

Effects of intercropping beans with maize on angular leaf spot and rust of beans

Population genetics, ecology and evolution of a vertebrate metacommunity

Spatial patterns of predaceous and phytophagous apple mites (Acari : Eriophyidae, phytoseiidae, Stigmaeidae, Tetranychidae) : intra- and interspecific relationships

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