Index Catalog // ScholarsArchive@OSU

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:: thesis of Karina J. Nielsen presented on August 27, 1998 APPROVED: Co-Major Pro ssor, representing

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:: included Dr. Karina Nielsen, my minor professors- Dr. Ricardo Letelier (Oceanography) and Dr. Lisa Madsen

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

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:: Karina Nielsen gave me that shoulder to cry upon when I really needed it. A huge thanks to Cindy Kent

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:: summers of fieldwork, Gary Allison, Jennifer Burnaford, and Karina Nielsen provided ideas, support, and

Linkages between mangrove forests and coral reefs : quantifying disturbance effects and energy flow between systems

Creator:: Granek, Elise F.
Abstract:: Interface habitats are considered valuable natural systems, tightly linked to adjacent habitats through the flow of matter and energy. However, there is limited research on mechanisms of connectivity such as movement of organisms and particulate matter and ways in which anthropogenic disturbance to interface habitats may affect immediate and adjacent...
Resource Type:: Dissertation
Full Text:: graduate school years. Karina Nielsen provided me with advice, guidance and support during my first 3

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:: particular Gary Allison, Carol Blanchette, Dave Booth, Mark Carr, Jeff Harding, Dwayne Meadows, Karina

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:: , Karina Nielsen, Annette Olson, Deirdre Roberts, Eric Sanford, Cynthia Trowbridge, Peter van Tame len

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:: influenced my life in innumerable ways. Sergio Navarrete, Eric Berlow, Carol Blanchette, Karina Nielsen

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:: -productivity gradients: what does competition theory predict? Ecology 76:2019-2027. Brown, J. H. 1973

ScholarsArchive@OSU

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

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

Effects of environmental stress on intertidal mussel reproduction

Ecological subsidies to rocky shore communities : setting the stage for community dynamics in the Northeast Pacific

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

Linkages between mangrove forests and coral reefs : quantifying disturbance effects and energy flow between systems

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

The effects of biomechanical and ecological factors on population and community structure of wave-exposed, intertidal macroalgae

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

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

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