Index Catalog // ScholarsArchive@OSU

The influence of biophysical feedbacks and species interactions on grass invasions and coastal dune morphology in the Pacific Northwest, USA

Creator:: Zarnetske, Phoebe Lehmann
Abstract:: Biological invasions provide a unique opportunity to study the mechanisms that regulate community composition and ecosystem function. Invasive species that are also ecosystem engineers can substantially alter physical features in an environment, and this can lead to cascading effects on the biological community. Aquatic-terrestrial interface ecosystems are excellent systems to...
Resource Type:: Dissertation
Full Text:: ABSTRACT OF THE DISSERTATION OF Phoebe Lehmann Zarnetske for the degree of Doctor of Philosophy in

Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface

Creator:: Zarnetske, Jay P.
Abstract:: The feedbacks between hydrology and biogeochemical cycling of nitrogen (N) are of critical importance to global bioavailable N budgets. Human activities are dramatically increasing the amount of bioavailable N in the biosphere, which is causing increasingly frequent and severe impacts on ecosystems and human welfare. Streams are important features in...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Jay P. Zarnetske for

Biophysical feedback mediates effects of invasive grasses on coastal dune shape

Creator:: Zarnetske, Phoebe L., Hacker, Sally D., Seabloom, Eric W., Ruggiero, Peter, Killian, Jason R., Maddux, Timothy B., and Cox, Daniel
Abstract:: Vegetation at the aquatic–terrestrial interface can alter landscape features through its growth and interactions with sediment and fluids. Even similar species may impart different effects due to variation in their interactions and feedbacks with the environment. Consequently, replacement of one engineering species by another can cause significant change in the...
Resource Type:: Article
Full Text:: coastal dune shape PHOEBE L. ZARNETSKE,1,6 SALLY D. HACKER,1 ERIC W. SEABLOOM,2 PETER RUGGIERO,3 JASON R

Invasive Congeners Differ in Successional Impacts across Space and Time

Creator:: David, Aaron S., Zarnetske, Phoebe L., Hacker, Sally D., Ruggiero, Peter, Biel, Reuben G., and Seabloom, Eric W.
Abstract:: Invasive species can alter the succession of ecological communities because they are often adapted to the disturbed conditions that initiate succession. The extent to which this occurs may depend on how widely they are distributed across environmental gradients and how long they persist over the course of succession. We focus...
Resource Type:: Article
Full Text:: , A. S., Zarnetske, P. L., Hacker, S. D., Ruggiero, P., Biel, R. G., & Seabloom, E. W. (2015

The Role of Vegetation in Determining Dune Morphology, Exposure to Sea-Level Rise, and Storm-Induced Coastal Hazards : A U.S. Pacific Northwest Perspective

Creator:: Ruggiero, Peter, Hacker, Sally, Seabloom, Eric, and Zarnetske, Phoebe
Abstract:: This chapter is part of Barrier Dynamics and Response to Changing Climate. Coastal foredunes are often the “first line of defense” for backshore infrastructure from the hazards of erosion and flooding, and they are key components of coastal ecosystems. The shape and growth characteristics of coastal foredunes, typically characterized by...
Resource Type:: Part of Book

Dynamics of nitrate production and removal as a function of residence time in the hyporheic zone

Creator:: Zarnetske, Jay P., Haggerty, Roy, Wondzell, Steven M., and Baker, Michelle A.
Abstract:: Biogeochemical reactions associated with stream nitrogen cycling, such as nitrification and denitrification, can be strongly controlled by water and solute residence times in the hyporheic zone (HZ). We used a whole‐stream steady state ¹⁵N‐labeled nitrate (¹⁵NO₃⁻) and conservative tracer (Cl⁻) addition to investigate the spatial and temporal physiochemical conditions controlling...
Resource Type:: Article
Full Text:: . Zarnetske, A. Argerich, and B. Burkholder for field/lab assistance; L. Ashkenas and S. Thomas for advising

Labile dissolved organic carbon supply limits hyporheic denitrification

Creator:: Zarnetske, Jay P., Haggerty, Roy, Wondzell, Steven M., and Baker, Michelle A.
Abstract:: We used an in situ steady state ¹⁵N-labeled nitrate (¹⁵NO₃⁻) and acetate (AcO⁻) well-to-wells injection experiment to determine how the availability of labile dissolved organic carbon (DOC) as AcO⁻ influences microbial denitrification in the hyporheic zone of an upland (third-order) agricultural stream. The experimental wells receiving conservative (Cl⁻ and Br)...
Resource Type:: Article
Full Text:: . Zarnetske,1,2 Roy Haggerty,3 Steven M. Wondzell,4 and Michelle A. Baker5 Received 4 April 2011; revised 11

Coupling multiscale observations to evaluate hyporheic nitrate removal at the reach scale

Creator:: Zarnetske, Jay P., Haggerty, Roy, and Wondzell, Steven M.
Abstract:: Excess NO₃⁻ in streams is a growing and persistent problem for both inland and coastal ecosystems, and denitrification is the primary removal process for NO₃⁻. Hyporheic zones can have high denitrification potentials, but their role in reach- and network-scale NO₃⁻ removal is unknown because it is difficult to estimate. We...
Resource Type:: Article
Full Text:: removal at the reach scale Zarnetske, J. P., Haggerty, R., & Wondzell, S. M. (2015). Coupling multiscale

Quantification of metabolically active transient storage (MATS) in two reaches with contrasting transient storage and ecosystem respiration

Creator:: Argerich, Alba, Haggerty, Roy, Marti, Eugenia, Sabater, Francesc, and Zarnetske, Jay
Abstract:: Water transient storage zones are hotspots for metabolic activity in streams although the contribution of different types of transient storage zones to the whole-reach metabolic activity is difficult to quantify. In this study we present a method to measure the fraction of the transient storage that is metabolically active (MATS)...
Resource Type:: Article
Full Text:: smaller scale. Citation: Argerich, A., R. Haggerty, E. Martí, F. Sabater, and J. Zarnetske (2011

Coupled transport and reaction kinetics control the nitrate source-sink function of hyporheic zones

Creator:: Zarnetske, Jay P., Haggerty, Roy, Wondzell, Steven M., Bokil, Vrushali A., and Gonzalez-Pinzon, Ricardo
Abstract:: The fate of biologically available nitrogen (N) and carbon (C) in stream ecosystems is controlled by the coupling of physical transport and biogeochemical reaction kinetics. However, determining the relative role of physical and biogeochemical controls at different temporal and spatial scales is difficult. The hyporheic zone (HZ), where groundwater–stream water...
Resource Type:: Article
Full Text:: L�1 [Zarnetske et al., 2011a]) were con- ducted for the two most sensitive hyporheic parameters

ScholarsArchive@OSU

The influence of biophysical feedbacks and species interactions on grass invasions and coastal dune morphology in the Pacific Northwest, USA

Hydrological and biogeochemical dynamics of nitrate production and removal at the stream – ground water interface

Biophysical feedback mediates effects of invasive grasses on coastal dune shape

Invasive Congeners Differ in Successional Impacts across Space and Time

The Role of Vegetation in Determining Dune Morphology, Exposure to Sea-Level Rise, and Storm-Induced Coastal Hazards : A U.S. Pacific Northwest Perspective

Dynamics of nitrate production and removal as a function of residence time in the hyporheic zone

Labile dissolved organic carbon supply limits hyporheic denitrification

Coupling multiscale observations to evaluate hyporheic nitrate removal at the reach scale

Quantification of metabolically active transient storage (MATS) in two reaches with contrasting transient storage and ecosystem respiration

Coupled transport and reaction kinetics control the nitrate source-sink function of hyporheic zones

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