Index Catalog // ScholarsArchive@OSU

Heterogeneous thermal habitat for northeast Oregon stream fishes

Creator:: Ebersole, Joseph L.
Abstract:: Discrete coldwater patches within warm streams provide potential thermal refuge for coldwater fishes during periods of heat stress. This analysis focused on heterogeneity in stream water temperatures as influenced by local influx of cooler subsurface waters. Using field thermal probes and recording thermistors, we identified and characterized coldwater patches potentially...
Resource Type:: Dissertation
Full Text:: Thermal Habitat for Northeast Oregon Stream Fishes. Abstract approved: William J. Liss Discrete

Description and prediction of broad-scale spatial variability in expression of anadromy in female Oncorhynchus mykiss in the John Day River, Oregon, USA

Creator:: Mills, Justin S.
Abstract:: Partial migration is a common migratory behavior where some individuals in a population migrate and others do not. Patterns of partial migration can vary dramatically, especially for species that inhabit a wide range of environments. I described and predicted spatial variation in marine migration (anadromy) of female Oncorhynchus mykiss (steelhead...
Resource Type:: Masters Thesis
Full Text:: Female Oncorhynchus mykiss in the John Day River, Oregon, USA Abstract approved

A spatially explicit model for allocating conservation efforts : the Grand Ronde River basin, Oregon

Creator:: Watanabe, Michio
Abstract:: The spatial and dynamic pattern of landscape changes has a profound effect on the supply of environmental services, including the provision of habitat for fish and wildlife. Spatial heterogeneity is a common feature of landscapes in the Pacific Northwest, most notably in areas important to the production of salmonid fish...
Resource Type:: Masters Thesis
Full Text:: Oregon on agricultural land that provide habitat for endangered salmon and trout. Eligible land must

Seasonal floodplain wetlands as fish habitat in Oregon and Washington

Creator:: Baker, Cynthia F.
Abstract:: To begin to understand freshwater seasonal floodplain fish communities in the context of human alteration of the physical system, species introductions and wetland restoration efforts, I studied fish assemblages in fifteen seasonal floodplain wetlands within four geographic regions (coastal, upper Columbia River estuary, Puget Sound and eastern Oregon/Washington) in the...
Resource Type:: Dissertation
Full Text:: Science presented on March 17, 2008. Title: Seasonal Floodplain Wetlands as Fish Habitat in Oregon

Fishing induced environmental change and the value of biodiversity in a multi-species fishery

Creator:: Akpalu, Wisdom
Abstract:: It is well known that fishing activities may affect the structure of aquatic habitats and consequently determine the diversity, composition and productivity of the associated biota. The direct effect of fishing activities is on the habitat structure and the indirect effects occur when the fishing activity initiates shifts in the...
Resource Type:: Other
Full Text:: of fishing activities is on the habitat structure and the indirect effects occur when the fishing

Fishing in a Shallow Lake: A Case for Effort Controls?

Creator:: Janmaat, John and Ruijs, Arjan
Abstract:: In many situation, fishing activity adversely impacts the state of the marine ecosystem, impacts which feed back to affect fish stocks. Some ecosystems appear to have multiple equilibria and exhibit hysteresis, whereby they can become stuck in low productivity states. We show how adding ecosystem dynamics to a classic fisheries...
Resource Type:: Research Paper
Full Text:: optimalto move the system ba k to a healthy environment.Keywords: Fisheries e onomi s, habitat damage

Environmental variables as predictors of fish assemblages in the Tillamook Basin, Oregon

Creator:: Rose, Cathleen E.
Abstract:: The Tillamook and Kilchis subbasins of the Tillamook Bay watershed (Oregon Coast Range) have differences in geology and land use history and, therefore, varied environmental conditions that could affect fish assemblages. Fifty-two randomly selected wadeable stream reaches in these two subbasins were surveyed for stream habitat and fish assemblage composition...
Resource Type:: Masters Thesis
Full Text:: : Environmental Variables as Predictors of Fish Assemblages in the Tillamook Basin, Oregon. M. Jesse Ford The

Relationships among in-stream physical habitat, land use, and geology in small coastal streams of northern Oregon

Creator:: Scott, Larissa E.
Abstract:: Salmonid populations in the Pacific Northwest are at historic lows and many populations continue to decline. Previous studies have linked salmonid declines to land use through degradation of in-stream physical habitat, but few of these studies have taken geology into consideration. This study relates habitat parameters known to be important...
Resource Type:: Masters Thesis
Full Text:: PHYSICAL HABITAT, LAND USE AND GEOLOGY IN SMALL COASTAL STREAMS OF NORTHERN OREGON INTRODUCTION Stream

A geographical framework for assessing longitudinal patterns in stream habitat and fish distribution

Creator:: Torgersen, Christian E.
Abstract:: New approaches are needed to quantify and understand spatial patterns of stream fishes and their environment. Concepts in riverine ecology emphasize the importance of thermal zones and gradual longitudinal changes in physical habitat and biota, but little is known about spatial variability within the river continuum. I present a conceptual...
Resource Type:: Dissertation
Full Text:: : A Geographical Framework for Assessing Longitudinal Patterns in Stream Habitat and Fish

Testing the ArcGIS Marine Data Model : busing spatial information to examine habitat utilization patterns of reef fish along the west coast of Hawaii

Creator:: Aaby, Alyssa Anne
Abstract:: In response to anthropogenic pressures that have degraded habitat and put marine resources at risk (Leslie et al., 2003; Mumby et al., 2001; Puniwai et al., 2003), there has been a growing interest in the use of marine protected areas (MPAs) as a management tool to help slow, prevent or...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Heterogeneous thermal habitat for northeast Oregon stream fishes

Description and prediction of broad-scale spatial variability in expression of anadromy in female Oncorhynchus mykiss in the John Day River, Oregon, USA

A spatially explicit model for allocating conservation efforts : the Grand Ronde River basin, Oregon

Seasonal floodplain wetlands as fish habitat in Oregon and Washington

Fishing induced environmental change and the value of biodiversity in a multi-species fishery

Fishing in a Shallow Lake: A Case for Effort Controls?

Environmental variables as predictors of fish assemblages in the Tillamook Basin, Oregon

Relationships among in-stream physical habitat, land use, and geology in small coastal streams of northern Oregon

A geographical framework for assessing longitudinal patterns in stream habitat and fish distribution

Testing the ArcGIS Marine Data Model : busing spatial information to examine habitat utilization patterns of reef fish along the west coast of Hawaii

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