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Articles 151 - 156 of 156
Full-Text Articles in Physical Sciences and Mathematics
Effects Of Salmon-Derived Nutrients On An Artificial Stream System, Danielle M. Love
Effects Of Salmon-Derived Nutrients On An Artificial Stream System, Danielle M. Love
WWU Graduate School Collection
An artificial stream system was constructed to study responses of autotrophic and heterotrophic stream communities to salmon-derived nutrients. The artificial stream system contained 12 raceways (1.2 m long x 20 cm wide x 13 cm tall) that were provided with a constant flow of well water. The experimental treatment group consisted of clay pots filled with pureed salmon carcasses and agar to simulate decomposing salmon carcasses; a control group was included consisting of pots containing agar without salmon tissue. Unglazed clay tiles were placed downstream from the clay pots for periphyton to colonize. Periphyton samples were collected from these tiles. …
A Spatially Explicit Relative Elevation Model For Padilla Bay, Washington, Peter Kairis
A Spatially Explicit Relative Elevation Model For Padilla Bay, Washington, Peter Kairis
WWU Graduate School Collection
The dynamics that govern the elevation of a coastal wetland relative to sea level are complex, involving non-linear feedbacks among opposing processes. Changes in the balance between these processes can result in significant alterations to vegetation communities that are adapted to a specific range of water levels. Given that the accretion rate in Padilla Bay, Washington, is suspected to be considerably lower than historical levels and that eustatic sea level rise continues to accelerate, the long term sustainability of the Zostera marina (eelgrass) meadows in the bay may be at risk to eventual submergence. I extended an existing Relative Elevation …
Habitat Relationships And Gene Flow Of Martes Americana In Northern Idaho, Tzeidle N. (Tzeidle Nichole) Wasserman
Habitat Relationships And Gene Flow Of Martes Americana In Northern Idaho, Tzeidle N. (Tzeidle Nichole) Wasserman
WWU Graduate School Collection
Forest fragmentation can have a dramatic effect on landscape connectivity and dispersal of animals, potentially reducing gene flow within and among populations. American marten populations (Martes americana) are sensitive to forest fragmentation and the spatial configuration of patches of remnant mature forest has an important impact on habitat quality. This study represents an extensive multiple scale habitat relationships analysis conducted for American marten. In conjunction with Idaho Department of Fish and Game (IDFG) and the U.S. Forest Service, genetic data on marten populations across the Idaho Panhandle National Forest was used to build habitat relationships models. Over 3 years of …
Shelter Competition Between Native Signal Crayfish And Non-Native Red Swamp Crayfish In Pine Lake, Sammamish, Washington: The Role Of Size And Sex, Karl W. Mueller
Shelter Competition Between Native Signal Crayfish And Non-Native Red Swamp Crayfish In Pine Lake, Sammamish, Washington: The Role Of Size And Sex, Karl W. Mueller
WWU Graduate School Collection
Freshwater crayfish (Decapoda) communities worldwide are becoming increasingly similar from location to location by the intentional or accidental introduction of North American crayfishes. The red swamp crayfish (Procambarus clarkii, Cambaridae), which is native to the south-central United States and northeastern Mexico, is the most widely introduced crayfish in the world. It was first discovered in Pine Lake, Sammamish, Washington in 2000. The results of a 2005 baseline survey of the crayfish in Pine Lake suggested that the red swamp crayfish was displacing the native signal crayfish (Pacifastacus leniusculus, Astacidae). One mechanism through which non-native crayfishes displace native species is competitive …
Dairy Farming And The Effects Of Agricultural, Nonpoint-Source Pollution On Stream Water Quality, Johnson Creek Watershed, Whatcom County, Washington, Max Thomas Wills
Dairy Farming And The Effects Of Agricultural, Nonpoint-Source Pollution On Stream Water Quality, Johnson Creek Watershed, Whatcom County, Washington, Max Thomas Wills
WWU Graduate School Collection
The Johnson Creek watershed, which supports one of the highest densities of dairy farms in Washington State, suffers from degraded stream water quality, primarily in the form of high fecal coliform concentrations, elevated nutrients, and low levels of dissolved oxygen. Despite the implementation of best management practices (BMPs) over the past two decades, poor stream water quality has persisted. The Washington State Department of Ecology (DOE) is therefore required under section 303(d) of the federal Clean Water Act, to establish a Total Maximum Daily Load (TMDL) policy for the basin as a means of remediating the impaired water bodies. The …
Phellinus Weirii Root Rot Of Douglas Fir In The Sehome Hill Arboretum: Distribution, Impact And Management Options, William G. (William Gary) Cantrell
Phellinus Weirii Root Rot Of Douglas Fir In The Sehome Hill Arboretum: Distribution, Impact And Management Options, William G. (William Gary) Cantrell
WWU Graduate School Collection
This study examines the cause, distribution and impact of a forest pathogen within the 71 forested hectares of the Sehome Hill Arboretum in urban Bellingham, Washington. The causal agent was determined by the identification of cultures from decaying wood in douglas fir (Pseudotsuga menziesii (Mirbel) Franco) to be the root rotting basidiomycete Phellinus weirii (Muir.) Gilb. A ground survey of aboveground symptoms was used to detect 31 infection centers covering 6.64 hectares (9.2% of the Arboretum) of symptomatic trees. Infra-red aerial photography was used to determine canopy cover for deciduous and evergreen species. A forest canopy survey was …