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Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Impact Of Riverbank Lupine (Lupinus Rivularis) On Grand Fir (Abies Grandis) Ectomycorrhizal Symbioses, Andrew Labay
Impact Of Riverbank Lupine (Lupinus Rivularis) On Grand Fir (Abies Grandis) Ectomycorrhizal Symbioses, Andrew Labay
WWU Graduate School Collection
Lupine (Lupinus rivularis) is used in the revegetation of coarse sediments surrounding the Elwha basin in Washington State due to its ability to improve soil conditions. Previous research illustrated that seeding lupine with conifers increased growth and foliar nitrogen, however, decreased ectomycorrhizal (ECM) root colonization, an important symbiosis for conifers used in restoration. We hypothesized the observed decrease in ECM may be due to lupine increasing soil nitrogen, negating the need for a fungal symbiont. To investigate this, we explored the interaction between lupine and ECM colonization of grand fir (Abies grandis) in both a field …
A Characterization Of Hyporheic Temperatures With Applications For Salmon Habitat Restoration In A Thermally Impaired River, Sydney Jantsch
A Characterization Of Hyporheic Temperatures With Applications For Salmon Habitat Restoration In A Thermally Impaired River, Sydney Jantsch
WWU Graduate School Collection
This thesis project is part of an ongoing study assessing the effectiveness of a potentially innovative habitat restoration strategy for Pacific salmon in thermally impaired rivers. This strategy uses engineered log jams (ELJs) to create pockets of cool-water refuge by forming deep scour pools and promoting localized upwellings of shallow subsurface (i.e., hyporheic) water. This project seeks to characterize the relationship between hyporheic temperature and overlying surface stream temperature to elucidate the extent to which hyporheic upwellings can deliver cool water to ELJ-formed pools during the summer low-flow season. Among six sites within a 2.7 km-long study reach on the …
The Effect Of Large Woody Debris, Direct Seeding, And Distance From The Forest Edge On Species Composition On Novel Terraces Following Dam Removal On The Elwha River, Wa., Sara J. Cendejas-Zarelli
The Effect Of Large Woody Debris, Direct Seeding, And Distance From The Forest Edge On Species Composition On Novel Terraces Following Dam Removal On The Elwha River, Wa., Sara J. Cendejas-Zarelli
WWU Graduate School Collection
The removal of two dams on the Elwha River, Washington, exposed over 300 hectares of reservoir sediments and created primary successional habitats that posed challenges to revegetation efforts. In order to meet Elwha restoration goals, coarse sediment deposits would require revegetation methods aimed at quickly restoring native vegetation while deterring exotic species invasions. I examined the effect of two restoration treatments—large woody debris translocations and native seed enhancements—on plant species composition on novel terraces in the former Lake Mills reservoir four years after dam removal. I sampled vegetation in seeded and unseeded treatment areas with and without large woody debris. …
The Effectiveness Of Large Woody Debris Placement At Improving Freshwater Rearing Habitat And Enhancing Juvenile Salmon (Oncorhynchus Spp.) Production, Caroline J. Walls
The Effectiveness Of Large Woody Debris Placement At Improving Freshwater Rearing Habitat And Enhancing Juvenile Salmon (Oncorhynchus Spp.) Production, Caroline J. Walls
WWU Graduate School Collection
The decline of Pacific salmon (Oncorhynchus spp.) is well-documented, and freshwater habitat degradation is a primary contributor. Despite decades of river restoration, salmon populations have not significantly recovered. Large woody debris (LWD) placement is one of the most common forms of restoration. To evaluate the effectiveness of this restoration method, I analyzed long-term monitoring data from 16 LWD placement projects throughout Washington State, implemented between 2004 and 2015. Each project followed a multiple Before-After, Control-Impact study design, which monitored physical habitat and fish populations. I used a series of linear mixed models to evaluate both habitat and fish response. …
Daytime Summer Microclimate Influence Of Large Woody Debris On Dewatered Sediments In Lake Mills, Wa Following Dam Removal, Mariah J. Colton
Daytime Summer Microclimate Influence Of Large Woody Debris On Dewatered Sediments In Lake Mills, Wa Following Dam Removal, Mariah J. Colton
WWU Graduate School Collection
In 2014, dam removal from the Elwha River, Washington state, exposed large areas of previously submerged sediment. The Olympic National Park placed ~100 large logs on 2 ha of exposed sediment to promote plant establishment. I quantified patterns of three microclimate variables near logs: wind speed at 10-cm height (u10), sediment temperature (TS), and evaporation rate (E); and their relationships to broader environmental factors. The northern-most log, exposed to northerly winds, was measured along 3-m perpendicular transects 14 times during August and September 2015. I determined nonlinear and multilevel regressions to investigate …