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Full-Text Articles in Physical Sciences and Mathematics
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. …