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Conclusions:Within a watershed, about 10% of development is not subject to drainage regulations resulting in cumulative effects from urbanization that significantly degrade watersheds. Instead of regulatory thresholds (e.g. 10% EIA), process controls are required to mitigate the impacts of urbanization on aquatic systems. Without these controls, strict development limits are the only way to limit watershed degradation.Thresholds/Learnings:The study cautions against the use of discrete “thresholds” to predict specific physical and biological effects, but does suggest that thresholds are appropriate indicators for when the perception and tolerance of watershed impacts triggers a regulatory response.
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Synopsis: Classical demographic methods applied to life history data on the northern spotted owl yield an estimate of the annual geometric rate of increase for the population of λ = 0.96 ± 0.03, which is not significantly different from that for a stable population (λ = 1.00). Sensitivity analysis indicates that adult annual survivorship has by far the largest influence on λ, followed by the probability that juveniles survive dispersal, and the adult annual fecundity. Substantial temporal fluctuations in demographic parameters have little effect on the long-run growth rate of the population because of the long adult life expectancy. A model of dispersal and territory occupancy that assumes demographic equilibrium...
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The Jamestown SKlallam and Port Gamble SKlallam tribes, and many other tribes in the PacificNorthwest, rely on ESA listed fish species for subsistence as well as cultural and economic practices.Concern has grown over the impacts climate change might have throughout the 21st Century ontraditional fishing areas. We will employ well validated hydrological numerical modeling methodologiesto project streamflow changes in five major fish-bearing streams and their tributaries in the NorthwestOlympic Peninsula in Washington State. Results from this study will be made available to tribal leadersand natural resource managers for planning purposes and to assess potential freshwater habitatvulnerability under a variety of plausible...
    map background search result map search result map Demographic models of the northern spotted owl (Strix occidentalis caurina) Modeling the Effects of Climate Change on Fish-bearing Streams in Western Washington Modeling the Effects of Climate Change on Fish-bearing Streams in Western Washington Demographic models of the northern spotted owl (Strix occidentalis caurina)