Now showing items 1-6 of 6
Host selection behavior of the Douglas-fir pitch moth, Synanthedon novaroensis (Hy. Edwards) (Lepidoptera:Sesiidae), related to intermediate silvicultural activities
The Douglas-fir pitch moth (DFPM), Synanthedon novaroensis, is attracted to exudations of oleoresin and oviposits at wounds on the bole of host trees. Larvae then feed in subcortical regions of vigourously growing hosts. With the increase use of pruning in young stands of Douglas-fir, Pseudotsuga menzesii (Mirb.) Franco, the ...
Modeling large-scale fire effects: concepts and applications
Climatic changes anticipated for the next century are expected to alter the effects of fire on large-scale vegetation patterns. It is unlikely that future interactions between fire and vegetation can be predicted from knowledge of current and historic patterns. Thus, there is a need for simulation models that will produce ...
Life history and multivariate analyses of habitat selection patterns among small cetaceans in the central North Pacific Ocean
Habitat selection and life history patterns were compared among three species of small cetaceans in the central North Pacific Ocean: Dall's porpoise (Phocoenoides dalli), northern right whale dolphin (Lissodelphis borealis) and Pacific white-sided dolphin (Lagenorhynchus obliquidens). Biological samples and fisheries data ...
Rates and pathways of recovery for sediment supply and woody debris recruitment in northwestern Washington streams, and implications for salmonid habitat restoration
This dissertation describes a strategy for restoring watershed processes. The restoration strategy is driven by the recognition that (1) salmonids are adapted to local environmental conditions, and (2) spatial and temporal variations in landscape processes create a dynamic mosaic of habitats in a river network. Therefore, the ...
Simulation of bidirectional reflectance, modulation transfer, and spatial interaction for the probabilistic classification of Northwest forest structures using Landsat data
Satellite remote sensors sample the upwelling reflected radiance in the form of digital images. A hierarchical model linking several sub-models of the image acquisition process and the spatial interaction of the classes has been developed to infer forest structure classes from these samples. Forest classifications exhibit ...
Wind stability of naturally regenerated and planted Douglas-fir stands in coastal Washington, Oregon, and British Columbia
Risk of wind damage is an important factor influencing forest management throughout the world. Managed forest landscapes of the coastal Pacific Northwest are undergoing a transition from dominance by naturally regenerated second-growth stands to Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantations. This analysis ...