Mission Statement: We are a network of professional and amateur scientists from diverse disciplines that provides support and a forum for research and education relevant to the environment and resource management of northwestern North America. To accomplish our mission, the association publishes a quarterly journal, convenes an annual scientific meeting, and awards student research grants.

Since 1923, the NWSA has existed for the purpose of promoting scientific research and disseminating scientific knowledge. Our annual meetings are held throughout the Pacific Northwest and provide an opportunity to share recent findings and foster collaborative interactions.

NWSA publishes four issues of Northwest Science each year. A peer reviewed journal, Northwest Science is an outlet for original papers on wide ranging topics in the natural sciences, including anthropology, aquatic biology, botany, ecology, fisheries, forestry, geology, geography, hydrology, soils, wildlife biology, and zoology. The geographic scope of Northwest Science is the northwestern United States and western Canada.


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Northwest Science 94(2)
Table of Contents


Editorial Transition


Estimates of Chinook Salmon Spawning Habitat in a Blocked Reach of the Columbia River Upstream of Grand Coulee DamBrian J. Bellgraph,Casey Baldwin, Lysel Garavelli, Zannatul Haque, William Perkins, Marshall Richmond, Matt Howell, and Jason McLellan

Anadromous Coastal Cutthroat Trout (Oncorhynchus clarkii clarkii) as a Host for Argulus pugettensis (Crustacea, Branchiura): Parasite Prevalence, Intensity and DistributionJames P. Losee, Simon R. M. Jones, Caitlin A. E. McKinstry, William N. Batts, and Paul K. Hershberger

Monitoring the Return of Marine Derived Nitrogen to Riparian Areas in Response to Dam Removal on the Elwha River, WashingtonWendal Kane, Rebecca Brown, and Justin Bastow

Whitebark pine in the National Parks of the Pacific States: An Assessment of Population Vulnerability – Erik S. Jules, Phillip J. van Mantgem, Benjamin G. Iberle, Jonathan C.B. Nesmith, and Regina M. Rochefort

Ecoregion—Rather Than Sympatric Legumes—Influences Symbiotic Bradyrhizobium Associations in Invasive Scotch Broom (Cytisus scoparius) in the Pacific Northwest Robyn Dove, Emily R. Wolfe, Nathan U. Stewart, and Daniel J. Ballhorn

Changes in Vegetation Cover of Yukon River Drainages in Interior Alaska: Estimated from MODIS Greenness Trends, 2000 to 2018 Christopher Potter 

Bigleaf Maple Within-Crown Leaf Morphology and Seasonal Physiology – Lucy P. Kerhoulas, David T. Hammons, and Nicholas J. Kerhoulas

Military Flights Threaten the Wilderness Soundscapes of the Olympic Peninsula, Washington – Lauren M. Kuehne and Julian D. Olden

Book Review

The Mountain is Out: Book Review of Tahoma and its People: A Natural History of Mount Rainier National ParkKevin Ford

Changing Climate, Changing Soils: Book Review of Global Change and Forest Soils: Cultivating Stewardship of a Finite Natural ResourceBrittany Johnson

Butterflies Add to the Color of Spring: Book Review of Butterflies of the Pacific NorthwestSusan Waters


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