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  1. Influence of light on algal growth in the lower Willamette River

    During the summer of 1974 chemical conditions in the lower reaches of the Willamette River, Oregon were similar to those in other rivers currently experiencing nuisance algal growth problems. Temperature and...

  2. A Survey of Small Mammals on Islands in the Columbia and Willamette Rivers

    A survey of small mammals on eight islands in the Columbia and Willamette Rivers near Portland, Oregon was conducted in 1974. The islands were Govermnent , Sand, Lemon, McGuire and Sandy Islands in the Columbia...

  3. Breeding success and nest site characteristics of the western bluebird on Parrett Mountain

    The lack of suitable nest sites may be a limiting factor for Western Bluebird populations inhabiting the upper Willamette Valley. Nest box trails have been established on the hills surrounding the Portland...

  4. Rare, Threatened and Endangered Species of Oregon

    Extinction is a natural process. Today, however, plant and animal species are disappearing world-wide at an accelerated pace. Based on current trends, half of the species on earth will be extinct within the...

  5. Rare, Threatened and Endangered Species of Oregon

    Extinction is a natural process. Today, however, plant and animal species are disappearing world-wide at an accelerated pace. Based on current trends, half of the species on earth will be extinct within the...

  6. Rare, Threatened and Endangered Plants and Animals of Oregon

    Extinction is a natural process. Today, however, plant and animal species are disappearing world-wide at an accelerated pace. Based on current trends, half of the species on earth will be extinct within the...

  7. Rare, Threatened and Endangered Species of Oregon

    Extinction is a natural process. Today, however, plant and animal species are disappearing world-wide at an accelerated pace. Based on current trends, half of the species on earth will be extinct within the...