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Creator:: Suzuki, Yasuko
Abstract:: Caspian terns (Hydroprogne caspia) and double-crested cormorants (Phalacrocorax auritus) nest in large colonies on East Sand Island in the Columbia River estuary, the largest known colonies for the two species in the world. Both species of piscivorous colonial waterbirds have been identified as predators with a significant impact on the...
Resource Type:: Dissertation
Full Text:: colonies on East Sand Island in the Columbia River estuary, the largest known colonies for the two

Creator:: Lyons, Donald E.
Abstract:: This dissertation focuses on the predator-prey relationship between two species of avian predators, Caspian terns (Hydroprogne caspia) and double-crested cormorants (Phalacrocorax auritus), and one of their important prey types, juvenile salmonids (Oncorhynchus spp.), in the Columbia River estuary of Oregon and Washington states during the period 1998 – 2007. I...
Resource Type:: Dissertation
Full Text:: Columbia River Estuary. Abstract approved: Daniel D. Roby This dissertation focuses on the

Creator:: Lara-Lara, Ruben
Resource Type:: Dissertation
Full Text:: ). The Lower Columbia River is a coastal plain estuary, or drowned river valley, formed as the sea level

Creator:: Martin, John Varick
Abstract:: A two phase investigation was undertaken in an attempt to determine the effects of variations in salinity on the distribution of benthic estuarine diatoms. The estuary studied was that of the Yaquina River which originates in the Coast Range of western Oregon and discharges into the Pacific Ocean at the...
Resource Type:: Dissertation
Full Text:: the water temperature of the estuary by cooling it when river water is warmer and warming it when

Creator:: Haertel, Lois Steben
Abstract:: Monthly samples of nutrients, phytoplankton and zooplankton were taken in the Columbia River estuary over a period of 16 months in order to determine distribution with season and salinity, and interrelationships between plankton and nutrients. Nitrate and phosphate levels in the river water entering the estuary are high in the...
Resource Type:: Dissertation
Full Text:: : PLANKTON AND NUTRIENT ECOLOGY OF THE COLUMBIA RIVER ESTUARY Abstract approved: Charles Osterberg Monthly

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