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- Algae -- Ecology (1)
- Barnacles -- Ecology (1)
- Biogeochemistry -- Oregon -- Harney Lake (1)
- Freshwater zooplankton -- Oregon -- Geographical distribution (1)
- Geochemistry -- Oregon -- Harney Lake (1)
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- Hot spring ecology -- Oregon -- Harney Lake (1)
- Intertidal ecology (1)
- Lampreys -- Larvae -- Dispersal -- Washington (State) -- Ellsworth Creek (1)
- Lampreys -- Larvae -- Effect of salt on -- Washington (State) -- Ellsworth Creek (1)
- Lampreys -- Larvae -- Effect of stress on -- Washington (State) -- Ellsworth Creek (1)
- Nature -- Effect of human beings on (1)
- Osmoregulation (1)
- Peromyscus maniculatus (1)
Articles 1 - 5 of 5
Full-Text Articles in Biology
Investigations Of Larval Pacific Lamprey Entosphenus Tridentatus Osmotic Stress Tolerance And Occurrence In A Tidally-Influenced Estuarine Stream, Gregory Shell Silver
Investigations Of Larval Pacific Lamprey Entosphenus Tridentatus Osmotic Stress Tolerance And Occurrence In A Tidally-Influenced Estuarine Stream, Gregory Shell Silver
Dissertations and Theses
Pacific lamprey is a culturally valuable species to indigenous people, and has significant ecological importance in freshwater and marine ecosystems. Over the past several decades, constrictions in range and reductions in Pacific lamprey abundance have been observed in Western North America, and may be indicators of range-wide declines. In the face of declining populations, the U.S. Fish and Wildlife Service has partnered with tribal, state, federal, and local entities to implement a regional Pacific lamprey conservation agreement aimed at reducing threats to Pacific lamprey and improving their habitats and population status. Research needs identified in the conservation agreement include assessing …
Human Trampling In The Upper Rocky Intertidal: Trampling And Recovery In Barnacle Mediated Succession, Timothy Lawrence Grubba
Human Trampling In The Upper Rocky Intertidal: Trampling And Recovery In Barnacle Mediated Succession, Timothy Lawrence Grubba
Dissertations and Theses
Marine intertidal ecosystems are vulnerable to human interference,
because trampling can be a significant problem. I studied the impacts of
trampling on community patterns and succession in a rocky intertidal
habitats. This study was divided into two phases: ( 1) a trampling phase and
(2) a recovery phase. Both phases are focused on two barnacles, Balanus
glandula and Chthamalus dalli, and on fucoid and red algae. The trampling
phase tested the effects of trampling on these organisms. The effects of
herbivores, primarily limpets (Collisella digitalis) were also tested to
determine whether anthropogenic (trampling) and natural (herbivory and
limpet bulldozing) disturbances …
The Distribution Of Zooplankton In Selected Oregon Lakes, Mary Elizabeth Claska
The Distribution Of Zooplankton In Selected Oregon Lakes, Mary Elizabeth Claska
Dissertations and Theses
Zooplankton samples were collected from 166 Oregon lakes. The lakes included a wide range in size, trophic status, and water quality. Lakes were located throughout the state. Zooplankton were identified using standard taxonomic keys and counted. Seventy-four species were identified from the 200 total samples, including 32 species of cladocera, 22 copepods, and 11 rotifers. Two species of copepod were recorded for the first time in Oregon: Diaptomus mississippiensis and Diaptomus pallidus. Seven species had widespread distributions throughout most of the watersheds in the state. Seventeen other species had distributions restricted to eastern, central, or western Oregon. The remaining …
Geochemical And Biogeochemical Interactions In A Hot Spring, William Delis Knox
Geochemical And Biogeochemical Interactions In A Hot Spring, William Delis Knox
Dissertations and Theses
Southeast Harney Lake Hot Spring and its effluent channel were examined for spatial and temporal variations in the concentrations of several chemical species, viz. dissolved oxygen, pH, alkalinity, phosphate-phosphorous, nitrate and nitrite-nitrogen, conductivity, chloride, flouride, temperature, calcium, magnesium, potassium, and sodium. Phosphate-phosphorous and nitrate-nitrogen both exhibited downstream increases in concentration. pH and alkalinity increased also, mainly due to CO2 evolution and temperature mediated carbon species redistribution. The diurnal pH and alkalinity curves exhibited depressions during the daylight hours due to the oxidation of ammonia to nitrate within the pool and effluent stream.
The Distribution Of The Deer Mouse, Peromyscus Maniculatus, On The Oregon Side Of The Columbia River Gorge, Ronald P. Neilson
The Distribution Of The Deer Mouse, Peromyscus Maniculatus, On The Oregon Side Of The Columbia River Gorge, Ronald P. Neilson
Dissertations and Theses
A study of the biogeography of Peromyscus maniculatus was undertaken in order to ascertain a few of the environmental parameters important in defining the distribution of this species and how the species in turn has adapted to these parameters. The Columbia Gorge was chosen as it presents a climatic gradient from maritime to continental with very little elevation gain. Changes along this gradient in topography, soils and vegetation community structure are discussed.