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Effect of Hypo-osmotic Stress on Mortality and Regulation of Volume, Osmolality, and Magnesium Ion Concentrations in the Sea Anemone Metridium senile in South Slough, Coos Bay, OregonAustin, Heather L. (Heather Lara), 1984- 12 1900 (has links)
xv, 151 p. : ill. A print copy of this thesis is available through the UO Libraries. Search the library catalog for the location and call number. / The sea anemone Metridium senile occurs along a salinity gradient in the South
Slough Estuary, Oregon, where it is subjected to frequent and sometimes large
fluctuations in salinity. This study determined how hypo-osmotic stress contributes to the
survival and distribution of this population. In the laboratory, chronic exposure ofM.
senile to 50% and 75% seawater for twenty-eight days resulted in partial regulation of
volume and magnesium ions. Anemones transplanted to the field exhibited increased
mortality and partial regulation of volume, osmolality, and magnesium ions with
decreased salinity during the wet season (December-February) and less regulation during
the dry season (June-August). This pattern of physiological tolerance coincides with
observed trends of seasonal abundance and distribution. Previous studies describe M senile as a marine osmoconformer, however this estuarine population is able to
withstand moderate hypo-osmotic stress through partial regulation of tissue osmolality
and magnesium ions. / Committee in Charge:
Dr. Craig M. Young, Chair;
Dr. Nora B. Terwilliger;
Dr. Steven S. Rumrill;
Dr. Caren E. Braby
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Water Quality Model for South Slough, Coos Bay, OregonJuza, Holly Kay 05 May 1995 (has links)
The South Slough Estuary is located off Coos Bay along the southern coast of Oregon. It is divided into two channels that meet and continue to Coos Bay at the Charleston Harbor. There are six major contributing streams to South Slough. After rainfall events, the level of coliform bacteria in the slough increases because of stream bacteria loading. This is due to cattle grazing in the drainage areas, failed septic systems from private homes, and sewage sludge applied to the County landfill, which drains into the slough. The Oregon Health Division has enforced a Sanitation Management Plan for Commercial Shellfish Harvesting in South Slough that specifies closure of commercial shellfish harvesting for certain rainfall and flood events. The purpose of this study is to analyze and improve the current understanding of the hydraulics and water quality of the South Slough Estuary. This was achieved by calibrating the South Slough using the water quality model CEQUAL- W2. It was calibrated for the following parameters water surface elevations, velocity, temperature and total dissolved solids. A management analysis was also done analyzing the transport of bacteria and a conservative tracer. Model predictions for water surface elevations at one of the monitoring sites, Hinch Road Bridge, was significantly lower than measured elevations. There was an excellent correlation of velocity, and reasonable timing of peaks due to tidal effects. Model predictions for temperature and total dissolved solids match measured values well. To improve the accuracy of the model the following was recommended; install a raingage in the South Slough, measure temperature and constituent concentrations at inflow locations, survey the S4 current meter, new soundings performed of the Winchester Creek arm and at the Hinch Road Bridge gaging station, and investigate the possibility of an obstruction near the Hinch Road Bridge gaging station.
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The life history traits and population dynamics of the brooding bivalve, Transennella tantilla (Gould) in the South Slough of Coos Bay, OregonAsson-Batres, Mary Ann,1948- 09 1900 (has links)
ix, 73 leaves : ill. ; 28 cm
Typescript
Thesis (M.S.)--University of Oregon
Includes vita and abstract
Bibliography: leaves 71-73
Another copy on microfilm is located in Archives
University of Oregon theses, Dept. of Biology, M.S., 1982
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Recruitment of larvae of the ghost shrimp, Callianassa californiensis (Crustacea, Decapoda), in the South Slough Estuary, OregonPimentel, Gliceria Estandian January 1986 (has links)
x, 53 leaves : ill., map ; 29 cm
Notes Typescript
Thesis (M.S.)--University of Oregon, 1986
Includes vita and abstract
Bibliography: leaves 48-53
Another copy on microfilm is located in Archives
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Transport of zooplankton in South Slough, OregonPuls, Amy L. January 2002 (has links)
Typescript.
Includes vita and abstract.
Bibliography: Includes bibliographical references (leaves 90-96).
Description: xii, 96 leaves : ill. ; 29 cm.
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Microbial ecology of South Slough sediments : community composition of bacteria and patterns of occurrenceMilbrandt, Eric Charles January 2003 (has links)
Typescript.
Includes vita and abstract.
Bibliography: Includes bibliographical references (leaves 87-100).
Description: xiii, 100 leaves : ill. ; 29 cm.
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Spatial and temporal variation in the development of epiphytic diatom communities on the eelgrass, Zostera marina L.Mutchler, Troy R. January 1998 (has links)
Typescript.
Includes vita and abstract.
Bibliography: Includes bibliographical references (leaves 79-83).
Description: viii, 83 leaves : ill., map ; 29 cm.
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Microzooplankton trophic interactions and their impact on phytoplankton production and community structure in the South Slough arm of Coos Bay, OregonCowlishaw, Richard Joseph, 1965- January 2002 (has links)
xvii, 175 leaves : ill. ; 29 cm
Notes Typescript
Thesis (Ph. D.)--University of Oregon, 2002
Includes vita and abstract
Includes bibliographical references (leaves 150-175)
Another copy on microfilm is located in Archives
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The effects upon the macrofaunal community of a dominant burrowing deposit feeder, C̲a̲ḻḻi̲a̲ṉa̲s̲s̲a̲ c̦a̲ḻi̲f̲o̲ṟṉi̲e̲ṉs̲i̲s̲, and the role of predation in determining its intertidal distributionPosey, Martin Harold January 1985 (has links)
ix, 119 leaves : ill., maps ; 28 cm
Notes Typescript
Thesis (Ph. D.)--University of Oregon, 1985
Includes vita and abstract
Bibliography: leaves 108-119
Another copy on microfilm is located in Archives
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Analysis of the lower distributional limit of callianassid shrimp in South Slough National Estuarine Research ReserveMiner, Jonathan Neal, 1969- January 1993 (has links)
Typescript.
Includes vita and abstract.
Bibliography: Includes bibliographical references (leaves 77-80).
Description: xii, 80 leaves : ill. ; 29 cm. / The lower distributional limits (fronts) of
callianassid shrimp populations were observed at five sites
in South Slough, Coos Bay estuary, Oregon. Fronts at four
sites exhibited similar shoreward-seaward movements while
the remaining site showed drastic population reductions.
Shrimp density and body size were found to be significantly
greater above than below the front. There was no consistent
pattern found in grain size or interstitial water content
across the front.
In a controlled predator-exclusion experiment,
resulting shrimp densities were not significantly different
among treatments. Front shifts showed no pattern in response
to treatments. These results imply that fish predation is
not responsible for front placement. Trawls taken on both
sides of the front produced similar densities of a predatory
fish, Leptocottus armatus. Because predation pressure was calculated to be roughly equal above and below the front,
Leptocottus is not expected to be responsible for position
and movements of these fronts.
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