In order to determine the source of bacteria in Tillamook Bay,
Oregon, water samples were collected monthly for six months during
the rainy season from October 1975 through March 1976 from the bay
and its tributaries, the Kilchis, Trask, Tillamook, and Wilson
Rivers.
Fecal coliform levels of these samples were determined and the
1,917 bacteria isolated were tested for their resistance patterns
to chloramphenicol (Cm), streptomycin (Sm), ampicillin (Am), tetracycline
(Tc), chlortetracycline (Ct), oxytetracycline (Ot), neomycin
(Nm), nitrofurazone (Ni), nalidixic acid (Na), sulfathiazole (Su),
kanamycin (Km), and procaine penicillin G (Pe).
The fecal coliform count per 100 ml of bay water ranged from
3.6 to 42.0. The counts for Tillamook River ranged from 13.5 to
112.0, Trask River from 0.0 to 132.0, Wilson River from 8.5 to 105.0,
and Kilchis River from 0.5 to 13.9. The rise and fall of fecal
coliform levels were characteristic of the sampling date and each sampling station showed its characteristic maximum and minimum levels.
The 1,917 fecal coliform isolates showed 176 different resistance
patterns to the 12 antibiotics tested. None of the patterns, however,
was characteristic of any specific sampling site.
The fecal coliform counts of the bay were statistically compared to
135 independent variables that included the fecal coliform counts of
tributaries, temperature, river flow data, tide information, antibiotic
use data, and the antibiotic resistance patterns.
Bay fecal coliform levels were highly correlated with the fecal
coliform counts of tributaries especially those of the Trask and Wilson
Rivers, degree of resistance to antibiotics, recreational activities,
and precipitation. Negative correlation existed between bay fecal
coliform count and the ambient temperature.
two potentially useful linear regression models to predict bay
fecal coliform level were developed using a computerized stepwise multiple
linear regression program. / Graduation date: 1977
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/27142 |
| Date | 15 February 1977 |
| Creators | Kelch, William James |
| Contributors | Lee, Jong S. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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