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Date Permissions Signed

2-17-2016

Date of Award

Winter 2016

Document Type

Masters Thesis

Degree Name

Master of Science (MS)

Department

Environmental Sciences

First Advisor

Matthews, Robin A.

Second Advisor

Sofield, Ruth M.

Third Advisor

Blinn, Dean

Abstract

Water quality parameters, watershed characteristics and algal diversity and abundance were compared in ten lakes along the Mountain Loop Highway in Washington State. Water samples were collected in July and August 2014 and analyzed for temperature, dissolved oxygen, alkalinity, conductivity, pH, turbidity, chlorophyll, total phosphorous, total nitrogen, soluble reactive phosphorous, nitrate + nitrite, silica, chloride, sulfate, total organic carbon, dissolved organic carbon and total and dissolved metals (aluminum, antimony, arsenic, barium, beryllium, cadmium, calcium, chromium, cobalt, copper, iron, lead, magnesium, manganese, molybdenum, nickel, potassium, selenium, silver, sodium, thallium, thorium, uranium, vanadium and zinc). The watershed characteristics measured were elevation, lake surface area, watershed area, watershed slope, evergreen coverage and primary watershed geology. Live algae were collected and identified to the lowest practical taxonomic level to create a presence/absence species list. Additional algal samples were collected and preserved with Lugol’s iodine and settled for enumeration and biovolume calculations. The lakes in this study had relatively warm temperatures (11-27 °C), high dissolved oxygen concentrations (7-11 mg/L), relatively low alkalinities (< 27 mg/L) and conductivities (< 58 μS/cm) and were at circumneutral pH or basic pH (6.1-7.9). Five lakes were oligotrophic, four lakes were mesotrophic and one lake was eutrophic. Many nutrient and metal concentrations were below detection levels. Dissolved organic carbon concentrations formed two distinct groups of lakes: relatively high dissolved organic carbon (>2.0 mg/L) and relatively low dissolved organic carbon (< 2.0 mg/L). A total of 405 different algal taxa were identified from the ten lakes, of which 256 taxa were unique to an individual lake. Desmids and diatoms represented the majority of the taxa (136 taxa and 101 taxa, respectively). Cyanobacteria dominated the numerical abundance of the ten lakes, representing 86% of the total cell counts. Algal biovolume was dominated by the “other” category, which represented 77% of the total biovolume. Watershed slope was positively correlated with dissolved oxygen and negatively correlated with temperature, total phosphorous, total nitrogen, dissolved organic carbon and desmid counts. These correlations were a result of watershed morphology. Non-parametric cluster analysis created two clusters of lakes that corresponded to the high and low dissolved organic carbon groups. The two clusters of lakes had many differences in water quality, watershed characteristics and algal species richness and taxonomic diversity. The high dissolved organic carbon lakes had gradually sloped watersheds, well-developed shoreline vegetation, relatively high nutrient concentrations and high desmid diversity; the low dissolved organic carbon lakes had steep, rocky watershed slopes, little or no apparent littoral vegetation, relatively low nutrient concentrations and low desmid diversity.

Type

Text

Publisher

Western Washington University

OCLC Number

942768993

Digital Format

application/pdf

Geographic Coverage

Mountain Loop Highway (Wash.)

Genre/Form

Academic theses

Language

English

Language Code

eng

Rights

Copying of this thesis in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this thesis for commercial purposes, or for financial gain, shall not be allowed without the author's written permission.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

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