Biology ETDs

Publication Date



Levels, sources, and biological influence of nitrogen and phosphorus in Lake Powell, Utah-Arizona were examined. The reservoir, one of the three largest in the United States, is a mainstream impoundment on the Colorado River and is classified as a warm monomictic with meromixis exhibited in deeper waters.

Nutrient concentrations in the reservoir were characteristic of a mesotrophic lake. Mean total phosphorus concentration was 17 mg m-3 during the study, while total nitrogen averaged 531 mg m-3. Nitrate was the dominant form of nitrogen. Distribution of both nutrients exhibited patterns previously described for lakes to some extent, but were substantially influenced by density currents generated by the inflows of the Colorado River. Depletion of ortho-phosphate was common in the epilimnion during the summer months.

Project Sponsors

National Science Foundation



Document Type


Degree Name


Level of Degree


Department Name

UNM Biology Department

First Committee Member (Chair)

David Kidd

Second Committee Member

C.S. Crawford

Third Committee Member

L. Potter

Fourth Committee Member

Manuel C. Molles, Jr.

Fifth Committee Member

J. Gosz

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Biology Commons