Biology ETDs

Publication Date

Summer 6-11-1948


Grinnell Lake, Lake Josephine, and Swiftcurrent Lake, at an elevation of approximately 5,000 feet in northwestern Montana, are comparable with lakes in the montane zone defined by Pennak for lakes at elevations between 8,200 feet and 10,500 feet in the Rocky Mountains of northern Colorado. Five species of Copepoda, six Cladocera, and four Ostracoda were collected in the lakes studied. The population of microcrustacea in these lakes was most dense in or slightly above the masses of rooted aquatic vegetation growing to a height of six to 10 inches above the bottom wherever the water was between three feet and 20 feet deep. Frequent qualitative collections with the plankton net indicated that the population density at other depths in both lakes was low. Quantitative collections verified that the only groups more abundant than one individual per liter at intermediate depths were the immature Copepoda in July and Bosmine longirostris in August. The species of Copepoda and Cladocera inhabiting these labs are widely distributed in lowland lakes and in lakes in alpine areas of America and Europe.




Microcrustacea, Copepoda, Glacier National Park

Document Type


Degree Name


Level of Degree


Department Name

UNM Biology Department

First Committee Member (Chair)

C. Clayton Hoff

Second Committee Member

Eugene W. Rypka

Third Committee Member

William H. Koster