During the past several summers a series of chemical and physical measurements have been made on Lake Okoboji by staff members of the Lakeside Laboratory. This is a continuation of work begun many years ago. In the summer of 1938 an attempt was made to study the relationship between the distribution of zooplankton and chemical and physical changes. During the period June 30 to August 24 collections were made every two or three days from two stations in West Okoboji and one in East Okoboji Lake. Each collection consisted of a series of ten-liter samples pumped from various depths, concentrated by passage through a plankton net, and preserved in formalin. Temperature, dissolved oxygen and other data were recorded at the same time. A complete count by species and age groups was made of each sample for all organisms except protozoa, which were ignored.
Proceedings of the Iowa Academy of Science
©1939 Iowa Academy of Science, Inc.
"The Distribution of Zooplankton in Lake Okoboji,"
Proceedings of the Iowa Academy of Science, 46(1), 455-456.
Available at: https://scholarworks.uni.edu/pias/vol46/iss1/140