A limnological study of a bog lake which has never developed a marginal mat

TitleA limnological study of a bog lake which has never developed a marginal mat
Publication TypeJournal Article
Year of Publication1938
AuthorsWelch PSmith
JournalTransactions of the American Microscopical Society

1. Munro Lake represents a type of bog lake in which no marginal mat formation has occurred. 2. The major physico-chemical conditions, extending over 10 summers, are described. 3. About 120 net plankters are listed. Among other things, the list shows: (1) many genera compared with the number of species; (2) more phytoplankters than zooplankters; (3) limited number of diatoms and copepods; and (4) numerical prominence of the Chroococcaceae, Desmidiaceae, Protozoa, Rotifera and Cladocera. 4. Quantitative net-plankton studies during the summer season show: (1) preponderance of the phytoplankton; (2) large quantities of Microcystis; (3) more Protozoa and Rotifera than other groups of zooplankton; (4) small quantity of diatoms; (5) restricted quantities of Cladocera and Copepoda in the zooplankton; and (6) restricted nature of the whole plankton. 5. The bottom fauna is now much reduced. Sphaeridae and Corethra are the numerically dominant groups. 6. Eighteen species of fish are recorded from this lake. 7. Biological productivity in this lake is much reduced. 8. This lake is now in a senescent stage. Bottom encroachment is the sole cause of basin reduction; marginal encroachment is absent. Sediments are almost wholly autochthonous.