Rate of species diversity restoration following stress in freshwater protozoan communities

TitleRate of species diversity restoration following stress in freshwater protozoan communities
Publication TypeJournal Article
Year of Publication1969
AuthorsJr. JCairns
JournalThe University of Kansas Science Bulletin
Volume48
Issue6
Pagination209-224
KeywordsWATER CHEMISTRY
Abstract

Fresh-water protozoan communities inhabiting plastic troughs through which unfiltered Douglas Lake (Michigan) water flowed were exposed to pH and temperature shocks. The time required for the community to achieve a species diversity (i.e., number of species) comparable to that existing before the shock as well as the control diversity was studied. Diversity was the only charactersitic studied. Others, such as numbers of individuals and nutritive relationships, though important, were beyond the scope of this study. The two most important conclusions to be drawn from this preliminary study are (1) the magnitude or intensity of the shock seems to be more important in reducing protozoan species diversity than its duration and (2) restoration of protozoan species diversity may require only a few hours if the shock is mild, but as much as five or six days for severe shocks. The latter is probably true only of pH, temperature and other shocks where there is no toxicant residual left in either substrate or organisms.