Comparison between numbers and kinds of freshwater protozoans colonizing autoclaved and unautoclaved polyurethane foam substrates.

Autoclaved and unautoclaved polyurethane substrates were placed in Douglas Lake, Michigan, to determine whether fatty amines produced by autoclaving affected the colonization process. These results indicate that there was no major difference in the numbers of colonizing species in either kind of substrate. The kinds of species showed considerable overlap among the categories of substrate.