... suspended or- ganisms, the plankton, such as phytoplankton (plants) and zooplankton (ani- mals), and some consumers such as insects and fish. Plankton are small organ- isms that can feed and reproduce ... particularly, stream ecology and self- purification, the two different ecosystems, land and freshwater habitats, will be contrasted. 95~ arr, J., Design for a Livable Planet. New York: Harper & ... water) and lentic (standing water) are highlighted. ' 13~evern, N. R., King, D. L., and Ring, R., "Lake Classification Systems, Part I," The Michigan Riparian, pp. 4 -5 ,...