Explain the role of stream macroinvertebrates in maintaining the health and ecological function of a stream. These can be any invertebrates in the stream, though focusing on insects is preferred. Explain how pollution can alter the types of macroinvertebrates seen in a stream. Discuss the different types of macroinvertebrates found in north NJ (streams/rivers such as the Passaic, Hackensack, and Raritan- and their tributaries- is a great place to start!) Give some common methods used to collect stream invertebrates to determine what species are present..