Explores the basics of freshwater ecology--the workings of lakes, ponds and streams--as learned while traveling by canoe or kayak, or while hiking or snorkeling. Answers questions such as, ''Of what good are mosquitoes?'' and ''Of what harm is acid rain to lakes and streams?'' Includes more than 100 illustrations of aquatic life and associated environments. One chapter covers a hypothetical three-day solo journey. A list of select national wildlife...