Includes: Day, et al., 1989, Estuarine
Ecology, selections
Warner, 1975, Beautiful Swimmers, chapter 1, "The Bay"
EPA, 2000, Introduction to an Ecosystem
The reading from Day provides basic background information about important characteristics of estuaries. The material in Warner can be gotten from other sources but this is a particularly well-writtten piece and can be read quickly. The EPA piece is written at or slightly above a middle-school level but still provides some useful background.
2. Apart from these readings, you should take a look at the following.