Aquatic biota in North America
This chapter consists of two sections that represent complementary approaches to the description of the distribution of aquatic biota on the North American continent. The first section, by Patrick, deals with aquatic life in rivers in the United States and emphasizes the geologic, hydrologic, and hydraulic characteristics that affect the spatial distribution of the biota. These principles, as indicated in the section by Williams, also relate to distribution throughout the North American continent. The geographic distribution itself is elucidated in the text and is organized around the factors influencing that distribution.
The second section, on the distribution of biota in Canadian and other North American waters, describes the spatial or geographic distribution of major aquatic biota in the river systems of Canada. It includes maps depicting the geographic distribution throughout the North American continent of selected species of fish, indicative of the wide range of spatial characteristics of these distributions. Together the two sections emphasize both the geographic distribution throughout the North American continent of selected species of fish, indicative of the wide range of spatial characteristics of these distributions, and the factors influencing those distributions throughout the continent.