Using basic principles of marine biology and physics, she explains how moving water transports organisms and their reproductive cells among the rocky crevasses and other niches in the partially submerged shoreline
. This constant mixing results in the proliferation of life in many microhabitats.
For me, the most telling of these digressions is the story of the bitterly fought and defeated plan to replace Manhattan's West Side Highway with Westway, a submerged shoreline
transportation corridor in the Hudson River that would have been decked over with several hundred acres of parkland.