This introduction to basic concepts of biodiversity-sampling outlines standardized field methods for macroalgae and seagrass communities developed by NaGISA (Natural Geography in Shore Areas, a project operating under the international Census of Marine Life). NaGISA promotes simple standardized protocols and focuses on widespread nearshore habitats.This book, written by premier coastal ecologists and taxonomists, provides a text for field courses, a manual for coastal managers, and a reference guide for researchers studying biodiversity or preparing species inventories.