For sedentary forms (e.g., corals, many molluscs), &quot; currencies &quot; for measurements may be relatively easy to identify as the spatial distribution and density of the species (present or historical) may form a sufficient basis for measurement of the environmental features to which it responds.
For sedentary forms (e.g., corals, many molluscs), &quot; currencies &quot; for measurements may be relatively easy to identify as the spatial distribution and density of the species (present or historical) may form a sufficient basis for measurement of the environmental features to which it responds.