In
ecology, a
species-area curve is a relationship between the area of a
habitat, or of part of a habitat, and the number of
species found within that area. Larger areas tend to contain larger numbers of species, and empirically, the relative numbers seem to follow systematic mathematical relationships. The species-area relationship is usually constructed for a single type of organism, such as all
vascular plants or all species of a specific
trophic level within a particular site. It is rarely, if ever, constructed for all types of organisms if simply because of the prodigious data requirements. It is related but not identical to the
species discovery curve.