A division or part of a region (in various senses of the noun); an area within a region.

Biology and Ecology. An area containing a distinctive flora or fauna, esp. a division of a biogeographical region.

Biology and Ecology. A primary zoogeographical division of the earth's surface.

Biology. The surface or material on which any particular organism occurs or grows. Cf. substratum, n. 4c.

Ecology. A small area, typically of one square metre or less, marked out (often as one of several such randomly distributed areas) for studying…

A line or a belt of land along which a survey is made of the plant or animal life or some other feature; a survey of this kind.

An environmentally uniform region of a habitat, occupied by a particular biological community. Cf. biochore, n. 2.

= basal area n. (a).

a small, usually specialized habitat within a larger habitat.

(a) the area situated at or forming the base; spec. in Ecology (see quot. 1962); (b) Forestry the area of the cross-section of a tree at a height of…

In spec. uses. Ecology. (See quot. 1976.)