Occurrence

Occurrence [ Ecology ]
(Also: Element Occurrence )

Dictionary of botanic terminology
index of names

The number of possible appearances of an element.

In ecology an occurrence is a general term describing the amount of elements of biodiversity (e.g. species or ecological community) found in corresponding but separate environments, divided by a natural barrier.
For example the number (or presence) of separate population of a given species (including sub-species, varieties and hybrids) found in a landscape, area of land and/or water.
An element occurrence has conservation value for the element: it is a location important to the conservation of the species or community. For a species, an element occurrence is generally the habitat occupied by a local population (identified by geographic and habitat information, number of individuals, age and dimension of the colony etc) What constitutes an occurrence varies among species. For an ecological community, an element occurrence may be the area containing a patch of that community type.

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