Local extinction

Local extinction, also extirpation, is the termination of a species (or other taxon) in a chosen geographic area of study, though it still exists elsewhere.

The same calculations can also be applied to determine when species will disappear from nature parks ('islands' in many senses), mountain tops and mesas (see sky islands), forest remnants or other such distributional patches.

[4][5] Some species exploit or require transient or disturbed habitats, such as vernal pools, a human gut, or burnt woodland after forest fires, and are characterised by highly fluctuating population numbers and shifting distributional patterns.

A local extinction can be useful for research: in the case of the bay checkerspot butterfly, scientists, including Paul R. Ehrlich, chose not to intervene as a population disappeared from an area in order to study the process.

[6] Many crocodilian species have experienced localized extinction, particularly the saltwater crocodile (Crocodylus porosus), which has been extirpated from Vietnam, Thailand, Java, and many other areas.

These high temperatures, coupled with small wave height, led to the local extinction of bull kelp (Durvillaea spp.)

This could be caused by the introduction of non-native species, like Tilapia rendalli, into the lagoon, changes in water level and organic pollution.