Search results
Results from the WOW.Com Content Network
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. Local extinctions are contrasted with global extinctions. [1] [2] Local extinctions mark a change in the ecology of an area.
In ecology, extinction is sometimes used informally to refer to local extinction, in which a species ceases to exist in the chosen area of study, despite still existing elsewhere. Local extinctions may be made good by the reintroduction of individuals of that species taken from other locations; wolf reintroduction is an example
The reasons for extinction range from natural occurrences, such as shifts in the Earth's ecosystem or natural disasters, to human influences on nature by the overuse of natural resources, hunting and destruction of natural habitats.
Permian–Triassic extinction event 252 Ma Large igneous province (LIP) eruptions [ 23 ] from the Siberian Traps , [ 24 ] an impact event (the Wilkes Land Crater ), [ 25 ] an Anoxic event , [ 26 ] an Ice age , [ 27 ] or other possible causes
The largest extinction was the Kellwasser Event (Frasnian-Famennian, or F-F, 372 Ma), an extinction event at the end of the Frasnian, about midway through the Late Devonian. This extinction annihilated coral reefs and numerous tropical benthic (seabed-living) animals such as jawless fish, brachiopods, and trilobites.
Defaunation is the global, local, or functional extinction of animal populations or species from ecological communities. [4] The growth of the human population , combined with advances in harvesting technologies, has led to more intense and efficient exploitation of the environment. [ 5 ]
the local extinction of species that do not have at least one fragment capable of supporting a viable population; edge effects that alter the conditions of the outer areas of the fragment, greatly reducing the amount of true forest interior habitat. [70]
Functional extinction is the extinction of a species or other taxon such that: It disappears from the fossil record , or historic reports of its existence cease; [ 1 ] The reduced population no longer plays a significant role in ecosystem function; [ 2 ] [ 3 ] [ 4 ]