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Portal:Extinction

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The Extinction Portal

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In biology and ecology, extinction is the cessation of existence of a species or group of taxa, reducing biodiversity. The moment of extinction is generally considered to be the death of the last individual of that species (although the capacity to breed and recover may have been lost before this point; see population bottleneck). Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "re-appears" (typically in the fossil record) after a period of apparent absence.

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The Pink-headed Duck (Rhodonessa caryophyllacea) is (or was) a large diving duck that was once found in parts of the Gangetic plains of India, Bangladesh and in the riverine swamps of Myanmar but feared extinct since the 1950s. Numerous searches have failed to provide any proof of continued existence. It has been suggested that it may exist in the inaccessible swamp regions of northern Myanmar and some sight reports from that region have led to its status being declared as "critically endangered" rather than extinct. The genus placement has been disputed and while some have suggested that it is closer to the pochards, others have placed it in a separate genus of its own.


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Bennett's Seaweed is the first extinct protist listed in the IUCN redlist.


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The WikiProject for this topic is Extinction.

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See also Wikispecies, a Wikimedia project dedicated to classification of biological species.

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