View source for Biology:Data deficient

{{Short description|IUCN species-conservation category}}

A '''data deficient''' ('''DD''') [[Biology:Species|species]] is one which has been [[Biology:Conservation status|categorized]] by the [[Organization:International Union for Conservation of Nature|International Union for Conservation of Nature]] (IUCN) as offering insufficient information for a proper assessment of [[Biology:Conservation status|conservation status]] to be made. This does not necessarily indicate that the species has not been extensively studied, but it does indicate that little or no information is available on the [[Earth:Abundance (ecology)|abundance]] and distribution of the species.

The IUCN recommends that care be taken to avoid classing species as "data deficient" when the absence of records may indicate dangerously low abundance: "If the range of a taxon is suspected to be relatively circumscribed, if a considerable period of time has elapsed since the last record of the taxon, threatened status may well be justified"<ref>"The Categories", in IUCN (1983).</ref> (see also [[Precautionary principle|precautionary principle]]).

==See also==
* IUCN Red List data deficient species
* [[Biology:List of data deficient amphibians|List of data deficient amphibians]]
* [[Biology:IUCN Red List data deficient species (Annelida)|IUCN Red List data deficient species (Annelida)]]
* [[Biology:List of data deficient arthropods|List of data deficient arthropods]]
* [[Biology:List of data deficient birds|List of data deficient birds]]
* [[Biology:IUCN Red List data deficient species (Cnidaria)|IUCN Red List data deficient species (Cnidaria)]]
* [[Biology:List of data deficient fishes|List of data deficient fishes]]
* [[Biology:List of data deficient insects|List of data deficient insects]]
* [[Biology:List of data deficient invertebrates|List of data deficient invertebrates]]
* [[Biology:List of data deficient mammals|List of data deficient mammals]]
* [[Biology:List of data deficient molluscs|List of data deficient molluscs]]
* [[Biology:List of data deficient plants|List of data deficient plants]]
* [[Biology:List of data deficient reptiles|List of data deficient reptiles]]

== References ==
{{Reflist}}

== External links ==
* {{cite web |title=2001 Categories & Criteria (version 3.1) |work=2014 IUCN Red List |access-date=2014-08-26 |year=2001 |url = http://www.iucnredlist.org/technical-documents/categories-and-criteria/2001-categories-criteria |author=IUCN }}

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{{Threatened species|state=expanded}}

[[Category:Data deficient species| ]]
[[Category:IUCN Red List]]
[[Category:Biota by conservation status]]
[[Category:IUCN Red List data deficient species| ]]

{{Sourceattribution|Data deficient}}