A data deficient (DD)
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriat ...
is one which has been
categorized by the
International Union for Conservation of Nature
The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...
(IUCN) as offering insufficient information for a proper assessment of
conservation status
The conservation status of a group of organisms (for instance, a species) indicates whether the group still exists and how likely the group is to become extinct in the near future. Many factors are taken into account when assessing conservation ...
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
abundance and
distribution Distribution may refer to:
Mathematics
* Distribution (mathematics), generalized functions used to formulate solutions of partial differential equations
*Probability distribution, the probability of a particular value or value range of a vari ...
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"
["The Categories," in IUCN (1983).] (see also
precautionary principle).
See also
*
IUCN Red List data deficient species
*
List of data deficient amphibians
*
IUCN Red List data deficient species (Annelida)
On 29 January 2010, the IUCN Red List of Threatened Species identified 1 data deficient species in the Annelida phylum ( Animalia kingdom).
Polychaeta Eunicida Eunicidae
References
* IUCN 2009. IUCN Red List of Threatened Species
The Inter ...
*
List of data deficient arthropods
As of July 2016, the International Union for Conservation of Nature (IUCN) lists 2875 data deficient arthropod species. 30% of all evaluated arthropod species are listed as data deficient.
The IUCN also lists 17 arthropod subspecies as data defi ...
*
List of data deficient birds
*
IUCN Red List data deficient species (Cnidaria)
*
List of data deficient fishes
*
List of data deficient insects
*
List of data deficient invertebrates
*
List of data deficient mammals
*
List of data deficient molluscs
*
List of data deficient plants
*
List of data deficient reptiles
References
External links
*
{{Portal bar, Ecology, Biology
IUCN Red List
Biota by conservation status