Data Deficient Species
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A data deficient (DD)
species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...
is one which has been categorized by the
International Union for Conservation of Nature The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the stat ...
(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 usually indicates that little or no information is available on the
abundance Abundance may refer to: In science and technology * Abundance (economics), the opposite of scarcities * Abundance (ecology), the relative representation of a species in a community * Abundance, the defining characteristic of abundant numbers * ...
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 varia ...
of the species. It can also indicate uncertainty about the taxonomic classification of an organism; for example, the IUCN classifies the
orca The orca (''Orcinus orca''), or killer whale, is a toothed whale and the largest member of the oceanic dolphin family. The only extant species in the genus '' Orcinus'', it is recognizable by its black-and-white-patterned body. A cosmopol ...
as "data deficient" because of the likelihood that two or more types of the whale are separate 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 The precautionary principle (or precautionary approach) is a broad epistemological, philosophical and legal approach to innovations with potential for causing harm when extensive scientific knowledge on the matter is lacking. It emphasizes cautio ...
).


See also

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IUCN Red List data deficient species On 29 January 2010, the IUCN Red List of Threatened Species identified 6,702 (5,913 Animalia (1 Annelida, 1,328 Arthropoda, 3,814 Chordata, 149 Cnidaria, 617 Mollusca, 3 Nemertina, 1 Onychophora), 780 Plantae, 9 Protista) data deficient species. ...
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List of data deficient amphibians As of January 2022, the International Union for Conservation of Nature (IUCN) lists 1193 data deficient amphibian species. 16% of all evaluated amphibian species are listed as data deficient. No subpopulations of amphibians have been evaluated b ...
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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 ...
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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 def ...
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List of data deficient birds As of December 2020, the International Union for Conservation of Nature (IUCN) lists 46 data deficient avian species. 0.47% of all evaluated avian species are listed as data deficient. No subpopulations of birds have been evaluated by the IUCN. ...
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IUCN Red List data deficient species (Cnidaria) On 29 January 2010, the IUCN Red List of Threatened Species identified 149 data deficient species in the Cnidaria phylum (Animalia kingdom). Anthozoa Actiniaria Edwardsiidae Scleractinia Acroporidae Agariciidae Astrocoeniidae Caryophyl ...
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List of data deficient fishes In September 2016, the International Union for Conservation of Nature (IUCN) listed 3191 data deficient fish species. A data deficient species is one which has been categorized by the IUCN as offering insufficient information for a proper assessm ...
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List of data deficient insects In July 2016, the International Union for Conservation of Nature (IUCN) listed 1702 data deficient insect species. Of all evaluated insect species, 28% are listed as data deficient. No subpopulations of insects have been evaluated by the IUCN. ...
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List of data deficient invertebrates As of July 2016, the International Union for Conservation of Nature (IUCN) lists 5278 data deficient invertebrate species. 29% of all evaluated invertebrate species are listed as data deficient. The IUCN also lists 57 invertebrate subspecies as ...
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List of data deficient mammals In September 2016, the International Union for Conservation of Nature (IUCN) listed 783 data deficient mammalian species. Of all evaluated mammalian species, 14% are listed as data deficient. The IUCN also lists 30 mammalian subspecies as data d ...
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List of data deficient molluscs In September 2016, the International Union for Conservation of Nature (IUCN) listed 1988 data deficient mollusc species. Of all evaluated mollusc species, 27% are listed as data deficient. The IUCN also lists 40 mollusc subspecies as data defici ...
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List of data deficient plants As of September 2016, the International Union for Conservation of Nature (IUCN) lists 1674 data deficient plant species. 7.6% of all evaluated plant species are listed as data deficient. The IUCN also lists 18 subspecies and 57 varieties as data ...
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List of data deficient reptiles As of September 2016, the International Union for Conservation of Nature (IUCN) lists 910 data deficient reptile species. 18% of all evaluated reptile species are listed as data deficient. Of the subpopulations of reptiles evaluated by the IUCN, ...


References


External links

* {{Portal bar, Ecology, Biology IUCN Red List Biota by conservation status