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" It is important to recognise that taxa that are poorly known can often be assigned a threat category on the basis of background information concerning the deterioration of their habitat and/or other causal factors; therefore the liberal use of 'Data Deficient'... "
1996 IUCN Red List of Threatened Animals - Страница 363
написао/ла Ulf Gärdenfors, A. J. Stattersfield, International Union for Conservation of Nature and Natural Resources. Species Survival Commission - 1996 - 448 страница
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Conifers: Status Survey and Conservation Action Plan

Aljos Farjon, Christopher Nigel Page - 1999 - 121 страница
...life histories they exhibit. Even though some criteria will be inappropriate for certain taxa (some taxa will never qualify under these however close...extinction risk has been made, though for different reasons.Until such time as an assessment is made, species listed in these categories should not be...
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IUCN Red List Categories and Criteria

International Union for Conservation of Nature and Natural Resources, Iucn Species Survival Commission, International Union for Conservation of Nature and Natural Resources. Species Survival Commission - 2001 - 30 страница
...habitat and/or other causal factors; therefore the liberal use of 'Data Deficient' is discouraged. 9. Implications of listing Listing in the categories...reasons. Until such time as an assessment is made, taxa listed in these categories should not be treated as if they were non-threatened. It may be appropriate...
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Equids: Zebras, Asses, and Horses : Status Survey and Conservation Action Plan

Patricia Des Roses Moehlman, IUCN/SSC Equid Specialist Group - 2002 - 189 страница
...habitat and/or other causal factors; therefore the liberal use of 'Data Deficient' is discouraged. 9. Implications of listing Listing in the categories...reasons. Until such time as an assessment is made, taxa listed in these categories should not be treated as if they were non-threatened. It may be appropriate...
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