Designations associated with status based lists

 

Red lists based on IUCN Criteria

The IUCN have recently reviewed their categories and criteria to produce a clearer, more open, and easy-to-use system, the 2001 Categories and Criteria (ver 3.1). For more details visit the IUCN website.  The current spreadsheet of conservation designations includes Red List assessments made using the  pre-1994, 1994 and 2001 Red List Categories and Criteria.

 

Designation Description
Extinct Taxa which are no longer known to exist in the wild after repeated searches of their localities and other known likely places. 
Extinct in the Wild A taxon is Extinct in the wild when it is known to survive only in cultivation, in captivity or as a naturalised population (or populations) well outside the past range. A taxon is presumed extinct in the wild when exhaustive surveys in known and/or expected habitat, at appropriate times (diurnal, seasonal, annual) throughout its range have failed to record an individual. Surveys should be over a time frame appropriate to the taxon's life cycle and life form.
Critically Endangered A taxon is Critically Endangered when it is facing an extremely high risk of extinction in the wild in the immediate future, as defined by any of the criteria A to E.
Endangered A taxon is Endangered when the best available evidence indicates that it meets any of the criteria A to E for Endangered, and it is therefore considered to be facing a very high risk of extinction in the wild.
Vulnerable A taxon is Vulnerable when the best available evidence indicates that it meets any of the criteria A to E for Vulnerable, and it is therefore considered to be facing a high risk of extinction in the wild.
Rare Taxa with small populations that are not at present Endangered or Vulnerable, but are at risk. (In GB, this was interpreted as species which exist in fifteen or fewer 10km squares). Category not in 1994 or 2001 criteria, but still applicable to lists that have not been reviewed since 1994.
Lower risk - conservation dependent Taxa which are the focus of a continuing taxon-specific or habitat-specific conservation programme targeted towards the taxon in question, the cessation of which would result in the taxon qualifying for one of the threatened categories above within a period of five years. Category not in 1994 or 2001 criteria, but still applicable to lists that have not been reviewed since 1994.
Lower risk - least concern

A taxon is Least Concern when it has been evaluated against the criteria and does not qualify for Critically Endangered, Endangered, Vulnerable, Near Threatened (or Lower Risk - conservation dependant, or Nationally Scarce in Britain). Widespread and abundant taxa are included in this category.

Not Evaluated A taxon is Not Evaluated when it is has not yet been evaluated against the criteria
Data Defficient

A taxon is Data Deficient when there is inadequate information to make a direct, or indirect, assessment of its risk of extinction based on its distribution and/or population status. A taxon in this category may be well studied, and its biology well known, but appropriate data on abundance and/or distribution are lacking. Data Deficient is therefore not a category of threat or Lower Risk. Listing of taxa in this category indicates that more information is required and acknowledges the possibility that future research will show that a threatened category is appropriate.

Near Threatened

A taxon is Near Threatened when it has been evaluated against the criteria but does not qualify for Critically Endangered, Endangered or Vulnerable now (or Lower risk- conservation dependant in the pre 1994 criteria), but is close to qualifying for or is likely to qualify for a threatened category in the near future. In Britain, this category includes species which occur in 15 or fewer hectads but do not qualify as Critically Endangered, Endangered or Vulnerable.

 
Local Red Lists
Numerous 'Red Lists' have been produced by many different organisations and individuals covering geographical sub-units of GB/UK: regions, counties, districts and even parishes. These follow widely varying criteria and are not produced to a common standard. The SSA project does not cover or endorse these and they are not included on the Conservation Designations Spreadsheet. However, those involved in conservation practice covering a specific area of GB/UK may wish to use these local lists in determining conservation priorities locally. They should always be viewed in a national and international context.
 

Red listed and rare species - not based on IUCN Criteria

 
Nationally rare without IUCN designation Occurring in 15 or fewer hectads in Great Britain. Excludes rare species qualifying under the main IUCN criteria.
Nationally scarce species without an IUCN designation  Occurring in 16-100 hectads in Great Britain. Excludes rare species qualifying under the main IUCN criteria.
Bird Population Status: red Red list species are those that are Globally Threatened according to IUCN criteria; those whose population or range has declined rapidly in recent years; and those that have declined historically and not shown a substantial recent recovery.
Bird Population Status: amber Amber list species are those with an unfavourable conservation status in Europe; those whose population or range has declined moderately in recent years; those whose population has declined historically but made a substantial recent recovery; rare breeders; and those with internationally important or localised populations.
Nationally rare Occurring in 15 or fewer hectads in Great Britain
Nationally rare marine species Species which occur in eight or fewer 10km X 10km grid squares containing sea (or water of marine saline influence) within the three mile territorial limit
Nationally scarce Taxa which are recorded in 16-100 hectads (10km squares) but not included in one of the Red List Categories
Nationally scarce marine species Species which occur in nine to 55 10km X 10km grid squares containing sea (or water of marine saline influence) within the three mile territorial limit
 

UK Biodiversity Action Plan Priority Species list

 

Priority Species Taxa identified as priorities for conservation action under the UK BAP process.