CITES
Appendix I
Appendix II
Appendix III
IUCN Red List
Each species on the Red List is given a rating
according to specified criteria which are divided
into three basic categories. The rating is represented
as a series of letters, which correspond to those
listed below. For example, the rating for the
Blue Whale is "EN A1abd", which means "Endangered
according to the sub-criteria 1a, 1b and 1d of
criterion A" - i.e. "Population reduction in the form of
an observed, estimated, inferred or suspected
reduction of at least
80% over the last 10 years or three generations,
whichever is the
longer, based on (and specifying) the
following:
- direct observation
- an index of abundance appropriate for the taxon and
- actual or potential levels of exploitation. "
These categories and criteria are defined by
the IUCN.
The Red List categories are described
as follows:
- Critically Endangered (CR)
The species faces an extremely high risk of
extinction in
the immediate future as defined by criteria set out
in a paper prepared by the
IUCN Species Survival
Commission. For the sake of easy reference, these
criteria are reprinted below:
"
- Population reduction in the form of either of
the following:
- An observed, estimated, inferred or suspected
reduction of at least
80% over the last 10 years or three generations,
whichever is the longer,
based on (and specifying) any of the following:
- direct observation
- an index of abundance appropriate for the taxon
- a decline in area of occupancy, extent of
occurrence and/or quality
of habitat
- actual or potential levels of exploitation
- the effects of introduced taxa, hybridisation,
pathogens, pollutants,
competitors or parasites.
- A reduction of at least 80%, projected or
suspected to be met within
the next ten years or three generations, whichever
is the longer, based
on (and specifying) any of (b), (c), (d) or (e) above.
- Extent of occurrence estimated to be less than
100 km2 or area of occupancy
estimated to be less than 10 km2, and estimates
indicating any two of the
following:
- Severely fragmented or known to exist at only a
single location.
- Continuing decline, observed, inferred or
projected, in any of the
following:
- extent of occurrence
- area of occupancy
- area, extent and/or quality of habitat
- number of locations or subpopulations
- number of mature individuals.
- Extreme fluctuations in any of the following:
- extent of occurrence
- area of occupancy
- number of locations or subpopulations
- number of mature individuals.
- Population estimated to number less than 250
mature individuals and either:
- An estimated continuing decline of at least 25%
within 3 years or one
generation, whichever is longer or
- A continuing decline, observed, projected, or
inferred, in numbers
of mature individuals and population structure in
the form of either:
- severely fragmented (i.e. no subpopulation
estimated to contain more
than 50 mature individuals)
- all individuals are in a single subpopulation.
- Population estimated to number less than 50
mature individuals.
- Quantitative analysis showing the probability of
extinction in the
wild is at least 50% within 10 years or 3
generations, whichever is the
longer. "
- Endangered (EN)
The species is facing a very high risk of
extinction in the wild in the near future, as
defined by any of the following criteria (reprinted
for reference):
"
- Population reduction in the form of either of
the following:
- An observed, estimated, inferred or suspected
reduction of at least
50% over the last 10 years or three generations,
whichever is the longer,
based on (and specifying) any of the following:
- direct observation
- an index of abundance appropriate for the taxon
- a decline in area of occupancy, extent of
occurrence and/or quality
of habitat
- actual or potential levels of exploitation
- the effects of introduced taxa, hybridisation,
pathogens, pollutants,
competitors or parasites.
- A reduction of at least 50%, projected or
suspected to be met within
the next ten years or three generations, whichever
is the longer, based
on (and specifying) any of (b), (c), (d), or (e)
above.
- Extent of occurrence estimated to be less than
5000 km2 or area of
occupancy estimated to be less than 500 km2, and
estimates indicating any
two of the following:
- Severely fragmented or known to exist at no
more than five locations.
- Continuing decline, inferred, observed or
projected, in any of the
following:
- extent of occurrence
- area of occupancy
- area, extent and/or quality of habitat
- number of locations or subpopulations
- number of mature individuals.
- Extreme fluctuations in any of the following:
- extent of occurrence
- area of occupancy
- number of locations or subpopulations
- number of mature individuals.
- Population estimated to number less than 2500
mature individuals and
either:
- An estimated continuing decline of at least 20%
within 5 years or 2
generations, whichever is longer, or
- A continuing decline, observed, projected, or
inferred, in numbers
of mature individuals and population structure in
the form of either:
- severely fragmented (i.e. no subpopulation
estimated to contain more
than 250 mature individuals)
- all individuals are in a single subpopulation.
- Population estimated to number less than 250
mature individuals.
- Quantitative analysis showing the probability
of extinction in the
wild is at least 20% within 20 years or 5
generations, whichever is the
longer. "
- Vulnerable (VU)
The species is facing a high risk of extinction
in the wild in the medium-term future, as defined by
any of the following criteria (reprinted
for reference):
- Population reduction in the form of either of
the following:
- An observed, estimated, inferred or suspected
reduction of at least
20% over the last 10 years or three generations,
whichever is the longer,,
based on (and specifying) any of the following:
"
- direct observation
- an index of abundance appropriate for the taxon
- a decline in area of occupancy, extent of
occurrence and/or quality
of habitat
- actual or potential levels of exploitation
- the effects of introduced taxa, hybridisation,
pathogens, pollutants,
competitors or parasites.
- A reduction of at least 20%, projected or
suspected to be met within
the next ten years or three generations, whichever
is the longer, based
on (and specifying) any of (b), (c), (d) or (e) above.
- Extent of occurrence estimated to be less than
20,000 km2 or area of
occupancy estimated to be less than 2000 km2, and
estimates indicating
any two of the following:
- Severely fragmented or known to exist at no more
than ten locations.
- Continuing decline, inferred, observed or
projected, in any of the
following:
- extent of occurrence
- area of occupancy
- area, extent and/or quality of habitat
- number of locations or subpopulations
- number of mature individuals.
- Extreme fluctuations in any of the following:
- extent of occurrence
- area of occupancy
- number of locations or subpopulations
- number of mature individuals.
- Population estimated to number less than 10,000
mature individuals
and either:
- An estimated continuing decline of at least 10%
within 10 years or
3 generations, whichever is longer, or
- A continuing decline, observed, projected, or
inferred, in numbers
of mature individuals and population structure in
the form of either:
- severely fragmented (i.e. no subpopulation
estimated to contain more
than 1000 mature individuals)
- all individuals are in a single subpopulation.
- Population very small or restricted in the form
of either of the following:
- Population estimated to number less than 1000
mature individuals.
- Population is characterised by an acute
restriction in its area of
occupancy (typically less than 100 km2) or in the
number of locations (typically
less than 5). Such a taxon would thus be prone to
the effects of human
activities (or stochastic events whose impact is
increased by human activities)
within a very short period of time in an
unforeseeable future, and is thus
capable of becoming Critically Endangered or even
Extinct in a very short
period.
- Quantitative analysis showing the probability
of extinction in the
wild is at least 10% within 100 years. "
South African Red Data Book