Degree of threat (biology)
The degree of threat is the degree that indicates the chance of survival of individual biological taxa. Many factors are taken into account when categorizing, not only the number of surviving animals, but also the increase and decrease in the population over time, known threats, the possibility of breeding in captivity and so on.
For common species (SE), there is no immediate danger to the survival of the species. Examples are human, cat, dog (see Category: Common Taxa).
Endangered species are on the red lists. The list of extinct species is called the blacklist.
IUCN Red List Global Threat
The 2001 IUCN 3.1 classification of threats divides all known species into the following categories:
IUCN Older Threat Categories 1994
The older IUCN list from 1994 had only one lower risk category, but divided into three subcategories:
Near Threatened (LR / nt)
little affected - Least Concern (LR / lc)
dependent on protection - Conservation Dependent (LR / cd) In the new IUCN list from 2001, the almost endangered and little affected categories have become independent. The protection-dependent category was included under the almost endangered category.
National threat assessment - red lists
In the red lists, the following categories are used in the Czech Republic: extinct (A1), missing (A2), unclear (A3), critically endangered (C1), severely endangered (C2), endangered (C3) and requiring further attention (C4).
According to the Nature Protection Act 114/1992 Coll. distinguished by Decree 395/1992 Coll. as amended by Decree 175/2006 Coll. critically endangered, critically endangered and endangered species.
Here, the situation is regulated by the Environment Protection and Biodiversity Conservation Act 1999.
Threat categories used in Germany:
0: extinct (ausgestorben oder verschollen)
1: critically endangered (vom Aussterben bedroht)
2: severely endangered (stark gefährdet)
3: endangered (gefährdet)
4: almost endangered (potenziell gefährdet)
R: extremely rare (extrem selten)
G: anticipated threat (Gefährdung anzunehmen)
D: missing data (Daten mangelhaft)
In: preliminarily on the list (Vorwarnliste)
+: regionally more endangered (regional stärker gefährdet)
-: regionally less endangered (regional schwächer gefährdet) See also Federal Regulation on the protection of species Bundesartenschutzverordnung.
Based on The Endangered Species Act, an Endangered Species List is created.
Pictures, sounds or videos on threat level on Wikimedia Commons
IUCN Red List (English)