2. Introduction
Throughout years of history of our planet, the species have suffered massive extinctions that have made up to 90
percent of existing species disappear.
What are massive extinctions?
These are periods in history where the planet earth in an ordinary way a lot of species died at the same time in a
limited time.
Since the appearing of the first living organism until our days, five catastrophes have occured in our planet.
These catastrophes have affected all the ecosystem, eliminating a variety of species and it has also altered the
geographic structure of the planet globally.
These events have evolved during millions of years. The catastrophes that have happened are probably tragedy to
our planet. However, there is a positive side of all these catastrophes, these changes are making our planet earth
to mature and the earth will be prepare for other evolving changes. The development of these events have brought
the birth of new species to take the place of all other extincted species
Presently, the scientists fear that our land is in the epicenter of a sixth extinction, even worse than the last one.
Even stronger extinction produced for the abuse performed to nature for the human beings.
This menace of extinction can be observed in many species (flora and fauna) that we will study in the following
presentation.
3. A species is considered
endangered, plant or
animal sea, when all
living members of that
species are in danger of
disappearing.
The IUCN has produced a
red list, which classifies
species into nine groups
IUCN
Endangered Species
An endangered species is one that has been categorised
by the IUCN as likely to become extinct.
The IUCN (International Union for Conservation of
Nature) currently lists over 3,000 species as endangered
.
EX EW CR VUEN NT LC
THREATENED
All other organisms may be listed as
Data Deficient (DD) or
Not Evaluated (NE)
4. Extinct (EX) – no
surviving individuals
(e.g. tasmanian tiger)
EX EW CR VUEN NT LC
Endangered Species
5. Extinct in Wild (EW) –
captive individuals
survive, but there is no
wild population
(e.g. Barbary Lion)
EX EW CR VUEN NT LC
Endangered Species
6. Critically
Endangered (CR) –
faces an extremely
high risk of extinction
in the near future
(e.g. Red Wolf)
EX EW CR VUEN NT LC
Endangered Species
7. Endangered (EN) –
faces a high risk of
extinction in the near
future
(e.g. Snow Leopard)
EX EW CR VUEN NT LC
Endangered Species
8. Vulnerable (VU) –
faces a high risk of
endangerment in the
medium term
(e.g. Indian rhinoceros)
EX EW CR VUEN NT LC
THREATENED
Endangered Species
9. Near Threatened (NT) –
may be considered
threatened in the near
future
(e.g. Tiger Shark)
EX EW CR VUEN NT LC
THREATENED
Endangered Species
10. Least Concern (LC) –
no immediate threat to
species survival
(e.g. Giraffe)
EX EW CR VUEN NT LC
Endangered Species
THREATENED
11. The IUCN has produced a
red list, which classifies
species into nine groups
IUCN
Endangered Species
An endangered species is one that has been categorised
by the IUCN as likely to become extinct.
The IUCN (International Union for Conservation of
Nature) currently lists over 3,000 species as endangered
.
EX EW CR VUEN NT LC
THREATENED
All other organisms may be listed as
Data Deficient (DD) or
Not Evaluated (NE)
Prepared by: Paola Cecilia Monney Juarez
https://www.linkedin.com/in/paola-monney-963966123
A species is considered
endangered, plant or
animal sea, when all
living members of that
species are in danger of
disappearing.
