Sofía García Mansilla
Purpose of the presentation
Meaning of Extinction
Red List of Endengared Animals
One case of Extinction
The purpose of the presentation is to……..
Help the animals in extinction .
Show other people what they can do.
Protect the habitats of different animals
Extiction is the end of an organism or a group of organisms. The moment of
extinction is generally considered to be the death of the last individual of the
species (although the capacity to breeth and recover may have been lost
before this point). Species become extinct when the last extisting member of
that generation dies.
There are variety of causes that can contribute directly or indirectly to the extinction
of a species or group of species. Most simply, any species that is unable to survive
or reproduce in its enviroment, and unable to move to a new environment where it
can do so, dies out and becomes extinct. Currently , environmental groups and
some government are concerned with the extinction of species caused by
humanity, and are attempting to combat further extinctions through a variety of
conservation programs. Humans can cause extinction of a species through
overharvesting, pollution, habitat destruccion, introduccion of new predators and
food competitors, overhunting, and other influences.
The degradation of a spices habitat may alter the fitness landscape to such
an extent that the species is no longer able to survive and becomes extinct.
This may occur by direct effects such as the enviroment becoming toxic, or
against new competitor species. Habitat degradation can also take the form of
a physical destrucction of niche habitats.
Extinct: the last remaining member of the species has died, or is presumed beyond
reasonable doubt to have died. Examples: javan tiger, thylacine, dodo, passenger ,
pigeon, caribean monk seal, dimetrodon aurochs, dusky, seaside sparrow.
Extinct in the wild: captive individuals survive but there is no free-living, natural
population. Examples: alagoas curassow, dromedary.
Critically endangered: faces an extremely high risk of extiction in the immediate
future. Examples: mountain gorilla, aracan forest turtle, javan rhino, brazilian
merganser, gharial, vaquita.
Endangered: faces a very high risk of extinction in the near future. Examples:
dhole, blue whale, bonobo, ethiopian wolf, giant panda, snow leopard.
Polar bears use the sea ice as a springboard into the ocean from which they
hunt seals. Seals also use the ice as a platform from which to dive for food and
on which they give birth to their babies. With the global warming, polar sea ice
is melting and breaking up more than it used to during summer months.
Without this platforms of ice, the seals are further away and the polar bears
have to swim longer distances to find their prey. Sometimes on their journeys
the bears get tired and drown .
After all this, we know that many animals are in danger of extinction because
of us. And sometimes we say that they are not important. We can make
many things to help them, they need our help. We think that many animals
are dying because of the pollution. We can help them by changing and
making many things:
We have to start recycling a bit more
Tell our perents to help in our project
Start using ecologyc bags.