CLICK HERE FOR THOUSANDS OF FREE BLOGGER TEMPLATES »

Wednesday, May 14, 2008

"Definition of Danger of extinction"

What does “danger of extinction” means?
It refers to the status of any particular specie, plant or animal, where it has fewer members, whatever to be the cause, than required for multiplying the number of individuals contains it.

Why the species get this danger of extinction status?
Most of the time this happens as a result of the anthropogenic activities such as: roads construction, agriculture, industry, and livestock farming; these activities provoke a habitat break. Furthermore, some natural and sudden disasters can result in a rapid change in geographical conditions, destroying some ecosystem and erasing others. In consequence, some species result more adapted to new environments (evolution), some die in the attempt, and many others falls in the endangered category.

Loosing biodiversity: put some species in danger, and others to extinction
Despite the several advantages resulting of taking care of our ecosystems and its natural inhabitants, it has been determined and known almost 1.8 millions of species in the whole world, is has been calculated to exist between 13 until 100 millions; but the rate of extinction is so accelerate that by the 2050 year we would have lost the half, many of them unknown for the science. An approximation of how much we have been lost tell us about 60% of tropical wet jungle, 25% mammals, and 11% from the total of birds are endangered. A specific study with precise information would need a lot of money and thousands of specialists capable for gather information from fields, and dedicated only for to. It is difficult to protect what is unknown.

Causes
They can be divided into two groups: immediate and structural, the first ones are consequence of the second ones. Its impact varies at local, regional, or global levels. In other words, a same problem can have different consequences from region to region; it shows that solutions have to be designed taking into account the socio-cultural and geographical context of each region.

a) Immediate
- break and lose of the Habitat
- over exploitation of the wild life sources
- new and other species invasions
- water, soil, and atmosphere contamination

b) Structural
- demographic growth
- absence and errors of institutions
- market and political errors
- errors in the flow of information
- useless patterns of incomes and cultural
- forced expansion of the hegemonic model of development