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general degradation of ecosystems is a fact most of the planet. For example, intensive land use by conventional agriculture, as well as depleting the resource, contaminated soil and aquifer media the use of pesticides and increase exponentially the natural concentration of nitrates in the ground. The rising temperatures, pollution, overpopulation, the change of periods of rainfall and the amount of these contributions, among others, the degradation of ecosystems, both terrestrial and aquatic-increasing complexity of the problem.

One of the most visible effects of ecosystem degradation is the proliferation of invasive species, plant or animal. In Europe have registered more than 10,000 alien species, about 1,400 in Spain. To get an idea of \u200b\u200bthis problem's Strategy European Union Invasive Species has been estimated at about 20,000 million per year the cost involved in the invasion of these species. When talking about this issue tend to think of alien species, ie outside the region where they are; often noted for its exotic and attract our attention. However, most of them are native species but have proliferated beyond their natural habitats. Jara nettle or are well-known cases.

growing invasion of a number of species in the environment causes serious problems in almost all trophic levels. Humans have changed since the beginning of time their environment, emphasizing this trend since the introduction of agriculture and livestock at the beginning of civilization and acute in the industrial era. Part of living things as you have adapted to changing circumstances caused by humans-in a very short period of time if we talk in terms of evolution. Another faction has succumbed and become extinct. species are called invasive, exotic or not, have used only a few circumstances that have been favorable. Many are generalist species tend to be less demanding with the various environmental parameters and, moreover, the means they find a habitat anthropic excellent for development.

This leads to a reduction in the number of species in the biosphere, both flora and fauna. Has considerably decreased biodiversity on Earth by the simple fact that a few species occupy and dominate the different habitats. Some authors explain that this has led to a homogenization, biotic homogenization on a global scale: there are fewer and species that thrive are increasingly ubiquitous in the absence of competition.

for man and nature, this loss of biotic diversity leads consequences difficult to analyze the size and complexity of the case. And besides, given the unpleasant impression that this homogenization given to all levels currently : in nature, in the political system, the economic, thought and even in the way of being of everyone.