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introduce these species?

From the first movements of human populations, to the great civilizations, the time of the great geographical discoveries up to the modern and contemporary, the man has led or been brought by various reasons (business, scientific, food, etc.) thousands of species. Many of them, despite being non-native species, have made large profits and have become part of everyday life (tomatoes, potatoes, peppers, etc.).. Other affected in a tangible way ecosystems (eg, the islands of the Mediterranean basin), but such species were introduced as ancient times and are considered part of the fauna naturalized suppose, is sometimes wrongly autochthonous.

The number of introductions has increased exponentially over the last century and particularly in recent decades. The human capacity to eliminate geographic barriers has not only accelerated the phenomenon of "introductions," but that has wiped out two parameters that dominate the biology and evolution: the time and scale. Trade, transport and tourism are currently the three main factors that contribute to voluntary movement and accidental species, thereby increasing the likelihood that some of them may become a new invader. The fastest means of transport is critical to the settlement of new species in that it greatly reduces mortality "in the way." In addition there are other factors that may influence the colonization rate as are the characteristics of the areas of entry and the degree of disturbance, the effects of climate change, etc.

From the operational point of view is crucial to distinguish between alien species introductions:

-Intentional: made by man, consciously and for specific purposes. For example, trade in exotic pets, plants ornamental, etc.

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Unintentional: occurring accidentally or transport or the introduction is made consciously. However always occur through human agents and is strictly related to the pathways or vectors through which alien species enter. For example, the entry of species through ballast water of ships by fouling, etc.

-Negligent: a) there are leaks of species held in captivity for lack of necessary security measures and b) introductions occur through pathways known as high risk for which no action has been taken prevention. For example, escapes from fur farms.