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Mexico is one of 17 countries characterized as "mega-diverse" because of the number of species and the wide variety of aquatic and terrestrial ecosystems present, due to its geography, a convergence of Nearctic and Neotropical regions. They alter ecosystems, affect native species, and cause severe damage to environmental services and public health, and can even cause economic losses (CANEI, 2010).

This has favored the existence of a considerable number of habitats with diversely distant species. In Mexico, invasive species are of great interest due to the negative effect on native biodiversity, occasional changes in the regional community structure, and the impact on economic and social contexts (Winfield et al., 2011).

Economic, social and cultural exchange between Mexico and other countries has also facilitated the entry of exotic and invasive species (Winfield et al., 2011). The type of community invaded (rare or common, fragile or robust). Invasive behavior is not restricted to alien species, as some native species can become invasive when introduced to an ecological region distant from their usual area but in the same country (translocation), or even in their place of origin when the ecological dynamic has been altered (CONABIO, 2009).

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The definition given by the Convention on Biological Diversity in 2009 is "An exotic species established in habitats and natural or semi-natural ecosystems; it is an agent of change and a threat to native biodiversity" (Santa Catalina Island Conservancy, 1997). Its distribution (localized or widespread, insular or on land, etc.). Today, a variety of organisms are transported and introduced to new areas for productive purposes. The deterioration of natural resources and environmental services caused by invasive species affect food production and can be devastating to agricultural ecosystems (CANEI, 2010). Invasive Species Specialist Group (ISSG) Global Invasive Species Database.

Invasive species are classified taking into account six criteria of management: 1. In the last 100 years, the modernization of transport, means of communication, and new trade routes has increased international and accidental movement of exotic species to unprecedented levels (Burgie et al. In Mexico the effects of invasive species has been documented since the arrival of the Europeans (). International Maritime Organization, International Convention for the Control and Management of Ships’ Bal- last Water and Sediments (BWM) Revisado en: .

Invasive species are a major cause of the loss of biodiversity worldwide (Naranjo and Dirzo 2009).

Colonization brought about the systematic introduction of animals for economic purposes, but also the occasional arrival of unwanted visitors that became pests (Challenger, 1998). Remains of Pleistocene birds from Isla Guadalupe, México. Revisado en: https://edu/sites/default/files/journals/condor/v078n03/p0421-p0422IMO.

On account of these problematic intruders, many ecosystems were being impoverished and many species driven to extinction ().

There are three divisions: Not all exotic species become invasive immediately, and potential effects of a non-native species are unpredictable (DET). hl=es&lr=&id=Sklz7t AUa4IC&oi=fnd&pg=PR9&dq=Howell,+Steve+N.+G.+y+Sophie+Webb.+1995.+A+Guide+to+the+Birds+of+Mexico+and+Northern+Central+America.+Oxford+University+Press&ots=h HAW9VQq Ni&sig=1m Iind-YM6g C_r Gw60xq-ep BALk&redir_esc=y#v=onepage&q=Howell%2C%20Steve%20N.%20G.%20y%20Sophie%20Webb.%201995.%20A%20Guide%20to%20the%20Birds%20of%20Mexico%20and%20Northern%20Central%20America.%20Oxford%20University%20Press&f=false Hubbs, C.

The problems related to invasive exotic species are complex and vast, the biggest obstacle being that it is a little-known and underestimated topic (Espinosa García, 2009). A guide to the birds of Mexico and northern Central America.

Island biodiversity is vulnerable to introduced species, because in these environments there is a high proportion of endemic species that lack defense mechanisms against exotic species with which they did not co-evolve (CANEI, 2010). Ciencias (58) Revisado en: File/11716/11040 Howell, S.

In particular, for island birds the risk of extinction is forty times higher than for continental species (Trevino et al., 2007).

It is the leading cause of biodiversity loss in that region (Aguirre Muñoz et al. 62% of mammals, 88% of birds, 54% of amphibians, 86% of reptiles and 68% of mollusks that have been reported extinct are island species (Baillie et al., 2004).

On Mexican islands 12% of endemic birds and 20% of endemic mammals have become extinct because of introduced species (Aguirre Muñoz et al., 2009).

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