To avoid confusion, it is advisable to differentiate between native, introduced or invasive species. In the first case, the species arrive by themselves to a place where they settle and remain for generations; in the second, they reach the territory through direct or facilitated human action, “for example, connecting watersheds.” However, most introductions fail because they fail to adapt to the new environment. The few species that do achieve this can become invasive, as they are distributed in large numbers and spread throughout the territory, which can cause negative effects on the ecosystem. Controversial legislation How is the presence of these exotic species regulated in Spain? In the framework of Law 42/2007 on Natural Heritage

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and Biodiversity , in 2011, a Catalog of Invasive Lesotho Email Lists Alien Species and a List of Exotic Species with Invasive Potential were approved . Fishermen and hunters raised their voices against some of the species that appeared on the list because it was detrimental to their interests. Two years later, the government removed from the list species that scientists and ecologists considered dangerous, so the latter appealed the decision to the Supreme Court. Now, the highest judicial body agrees with a ruling that forces species such as carp and rainbow trout to be considered invasive. After this decision, Elvira, along with other scientists and ecologists, requested a few weeks ago in a press conference that the Ministry of Agriculture, Food and Environment

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expedite the execution of this sentence and that the appropriate protection measures be taken. The invaders, on stage “Altering the evolutionary natural order can be very dangerous”, considers the researcher, and explains it with an example. In 1965, the zoologist and ecologist George E. Hutchinson published The Ecological Theater and the Evolutionary Drama , where he invited the reader to imagine the ecological world as a theater where a play that is the evolutionary drama is performed. In this play, new characters (which would be the introduced species) can enter the scene. If there is a small change in the script, the consequences can be negligible, but when the new character alters the scene so much that it changes to the stage in which

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