Human Activities Help Alien Species to Invade the Mediterranean Sea

The Mediterranean Sea is one of the largest seas in the world and has a great diversity of marine species. Currently, the Mediterranean Sea is facing various threats, with alien species being one of the most important. To address this problem, it is very important to understand how alien species arrive and where they are in the Mediterranean Sea. Furthermore, it is necessary to evaluate whether alien species affect native marine species, and if so, what kind of effects they have. This article will describe our current knowledge about the effects of alien species in the Mediterranean Sea.