Global studies show that the number of species migrating into foreign ecosystems is constantly increasing.
Not all of these species are able to establish themselves in the new environments. However, successful bio-invaders have the potential to cause major changes in their new ecosystems. Also in the Baltic Sea, numerous foreign species have been identified over the past decades.
A prominent example is the American comb jellyfish Mnemiopsis leidyi, also called sea walnut. The Latin name of the species is Blackfordia virginica. It is forming a new component of the ecosystem," says Dr.
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The species Blackfordia virginica was first described scientifically in the waters off the US state of Virginia in Later studies suggest, however, that it originates from the Black Sea. Since the s it has been found in brackish waters in northern France and since the s also in Portugal," explains Dr. Jaspers, "so here we have a species with a long successful history as invader of foreign ecosystems, that can reach very high population densities there. However, since the canal is the busiest artificial waterway in the world, ships are the most likely culprit.
As ballast water is not allowed to be pumped out in the canal, the jellyfish probably has arrived as polyps on ship hulls that have released young jellyfish, so-called Ephyres, into the water. The scientists were also able to detect specimens outside the canal, in the Kiel Fjord. I found my love and so did he!
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