Sunday, September 21, 2008


Invasive Species

Cartographer: Philippe Rekacewicz, UNEP/GRID-Arendal

How the comb-jelly (Mnemiopsis leidyi) is spreading through European seas (invasive species).

The most threatening event for the Caspian ecosystem was the arrival of the North American comb jelly (Mnemiopsis leidyi). It was brought accidentally to the Caspian in the ballast water of oil tankers. Invasive and alien species can exploit ecological niches that are not currently occupied, and spread rapidly, out-competing indigenous species.

Photo: Vidar Aas

Here is one American comb-jelly that made it all the way to Alvern in Akershus, Norway.

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