been settling in European inland waters. According
to a recent inventory, 296 species of invertebrate
and 136 fish species found in Europe's freshwater
environment are alien. An increase in the numbers
of alien animal species in European inland waters
has been particularly evident in the period since the
Second World War (DAISIE, 2009). Globalization and
climate change are projected to increase these aquatic
'bioinvasions' and reduce environmental resistance
to organism groups that are adapted to higher
temperatures (Galil et al., 2007).