By Dr Colin Lawton, National University of Ireland Galway
One of the greatest threats to biodiversity is the invasion of alien species into an ecosystem. These can occur through natural migrations as a result of recent habitat or climate change, or species can be introduced by human activities, both accidentally or deliberately. Invasions are occurring at an increasing rate as a result of faster environmental change and increased movement by human populations.
Like all countries, Ireland has experienced a number of mammal invasions in recent decades. Species such as the grey squirrel, greater white toothed shrew, bank voles and American mink have all become established, and in each case the opportunity to eradicate the animal and stop the invasion has long gone. Continue reading