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Good afternoon and welcome to the Zoology Department. We’re going to consider the effect of introduced species in New Zealand. I’d like to start with a quick look at ancient history. New Zealand is a tiny fragment of the ancient continent of Gondwanaland. Our diverse flora comes from two sources: first, the ancient species present when this country was still part of Gondwanaland, and the second, species which arrived after separation. The vegetation developed without browsing mammals. However, since human settlement, there has been considerable destruction or alteration of the landscape through fire and the introduction of mammals and foreign plants.
There were three major invasions by humans. First, were the Polynesians and they brought with them the ’kuri’ dog and the ’kiore’ rat. Much later, Captain Cook arrived followed by European sealers and whalers. European rats and mice came aboard their ships. Finally, European settlers started arriving from the 1840s onwards introducing all manner of birds, animals and plants into the still fairly pristine environment. Some species were introduced from Australia but most came from the British Isles and Europe.