A niche is a term describing the functional position of a species in its ecosystem. In nature there are predators and preys, generalist and specialist species, key species and so on. An invasive species is an exotic species that adversely affect the habitats they invade economically, environmentally or/and ecologically. Here you can find a good example in São Miguel Island (the Açores, Portugal).
On the other hand, on both sides of the commercial streets of most occidental cities, there are plenty of different niches. There is a niche filled by big book stores like Borders (US), Waterstones (UK) or La Casa del Libro (Spain). But it is possible as well observe McDonalds, IKEA or Zara everywhere. Because of Globalization, these sort of stores and restaurants are invading our urban ecosystems.
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