Before revision: An ecological island is not necessarily an island surrounded by water, but is an area of land , isolated by natural or artificial means from the surrounding land, where a natural micro-habitat exists amidst a larger differing ecosystem.
After revision: An ecological island is a term used in New Zealand, and increaingly in Australia, to refer to an area of land (not necessarily an actual island) isolated by natural or artificial means from the surrounding land, where a natural micro-habitat exists amidst a larger differing ecosystem.