Image from dailymail.co.uk
A beautiful example of semi-isolated ecosystems are the Tepuis of northern South America (see photo example above). Tepuis are remnants of an ancient plain that was uplifted evenly by tectonic forces, then eroded away at the edges, leaving isolated wooded mesas behind. Surrounded by tropical forest, but jutting up to a mile into the sky, the flatlands topping the cliffs experience a cool moist climate and are home to unique species. Looking to the distant future, the same erosive forces that made them will ultimately eliminate them.
We finished the meeting with a video from National Geographic about a scientist and a team of assistants who traveled to a Tepui by helicopter to collect samples of a rare tree toad: