Sky Island
Sky islands are mountains that are isolated by surrounding lowlands of a dramatically different environment, a situation which, in combination with the altitudinal zonation of ecosystems, has significant implications for natural habitats. Endemism, vertical migration, and relict populations are some of the natural phenomena to be found on sky islands.
The complex dynamics of species richness on sky islands draws attention from the discipline of biogeography, and likewise the biodiversity is of concern to conservation biology. One of the key elements of a sky island is separation by sheer physical distance from the other mountain ranges, resulting in a habitat island, such as a forest surrounded by desert.
Some sky islands serve as refugia for boreal species stranded by warming climates since the last ice age. In other cases, localized populations of plants and animals tend towards speciation, the same process that happens on oceanic islands such as the Galápagos Islands.
Read more about Sky Island: Origin of The Term, Characteristics
Famous quotes containing the words sky and/or island:
“The sky is the daily bread of the eyes.”
—Ralph Waldo Emerson (1803–1882)
“I ... would rather be in dependance on Great Britain, properly limited, than on any nation upon earth, or than on no nation. But I am one of those too who rather than submit to the right of legislating for us assumed by the British parliament, and which late experience has shewn they will so cruelly exercise, would lend my hand to sink the whole island in the ocean.”
—Thomas Jefferson (1743–1826)