posted on Jul, 7 2011 @ 04:15 AM
reply to post by Johnze
See, the thing isn't that "all the rainforest is being cut down."
It's a patch here, a patch there, a patch over yonder. It rather resembles an M.C. Escher checkerboard. There are lots of trees left, but there's a
problem...
A forest ecosystem like this cannot exist in patchwork. Each patch basically becomes an island; the underlying soil is exceptionally poor once the
organic layer is gone through,and you end up with claypan. The plants cannot spread through this. Each individual patch is too small to support most
larger animals, resulting in either migrations to more solid areas (for creatures such as jaguars or coatimundis that are highly mobile) or, well,
just dying out (creatures such as sloths or several varieties of monkey who cannot or will not cross the bare ground)
The open area also has a large drying effecft - the plants and soil are exposed to more wind and sunlight, and retain less water. A good many of these
plants cannot tolerate dry, sunny conditions, being adapted to moist, dim understory conditions. They die, the patch of forest they're in shrinks
that much more.
Basically you can't chop it up into squares and patches and claim "hey, there's still rainforest!" because there's not. You end up with a few
clumps of dying trees in islands of diminising diversity.