Travel from the tropics to the poles, and you'll notice that the diversity of mammals declines with distance from the equator. Move from lowland to mountains, and you'll see diversity increase as the ...
Life on Earth is amazingly diverse, and exhibits striking geographical global patterns in biodiversity. A pair of companion papers reveal that mountain regions -- especially those in the tropics -- ...
Layered mountain ridges stretch across the Pamir Mountains, Tajikistan. Erosion lines shape the surface clearly. This view hints at long geological processes. Killers without a cause: The rise in ...