Life Distribution in Deep Canyons

Biogeography is the distribution of life within and around landforms. In a large deep canyon, that distribution is influenced by the elevation and the aspect of a slope which also controls the sunlight received. We talk with Larry Stevens of the Museum of Northern Arizona about his decades long investigation of biogeography within the Grand Canyon. More than 70% of the species found in the Grand Canyon are genetically affected by the landform itself and many can live nowhere else.