genetic variation

Levin, D.A., K. Ritter, and N.C. Ellstrand. 1979. Protein polymorphism in the narrow endemic Oenothera organensis. Evolution 33(2): 534-542.

Busch, J. D, M. P. Miller, E. H. Paxton, M. K. Sogge, and P. Keim. 2000. Genetic variation in the endangered southwestern willow flycatcher. The Auk. 117(3):586-595.

• Southwestern Willow Flycatcher
• Empidonax traillii extimus
• genetic variation