Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Coalescence trees of the ten major clusters of Rana pipiens in North Dakota based on the Beaumont (a) and Cornuet–Miller (b) models. Both models show the major split between the populations east and west of the Missouri River occurred during the late Pleistocene (18–13 kya), while most of the subdivision within these major populations occurring during the dry period of the Holocene (11–7 kya)
