1. Clinal variation or validation of a subspecies? A case study of the Graptemys nigrinoda complex (Testudines: Emydidae). (12th March 2014) Authors: Ennen, Joshua R.; Kalis, Marley E.; Patterson, Adam L.; Kreiser, Brian R.; Lovich, Jeffrey E.; Godwin, James; Qualls, Carl P. Journal: Biological journal of the Linnean Society Issue: Volume 111:Number 4(2014:Apr.) Page Start: 810 Record Type: Journal Article View Content: Available online (eLD content is only available in our Reading Rooms) ↗