Abstract
Colonies of pocket gophers (Geomys pinetis pinetis) in the St. Johns River basin of eastern peninsular Florida occur in uplands which generally correspond to islands emergent from the Pamlico Sea of the latest Sangamonian interglacial. The uplands presently occupied by G. pinetis are isolated by intervening unsuitable habitats and by the St. Johns River. Cranial morphometrics were used to evaluate the pattern of geographic variation among populations of modern G. pinetis in the St. Johns River basin and to examine the influence of the river as a dispersal barrier. Significant variation was found among samples on the E side, the W side, and on opposite sides of the St. Johns River. Results are interpreted in light of historical biogeography of the Quaternary Period; the distribution of pocket gophers in peninsular Florida has been significantly affected by changes in eustatic sea level.
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