Vicarious living: Pliocene menardellids between an isthmus and an ice sheet

Research Article| December 01, 2003 Vicarious living: Pliocene menardellids between an isthmus and an ice sheet W.P. Chaisson W.P. Chaisson 1Department of Earth and Environmental Sciences, University of Rochester, Rochester, New York 14627, USA Search for other works by this author on: GSW Google Scholar Author and Article Information W.P. Chaisson 1Department of Earth and Environmental Sciences, University of Rochester, Rochester, New York 14627, USA Publisher: Geological Society of America Received: 15 May 2003 Revision Received: 13 Aug 2003 Accepted: 14 Aug 2003 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2003) 31 (12): 1085–1088. https://doi.org/10.1130/G19834.1 Article history Received: 15 May 2003 Revision Received: 13 Aug 2003 Accepted: 14 Aug 2003 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation W.P. Chaisson; Vicarious living: Pliocene menardellids between an isthmus and an ice sheet. Geology 2003;; 31 (12): 1085–1088. doi: https://doi.org/10.1130/G19834.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Biostratigraphic and isotopic studies of planktic foraminifera suggest that early to middle Pliocene closure of the Central American Seaway caused vicariant speciation among previously cosmopolitan menardellid foraminifera. New morphospecies were restricted to the tropical Atlantic. Isotopic data suggest that newly evolved Atlantic menardellids were adapted to more oligotrophic conditions, living higher in the water column than ancestral forms and perhaps harboring photosymbionts. In the late Pliocene, all but one menardellid morphospecies became extinct. These extinctions coincided with a progressive increase in the amplitude of periodic climatic change and the end of isolated tropical Atlantic surface circulation as Northern Hemisphere glaciation intensified. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.