Geometric Morphometric Analysis of Patterns of Shape Change in the Ordovician Brachiopod Sowerbyella

Abstract

Other| April 01, 2001 Geometric Morphometric Analysis of Patterns of Shape Change in the Ordovician Brachiopod Sowerbyella ROBERT A. HANEY; ROBERT A. HANEY 1Department of Geological Sciences, State University of New York at Buffalo, Amherst, NY 14260 Search for other works by this author on: GSW Google Scholar CHARLES E. MITCHELL; CHARLES E. MITCHELL 1Department of Geological Sciences, State University of New York at Buffalo, Amherst, NY 14260 Search for other works by this author on: GSW Google Scholar KEONHO KIM KEONHO KIM 1Department of Geological Sciences, State University of New York at Buffalo, Amherst, NY 14260 Search for other works by this author on: GSW Google Scholar PALAIOS (2001) 16 (2): 115–125. https://doi.org/10.1669/0883-1351(2001)016<0115:GMAOPO>2.0.CO;2 Article history accepted: 29 Oct 2000 first online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation ROBERT A. HANEY, CHARLES E. MITCHELL, KEONHO KIM; Geometric Morphometric Analysis of Patterns of Shape Change in the Ordovician Brachiopod Sowerbyella. PALAIOS 2001;; 16 (2): 115–125. doi: https://doi.org/10.1669/0883-1351(2001)016<0115:GMAOPO>2.0.CO;2 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 SocietyPALAIOS Search Advanced Search Abstract The brachiopod genus Sowerbyella is an abundant component of many Ordovician paleocommunities of the eastern United States. Five successive populations from a limited geographic region in central Kentucky were tested for the response of brachial valve size and shape to alterations in paleoenvironmental conditions. The populations span the interval from Chatfieldian to Maysvillian (M5-C3), including the majority of an Ecological-Evolutionary (EE) subunit previously described for brachiopods in this area. A marked diminution in size occurs subsequent to maximum deepening in the M5 sequence, and is persistent for the remainder of the interval sampled. Shape follows a different pattern, with similar changes occurring each time deep-water facies occur in the area. Discriminant analysis shows a clear separation between populations sampled from nearshore and offshore facies along discriminant function 1. End member populations in both nearshore and offshore populations diverge significantly on discriminant function 2 over periods of 6.5 and 3.5 my, respectively, the longer period spanning the majority of the EE subunit. This contrasts with stasis in valve shape in Devonian brachiopods over an EE subunit of similar duration, but is in accordance with previous findings of less community-level stability in Ordovician EE subunits when compared with their Devonian counterparts. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.