Record details

Title
    Distribution paléogéographique des mollusques bivalves durant l´Ordovicien
Statement of responsibility
    Teresa M. Sánchez, Claude Babin
Other titles
    Palaeogeographical distribution of bivalve molluscs during the Ordovician
Author
    Babin, Claude
    Sánchez, Teresa M.
Language
    francouzsky
Source title - serial
    Geodiversitas
Vol./nr.
    An. 25, no. 2
Pages
    p. 243-259
Year
    2003
Notes
    3 obr., 4 tab., 26 bibl.
    Anglické resumé
    il.
    Zkr. název ser.: Geodiversitas (Paris).
Subject group
    analýza statistická
    Bivalvia
    Mollusca
    ordovik
    paleobiogeografie
    paleoekologie
Geographical name
    Afghánistán
    Amerika severní
    Argentina
    Austrálie
    Bolívie
    ČR-Čechy
    Estonsko
    Evropa severní
    Francie
    Irsko
    Kazachstán
    Maroko
    Rusko-Sibiř
    Španělsko
Keyword
    Bivalves
    Distribution
    Durant
    L´Ordovicien
    Mollusques
    Paléogéographique
Abstract (in english)
   Palaeogeographical distribution of bivalve molluscs during the Ordovician. Data from 19 localities throughout the world yielding bivalves were analysed by means of cluster analysis. Due to the uncertainty about the completeness of the fossil record, genera restricted to a single locality at each of the three selected time intervals (Early, Middle, and Late Ordovician) were considered "exclusive" instead of "endemic". Results show very low similarity values, inclusive among localities belonging to the same biochore based on other marine benthic organisms (i.e. brachiopods). Moreover, the percentage of "exclusive" genera per locality is always very high at any time interval. Since the Early Palaeozoic bivalves are not biostratigraphically important, their real diversity has probably been underestimated. As a result, even if understanding of them has strongly increased in the last years, it is not still enough to give us an accurate picture of their generic distribution in space and time.
   
   However, the incompleteness of the fossil record itself does not explain this pattern of distribution. Most important factors could be related to biotic factors, such as the stenotopic nature of most of the shallow dwelling species, and the probably short-lived pelagic larval stage. The low percentage of shared genera among different localities seems to preclude the use of bivalves as relevant palaeobiogeographic indicators during the Ordovician
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    26. 9. 2007
Import date
    8. 8. 2012