Record details

Title
    The muddy bottom of Lake Pannon - a challenge for dreissenid settlement (Late Miocene; Bivalvia)
Statement of responsibility
    Mathias Hazhauer, Oleg Mandic
Author
    Hazhauer, Mathias
    Mandic, Oleg
Language
    anglicky
Source title - serial
    Palaeogeography, palaeoclimatology, palaeoecology
Vol./nr.
    Vol. 204, no. 3-4
Pages
    p. 331-352
Year
    2004
Notes
    9 obr., 4 fot.
    Bibliografie na s. 350-352
    il.
    Zkr. název ser.: Palaeogeogr. Palaeoclimatol. Palaeoecol.
Classfication no.
    551.7
Conspectus category
    55
Subject group
    bahno
    Bivalvia
    lumachela
    miocén-svrchní
    paleobiogeografie
    paleobiologie
    paleoekologie
    paleolimnologie
    pannon
    Paratethys
    profil odkryvu
    pyrit
    schránky
    sedimenty jezerní
    sirovodík
    stratigrafie sekvenční
    taxon endemický
    terciér
    vídeňská pánev
    zóny biostratigrafické
Geographical name
    Bosna a Hercegovina
    Chorvatsko
    ČR-Morava
    Hodonín
    Maďarsko
    Rakousko-Niederösterreich
    Rumunsko
    Slovensko
    Srbsko
Keyword
    Bivalvia
    Bottom
    Challenge
    Dreissenid
    Lake
    Late
    Miocene
    Muddy
    Pannon
    Settlement
Abstract (in english)
   The Late Miocene dreissenids of Lake Pannon - a long existing eastern-central European lake - bear witness to two very different modes of life, which allowed these bivalves to successfully settle in what appears to be an inhospitable environment. One guild is restricted to the genera Mytilopsis Conrad, 1858 and Sinucongeria Lorenthey, 1894. These representatives are extreme r-strategists which tend to produce temporal boom-and-bust populations during 'time windows' of improved ecological conditions. These opportunities are interpreted here to correlate with cyclic shift in the epilimnion/hypolimnion relation and the corresponding oxygenation of bottom waters, events which are probably triggered by low-frequency orbital forcing. The second guild is composed solely of Congeria Partsch, 1836.
   The paradox of the proliferation of a single species, characterised by extreme size and weight, in a muddy, oxygen-deficient lake environment avoided by nearly all other molluscs points to a 'hidden' mechanism not accessible to other species. We tentatively link this mechanism with chemosymbiosis. Functional morphology in interplay with a highly sulphidic, over-saturated interstitial water support an interpretation of the large Congeria subglobosa as a successful 'H2S pump' model
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    31. 3. 2008
Import date
    8. 8. 2012