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Titolo:
Species richness and abundance patterns of Tethyan Cretaceous rudist bivalves (Mollusca : Hippuritacea) in the central-eastern Mediterranean and Middle East, analysed from a palaeontological database
Autore:
Steuber, T; Loser, H;
Indirizzi:
Ruhr Univ Bochum, Inst Geol Mineral & Geophys, D-44801 Bochum, Germany Ruhr Univ Bochum Bochum Germany D-44801 Geophys, D-44801 Bochum, Germany Staatliches Museum Mineral & Geol, D-01109 Dresden, Germany Staatliches Museum Mineral & Geol Dresden Germany D-01109 esden, Germany
Titolo Testata:
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
fascicolo: 1-2, volume: 162, anno: 2000,
pagine: 75 - 104
SICI:
0031-0182(20000915)162:1-2<75:SRAAPO>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
JEBEL-AKHDAR SULTANATE; SEA-LEVEL RISE; CARBONATE PLATFORM; APTIAN CARBONATES; ANOXIC EVENTS; STRATIGRAPHY; EVOLUTION; OMAN; GROWTH; MARGIN;
Keywords:
cretaceous; palaeobiogeography; palaeontological database; rudists; species richness;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
119
Recensione:
Indirizzi per estratti:
Indirizzo: Steuber, T Ruhr Univ Bochum, Inst Geol Mineral & Geophys, D-44801 Bochum, Germany Ruhr Univ Bochum Bochum Germany D-44801 44801 Bochum, Germany
Citazione:
T. Steuber e H. Loser, "Species richness and abundance patterns of Tethyan Cretaceous rudist bivalves (Mollusca : Hippuritacea) in the central-eastern Mediterranean and Middle East, analysed from a palaeontological database", PALAEOGEO P, 162(1-2), 2000, pp. 75-104

Abstract

Data about the stratigraphical and regional distribution of Cretaceous rudist bivalves in the central-eastern Mediterranean and Middle East from the Barremian to the Maastrichtian have been compiled in a taxonomic databank system. The investigated region comprises northern, central and southern regions of the Cretaceous Tethys. The regionally different quality of taxonomic data is critically discussed. Both species richness and abundance (numberof species records) peak in the Early Aptian, Late Cenomanian and Early Campanian. Temporal patterns in species richness are examined in relation to evolutionary innovations of the group. Crises in species richness and abundance during the Early and mid-Cretaceous were coeval with oceanic anoxia associated with platform drowning. Also, regional emergence affected large parts of the Apulian Plate and other central Tethyan carbonate platforms during the mid-Cretaceous period of globally high sea level, so that these crises can be attributed to regional environmental perturbations, induced by either oceanic anoxia or tectonic movements. The Cenomanian-Turonian transition marks an important faunal turnover, as indicated by the demise of taxonomic groups which are characterised by recumbent ecological morphotypes and predominantly aragonitic shells. During the Turonian; they were replaced byassociations of largely calcitic Radiolitidae and Hippuritidae, among which elevator morphotypes dominated. The stratigraphy of many post-Turonian deposits in the studied region is too imprecise for a detailed analysis of Late Cretaceous distributional patterns, and the demise of rudists during theMaastrichtian in particular. The regional pattern of species richness and abundance is similar throughout most of the investigated region. A notable exception is the broad north-eastern African shelf from Libya to Lebanon, where rudists were almost completely absent after the Coniacian, This coincided with shallow-water phosphorite and black-shale formation on the extended shelf of this region, indicating the upwelling of nutrient-rich waters and stagnant conditions. During this time (Campanian-Maastrichtian), species-rich associations thrived along the north-eastern Afro-Arabian margin, now exposed in south-eastern Turkey, Iran, the United Arab Emirates and Oman. This region forms the single distinct faunal province during the Cretaceous in the studied region, as indicated by an endemism of 40% at the genus level. The low species richness and abundance of Hippuritidae on Turonian-Maastrichtian central Tethyan carbonate platforms, when compared with regions having mixed calcareous-siliciclastic sedimentation, is interpreted to argue against a widespread photosymbiosis in the group. Several aspects of this study highlight the importance of regional tectonic and oceanographic controls of distributional, and perhaps also evolutionary, patterns of rudist bivalves. Their delineation still suffers from the regionally different quality of stratigraphical and taxonomic data. (C) 2000 Elsevier Science B.V. Allrights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 16:51:00