RT Journal Article
T1 Multivariate hierarchical analyses of Early JurassicOstracoda assemblages
A1 Arias Fernández, María del Carmen
A1 Whatley, R.C.
AB Palaeobiogeographic patterns of Early Jurassic ostracods from the northern and southernhemispheres (96 sections located in Europe, North Africa, Western Australia and Northand South America) based on 243 species-level records document global patterns of distributionthat can be compared to those previously published on ostracods from the EuropeanEpicontinental Sea and Tethyan and South Panthalassa areas. All describedrecords of ostracods from both hemispheres spanning the Hettangian to Early Toarcianhave been compiled and verified, and their patterns of origin and distribution have beeninterpreted. Jaccard coefficient of similarity was used to asses similarities among European,American and Tethyan ostracod shelf faunas. The numerical analysis shows a progressivelongitudinal gradient in provincialism through the Early Jurassic, consistentwith the northward drift of Tethyan ostracod faunas towards the European EpicontinentalSea and the southward movement of European taxa into Tethys and Panthalassaoceans. The spread of cosmopolitan species and extinction of endemic species, allied tothe disappearance of geographical barriers, warmer climate conditions and rising sealevels can explain the reduction in ostracod diversity and the east-west provincialismthroughout the Early Jurassic. Interchange between hemispheres, including bipolar distributions,are recognized from the Sinemurian time, pointing out that for most of thestudied period, the climate worldwide was warm and tropical.
PB Taylor & Francis
SN 0024-1164
YR 2009
FD 2009
LK https://hdl.handle.net/20.500.14352/44364
UL https://hdl.handle.net/20.500.14352/44364
LA eng
DS Docta Complutense
RD 7 may 2024