Naslov
Endemic brackish-water dinoflagellate cysts from Lake Pannon and the Central Paratethys realm (late Miocene- Pliocene, Central Europe).
(Endemic brackish-water dinoflagellate cysts from Lake Pannon and the Central Paratethys realm (late Miocene-Pliocene, Central Europe).)

Autori
Baranyi, V., Mudie, P.J., Sütő-Szentai, M., Magyar, I., Špelić, M., Bakrač, K

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Abstract Book / - , 2022, 201-201

Skup
11th European Palaeobotany and Palynology Conference

Mjesto i datum
Stockholm, Švedska, 19.06.2022. - 22.06.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
endemic dinoflagellate cysts, Miocene, Pannonian Basin, Spiniferites

Sažetak
Lake Pannon was a large endorheic lake in the Carpathian-Pannonian region during the late Miocene-early Pliocene. The brackish to freshwater conditions of the lake, the prolonged isolation, and geomorphological changes over 8 million years stimulated evolutionary and morphological radiation among gonyaulacacean dinoflagellates after the marine connection to the Mediterranean Sea ceased 11.6 Ma ago. A conspicuous feature of the Pannonian Lake endemism is the very large, probably ecophenotypic variation in the morphology of brackish-water dinoflagellate cysts that challenges taxonomic assignment, and complicates biostratigraphical and palaeoecological interpretations. Furthermore, extensive new research into the Pliocene–Pleistocene geological history of the Ponto-Caspian basins and Mediterranean realm reveal the presence of several gonyaulacacean cysts with morphological affinities to those of Lake Pannon. These cyst taxa appear to have evolved within the isolated Carpathian- Pannonian realm at least five million years before they entered the Ponto-Caspian basins 5–6 million years ago ; hence understanding their taxonomy, origin and ecology has widespread interregional implications. We illustrate selected proximate, chorate to skolochorate Lake Pannon dinoflagellate cyst genera and species to display their morphological variability and to highlight the taxonomical problems that arise from large phenotypical plasticity within species complexes. As a whole, the morphological variation within these endemic dinoflagellate cyst assemblages clearly demonstrate that the cysts growing in low salinity, isolated epicontinental water bodies such as Lake Pannon display greater morphological plasticity than their normal-marine relatives. For a few Lake Pannon species of the genera Spiniferites, Achomosphera, Pyxidinopsis and Pontiadinum, we show how this ecophenotypic variation resulted in a higher level of morphological adaptation, leading to the evolutionary development of new dinoflagellate cyst species. We also show how the taxonomic studies aid in refining the palynostratigraphy of Pannonian Basin sediments.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

POVEZANOST RADA