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SUMMARY:Phanerozoic phytoplankton\, marine biodiversity\, pCO2\, tectonic 
 and climatic cycles
DTSTART:20151020T120000
DTEND:20151020T130000
DTSTAMP:20260929T002422Z
UID:9c3290844ca10e73b1fc4ec84e5f4b024b4995bed5a994379a7c52e7
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Thomas Servais\, CNRS-UMR 8198 Evo-Eco Paleo\, Université 
 de Lille\, France\nAbstract:\nThe modern oceans display three major groups
  of marine phytoplankton: the calcareous (coccolithophores\, etc.)\, silic
 eous (diatoms\, etc.) and organic-walled (dinoflagellates\, etc.) phytopla
 nkton. The fossil record indicates that elements of the organic-walled mic
 rophytoplankton were most probably present in the oceans since the Precamb
 rian. However\, the presence of calcareous and siliceous phytoplankton in 
 the Precambrian and Palaeozoic is not clearly established\, coccolithophor
 ids and diatoms only appear in the fossil record in the early Mesozoic. No
 netheless\, the Palaeozoic fossil record of the acritarchs can be used as 
 a proxy for the larger marine organic-walled microplankton (> 20 µm)\, th
 e smaller fractions of the phytoplankton\, the picoplankton and the bacter
 ioplankton having usually not been documented.\nThe diversity changes of t
 he Phanerozoic phytoplankton indicate some major palaeoecological trends a
 nd allow us to redraw partly the evolution of the marine phytoplankton fro
 m the Cambrian to the Present. Here we attempt to correlate the Phanerozoi
 c phytoplankton with the global marine palaeobiodiversity\, pCO2\, as well
  as tectonic and climatic cycles\, focusing on the Cambrian-Ordovician rad
 iation (including the ‘Ordovician plankton revolution’)\, the ‘Late 
 Palaeozoic phytoplankton blackout’\, and the ‘Mesozoic radiation.'Shor
 t biography:\nThomas Servais is a research director at the French Centre o
 f Scientific Research (CNRS) at the University of Lille\, France. He was t
 rained as a geologist at the universities of Namur and Liège in Belgium\,
  where he received a PhD on the study of Ordovician acritarchs (organic-wa
 lled phytoplankton). After postdoctoral studies in Belgium\, Germany and t
 he United Kingdom\, he was recruited as a CNRS research associate at the U
 niversity of Lille\, where he successively directed the research units (UM
 R) of palaeontology and geology. Most of his research concentrates on Lowe
 r Palaeozoic microphytoplankton\, but other fields of interest include reg
 ional geology\, macro- and micropalaeontology. He has been President of th
 e Association de Palynologues de Langue Française (APLF)\, President of t
 he Association Paléontologique Française (APF)\, Vice President of the P
 alaeontological Association and leader of the International Geoscience Pro
 gramme (IGCP) project no. 503 “Ordovician Palaeogeography and Palaeoclim
 ater”. He is currently past-President of the International Federation of
  Palynological Societies (IFPS) and Vice President of the Paleontological 
 Association.
LOCATION:GR C0 01 (NEW) http://plan.epfl.ch/?room=GR%20C0%2001
STATUS:CONFIRMED
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