Phytoplankton dynamics from the Cambrian Explosion to the onset of the Great Ordovician Biodiversification Event: a review of Cambrian acritarch diversity

摘要: Most early Palaeozoic acritarchs are thought to represent a part of the marine phytoplankton and so constituted significant element at base trophic chain during ‘Cambrian Explosion’ subsequent ‘Great Ordovician Biodiversification Event.’ Cambrian acritarch occurrences have been recorded in great number studies. In this paper, published data on assembled order reconstruct taxonomic diversity trends that can be compared with biodiversity invertebrates. We compile database calculate various indices global regional (i.e. Gondwana or Baltica) scales. The stratigraphic bins applied level ten stages, fourteen commonly used biozones somewhat higher resolved scheme. Our results show marked differences between palaeogeographical regions. They also indicate limitations potential sampling bias, as species significantly correlated studies per bin. total normalized diversities genera not affected same way. genus curves slow but irregular rise over course Cambrian. These least biased. A radiation lesser extent ‘lower’ Series 2 appears mirror metazoans. This radiation, evident Gondwana, is followed by prominent low upper 3 lower Furongian. Highest reached globally, both Baltica uppermost Stage 10, more precisely Peltura trilobite Zone, preceding substantial phase extinction below Cambrian/Ordovician boundary. Nearly all present 10 survived into Ordovician. forms emerged therefore became foundation for rapid Event’.