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      Data report: late Pliocene to early Quaternary calcareous nannofossils, IODP Expedition 323 Site U1341, Bering Sea

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      Proceedings of the IODP
      Integrated Ocean Drilling Program

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          Abstract

          We performed semiquantitative analyses of late Pliocene–early Quaternary calcareous nannofossil assemblages in samples from Hole U1341B, recovered on the Bowers submarine ridge during Integrated Ocean Drilling Program Expedition 323 to the Bering Sea (July–September 2009). The record is characterized by very low abundances and frequent barren intervals, which have hampered our attempts of locating standard and high-latitude calcareous nannofossil biostratigraphic events. However, we have narrowed a horizon in which noted changes in the assemblage composition can be correlated to other records in the North Pacific.

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          Most cited references13

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          Supplementary modification and introduction of code numbers to the low-latitude coccolith biostratigraphic zonation (Bukry, 1973; 1975)

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            Pseudo-cryptic speciation in coccolithophores.

            Coccolithophores are a group of calcifying unicellular algae that constitute a major fraction of oceanic primary productivity, play an important role in the global carbon cycle, and are key biostratigraphic marker fossils. Their taxonomy is primarily based on the morphology of the minute calcite plates, or coccoliths, covering the cell. These are diverse and include widespread fine scale variation, of which the biological/taxonomic significance is unknown. Do they represent phenotypic plasticity, genetic polymorphisms, or species-specific characters? Our research on five commonly occurring coccolithophores supports the hypothesis that such variation represents pseudocryptic speciation events, occurring between 0.3 and 12.9 million years ago from a molecular clock estimation. This finding suggests strong stabilizing selection acting on coccolithophorid phenotypes. Our results also provide strong support for the use of fine scale morphological characters of coccoliths in the fossil record to improve biostratigraphic resolution and paleoceanographic data retrieval.
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              Revised Technique for Calculation of Calcareous Nannofossil Accumulation Rates

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                Author and article information

                Journal
                10.2204/iodp.proc.323.2011
                Proceedings of the IODP
                Integrated Ocean Drilling Program
                1930-1014
                21 June 2013
                Article
                10.2204/iodp.proc.323.201.2013
                fb4da9c8-cf8e-4d8c-9bf8-a14f5084d9ef

                This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

                History

                Earth & Environmental sciences,Oceanography & Hydrology,Geophysics,Chemistry,Geosciences

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