MIS 5–1 dinoflagellate cyst analyses and morphometric evaluation of Galeacysta etrusca and Spiniferites cruciformis in southwestern Black Sea

Autor: P.J. Mudie, Shannon Ferguson, Sophie Warny, Gilles Escarguel
Přispěvatelé: Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803, USA, Museum of Natural Science, Louisiana State University, Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés ( LEHNA ), Institut National de la Recherche Agronomique ( INRA ) -Centre National de la Recherche Scientifique ( CNRS ) -École Nationale des Travaux Publics de l'État ( ENTPE ) -Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon, Geological Survey Canada Atlantic, Dartmouth, Nova Scotia, Louisiana State University (LSU), Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS), Geological Survey Canada, Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE), Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL)
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: Quaternary International
Quaternary International, Elsevier, 2018, 465, pp.117-129. 〈10.1016/j.quaint.2016.07.035〉
Quaternary International, Elsevier, 2018, 465, pp.117-129. ⟨10.1016/j.quaint.2016.07.035⟩
ISSN: 1040-6182
DOI: 10.1016/j.quaint.2016.07.035〉
Popis: International audience; Here we evaluate the changes in dinoflagellate cyst assemblages and intraspecies morphometric vari- ability in dominant Black Sea species during MIS 5␣1 in sediment recovered from DSDP Site 380. Twenty-three taxa represent the majority of the 16,000 cysts tabulated. Qualitative assessment of assemblage composition indicates that the taxa are distributed in three ecological assemblages; marine stenohaline, marine euryhaline, and brackish Ponto-Caspian endemic species; the fluctuation of these assemblages provide evidence for changes in environmental conditions from the end of MIS 5e to MIS 1. Although some fluctuations in sea-surface salinity are highlighted by changes in dinoflagellate assem- blages, the continuous presence of Pyxidinopsis psilata, Galeacysta etrusca and Spiniferites cruciformis likely indicate brackish conditions for most of the interval sampled at this site. Statistical analysis of measured morphometric changes in Galeacysta etrusca endocyst:ectocyst ratios indicate that the spec- imens recovered mostly belong to a smaller morphotype forming group ‘b’ of Popescu et al. (2009), interpreted as indicative of brackishemarine conditions after migration to the Mediterranean from the Paratethys. Although not fully conclusive because of sampling constraints and limited chronological control, the lack of sudden, large abundance changes in marine salinity-tolerant species the relatively low species diversity, and the sequence of sapropelic layers relative to banded clastic muds provides evidence against the occurrence of sustained marine flooding between ca. 0.07e0.007 Ma and it is not clear that the last interglacial marine highstand during MIS 5e was fully sampled at this site.
Databáze: OpenAIRE
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