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Origin, migration pathways, and paleoenvironmental significance of Holocene ostracod records from the northeastern Black Sea shelf

Published online by Cambridge University Press:  12 January 2017

Maria A. Zenina ,
Elena V. Ivanova ,
Lee R. Bradley ,
Ivar O. Murdmaa ,
Eugene I. Schornikov  and
Fabienne Marret
Maria A. Zenina*
Affiliation:
P.P. Shirshov Institute of Oceanology, Russian Academy of Science, 36 Nakhimovsky Prospect, Moscow 117997, Russia
Elena V. Ivanova
Affiliation:
P.P. Shirshov Institute of Oceanology, Russian Academy of Science, 36 Nakhimovsky Prospect, Moscow 117997, Russia
Lee R. Bradley
Affiliation:
School of Science and Environment, Manchester Metropolitan University, Manchester M1 5GD, United Kingdom
Ivar O. Murdmaa
Affiliation:
P.P. Shirshov Institute of Oceanology, Russian Academy of Science, 36 Nakhimovsky Prospect, Moscow 117997, Russia
Eugene I. Schornikov
Affiliation:
A.V. Zhirmunsky Institute of Marine Biology, National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Science, 17 Pal’chevsky Street, Vladivostok 690041, Russia
Fabienne Marret
Affiliation:
Department of Geography and Planning, School of Environmental Sciences, University of Liverpool, Liverpool L69 7ZT, United Kingdom
*
*Corresponding author at: P.P. Shirshov Institute of Oceanology, Russian Academy of Science, 36 Nakhimovsky Prospect, Moscow 117997, Russia. E-mail address: maria_zenina@mail.ru (M.A. Zenina)
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Abstract

Micropaleontological studies of the Black Sea, including ostracod records, have suggested that early Holocene salinity values were between ~5 and 10 practical salinity units (psu), contrasting with present values of 18–22 psu. However, more precise paleoenvironmental reconstructions based on ostracod assemblages require additional information related to their modern ecological affinities. This study uses modern species information collected from samples with living fauna to interpret the fossil Holocene assemblages of two sediment cores, Ak-2575 and Ak-521, collected from the northeastern outer shelf of the Black Sea. A total of 37 ostracod species are recorded in the fossil assemblages, with 2 related to freshwater/oligohaline environments, 23 from Caspian-type environments, and 12 from environments similar to the Mediterranean. Three distinct assemblage zones are identified from the Caspian type dominating in the early Holocene up to 7.4 cal ka BP, a mixed assemblage of Caspian type and Mediterranean type from 7.4 to 6.8 cal ka BP, and a progressive dominance of Mediterranean species from 6.8 cal ka BP. It is very likely that the dominant control of ostracod species occurrence during the period up to ~6.8 cal ka BP is salinity. A range of factors including temperature, biotope, and sedimentation rates influenced the species distribution over the last 6.8 cal ka BP.

Keywords

Ostracod assemblagesSalinityBrackish waterMigrationCaspian SeaMediterranean SeaSea of AzovPaleoenvironmentQuaternary
Type
Research Article
Information
Quaternary Research , Volume 87 , Issue 1 , January 2017 , pp. 49 - 65
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2017 

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