A two-step expansion of the dinocyst Lingulodinium machaerophorum in the Caspian Sea: the role of changing environment

QUATERNARY SCIENCE REVIEWS

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Article

Leroy, S. A. G.¹  Lahijani, H. A. K.²  Reyss, J. -L.³  Chalie, F.⁴  Haghani, S.^1,2,5  Shah-Hosseini, M.^2,4  Shahkarami, S.^2,5  Tudryn, A.⁶  Arpe, K.^1,7  Habibi, P.²  Nasrollahzadeh, H. S.⁸  Makhlough, A.⁸ 

[1] Brunel Univ, Inst Environm, Uxbridge UB8 3PH, Middx, England

[2] Iranian Natl Inst Oceanog, Tehran 1411813389, Iran

[3] CEA, CNRS, Lab Sci Climat & Environm, F-91198 Gif Sur Yvette, France

[4] Aix Marseille Univ, CEREGE, CNRS UMR 7330, UM34, F-13545 Aix En Provence 04, France

[5] Univ Tehran, Sch Geol, Tehran, Iran

[6] Univ Paris 11, Lab CNRS UPS UMR 8148, IDES, Dept Sci Terre, F-91405 Orsay, France

[7] Max Planck Inst Meteorol, D-20146 Hamburg, Germany

[8] Caspian Sea Ecol Res Ctr, Dept Ecol, Sari 961, Iran

关键词: Caspian Sea;    Dinocysts;    Past sea surface temperature;    Last centuries;    Last millennia;   

DOI  :  10.1016/j.quascirev.2013.06.026

来源: Elsevier

【 摘 要 】

Dinoflagellate cyst assemblages were analysed in four short sediment cores collected in the south Basin of the Caspian Sea for assessing environmental changes over the last few millennia. Two of these cores were dated by radionuclides. The sedimentation rate of one of them was very high, in the order of 20 mm per year. The interpretation of the four sequences is supported by a collection of 27 lagoonal or marine surface sediment samples. A sharp increase in the concentration of the dinocyst occurs after 1967, especially owing to Lingulodinium machaerophorum. Considering nine other cores covering parts or the whole of Holocene, it became clear that this species started to develop in the Caspian Sea only during the last three millennia. By analysing instrumental data and collating existing reconstructions of sea level changes over the last decades, we show that the main forcing for the recent increase of L machaerophorum percentages and concentration is global climate change, especially sea surface temperature increase. Sea level fluctuations likely only have a minor impact. We argue that the recent increase in L machaerophorum indicates that the Caspian Sea clearly is in the Anthropocene. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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