DOI: 10.1016/j.palaeo.2016.02.052
论文题名: Multi-proxy palaeoecological responses to water-level fluctuations in three shallow Turkish lakes
作者: Levi E.E. ; Bezirci G. ; Çakiroğlu A.T. ; Turner S. ; Bennion H. ; Kernan M. ; Jeppesen E. ; Beklioğlu M.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 449 起始页码: 553
结束页码: 566
语种: 英语
英文关键词: Cladocera sub-fossil
; Diatom sub-fossil
; Mediterranean
; Pigment
; Plant macrofossil
; Sediment geochemistry
英文摘要: Natural or human-induced water-level fluctuations influence the structure and function of shallow lakes, especially in semi-arid to arid climate regions. In order to reliably interpret the effect of water-level changes from sedimentary remains in the absence of historical data, it is crucial to understand the variation in sedimentary proxies in relation to water level measurements. Here, we took advantage of existing water surface elevation data on three large shallow lakes in Turkey to elucidate the impact of lake-level changes on benthic-pelagic primary production over the last 50-100 years. Sub-fossil cladocerans, diatoms, plant remains and pigments were investigated as biological variables; X-ray fluorescence (XRF) and loss on ignition (LOI) analyses were conducted as geochemical-physical variables on a set of 210Pb and 137Cs dated cores. Dating of the cores were robust, with the exception of uncertainties in Lake Marmara littoral core due to low unsupported 210Pb activities and high counting errors. Results indicated that Lake Marmara was dominated by benthic species throughout the sediment record, while Lakes Beyşehir and Uluabat shifted from a littoral-dominated system to one with increased pelagic species abundance. In all cores there was a stronger response to longer-term (decadal) and pronounced water-level changes than to short-term (annual-biennial) and subtle changes. It was also noted that degree of alteration in proxies differed between lakes, through time and among pelagic-littoral areas, likely emphasising differences in depositional environments and/or resolution of sampling and effects of other stressors such as eutrophication. Our results highlight lake-specific changes associated with water-level fluctuations, difficulties of conducting studies at required resolution in lakes with rather mixed sediment records and complexity of palaeolimnological studies covering recent periods where multiple drivers are in force. They further emphasise the need to include instrumental records when interpreting effects of recent water-level changes from sediment core data in large shallow lakes. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68463
Appears in Collections: 过去全球变化的重建
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作者单位: Limnology Laboratory, Biological Sciences Department, Middle East Technical University, Ankara, Turkey; Environmental Change Research Centre, University College London, Pearson Building, Gower Street, London, United Kingdom; Department of Bioscience, Aarhus University, Vejlsøvej 25, Silkeborg, Denmark; Sino-Danish Centre for Education and Research (SDC), Beijing, China; Arctic Research Center (ARC), Aarhus University, Building 1110, C. F. Møllers Alle 8, Aarhus, Denmark; Kemal Kurdaş Ecological Research and Training Stations, Lake Eymir, Middle East Technical University, Oran Mahallesi, Çankaya, Ankara, Turkey
Recommended Citation:
Levi E.E.,Bezirci G.,Çakiroğlu A.T.,et al. Multi-proxy palaeoecological responses to water-level fluctuations in three shallow Turkish lakes[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,449