Papers by Belmecheri Soumaya
Quaternary Science Reviews, 2010
The stable isotope composition of benthic ostracods from a deep-lake sediment core (JO2004-1) rec... more The stable isotope composition of benthic ostracods from a deep-lake sediment core (JO2004-1) recovered from Lake Ohrid (Albania-Macedonia) was studied to investigate regional responses to climate change at the interface between the north-central European and Mediterranean climate systems. Ostracod valves are present only during interglacial intervals, during the Marine Isotope Stage (MIS) 5 and 1. The ostracod oxygen isotope values (d 18 O) quantitatively reflect changes in the oxygen isotope signal of the lake water (d 18 O L ). The interpretation of this record however, is far from straight forward. d 18 O L variations throughout MIS 5/6 transition (TII), MIS 5 and MIS 1 appear to be controlled by site specific hydrological processes as shown by modern isotope hydrology. The d 18 O L trends at TII, MIS 5 and MIS 1 match the timing and the main structural feature of the major regional climate records (Corchia cave d 18 O, Iberian margin Sea Surface Temperature) suggesting that the Ohrid d 18 O L responded to globalscale climate changes, although it seems certain that the lake experienced a significant degree of evaporation and varying moisture availability.
Boreas, 2007
Two new long sediment cores (EC1 and EC3), recovered from different locations within the infilled... more Two new long sediment cores (EC1 and EC3), recovered from different locations within the infilled basin at Les Echets, France, provide a new high-resolution record of terrestrial and lacustrine responses to climatic changes during Marine Isotope Stages (MIS) 3 and 2. The lithologies of the cores are described in detail and correlated with each other by stratigraphic marker horizons, fluctuations in organic matter and AMS radiocarbon ages. The tentative correlation of the new cores to those described and analysed by de Beaulieu et al. (1980) and de Beaulieu & Reille (1984a) provides a preliminary chronostratigraphic framework. Sedimentation during MIS3 started with accumulation of sands and silts and was followed by alternating gyttja and clayey gyttja silts. Exceptionally high sedimentation rates during MIS2 led to the infilling of the basin. Alternating organic-rich and minerogenicrich sediments appear to coincide with changes in pollen assemblages (de Beaulieu & Reille 1984a) and suggest that millennial-scale climatic changes controlled lake productivity and catchment stability during most of MIS3.
Palaeogeography Palaeoclimatology Palaeoecology, 2010
Palaeogeography Palaeoclimatology Palaeoecology, 2009
Lake Ohrid (Albania, Macedonia) is probably the oldest existing lake in Europe and thus of great ... more Lake Ohrid (Albania, Macedonia) is probably the oldest existing lake in Europe and thus of great interest for palaeo-environmental and genetic studies. Within more than 220 endemic faunal species known to live in the lake, ostracods are outstanding due to the potentially very long fossil record. They can provide geochemical information over a period exceeding the entire Quaternary and direct
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Papers by Belmecheri Soumaya