Late quaternary environmental changes in Patagonia as inferred from lacustrine fossil and extant ostracods

摘要: In the present study, we compare modern and Quaternary ostracods from two lacustrine basins: Laguna Cari-Laufquen (41 degrees S) Lago Cardiel (49 in Patagonia. Taxonomic quantitative analyses along with isotopic chemical studies of extant ostracod fauna indicate that distinct associations can be identified as a function conductivity. Three distinguished: (1) springs, ponds small creeks, characterized by low conductivity (e. g. 1015 ms cm(-1)); (2) lakes permanent ponds, medium 1625 cm(-1)) (3) ephemeral environments, generally higher 16 480 These were also older sequences sediments outcropping current shoreline, well sediment cores Cardiel. The predominance Limnocythere rionegroensis Cusminsky & Whatley sections suggests development saline turbid lake during Late Pleistocene Early Holocene, thus precipitation at these latitudes. Changes abundance have been observed last approximately 000 calibrated years BP. Conductivity is known to change ratio evaporation decrease Middle Holocene substantial hydrological variations (i. e. increase precipitation/ minor conductivity). examples show provide an excellent proxy for interpreting palaeoclimatic palaeoenvironmental changes (C) 2011 Linnean Society London, Biological Journal Society, 2011, 103, 397-408. (Less)