Records of the 8200calBP cold event reflected in the composition of subfossil Cladocera in the sediments of three lakes in Poland

摘要: Abstract The 8200 cal BP cold event was documented by analyzing cladoceran subfossil remains in sediments of three Polish lakes. To date, this has primarily been identified areas located at higher latitudes the Northern Hemisphere. It mainly confirmed results oxygen and carbon stable isotope analyses. This survey represents an attempt to find traces lake sediments, based on changes species composition frequency individuals. Both archival, accurately dated (Lake Ostrowite, Lake Gościąz), recently cored samples Charzykowskie) were used. analysis cladocerans performed a high resolution. allowed derivation detailed conclusions regarding Early Holocene within lakes, therefore short-term climate changes. In Lakes Charzykowskie, Gościąz, zooplankton Cladocera occurred same time as event. Certain disappeared completely, percentage share majority zooplankters decreased significantly. ( Camptocercus lilljeborgi , Alonopsis elongata ), that are typical lakes areas, appeared during event, although not large numbers.