RESPONSE OF CLADOCERA (CRUSTACEA)TO NEOLITHIC SETTLEMENT AT OSLONKI(KUJAWY REGION, CENTRAL POLAND)

摘要

Analysis of cladoceran remains was done on two cores from fossil lakes located near the Neo-lithic settlement site at Oslonki (Kujawy region, Poland). The cores provide records started from the AllerOd andthe Younger Dryas, respectively. The cladoceran remains were used to reconstruct natural and anthropogeniceutrophication and changes in water ecosystems. Both water bodies were shallow and clear-water lakes during theLate Glacial period. Since the beginning of the Holocene, climatic and biotic changes induced natural, slow andgradual eutrophication. The evidence of intensive eutrophication started with the first occurrences the pollen andspores of crops and weeds. Human settlement caused significant changes in cladoceran species composition. Thefirst occurrence of crop pollen was coincident with decline of plant-associated species and increase of euplank-tonic taxa tolerant to high nutrient concentration.