Isotopic records (δ18O, δ13C) obtained on bulk carbonates as well as diatom data exhibit several shifts reflecting variations both in terrestrial and limnic environment. Distinct negative excursion of δ18O curve recorded during the first half of the GI-1 event suggests intensive groundwater discharge accompanied by active transportation of detrital carbon in to the basin. Limited basin productivity is also indicated by lithological and diatom records. Since approximately 13,700 cal BP, sedimentation regime in the lake stabilised and productivity of the basin started to increase in positive correlation with LOI data. A considerable decrease in δ18O values punctuated by a rapid jump in the middle of the interval was recorded during the GS-1 Stadial and could be associated with the deterioration of the environmental regime and degradation of the soil layer, increasing erosion activity alongside the rising input of detrital carbonates into the basin. The water table was low, as indicated by diatom data. Recovery of the environmental regime preceded the GS-1/Holocene boundary, as is seen in lithostratigraphical and isotopic data. During the early Holocene, stable isotopes show several episodes with altered levels suggesting instability of the environmental regime, most probably related with the global climatic alterations.