Holocene environmental change in southwest Turkey: a palaeoecological record of lake and catchment-related changes

Percentage, concentration and accumulation pollen data together with diatom and non-siliceous microfossil data are presented for the site of Golhisar Golu (37°8 minutes N, 29°36 minutes E; elevation 930 m), a small intramontane lake in Burdur Province, southwest Turkey. Microfossil assemblages from the longest sediment core (GHA: 813 cm) record changes in local and regional vegetation and lake productivity over the last approx. 9500 years. Pollen spectra indicate that vegetation progressed from an open landscape with an increase in arboreal pollen occurring approx. 8500 BP to mixed forest comprising oak, pine and juniper until around 3000 BP (Cal approx. 1240 BC) when a human occupation phase becomes discernible from the pollen spectra. This occurs shortly after the deposition of a volcanic tephra layer which originated from the Minoan eruption of Santorini (Thera) and radiocarbon dated to 3330 &plusmn 70 yr BP (Cal approx. 1600 BC). This human occupation phase is comparable to the Beysehir Occupation phase recorded at other sites in southwest Turkey and involved forest clearance and the cultivation of fruit trees such as Olea, Juglans, Castanea and Vitis together with arable cereal growing and pastoralism. The presence of pollen types associated with the Beysehir Occupation phase in deposits above the Santorini tephra layer confirms a Late Bronze Age/early Anatolian Dark Age date for its commencement. Since approx. 3000 BP notable changes in aquatic ecology associated with tephra deposition and subsequent nutrient and sediment flux from the lake catchment are recorded. The Beysehir Occupation phase at Golhisar Golu came to an end around 1300 BP (Cla AD approx. 700) when pine appears to have become the dominant forest tree.