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Lake‐level reconstructions are a key tool in hydro‐climate reconstructions, based on the assumption that lake‐level changes primarily reflect climatic changes. Although it is known that land cover changes can affect evapotranspiration and groundwater formation, this factor commonly receives little attention in the interpretation of past lake‐level changes. To address this issue in more detail, we explore the effects of land cover change on Holocene lake‐level fluctuations in Lake Tiefer See in the lowlands of northeastern Germany. We reconstruct lake‐level changes based on the analysis of 28 sediment records from different water depths and from the shore. We compare the results with land cover changes inferred from pollen data. We also apply hydrological modelling to quantify effects of land cover change on evapotranspiration and the lake level. Our reconstruction shows an overall lake‐level amplitude of about 10 m during the Holocene, with the highest fluctuations during the Early and Late Holocene. Only smaller fluctuations during the Middle Holocene can unambiguously be attributed to climatic fluctuations because the land cover was stable during that period. Fluctuations during the Early and Late Holocene are at least partly related to changes in natural and anthropogenic land cover. For several intervals the reconstructed lake‐level changes agree well with variations in modelled groundwater recharge inferred from land cover changes. In general, the observed amplitudes of lake‐level fluctuations are larger than expected from climatic changes alone and thus underline that land cover changes in lake catchments must be considered in climatic interpretations of past lake‐level fluctuations.
Abstract
The Tollense valley in northeast Germany is well known for its substantial evidence indicating a violent conflict dated to the early 13th century BC (Period III of the Nordic Bronze Age). This article presents a significant new find from a later Bronze Age context, found in the river at a known Bronze Age valley crossing (site Weltzin 13) by Ronald Borgwardt in 2020. The small bronze figurine (14.7 cm tall) has an egg-shaped head with a prominent nose, looped arms, a neckring, two knobs signifying breasts, a belt, an indication of a female sex and two slightly differently shaped legs. In the 19th century a similar female statuette was found near the village of Klein Zastrow, just a few kilometres from the valley crossing, but mostly these figurines are known from Zealand and Scania. Belts are only present on the statuettes from Zealand and northern Germany, and their presence suggests a close connection between the figures from these areas. Typological evidence places the figure from the Tollense river to the Late Bronze Age (Periods V–VI). Some time ago the figures were discussed as possible balance weights, but their small number does not support this theory. With a mass of 155 g, however, the new figure could be seen as a multiple of 26 g, the previously proposed weight unit of the time. The new find further suggests a connection between the find spots of the statuettes and routes of communication. There is little evidence to support an interpretation as a goddess. The deposition of the new figure at a valley crossing where hundreds of years before a violent conflict happened, might indicate that this was still a place of commemoration.