Paleoenvironmental Changes in Lake Systems

Lake systems act as natural archives of past environmental and climatic fluctuations, capturing a continuum of ecological signals within their sedimentary successions. Analyses of lacustrine deposits—ranging from pollen assemblages and stable isotopes to lipid biomarkers and geochemical proxies—have elucidated the tempo and magnitude of glacial–interglacial cycles, abrupt hydrological shifts and long-term ecosystem resilience. Such records reveal that lakes respond sensitively to variations in temperature, precipitation and catchment processes, often exhibiting threshold behaviour that can lead to rapid regime changes in vegetation and biogeochemical cycles. Understanding these dynamics has global significance for water resource management, biodiversity conservation and the anticipation of future freshwater system responses to anthropogenic forcing.

Research from Nature Portfolio

Recent studies have exploited high-resolution pollen and geochemical records from Mediterranean lake drillcores to quantify how rising atmospheric CO2 modulates moisture availability in catchment systems. By applying convergent cross-mapping to sub-centennial data, researchers have identified two distinct vegetation regimes—forest and steppe—across multiple glacial–interglacial transitions. Abrupt shifts between these states occur when precipitation falls below critical thresholds, signalling that future CO2-driven reductions in moisture may precipitate rapid forest loss and encourage steppe expansion around vulnerable lakes.

Paleoenvironmental Changes in Lake Systems publication trend

The graph below shows the total number of articles in paleoenvironmental changes in lake systems across all publications each year (not limited to Nature Index journals).

Technical terms

Paleoenvironmental proxy: A measurable chemical, physical or biological parameter preserved in lake sediments that reflects past environmental conditions.

Marine Isotope Stage (MIS): Alternating warm (interglacial) and cold (glacial) periods in Earth’s past, inferred from oxygen isotope ratios in marine and lacustrine carbonates.

Pollen analysis (palynology): The examination of preserved pollen grains in sediment cores to reconstruct past vegetation communities and climate.

Tephrochronology: The use of volcanic ash layers intercalated within sediment sequences as precise, time-synchronous markers for chronological control.

Hemipelagic sediment: Fine-grained material deposited in deep lake basins, comprising a mixture of terrigenous clastic particles and biogenic remains.

References

1. Atmospheric CO2 forcing on Mediterranean biomes during the past 500 kyrs. Nature Communications (2023).
2. The expression of the MIS 12 glacial stage in Southeastern Europe and its impact over the Middle Pleistocene hominins in Megalopolis Basin (Greece). Global and Planetary Change (2024).
3. Pollen-based paleoenvironmental and paleoclimatic change at Lake Ohrid (south-eastern Europe) during the past 500 ka. Biogeosciences (2016).
4. Climate variability over the last 92 ka in SW Balkans from analysis of sediments from Lake Prespa. Climate of the Past (2014).