Paleoecological Changes in Siberian Lake Systems

Siberian lakes provide unparalleled archives of past environmental change, recording interactions among climate, vegetation and permafrost over the last 20 000 years. During the Last Glacial Maximum, extensive steppe–tundra landscapes surrounded deep basins, and pollen assemblages indicate a predominantly open environment punctuated by sparse boreal trees in local refugia. A well-dated succession of sediment cores reveals the Younger Dryas stadial as a brief return to colder, drier conditions, after which the onset of the Holocene saw rapid warming, permafrost thaw and northward migration of taiga communities. Multiproxy analyses—combining palynology, diatom records, carbon mass accumulation rates and geochemical biomarkers—have illuminated shifts in primary productivity, seasonality and carbon burial. Notably, early Holocene meltwater pulses enhanced nutrient fluxes and stimulated diatom blooms, while Late Holocene cooling and expanding peatlands modulated organic carbon sequestration. These palaeoecological reconstructions underscore the sensitivity of high-latitude freshwater systems to abrupt and gradual climate forcings, with direct relevance to forecasting the response of boreal landscapes to ongoing warming, permafrost degradation and hydrological change.

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Technical terms

Palaeolimnology: The study of ancient lakes and their sediments to reconstruct past environmental and climatic conditions.

Palynology: The analysis of pollen and spores in sedimentary records to infer past vegetation and climate.

Diatoms: Microscopic siliceous algae whose preserved frustules in sediments serve as indicators of past water chemistry and productivity.

Permafrost: Ground that remains at or below 0 °C for at least two consecutive years, influencing hydrology and carbon storage.

Carbon mass accumulation rate (CMAR): The rate at which organic carbon is deposited in sediments, expressed in grams per square metre per year (g C m⁻² yr⁻¹).

Last Glacial Maximum (LGM): The period, around 21 000 years ago, when global ice volumes and sea levels were at their maximum during the last glacial cycle.

References

1. Late Glacial and Holocene changes in vegetation cover and climate in southern Siberia derived from a 15 kyr long pollen record from Lake Kotokel. Climate of the Past (2009).
2. Long-term trends in diatom diversity and palaeoproductivity: a 16 000-year multidecadal record from Lake Baikal, southern Siberia. Climate of the Past (2022).
3. Not herbs and forbs alone: pollen‐based evidence for the presence of boreal trees and shrubs in Cis‐Baikal (Eastern Siberia) derived from the Last Glacial Maximum sediment of Lake Ochaul. Journal of Quaternary Science (2021).