Strong shrub expansion in tundra-taiga, tree infilling in taiga and stable tundra in central Chukotka (north-eastern Siberia) between 2000 and 2017

Shevtsova, Iuliia; Heim, Birgit; Kruse, Stefan; Schröder, Julius; Troeva, Elena; Pestryakova, Ludmila A; Zakharov, Evgeniy S.; Herzschuh, Ulrike

doi:10.1088/1748-9326/ab9059

Cited by 39 publications

(31 citation statements)

References 48 publications

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“…This is supported by low pollen concentrations recorded within the Lake Ilirney pollen record and the persistence of Poaceae and Artemisia during the late glacial that signifies persistently cold conditions and low catchment pollen productivity (Andreev et al, 2021). Based on the similarities between the lakes and their catchments, their proximity, and a lack of macrophytes at both sites, a similar interpretation can be postulated for Lake Rauchuagytgyn (Sifeddine et al, 2011). Higher and more variable Mn/Fe ratio values throughout much of LU-II point towards increased oxygen at the sediment-water interface that could have enhanced degradation of organic matter Fritz et al, 2018).…”

Section: Results Of Principal Component Analysismentioning

confidence: 74%

Sediment and carbon accumulation in a glacial lake in Chukotka (Arctic Siberia) during the Late Pleistocene and Holocene: combining hydroacoustic profiling and down-core analyses

et al. 2021

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Abstract. Lakes act as important sinks for inorganic and organic sediment components. However, investigations of sedimentary carbon budgets within glacial lakes are currently absent from Arctic Siberia. The aim of this paper is to provide the first reconstruction of accumulation rates, sediment and carbon budgets from a lacustrine sediment core from Lake Rauchuagytgyn, Chukotka (Arctic Siberia). We combined multiple sediment biogeochemical and sedimentological parameters from a radiocarbon-dated 6.5 m sediment core with lake basin hydroacoustic data to derive sediment stratigraphy, sediment volumes and infill budgets. Our results distinguished three principal sediment and carbon accumulation regimes that could be identified across all measured environmental proxies including early Marine Isotope Stage 2 (MIS2) (ca. 29–23.4 ka cal BP), mid-MIS2–early MIS1 (ca. 23.4–11.69 ka cal BP) and the Holocene (ca. 11.69–present). Estimated organic carbon accumulation rates (OCARs) were higher within Holocene sediments (average 3.53 g OC m−2 a−1) than Pleistocene sediments (average 1.08 g OC m−2 a−1) and are similar to those calculated for boreal lakes from Quebec and Finland and Lake Baikal but significantly lower than Siberian thermokarst lakes and Alberta glacial lakes. Using a bootstrapping approach, we estimated the total organic carbon pool to be 0.26 ± 0.02 Mt and a total sediment pool of 25.7 ± 1.71 Mt within a hydroacoustically derived sediment volume of ca. 32 990 557 m3. The total organic carbon pool is substantially smaller than Alaskan yedoma, thermokarst lake sediments and Alberta glacial lakes but shares similarities with Finnish boreal lakes. Temporal variability in sediment and carbon accumulation dynamics at Lake Rauchuagytgyn is controlled predominantly by palaeoclimate variation that regulates lake ice-cover dynamics and catchment glacial, fluvial and permafrost processes through time. These processes, in turn, affect catchment and within-lake primary productivity as well as catchment soil development. Spatial differences compared to other lake systems at a trans-regional scale likely relate to the high-latitude, mountainous location of Lake Rauchuagytgyn.

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Section: Results Of Principal Component Analysismentioning

confidence: 74%

Sediment and carbon accumulation in a glacial lake in Chukotka (Arctic Siberia) during the Late Pleistocene and Holocene: combining hydroacoustic profiling and down-core analyses

et al. 2021

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“…The GIMMS-3g+ and MODIS records both indicate that MaxNDVI has increased across most of the circumpolar Arctic during 1982and 2000. Although the two datasets consider different periods, several Arctic regions stand out as change "hotspots" in both records.…”

Section: S298mentioning

confidence: 99%

The Arctic

Moon¹,

Tedesco²,

Mankoff³

et al. 2021

Bulletin of the American Meteorological Society

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“…are dominated by Dryas octopetala and lichens, accompanied by herbs from the Fabaceae, Orobanchaceae, Poaceae, Rosaceae, and Saxifragaceae. The vegetation at higher elevations becomes barren (Shevtsova et al 2020).…”

Section: Methodsmentioning

confidence: 99%

Plant sedimentary ancient DNA from Far East Russia covering the last 28 ka reveals different assembly rules in cold and warm climates

Huang

Stoof‐Leichsenring

et al. 2020

Preprint

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Woody plants are expanding into the Arctic under a warming climate. The related impact on plant diversity is not well understood because we have only limited knowledge about plant assembly rules and because of a lack of time-series of plant diversity. Here, we applied sedimentary ancient DNA metabarcoding using the plant-specific g and h primers of the trnL gene to a sediment record from Lake Ilirney (central Chukotka Far Eastern Russia) covering the last 28 thousand years. Our results show that forb-dominated steppe-tundra and Saliceae-rich dwarf-shrub tundra communities dominated during the cold climate before 14 ka, while deciduous erect-shrub tundra was abundant during the warm period between 14 and 0 ka. Larix invasion during the late Holocene substantially lagged behind the period of densest vegetation and likely warmest period between 10 and 6 ka. Overall, we discovered the highest richness during 28–23 ka and a second richness peak during 13–10 ka: both periods are characterised by low shrub abundance. The richest communities during the cold pre-14 ka period were phylogenetically clustered, which probably originates from environmental filtering along with niche differentiation under limited resources. In contrast, the richest post-14 ka community was phylogenetically overdispersed, likely originating from an erratic recruitment process in the course of warming. Despite differences in timescale, some of our evidence can be relevant to arctic plant diversity changes. By analogy to the past, we expect a lagged response of tree invasion. In the long-term, ongoing expansion of deciduous shrubs will eventually result in a phylogenetically more diverse community but will also cause reduced plant taxonomic richness; however, richness may overshoot in the short-term.

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Strong shrub expansion in tundra-taiga, tree infilling in taiga and stable tundra in central Chukotka (north-eastern Siberia) between 2000 and 2017

Cited by 39 publications

References 48 publications

Sediment and carbon accumulation in a glacial lake in Chukotka (Arctic Siberia) during the Late Pleistocene and Holocene: combining hydroacoustic profiling and down-core analyses

Sediment and carbon accumulation in a glacial lake in Chukotka (Arctic Siberia) during the Late Pleistocene and Holocene: combining hydroacoustic profiling and down-core analyses

The Arctic

Plant sedimentary ancient DNA from Far East Russia covering the last 28 ka reveals different assembly rules in cold and warm climates

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