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  • PANGAEA  (246)
  • Hoboken, USA  (1)
  • Molecular Diversity Preservation International  (1)
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  • 1
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    Advances in the Derivation of Northeast Siberian Forest Metrics Using High-Resolution UAV-Based Photogrammetric Point Clouds (2019)
    Molecular Diversity Preservation International
    Details
    Publication Date: 2019-06-18
    Description: Forest structure is a crucial component in the assessment of whether a forest is likely to act as a carbon sink under changing climate. Detailed 3D structural information about the tundra–taiga ecotone of Siberia is mostly missing and still underrepresented in current research due to the remoteness and restricted accessibility. Field based, high-resolution remote sensing can provide important knowledge for the understanding of vegetation properties and dynamics. In this study, we test the applicability of consumer-grade Unmanned Aerial Vehicles (UAVs) for rapid calculation of stand metrics in treeline forests. We reconstructed high-resolution photogrammetric point clouds and derived canopy height models for 10 study sites from NE Chukotka and SW Yakutia. Subsequently, we detected individual tree tops using a variable-window size local maximum filter and applied a marker-controlled watershed segmentation for the delineation of tree crowns. With this, we successfully detected 67.1% of the validation individuals. Simple linear regressions of observed and detected metrics show a better correlation (R2) and lower relative root mean square percentage error (RMSE%) for tree heights (mean R2 = 0.77, mean RMSE% = 18.46%) than for crown diameters (mean R2 = 0.46, mean RMSE% = 24.9%). The comparison between detected and observed tree height distributions revealed that our tree detection method was unable to representatively identify trees 15–20 m to capture homogeneous and representative forest stands. Additionally, we identify sources of omission and commission errors and give recommendations for their mitigation. In summary, the efficiency of the used method depends on the complexity of the forest’s stand structure.
    Electronic ISSN: 2072-4292
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Published by Molecular Diversity Preservation International
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    PAPER CURRENT
  • 2
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    Sedimentary DNA identifies modern and past macrophyte diversity and its environmental drivers in high‐latitude and high‐elevation lakes in Siberia and China (2022)
    Stoof‐Leichsenring, Kathleen R. ; Huang, Sichao ; Liu, Sisi ; [et al.]
    John Wiley & Sons, Inc. | Hoboken, USA
    Details
    Publication Date: 2022-09-22
    Description: Arctic and alpine aquatic ecosystems are changing rapidly under recent global warming, threatening water resources by diminishing trophic status and changing biotic composition. Macrophytes play a key role in the ecology of freshwaters and we need to improve our understanding of long‐term macrophytes diversity and environmental change so far limited by the sporadic presence of macrofossils in sediments. In our study, we applied metabarcoding using the trnL P6 loop marker to retrieve macrophyte richness and composition from 179 surface‐sediment samples from arctic Siberian and alpine Chinese lakes and three representative lake cores. The surface‐sediment dataset suggests that macrophyte richness and composition are mostly affected by temperature and conductivity, with highest richness when mean July temperatures are higher than 12°C and conductivity ranges between 40 and 400 μS cm−1. Compositional turnover during the Late Pleistocene/Holocene is minor in Siberian cores and characterized by a less rich, but stable emergent macrophyte community. Richness decreases during the Last Glacial Maximum and rises during wetter and warmer climate in the Late‐glacial and Mid‐Holocene. In contrast, we detect a pronounced change from emergent to submerged taxa at 14 ka in the Tibetan alpine core, which can be explained by increasing temperature and conductivity due to glacial runoff and evaporation. Our study provides evidence for the suitability of the trnL marker to recover modern and past macrophyte diversity and its applicability for the response of macrophyte diversity to lake‐hydrochemical and climate variability predicting contrasting macrophyte changes in arctic and alpine lakes under intensified warming and human impact.
    Description: Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659
    Description: National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809
    Description: Second Tibetan Plateau Scientific Expedition and Research Program
    Description: https://doi.pangaea.de/10.1594/PANGAEA.920866
    Description: https://doi.org/10.5061/dryad.k6djh9w4r
    Keywords: ddc:577.63
    Language: English
    Type: doc-type:article
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    CITATION GEO-LEO
  • 3
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    Pollen counts, AMS C14 and Pb-210/Cs-137 dating in sediment cores from three lakes along an open larch forest-forest tundra-tundra transect in the Omoloy region, north-eastern Siberia (2020)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Description: Here, we provide the raw pollen data archived in three Siberian lake sediment cores spanning the mid-Holocene to the present (7.6-0 cal ka BP), from northern typical tundra to southern open larch forest in the Omoloy region. There are three cores: 1. 14-OM-20B, Lat. / °: 70.53, Lon. / °: 132.91, Ele. / m a.s.l.: 52, Modern vegetation: open larch forest, Lake area / km2: 0.26, Maximal depth / m: 3.4 2. 14-OM-02B, Lat. / °: 70.72, Lon. / °: 132.67, Ele. / m a.s.l.: 58, Modern vegetation: forest tundra, Lake area / km2: 0.08, Maximal depth / m: 3.5 3. 14-OM-12A, Lat. / °: 70.96, Lon. / °: 132.57, Ele. / m a.s.l.: 60, Modern vegetation: tundra, Lake area / km2: 0.09, Maximal depth / m: 4.5 Three lake sediment cores, 14OM12A (33 cm long), 14OM02B (49.5 cm long) and 14OM20B (86 cm long), were recovered from three sites using a UWITEC gravity corer (6 cm internal diameter) equipped with a hammer tool in July 2014. From the three cores, 16 bulk organic carbon samples were selected because of the lack of macrofossil remains and radiocarbon dated using accelerator mass spectrometry (AMS) at Poznań radiocarbon laboratory of Adam Mickiewicz University, Poland. In addition, 30 freeze-dried samples per core at 0.25 or 0.5 cm intervals between 0 and 15 cm were analysed for 210Pb/137Cs at the Liverpool University Environmental Radioactivity Laboratory. In this project, we analyse pollen and sedaDNA (Liu et al., 2020; doi:10.5061/dryad.69p8cz900) from three lake sediment cores from the Omoloy region in north-eastern Siberia (northern Yakutia), which are currently surrounded by different vegetation types ranging from typical tundra to open larch forest. First, our aim is to compare sedaDNA with the pollen data to see whether both methods track the same pattern with respect to compositional changes and diversity changes across the northern Russian treeline zone or are complementary to each other. Second, we reconstruct the mid- to late-Holocene changes of vegetation composition along a north–south transect. Third, we use the sedaDNA data to reconstruct variations in species richness and relate this to vegetation and climate change.
    Keywords: AWI_Envi; dating; Lake Omoloy; mid-holocene; north-eastern Siberia; Polar Terrestrial Environmental Systems @ AWI; Pollen
    Type: Dataset
    Format: application/zip, 5 datasets
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    DATA PANGAEA
  • 4
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    Population genetics analyses of larch tree stands in north-central Siberia (2018)
    PANGAEA
    In:  Supplement to: Kruse, Stefan; Epp, Laura Saskia; Wieczorek, Mareike; Pestryakova, Luidmila A; Stoof-Leichsenring, Kathleen Rosmarie; Herzschuh, Ulrike (2018): High gene flow and complex treeline dynamics of Larix Mill. stands on the Taymyr Peninsula (north-central Siberia) revealed by nuclear microsatellites. Tree Genetics & Genomes, 14(2), https://doi.org/10.1007/s11295-018-1235-3
    Details
    Publication Date: 2023-03-16
    Description: Arctic treelines are facing a strong temperature increase as a result of recent global warming, causing possible changes in forest extent, which will alter vegetation-climate feedbacks. However, the mode and strength of the response is rather unclear, as potential changes are happening in areas that are very remote and difficult to access, and empirical data are still largely lacking. Here, we assessed the current population structure and genetic differentiation of Larix Mill. tree stands within the northernmost latitudinal treeline reaching ~72° N in the southern lowlands of the Taymyr Peninsula (~100° E). We sampled 743 individuals belonging to different height classes (seedlings, saplings, trees) at eleven locations along a gradient from 'single tree' tundra over 'forest line' to 'dense forest' stands and conducted investigations applying eight highly polymorphic nuclear microsatellites. Results suggest a high diversity within subpopulations (HE=0.826-0.893), coupled, however, with heterozygote deficits in all subpopulations, but pronounced in 'forest line' stands. Overall, genetic differentiation of subpopulations is low (FST=0.005), indicating a region-wide high gene flow, although 'forest line' stands harbour few rare and private alleles, likely indicating greater local reproduction. 'Single tree' stands, located beyond the northern forest line, are currently not involved in treeline expansion, but show signs of a long-term refuge, namely asexual reproduction and change of growth-form from erect to creeping growth, possibly having persisted for thousands of years. The lack of differentiation between the subpopulations points to a sufficiently high dispersal potential, and thus a rapid northward migration of the Siberian arctic treeline under recent global warming seems potentially unconstrained, but observations show it to be unexpectedly slow.
    Keywords: AWI_Envi; Polar Terrestrial Environmental Systems @ AWI
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 5
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    Population genetics analyses of larch tree stands in north-central Siberia (2018)
    PANGAEA
    Details
    Publication Date: 2023-03-16
    Keywords: AWI_Envi; Polar Terrestrial Environmental Systems @ AWI; Taymyr_peninsula
    Type: Dataset
    Format: application/zip, 659.4 MBytes
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    DATA PANGAEA
  • 6
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    Pollen, DNA and Vegetation records from surface sediments of lacustrine lakes along a forest tundra - tundra transect at the Taymyr peninsula, northern Siberia (2016)
    PANGAEA
    In:  Supplement to: Niemeyer, Bastian; Epp, Laura Saskia; Stoof-Leichsenring, Kathleen Rosmarie; Pestryakova, Luidmila A; Herzschuh, Ulrike (2017): A comparison of sedimentary DNA and pollen from lake sediments in recording vegetation composition at the Siberian treeline. Molecular Ecology Resources, 17(6), e46-e62, https://doi.org/10.1111/1755-0998.12689
    Details
    Publication Date: 2023-03-07
    Description: Reliable information of past vegetation changes are important to project future changes, especially for areas undergoing rapid transitioning such as the boreal treeline. The application of detailed sedDNA records has the potential to enhance our understanding of vegetation changes gained mainly from pollen studies of lake sediments. This study investigates sedDNA and pollen records from 31 lakes along a gradient of increasing larch forest cover in northern Siberia (Taymyr Peninsula) and compares them with vegetation field surveys within the lake's catchment. With respect to vegetation richness, sedDNA recorded 114 taxa, about half of them to species level, while pollen analyses identified 43 pollen taxa. Both approaches exceed the 31 taxa revealed by vegetation field surveys of 400 m**2 plots. From north to south, Larix percentages increase, as is consistently recorded by all three methods. Furthermore, tundra sites are separated from forested sites in the plots of the principal component analyses. Comparison of ordination results by Procrustes and Protest analyses yields a significant fit among all compared pairs of records. Despite the overall comparability of sedDNA and pollen analyses certain idiosyncrasies in the compositional signal are observed, such as high percentages of Alnus and Betula in all pollen spectra and high percentages of Salix in all sedDNA spectra. In conclusion, our results from the treeline show that sedDNA analyses perform better than pollen in recording site-specific richness (i.e. presence/absence of certain vegetation taxa in the direct vicinity of the lake) and perform as good as pollen in tracing regional vegetation composition.
    Keywords: AWI_PerDyn; Permafrost Research (Periglacial Dynamics) @ AWI
    Type: Dataset
    Format: application/zip, 3 datasets
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    DATA PANGAEA
  • 7
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    Pollen spectra and relative pollen productivity estimates for common taxa of the northern Siberian Arctic (2015)
    PANGAEA
    In:  Supplement to: Niemeyer, Bastian; Klemm, Juliane; Pestryakova, Luidmila A; Herzschuh, Ulrike (2015): Relative pollen productivity estimates for common taxa of the northern Siberian Arctic. Review of Palaeobotany and Palynology, 221, 71-82, https://doi.org/10.1016/j.revpalbo.2015.06.008
    Details
    Publication Date: 2023-03-07
    Description: Pollen productivity estimates (PPE) are used to quantitatively reconstruct variations in vegetation within a specific distance of the sampled pollen archive. Here, for the first time, PPEs from Siberia are presented. The study area (Khatanga region, Krasnoyarsk territory, Russia) is located in the Siberian Sub-arctic where Larixis the sole forest-line forming tree taxon. Pollen spectra from two different sedimentary environments, namely terrestrial mosses (n=16) and lakes (n=15, median radius ~100 m) and their surrounding vegetation were investigated to extract PPEs. Our results indicate some differences in pollen spectra between moss and lake pollen. Larix and Cyperaceae for example obtained higher representation in the lacustrine than in terrestrial moss samples. This highlights that in calibration studies modern and fossil dataset should be of similar sedimentary origin. The results of the Extended R-Value model were applied to assess the relevant source area of pollen (RSAP) and to calculate the PPEs for both datasets. As expected, the RSAP of the moss samples was very small (about 10 m) compared to the lacustrine samples (about 25 km). Calculation of PPEs for the six most common taxa yielded generally similar results for both datasets. Relative to Poaceae (reference taxon, PPE=1) Betula nana-type (PPEmoss: 1.8, PPElake: 1.8) and Alnusfruticosa-type (PPEmoss: 6.4, PPElake: 2.9) were overrepresented while Cyperaceae (PPEmoss: 0.5, PPElake: 0.1), Ericaceae (PPEmoss: 0.3, PPElake 〈0.01), Salix (PPEmoss: 0.03, PPElake 〈0.01) and Larix (PPEmoss 〈0.01, PPElake: 0.2) were under-represented in the pollen spectra compared to the vegetation in the RSAP. The estimation for the dominant tree in the region, Larixgmelinii, is the first published result for this species, but need to be considered very preliminary. The inferred sequence from over- to under-representation is mostly consistent with results from Europe; however, still the absolute values show some differences. Gathering vegetation data was limited by flowering season and low resolute satellite imagery and accessibility of the remote location of our study area. Therefore, our estimate may serve as first reference to strengthen future vegetation reconstructions in this climate-sensitive region.
    Keywords: AWI_PerDyn; Permafrost Research (Periglacial Dynamics) @ AWI
    Type: Dataset
    Format: application/zip, 2 datasets
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    DATA PANGAEA
  • 8
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    (Table 2) Results of the radiocarbon dating of bulk sediment from lake 11-CH-17 (2015)
    PANGAEA
    Details
    Publication Date: 2023-03-07
    Keywords: 11-CH-17A; Age; Age, 14C AMS; Age, 14C calibrated; Age, dated; Age, dated material; Age, dated standard deviation; Age, standard deviation; AWI_PerDyn; AWI Arctic Land Expedition; Calculated; Chatanga2011; DEPTH, sediment/rock; GCUWI; Gravity corer, UWITEC; Permafrost Research (Periglacial Dynamics) @ AWI; RU-Land_2011_Khatanga; Sample, optional label/labor no; Taymyr peninsula, northern Siberia
    Type: Dataset
    Format: text/tab-separated-values, 36 data points
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    DATA PANGAEA
  • 9
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    Pollen productivity estimates from two different sedimentary environments in the Khatanga region, Russia (2015)
    PANGAEA
    Details
    Publication Date: 2023-03-07
    Keywords: 11-CH-moss10I; 11-CH-moss16I; 11-CH-moss17I; 11-CH-moss17II; 11-CH-moss2I; 11-CH-moss2II; 11-CH-moss6I; 11-CH-moss6II; 11-CH-moss6III; 11-CH-moss6IV; 13-TY-moss4K1; 13-TY-moss4K2; 13-TY-moss7K1; 13-TY-moss7K2; 13-TY-moss9K1; 13-TY-moss9K2; AWI_PerDyn; AWI Arctic Land Expedition; Calculated; Chatanga2011; Counting, palynology; Event label; Khatanga region, Russia; LAKE; LAND; Latitude of event; Longitude of event; Permafrost Research (Periglacial Dynamics) @ AWI; Pollen productivity estimate; Ring sector, in; Ring sector, out; RU-Land_2011_Khatanga; Sample ID; Sampling/measurement on land; Sampling lake
    Type: Dataset
    Format: text/tab-separated-values, 2410 data points
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    DATA PANGAEA
  • 10
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    DNA records from surface sediments of lacustrine lakes along a forest tundra - tundra transect at the Taymyr peninsula, northern Siberia (2016)
    PANGAEA
    Details
    Publication Date: 2023-03-07
    Keywords: AWI_PerDyn; AWI Arctic Land Expedition; MULT; Multiple investigations; Permafrost Research (Periglacial Dynamics) @ AWI; RU-Land_2013_Taymyr; Taymyr_peninsula_2013; Taymyr2013; Taymyr peninsula, northern Siberia
    Type: Dataset
    Format: application/zip, 66.5 kBytes
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    DATA PANGAEA
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