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Bigler, Christian
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Publications (10 of 56) Show all publications
Finsinger, W., Bigler, C., Schworer, C. & Tinner, W. (2024). Rates of palaeoecological change can inform ecosystem restoration. Biogeosciences, 21(7), 1629-1638
Open this publication in new window or tab >>Rates of palaeoecological change can inform ecosystem restoration
2024 (English)In: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 21, no 7, p. 1629-1638Article in journal (Refereed) Published
Abstract [en]

Accelerations of ecosystem transformation raise concerns, to the extent that high rates of ecological change may be regarded amongst the most important ongoing imbalances in the Earth system. Here, we used high-resolution pollen and diatom assemblages and associated ecological indicators (the sum of tree and shrub pollen and diatom-inferred total phosphorus concentrations as proxies for tree cover and lake-water eutrophication, respectively) spanning the past 150 years to emphasize that rate-of-change records based on compositional data may document transformations having substantially different causes and outcomes. To characterize rates of change also in terms of other key ecosystem features, we quantified for both ecological indicators: (i) the percentage of change per unit time, (ii) the percentage of change relative to a reference level, and (iii) the rate of percentage change per unit time relative to a reference period, taking into account the irregular spacing of palaeoecological data. These measures document how quickly specific facets of nature changed, their trajectory, as well as their status in terms of palaeoecological indicators. Ultimately, some past accelerations of community transformation may document the potential of ecosystems to rapidly recover important ecological attributes and functions. In this context, insights from palaeoecological records may be useful to accelerate ecosystem restoration.

Place, publisher, year, edition, pages
Copernicus Publications, 2024
National Category
Ecology Geology
Identifiers
urn:nbn:se:umu:diva-223644 (URN)10.5194/bg-21-1629-2024 (DOI)001196399800001 ()2-s2.0-85189873577 (Scopus ID)
Available from: 2024-04-23 Created: 2024-04-23 Last updated: 2024-04-23Bibliographically approved
Lidman, J., Olid, C., Bigler, C. & Berglund, Å. M. M. (2023). Effect of past century mining activities on sediment properties and toxicity to freshwater organisms in northern Sweden. Science of the Total Environment, 872, Article ID 162097.
Open this publication in new window or tab >>Effect of past century mining activities on sediment properties and toxicity to freshwater organisms in northern Sweden
2023 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 872, article id 162097Article in journal (Refereed) Published
Abstract [en]

The release of toxic metals from local mining activities often represents a severe environmental hazard for nearby lake ecosystems. Previous studies on the impact of mining have primarily focused on single lakes, with less emphasis on spatial and temporal recovery patterns of multiple lakes within the same catchment, but with different hydrological connection and distance to the pollutant source. This knowledge gap prevents us from assessing the real environmental risk of abandoned mines and understanding ecosystem recovery. This study explores the intensity and spatial patterns of sediment contamination and the potential for ecosystem recovery in three lakes in close vicinity of a lead (Pb) and zinc (Zn) mine in Sweden that has been inoperative for >20 years. Dated (210Pb and 137Cs) sediment cores from each lake were used to reconstruct temporal patterns in trace element deposition and relate those with past mining activities. Results show that all lakes were affected by mining, indicated by increasing Pb and Zn concentrations and decreasing organic matter content, at the onset of mining. However, the extent and timing of mining impact differed between lakes, which was partly ascribed to differences in the historical use of tailings and settling ponds. Assessment of toxicity levels in sediments, based on normalized Probable Effect Concentration Quotient (PEC-Q) to organic matter content, provided more consistent results with the historical mining than conventional methods, showing a decreasing impact in lakes once the operations ceased. Still, sediment Pb concentrations were > 10 times higher than pre-mining values, evidencing the urgent need for remediation actions in the study lakes. This study highlights the importance of considering spatial heterogeneity in metal deposition, sediment organic matter content, and hydrological connectivity with tailings when risk assessments are performed in mining-impacted lakes. The use of normalized PEC-Q in toxic assessments is also recommended.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Heavy metal, Lake sediments, Mining, PEC-Q, Recovery, Toxicity
National Category
Environmental Sciences Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:umu:diva-205131 (URN)10.1016/j.scitotenv.2023.162097 (DOI)000950787000001 ()36764540 (PubMedID)2-s2.0-85147906175 (Scopus ID)
Available from: 2023-02-23 Created: 2023-02-23 Last updated: 2023-09-05Bibliographically approved
Capo, E., Giguet-Covex, C., Rouillard, A., Nota, K., Heintzman, P. D., Vuillemin, A., . . . Parducci, L. (2021). Lake sedimentary dna research on past terrestrial and aquatic biodiversity: Overview and recommendations. Quaternary, 4(1), Article ID 6.
Open this publication in new window or tab >>Lake sedimentary dna research on past terrestrial and aquatic biodiversity: Overview and recommendations
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2021 (English)In: Quaternary, E-ISSN 2571-550X, Vol. 4, no 1, article id 6Article, review/survey (Refereed) Published
Abstract [en]

The use of lake sedimentary DNA to track the long-term changes in both terrestrial and aquatic biota is a rapidly advancing field in paleoecological research. Although largely applied nowadays, knowledge gaps remain in this field and there is therefore still research to be conducted to ensure the reliability of the sedimentary DNA signal. Building on the most recent literature and seven original case studies, we synthesize the state-of-the-art analytical procedures for effective sampling, extraction, amplification, quantification and/or generation of DNA inventories from sedimentary ancient DNA (sedaDNA) via high-throughput sequencing technologies. We provide recommendations based on current knowledge and best practises.

Place, publisher, year, edition, pages
MDPI, 2021
Keywords
Biodiversity, Lake sediments, Metabarcoding, Metagenomics, Paleoecology, Paleogenetics, Paleogenomics, Paleolimnology, Sedimentary ancient DNA, Sedimentary DNA
National Category
Geochemistry
Identifiers
urn:nbn:se:umu:diva-182945 (URN)10.3390/quat4010006 (DOI)000633093700001 ()2-s2.0-85104594727 (Scopus ID)
Available from: 2021-05-11 Created: 2021-05-11 Last updated: 2024-02-13Bibliographically approved
Capo, E., Ninnes, S., Domaizon, I., Bigler, C., Wang, X.-R., Bindler, R. & Rydberg, J. (2021). Landscape setting drives the microbial eukaryotic community structure in four Swedish mountain lakes over the holocene. Microorganisms, 9(2), Article ID 355.
Open this publication in new window or tab >>Landscape setting drives the microbial eukaryotic community structure in four Swedish mountain lakes over the holocene
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2021 (English)In: Microorganisms, E-ISSN 2076-2607, Vol. 9, no 2, article id 355Article in journal (Refereed) Published
Abstract [en]

On the annual and interannual scales, lake microbial communities are known to be heavily influenced by environmental conditions both in the lake and in its terrestrial surroundings. How-ever, the influence of landscape setting and environmental change on shaping these communities over a longer (millennial) timescale is rarely studied. Here, we applied an 18S metabarcoding approach to DNA preserved in Holocene sediment records from two pairs of co‐located Swedish mountain lakes. Our data revealed that the microbial eukaryotic communities were strongly influenced by catchment characteristics rather than location. More precisely, the microbial communities from the two bedrock lakes were largely dominated by unclassified Alveolata, while the peatland lakes showed a more diverse microbial community, with Ciliophora, Chlorophyta and Chytrids among the more predominant groups. Furthermore, for the two bedrock‐dominated lakes—where the oldest DNA samples are dated to only a few hundred years after the lake formation—certain Alveolata, Chlorophytes, Stramenopiles and Rhizaria taxa were found prevalent throughout all the sediment profiles. Our work highlights the importance of species sorting due to landscape setting and the persistence of microbial eukaryotic diversity over millennial timescales in shaping modern lake microbial communities.

Place, publisher, year, edition, pages
MDPI, 2021
Keywords
18S metabarcoding, Holocene, Lakes, Microbial eukaryotes, Sedimentary DNA
National Category
Microbiology
Identifiers
urn:nbn:se:umu:diva-180793 (URN)10.3390/microorganisms9020355 (DOI)000622825300001 ()2-s2.0-85100648541 (Scopus ID)
Available from: 2021-02-25 Created: 2021-02-25 Last updated: 2024-02-13Bibliographically approved
Myrstener, E., Biester, H., Bigler, C., Lidberg, W., Meyer-Jacob, C., Rydberg, J. & Bindler, R. (2019). Environmental footprint of small-scale, historical mining and metallurgy in the Swedish boreal forest landscape: The Moshyttan blast furnace as microcosm. The Holocene, 29(4), 578-591
Open this publication in new window or tab >>Environmental footprint of small-scale, historical mining and metallurgy in the Swedish boreal forest landscape: The Moshyttan blast furnace as microcosm
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2019 (English)In: The Holocene, ISSN 0959-6836, E-ISSN 1477-0911, Vol. 29, no 4, p. 578-591Article in journal (Refereed) Published
Abstract [en]

The history of mining and smelting and the associated pollution have been documented using lake sediments for decades, but the broader ecological implications are not well studied. We analyzed sediment profiles covering the past similar to 10,000 years from three lakes associated with an iron blast furnace in central Sweden, as an example of the many small-scale furnaces with historical roots in the medieval period. With a focus on long-term lake-water quality, we analyzed multiple proxies including geochemistry, pollen and charcoal, diatom composition and inferred pH, biogenic silica (bSi), visible near-infrared spectroscopy (VNIRS)-inferred lake-water total organic carbon (LW-TOC), and VNIRS-inferred sediment chlorophyll (sed-Chl). All three lakes had stable conditions during the middle Holocene (similar to 5000 BCE to 1110 CE) typical of oligo-dystrophic lakes: pH 5.4-5.6, LW-TOC 15-18 mg L-1. The most important diatom taxa include, for example, Aulacoseira scalaris, Brachysira neoexilis, and Frustulia saxonica. From similar to 1150 CE, decreases in LW-TOC, bSi, and sed-Chl in all three lakes coincide with a suite of proxies indicating disturbance associated with local, small-scale agriculture, and the more widespread use of the landscape in the past (e.g. forest grazing, charcoal production). Most important was a decline in LW-TOC by 30-50% in the three lakes prior to the 20th century. In addition, the one lake (Fickeln) downstream of the smelter and main areas of cultivation experienced a shift in diatom composition (mainly increasing Asterionella formosa) and a 0.6 pH increase coinciding with increasing cereal pollen and signs of blast furnace activity. The pH did not change in the other two lakes in response to disturbance; however, these lakes show a slight increase (0.3-0.5 pH units) because of modern liming. LW-TOC has returned to background levels in the downstream lake and remains lower in the other two.

Place, publisher, year, edition, pages
Sage Publications, 2019
Keywords
diatoms, environmental change, geochemistry, human impacts, lake-water carbon, sediment, total organic carbon
National Category
Ecology
Identifiers
urn:nbn:se:umu:diva-158734 (URN)10.1177/0959683618824741 (DOI)000463639500004 ()2-s2.0-85061205652 (Scopus ID)
Available from: 2019-05-21 Created: 2019-05-21 Last updated: 2023-03-23Bibliographically approved
Capo, E., Rydberg, J., Tolu, J., Domaizon, I., Debroas, D., Bindler, R. & Bigler, C. (2019). How Does Environmental Inter-annual Variability Shape Aquatic Microbial Communities?: A 40-Year Annual Record of Sedimentary DNA From a Boreal Lake (Nylandssjon, Sweden). Frontiers in Ecology and Evolution, 7, Article ID 245.
Open this publication in new window or tab >>How Does Environmental Inter-annual Variability Shape Aquatic Microbial Communities?: A 40-Year Annual Record of Sedimentary DNA From a Boreal Lake (Nylandssjon, Sweden)
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2019 (English)In: Frontiers in Ecology and Evolution, E-ISSN 2296-701X, Vol. 7, article id 245Article in journal (Refereed) Published
Abstract [en]

To assess the sensitivity of lakes to anthropogenically-driven environmental changes (e.g., nutrient supply, climate change), it is necessary to first isolate the effects of between-year variability in weather conditions. This variability can strongly impact a lake's biological community especially in boreal and arctic areas where snow phenology play an important role in controlling the input of terrestrial matter to the lake. Identifying the importance of this inherent variability is difficult without time series that span at least several decades. Here, we applied a molecular approach (metabarcoding on eukaryotic 18S rRNA genes and qPCR on cyanobacterial 16S rRNA genes) to sedimentary DNA (sed-DNA) to unravel the annual variability of microbial community in 40 years' sediment record from the boreal lake Nylandssjon which preserve annually-laminated sediments. Our comparison between seasonal meteorological data, sediment inorganic geochemistry (X-ray fluorescence analyses) and organic biomarkers (pyrolysis-gas chromatography/mass spectrometry analyses), demonstrated that inter-annual variability strongly influence the sediment composition in Nylandssjon. Spring temperature, snow and ice phenology (e.g., the percentage of snow loss in spring, the timing of lake ice-off) were identified as important drivers for the inputs of terrestrial material to the lake, and were therefore also important for shaping the aquatic biological community. Main changes were detected in the late-80s/mid-90s and mid-2000s associated with increases in algal productivity, in total richness of the protistan community and in relative abundances of Chlorophyta, Dinophyceae as well as Cyanobacteria abundance. These changes could be linked to a decline in terrestrial inputs to the lake during the snow melt and run-off period, which in turn was driven by warmer winter temperatures. Even if our data shows that meteorological factors do affect the sediment composition and microbial communities, they only explain part of the variability. This is most likely a consequence of the high inter-annual variability in abiotic and biotic parameters highlighting the difficulty to draw firm conclusions concerning drivers of biological changes at an annual or sub-annual resolution even with the 40-year varved sediment record from Nylandssjon. Hence, it is necessary to have an even longer time perspective in order to reveal the full implications of climate change.

Place, publisher, year, edition, pages
Frontiers Media S.A., 2019
Keywords
varved sediment record, sedimentary DNA, protists, metabarcoding, meteorological data, inorganic geochemistry, organic proxies, paleolimnology
National Category
Physical Geography
Identifiers
urn:nbn:se:umu:diva-161823 (URN)10.3389/fevo.2019.00245 (DOI)000474916200001 ()2-s2.0-85088859861 (Scopus ID)
Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2024-02-13Bibliographically approved
Maier, D. B., Diehl, S. & Bigler, C. (2019). Interannual variation in seasonal diatom sedimentation reveals the importance of late winter processes and their timing for sediment signal formation. Limnology and Oceanography, 64(3), 1186-1199
Open this publication in new window or tab >>Interannual variation in seasonal diatom sedimentation reveals the importance of late winter processes and their timing for sediment signal formation
2019 (English)In: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590, Vol. 64, no 3, p. 1186-1199Article in journal (Refereed) Published
Abstract [en]

Disentangling the process information contained in a diatom sediment signature is crucial for reliable future predictions based on paleolimnological records. In this study, we combine limnological and paleolimnological monitoring to address the fundamental question: Which environmental information is contained in a diatom sediment signal? We compared annual diatom sequential sediment trap records with the diatom record of the annually varved lake sediment of Nylandssjon (northern Sweden) from three meteorologically different years (2012-2014). The seasonal patterns in diatom sedimentation were strikingly different in varve years 2012 and 2014 compared to varve year 2013. In 2012 and 2014, up to 70% of the annual flux occurred in a single spring month and was dominated by Cyclotella glomerata. In contrast, in 2013, peak fluxes were much lower and more annually integrated. Next, we compared the full-year diatom trap results with year round in-lake physical, chemical, and biological monitored parameters, as well as meteorological variables. Annual averages of environmental conditions did not explain the interannual variability in diatom sedimentation. Instead, the seasonality of diatom sedimentation was determined by the timing of the spring diatom bloom relative to lake over-turn in winters with warm vs. cold air temperature. With our combined limnological and paleolimnological monitoring approach, we find that an annual diatom signal can either contain primarily seasonal climate information from a short time period or be annually integrated. We synthesize our results in a novel conceptual model, which describes the response of sediment diatom signals to two distinct sequences of late-winter conditions.

Place, publisher, year, edition, pages
Association for the Science of Limnology and Oceanography, 2019
National Category
Geology Climate Research
Identifiers
urn:nbn:se:umu:diva-159614 (URN)10.1002/lno.11106 (DOI)000467593600022 ()2-s2.0-85065469146 (Scopus ID)
Available from: 2019-06-17 Created: 2019-06-17 Last updated: 2023-03-24Bibliographically approved
Zale, R., Huang, Y.-T. -., Bigler, C., Wood, J. R., Dalén, L., Wang, X.-R., . . . Klaminder, J. (2018). Growth of plants on the Late Weichselian ice-sheet during Greenland interstadial-1?. Quaternary Science Reviews, 185, 222-229
Open this publication in new window or tab >>Growth of plants on the Late Weichselian ice-sheet during Greenland interstadial-1?
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2018 (English)In: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 185, p. 222-229Article in journal (Refereed) Published
Abstract [en]

Unglaciated forelands and summits protruding from ice-sheets are commonly portrayed as areas where plants first establish at the end of glacial cycles. But is this prevailing view of ice-free refugia too simplistic? Here, we present findings suggesting that surface debris supported plant communities far beyond the rim of the Late Weichselian Ice-sheet during Greenland interstadial 1 (GI-1 or Bolling-Altered interstadial). We base our interpretations upon findings from terrigenous sediments largely resembling 'plant-trash' deposits in North America (known to form as vegetation established on stagnant ice became buried along with glacial debris during the deglaciation). In our studied deposit, we found macrofossils (N = 10) overlapping with the deglaciation period of the area (9.5-10 cal kyr BP) as well as samples (N = 2) with ages ranging between 12.9 and 13.3 cal kyr BP. The latter ages indicate growth of at least graminoids during the GI-1 interstadial when the site was near the geographic center of the degrading ice-sheet. We suggest that exposure of englacial material during GI-1 created patches of supraglacial debris capable of supporting vascular plants three millennia before deglaciation. The composition and resilience of this early plant community remain uncertain. Yet, the younger group of macrofossils, in combination with pollen and ancient DNA analyses of inclusions, imply that shrubs (Salix sp., Betula sp. and Ericaceae sp) and even tree species (Larix) were present in the debris during the final deglaciation stage. 

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Holocene, Pleistocene, Glaciology, Paleolimnology, Scandinavia, Vegetation dynamics, MIS-3
National Category
Geology Physical Geography
Identifiers
urn:nbn:se:umu:diva-148634 (URN)10.1016/j.quascirev.2018.02.005 (DOI)000428830400015 ()2-s2.0-85042352763 (Scopus ID)
Funder
Knut and Alice Wallenberg FoundationCarl Tryggers foundation
Available from: 2018-06-26 Created: 2018-06-26 Last updated: 2023-03-24Bibliographically approved
Adolf, C., Wunderle, S., Colombaroli, D., Weber, H., Gobet, E., Heiri, O., . . . Tinner, W. (2018). The sedimentary and remote-sensing reflection of biomass burning in Europe. Global Ecology and Biogeography, 27(2), 199-212
Open this publication in new window or tab >>The sedimentary and remote-sensing reflection of biomass burning in Europe
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2018 (English)In: Global Ecology and Biogeography, ISSN 1466-822X, E-ISSN 1466-8238, Vol. 27, no 2, p. 199-212Article in journal (Refereed) Published
Abstract [en]

Aim: We provide the first European-scale geospatial training set relating the charcoal signal in surface lake sediments to fire parameters (number, intensity and area) recorded by satellite moderate resolution imaging spectroradiometer (MODIS) sensors. Our calibration is intended for quantitative reconstructions of key fire-regime parameters by using sediment sequences of microscopic (MIC from pollen slides, particles 10-500 mu m) and macroscopic charcoal (MAC from sieves, particles > 100 mu m). Location: North-south and east-west transects across Europe, covering the mediterranean, temperate, alpine, boreal and steppe biomes. Time period: Lake sediments and MODIS active fire and burned area products were collected for the years 2012-2015. Methods: Cylinder sediment traps were installed in lakes to annually collect charcoal particles in sediments. We quantitatively assessed the relationships between MIC and MAC influx (particles/cm(2)/year) and the MODIS-derived products to identify source areas of charcoal and the extent to which lake-sediment charcoal is linked to fire parameters across the continent. Results: Source area of sedimentary charcoal was estimated to a 40-km radius around sites for both MIC and MAC particles. Fires occurred in grasslands and in forests, with grass morphotypes of MAC accurately reflecting the burned fuel-type. Despite the lack of local fires around the sites, MAC influx levels reached those reported for local fires. Both MIC and MAC showed strong and highly significant relationships with the MODIS-derived fire parameters, as well as with climatic variation along a latitudinal temperature gradient. Main conclusions: MIC and MAC are suited to quantitatively reconstructing fire number and fire intensity on a regional scale. However, burned area may only be estimated using MAC. Local fires may be identified by using several lines of evidence, e.g. analysis of large particles (> 600 mu m), magnetic susceptibility and sedimentological data. Our results offer new insights and applications to quantitatively reconstruct fires and to interpret available sedimentary charcoal records.

Place, publisher, year, edition, pages
WILEY, 2018
Keywords
calibration in space, fire ecology, fire regime, lake-sediment charcoal, MODIS, palaeoecology
National Category
Forest Science
Identifiers
urn:nbn:se:umu:diva-144332 (URN)10.1111/geb.12682 (DOI)000422750700004 ()2-s2.0-85040773210 (Scopus ID)
Available from: 2018-02-08 Created: 2018-02-08 Last updated: 2023-03-24Bibliographically approved
Maier, D. B., Gälman, V., Renberg, I. & Bigler, C. (2018). Using a decadal diatom sediment trap record to unravel seasonal processes important for the formation of the sedimentary diatom signal. Journal of Paleolimnology, 60(2), 133-152
Open this publication in new window or tab >>Using a decadal diatom sediment trap record to unravel seasonal processes important for the formation of the sedimentary diatom signal
2018 (English)In: Journal of Paleolimnology, ISSN 0921-2728, E-ISSN 1573-0417, Vol. 60, no 2, p. 133-152Article in journal (Refereed) Published
Abstract [en]

Sediment trap studies and high frequency monitoring are of great importance to develop a deeper understanding of how seasonal environmental processes are imprinted in sediment signal formation. We collected whole year diatom assemblages from 2002 to 2014 with a sequential sediment trap from a varved boreal lake (Nylandssjon, Sweden) together with environmental and limnological parameters, and compared them with the corresponding diatom record of the annual laminated sediment. Our data set indicates a large year-to-year variability of diatom succession and abundance patterns, which is well reflected in the varved sediments. Specifically, Cyclotella glomerata dominated the annual sediment trap record (as well as in the corresponding sediment varves) in years with warmer air temperatures in March/April, and Asterionella formosa dominated the annual sediment assemblages as a consequence of years characterized by higher runoff before lake over-turn. Years succeeding forest clearance in the lake catchment showed marked increase in diatom and sediment flux. The DCA scores of the yearly diatom trap assemblages clearly resemble the lake's thermal structure, which indicates that the relative abundance of major taxa seems primarily controlled by the timing of seasonal environmental events, such as above-average winter air temperature and/or autumn runoff and the current thermal structure of the lake. The high seasonal variability between environmental drivers in combination with the physical limnology leaves us with several possible scenarios leading to either an A. formosa versus C. glomerata dominated annual diatom sediment signal. With this study we highlight that short-term environmental events and seasonal limnological conditions are of major importance for interpreting annual sediment signals.

Place, publisher, year, edition, pages
Springer, 2018
Keywords
Annual diatom flux, Sequential sediment trap, Varved lake sediments, Seasonal air temperature, Discharge, Catchment
National Category
Geology Ecology
Identifiers
urn:nbn:se:umu:diva-150660 (URN)10.1007/s10933-018-0020-5 (DOI)000437128400003 ()2-s2.0-85042094692 (Scopus ID)
Available from: 2018-08-28 Created: 2018-08-28 Last updated: 2020-02-03Bibliographically approved
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